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534 lines
25 KiB
534 lines
25 KiB
//TemplateEngine.java
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//-------------------------------------
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//(C) by Michael Peter Christen; mc@yacy.net
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2004
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//last major change: 16.01.2005
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//$LastChangedDate$
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//$LastChangedRevision$
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//$LastChangedBy$
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//extended for multi- and alternatives-templates by Alexander Schier
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notice above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package net.yacy.server.http;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.PushbackInputStream;
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import java.nio.charset.StandardCharsets;
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import net.yacy.cora.document.encoding.ASCII;
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import net.yacy.cora.document.encoding.UTF8;
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import net.yacy.cora.util.ByteBuffer;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.kelondro.util.FileUtils;
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import net.yacy.server.serverObjects;
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/**
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* A template engine, which substitutes patterns in strings<br>
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*
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* The template engine supports four types of templates:<br>
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* <ol>
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* <li>Normal templates: the template will be replaced by a string.</li>
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* <li>Multi templates: the template will be used more than one time.<br>
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* i.e. for lists</li>
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* <li>3. Alternatives: the program chooses one of multiple alternatives.</li>
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* <li>Includes: another file with templates will be included.</li>
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* </ol>
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*
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* All these templates can be used recursivly.<p>
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* <b>HTML-Example</b><br>
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* <pre>
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* <html><head></head><body>
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* #{times}#
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* Good #(daytime)#morning::evening#(/daytime)#, #[name]#!(#[num]#. Greeting)<br>
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* #{/times}#
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* </body></html>
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* </pre>
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* <p>
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* The corresponding HashMap to use this Template:<br>
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* <b>Java Example</b><br>
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* <pre>
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* HashMap pattern;
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* pattern.put("times", 10); //10 greetings
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* for(int i=0;i<=9;i++){
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* pattern.put("times_"+i+"_daytime", 1); //index: 1, second Entry, evening
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* pattern.put("times_"+i+"_name", "John Connor");
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* pattern.put("times_"+i+"_num", (i+1));
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* }
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* </pre>
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* <p>
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* <b>Recursion</b><br>
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* If you use recursive templates, the templates will be used from
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* the external to the internal templates.
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* In our Example, the Template in #{times}##{/times}# will be repeated ten times.<br>
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* Then the inner Templates will be applied.
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* <p>
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* The inner templates have a prefix, so they may have the same name as a template on another level,
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* or templates which are in another recursive template.<br>
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* <b>The Prefixes:</b>
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* <ul>
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* <li>Multi templates: multitemplatename_index_</li>
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* <li>Alterantives: alternativename_</li>
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* </ul>
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* So the Names in the HashMap are:
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* <ul>
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* <li>Multi templates: multitemplatename_index_templatename</li>
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* <li>Alterantives: alternativename_templatename</li>
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* </ul>
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* <i>#(alternative)#::#{repeat}##[test]##{/repeat}##(/alternative)#</i><br>
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* would be adressed as "alternative_repeat_"+number+"_test"
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*/
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public final class TemplateEngine {
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private final static byte hashChar = (byte)'#';
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private final static byte[] slashChar = {(byte)'/'};
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private final static byte pcChar = (byte)'%';
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private final static byte[] dpdpa = "::".getBytes();
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private final static byte lbr = (byte)'[';
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private final static byte rbr = (byte)']';
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//private final static byte[] pOpen = {hashChar, lbr};
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private final static byte[] pClose = {rbr, hashChar};
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private final static byte lcbr = (byte)'{';
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private final static byte rcbr = (byte)'}';
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private final static byte[] mOpen = {hashChar, lcbr};
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private final static byte[] mClose = {rcbr, hashChar};
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private final static byte lrbr = (byte)'(';
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private final static byte rrbr = (byte)')';
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private final static byte[] aOpen = {hashChar, lrbr};
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private final static byte[] aClose = {rrbr, hashChar};
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//private final static byte[] iOpen = {hashChar, pcChar};
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private final static byte[] iClose = {pcChar, hashChar};
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private final static byte[] ul = "_".getBytes();
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private final static byte[] alternative_which = " type=\"alternative\" which=\"".getBytes();
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private final static byte[] multi_num = " type=\"multi\" num=\"".getBytes();
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private final static byte[] open_endtag = "</".getBytes();
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private final static byte[] close_quotetagn = "\">\n".getBytes();
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private final static byte[] close_tagn = ">\n".getBytes();
