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278 lines
11 KiB
278 lines
11 KiB
// Column.java
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// (C) 2006 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 24.05.2006 on http://www.anomic.de
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//
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// This is a part of the kelondro database,
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// which is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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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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//
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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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//
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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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package net.yacy.kelondro.index;
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import net.yacy.kelondro.util.kelondroException;
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public final class Column {
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public static final int celltype_undefined = 0;
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public static final int celltype_boolean = 1;
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public static final int celltype_binary = 2;
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public static final int celltype_string = 3;
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public static final int celltype_cardinal = 4;
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public static final int celltype_bitfield = 5;
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public static final int encoder_none = 0;
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public static final int encoder_b64e = 1;
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public static final int encoder_b256 = 2;
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public static final