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private final static byte[] PP = "%%".getBytes();
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private final static byte[] hash_brackopen_slash = "#(/".getBytes();
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private final static byte[] brackclose_hash = ")#".getBytes();
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private final static byte[] UNRESOLVED_PATTERN = "-UNRESOLVED_PATTERN-".getBytes();
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/**
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* transfer until a specified pattern is found; everything but the pattern is transfered so far
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* the function returns true, if the pattern is found
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*/
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private final static boolean transferUntil(final PushbackInputStream i, final OutputStream o, final byte[] pattern) throws IOException {
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int b, bb;
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boolean equal;
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while ((b = i.read()) > 0) {
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if ((b & 0xFF) == pattern[0]) {
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// read the whole pattern
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equal = true;
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lo: for (int n = 1; n < pattern.length; n++) {
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if (((bb = i.read()) & 0xFF) != pattern[n]) {
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// push back all
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i.unread(bb);
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equal = false;
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for (int nn = n - 1; nn > 0; nn--) i.unread(pattern[nn]);
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break lo;
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}
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}
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if (equal) return true;
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}
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o.write(b);
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}
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return false;
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}
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private final static boolean transferUntil(final PushbackInputStream i, final OutputStream o, final byte p) throws IOException {
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int b;
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while ((b = i.read()) > 0) {
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if ((b & 0xFF) == p) return true;
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o.write(b);
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}
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return false;
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}
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public final static void writeTemplate(final String servletname, final InputStream in, final OutputStream out, final serverObjects pattern) throws IOException {
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if (pattern == null) {
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FileUtils.copy(in, out);
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} else {
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writeTemplate(servletname, in, out, pattern, new byte[0]);
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}
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}
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/**
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* Reads a input stream, and writes the data with replaced templates on a output stream
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*/
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private final static byte[] writeTemplate(final String servletname, final InputStream in, final OutputStream out, final serverObjects pattern, final byte[] prefix) throws IOException {
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final PushbackInputStream pis = new PushbackInputStream(in, 100);
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final ByteArrayOutputStream keyStream = new ByteArrayOutputStream(4048);
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byte[] key;
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byte[] multi_key;
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byte[] replacement;
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int bb;
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final ByteBuffer structure = new ByteBuffer();
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final String clientbrowserlang = pattern.get("clientlanguage"); // preferred language or null (used for include files)
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while (transferUntil(pis, out, hashChar)) {
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bb = pis.read();
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keyStream.reset();
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// #{
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if ((bb & 0xFF) == lcbr) { //multi
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if (transferUntil(pis, keyStream, mClose)) { //close tag
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//multi_key = "_" + keyStream.toString(); //for _Key
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bb = pis.read();
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if ((bb & 0xFF) != 10){ //kill newline
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pis.unread(bb);
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}
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multi_key = keyStream.toByteArray(); //IMPORTANT: no prefix here
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keyStream.reset(); //reset stream
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//this needs multi_key without prefix
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if (transferUntil(pis, keyStream, appendBytes(mOpen, slashChar, multi_key, mClose))){
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bb = pis.read();
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if((bb & 0xFF) != 10){ //kill newline
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pis.unread(bb);
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}
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final byte[] text=keyStream.toByteArray(); //text between #{key}# an #{/key}#
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int num=0;
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final String patternKey = getPatternKey(prefix, multi_key);
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if(pattern.containsKey(patternKey) && !pattern.get(patternKey).isEmpty()){
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try{
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num=Integer.parseInt(pattern.get(patternKey)); // Key contains the iteration number as string
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}catch(final NumberFormatException e){
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ConcurrentLog.logException(e);
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num=0;
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}
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}
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structure.append('<')
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.append(multi_key)
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.append(multi_num)
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.append(ASCII.getBytes(Integer.toString(num)))
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.append(close_quotetagn);
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for(int i=0;i < num;i++) {
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final PushbackInputStream pis2 = new PushbackInputStream(new ByteArrayInputStream(text));
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//System.out.println("recursing with text(prefix="+ multi_key + "_" + i + "_" +"):"); //DEBUG
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//System.out.println(text);
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structure.append(writeTemplate(servletname, pis2, out, pattern, newPrefix(prefix,multi_key,i)));
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}//for
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structure.append(open_endtag).append(multi_key).append(close_tagn);
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} else {//transferUntil
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ConcurrentLog.severe("TEMPLATE", "No Close Key found for #{"+UTF8.String(multi_key)+"}#" + " in " + servletname); //prefix here?
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}
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}
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// #(
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} else if ((bb & 0xFF) == lrbr) { //alternative
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int others=0;
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final ByteBuffer text = new ByteBuffer();
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transferUntil(pis, keyStream, aClose);
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key = keyStream.toByteArray(); //Caution: Key does not contain prefix
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keyStream.reset(); //clear
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boolean byName=false;
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int whichPattern=0;
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byte[] patternName = new byte[0];
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final String patternKey = getPatternKey(prefix, key);
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final String patternId = pattern.get(patternKey);
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// lazy parsing of pattern value; numeric values, "true", "false" and no value allowed
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if (patternId == null) {
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whichPattern = 0;
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} else {
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if ("true".equals(patternId)) {
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whichPattern = 1;
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} else if ("false".equals(patternId)) {
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whichPattern = 0;
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} else try {
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whichPattern = Integer.parseInt(patternId); //index
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} catch(final NumberFormatException e){
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whichPattern = 0;
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byName = true;
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patternName = UTF8.getBytes(patternId);
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}
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}
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int currentPattern=0;
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boolean found=false;
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keyStream.reset(); //reset stream
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PushbackInputStream pis2;
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if (byName) {
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transferUntil(pis, keyStream, appendBytes(PP, patternName, null, null));
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if(pis.available()==0){
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ConcurrentLog.severe("TEMPLATE", "Bad Key-Value pair in #()# construct: key=\"" + patternKey + "\", value=\"" + UTF8.String(patternName) + "\" in " + servletname);
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final byte[] sb = structure.getBytes();
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structure.close();
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text.close();
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return sb;
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}
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keyStream.reset();
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transferUntil(pis, keyStream, dpdpa);
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pis2 = new PushbackInputStream(new ByteArrayInputStream(keyStream.toByteArray()));
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structure.append(writeTemplate(servletname, pis2, out, pattern, newPrefix(prefix,key)));
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transferUntil(pis, keyStream, appendBytes(hash_brackopen_slash, key, brackclose_hash, null));
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if(pis.available()==0){
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ConcurrentLog.severe("TEMPLATE", "No Close Key found for #("+UTF8.String(key)+")# (by Name) in " + servletname);
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}
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} else {
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while(!found){
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bb=pis.read(); // performance problem? trace always points to this line
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if ((bb & 0xFF) == hashChar){
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bb=pis.read();
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if ((bb & 0xFF) == lrbr){
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transferUntil(pis, keyStream, aClose);
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//reached the end. output last string.
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if (java.util.Arrays.equals(keyStream.toByteArray(),appendBytes(slashChar, key, null,null))) {
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pis2 = new PushbackInputStream(new ByteArrayInputStream(text.getBytes()));
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//this maybe the wrong, but its the last
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structure.append('<').append(key).append(alternative_which).append(ASCII.getBytes(Integer.toString(whichPattern))).append(ASCII.getBytes("\" found=\"0\">\n"));
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structure.append(writeTemplate(servletname, pis2, out, pattern, newPrefix(prefix,key)));
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structure.append(open_endtag).append(key).append(close_tagn);
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found=true;
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}else if(others >0 && keyStream.toString().startsWith("/")){ //close nested
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others--;
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text.append(aOpen).append(keyStream.toByteArray()).append(brackclose_hash);
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} else { //nested
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others++;
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text.append(aOpen).append(keyStream.toByteArray()).append(brackclose_hash);
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}
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keyStream.reset(); //reset stream
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continue;
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} //is not #(
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pis.unread(bb);//is processed in next loop
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bb = (hashChar);//will be added to text this loop
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//text += "#";
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}else if ((bb & 0xFF) == ':' && others==0){//ignore :: in nested Expressions
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bb=pis.read();
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if ((bb & 0xFF) == ':'){
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if(currentPattern == whichPattern){ //found the pattern
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pis2 = new PushbackInputStream(new ByteArrayInputStream(text.getBytes()));
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structure.append('<').append(key).append(alternative_which).append(ASCII.getBytes(Integer.toString(whichPattern))).append(ASCII.getBytes("\" found=\"0\">\n"));
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structure.append(writeTemplate(servletname, pis2, out, pattern, newPrefix(prefix,key)));
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structure.append(open_endtag).append(key).append(close_tagn);
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transferUntil(pis, keyStream, appendBytes(hash_brackopen_slash, key, brackclose_hash,null));//to #(/key)#.
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found=true;
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}
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currentPattern++;
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text.clear();
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continue;
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}
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text.append(':');
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}
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if(!found){
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text.append((byte)bb);/*
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if(pis.available()==0){
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serverLog.logSevere("TEMPLATE", "No Close Key found for #("+UTF8.String(key)+")# (by Index)");
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found=true;
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}*/
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}
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}//while
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}//if(byName) (else branch)
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text.close();
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// #[
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} else if ((bb & 0xFF) == lbr) { //normal
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if (transferUntil(pis, keyStream, pClose)) {
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// pattern detected, write replacement
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key = keyStream.toByteArray();
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final String patternKey = getPatternKey(prefix, key);
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replacement = replacePattern(patternKey, pattern); //replace
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structure.append('<').append(key)
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.append(ASCII.getBytes(" type=\"normal\">\n"));
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structure.append(replacement);
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structure.append(ASCII.getBytes("</")).append(key)
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.append(close_tagn);
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FileUtils.copy(replacement, out);
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} else {
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// inconsistency, simply finalize this
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FileUtils.copy(pis, out);
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pis.close();
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final byte[] sb = structure.getBytes();
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structure.close();
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keyStream.close();
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return sb;
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}
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// #%
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} else if ((bb & 0xFF) == pcChar) { //include
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keyStream.reset(); //reset stream
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if(transferUntil(pis, keyStream, iClose)){
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byte[] filename = keyStream.toByteArray();
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//if(filename.startsWith( Character.toString((char)lbr) ) && filename.endsWith( Character.toString((char)rbr) )){ //simple pattern for filename
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if((filename[0] == lbr) && (filename[filename.length-1] == rbr)){ //simple pattern for filename
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final byte[] newFilename = new byte[filename.length-2];
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System.arraycopy(filename, 1, newFilename, 0, newFilename.length);
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final String patternkey = getPatternKey(prefix, newFilename);
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filename= replacePattern(patternkey, pattern);
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}
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if (filename.length > 0 && !java.util.Arrays.equals(filename, UNRESOLVED_PATTERN)) {
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final ByteBuffer include = new ByteBuffer();
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BufferedReader br = null;
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try{
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//br = new BufferedReader(new InputStreamReader(new FileInputStream( filename ))); //Simple Include
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br = new BufferedReader( new InputStreamReader(new FileInputStream( HTTPDFileHandler.getLocalizedFile(UTF8.String(filename), clientbrowserlang)), StandardCharsets.UTF_8) ); //YaCy (with Locales)
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//Read the Include
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String line = "";
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while ((line = br.readLine()) != null) {
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include.append(UTF8.getBytes(line)).append(ASCII.getBytes(net.yacy.server.serverCore.CRLF_STRING));
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}
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} catch (final IOException e) {
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//file not found?
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ConcurrentLog.severe("FILEHANDLER","Include Error with file " + UTF8.String(filename) + ": " + e.getMessage());
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} finally {
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if (br != null) try { br.close(); br=null; } catch (final Exception e) {}
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}
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final PushbackInputStream pis2 = new PushbackInputStream(new ByteArrayInputStream(include.getBytes()));
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structure.append(ASCII.getBytes("<fileinclude file=\"")).append(filename).append(close_tagn);
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structure.append(writeTemplate(servletname, pis2, out, pattern, new byte[0])); //clear pattern prefix for include
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structure.append(ASCII.getBytes("</fileinclude>\n"));
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include.close();
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}
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}
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// # - no special character. This is simply a '#' without meaning
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} else { //no match, but a single hash (output # + bb)
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out.write(hashChar);
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out.write(bb);
|
|
}
|
|
}
|
|
final byte[] sb = structure.getBytes();
|
|
structure.close();
|
|
return sb;
|
|
}
|
|
|
|
private final static byte[] replacePattern(final String key, final serverObjects pattern) {
|
|
byte[] replacement;
|
|
Object value;
|
|
if (pattern.containsKey(key)) {
|
|
value = pattern.get(key);
|
|
if (value instanceof byte[]) {
|
|
replacement = (byte[]) value;
|
|
} else if (value instanceof String) {
|
|
//replacement = ((String) value).getBytes();
|
|
replacement = UTF8.getBytes(((String) value));
|
|
} else {
|
|
//replacement = value.toString().getBytes();
|
|
replacement = UTF8.getBytes(value.toString());
|
|
}
|
|
} else {
|
|
replacement = UNRESOLVED_PATTERN;
|
|
}
|
|
return replacement;
|
|
}
|
|
|
|
private final static byte[] newPrefix(final byte[] oldPrefix, final byte[] key) {
|
|
final ByteBuffer newPrefix = new ByteBuffer(oldPrefix.length + key.length + 1);
|
|
newPrefix.append(oldPrefix).append(key).append(ul);
|
|
final byte[] result = newPrefix.getBytes();
|
|
try {
|
|
newPrefix.close();
|
|
} catch (final IOException e) {
|
|
ConcurrentLog.logException(e);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private final static byte[] newPrefix(final byte[] oldPrefix, final byte[] multi_key, final int i) {
|
|
final ByteBuffer newPrefix = new ByteBuffer(oldPrefix.length + multi_key.length + 8);
|
|
newPrefix.append(oldPrefix).append(multi_key).append(ul).append(ASCII.getBytes(Integer.toString(i))).append(ul);
|
|
try {
|
|
newPrefix.close();
|
|
} catch (final IOException e) {
|
|
ConcurrentLog.logException(e);
|
|
}
|
|
return newPrefix.getBytes();
|
|
}
|
|
|
|
private final static String getPatternKey(final byte[] prefix, final byte[] key) {
|
|
final ByteBuffer patternKey = new ByteBuffer(prefix.length + key.length);
|
|
patternKey.append(prefix).append(key);
|
|
try {
|
|
return UTF8.String(patternKey.getBytes());
|
|
} finally {
|
|
try {
|
|
patternKey.close();
|
|
} catch (final IOException e) {
|
|
ConcurrentLog.logException(e);
|
|
}
|
|
}
|
|
}
|
|
|
|
private final static byte[] appendBytes(final byte[] b1, final byte[] b2, final byte[] b3, final byte[] b4) {
|
|
final ByteBuffer byteArray = new ByteBuffer(b1.length + b2.length + (b3 == null ? 0 : b3.length) + (b4 == null ? 0 : b4.length));
|
|
byteArray.append(b1).append(b2);
|
|
if (b3 != null) byteArray.append(b3);
|
|
if (b4 != null) byteArray.append(b4);
|
|
final byte[] result = byteArray.getBytes();
|
|
try {
|
|
byteArray.close();
|
|
} catch (final IOException e) {
|
|
ConcurrentLog.logException(e);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public static void main(final String[] args) {
|
|
// arg1 = test input; arg2 = replacement for pattern 'test'; arg3 = default replacement
|
|
try {
|
|
final InputStream i = new ByteArrayInputStream(UTF8.getBytes(args[0]));
|
|
final serverObjects h = new serverObjects();
|
|
h.put("test", args[1]);
|
|
writeTemplate("test", new PushbackInputStream(i, 100), System.out, h, UTF8.getBytes(args[2]));
|
|
System.out.flush();
|
|
} catch (final Exception e) {
|
|
ConcurrentLog.logException(e);
|
|
}
|
|
}
|
|
}
|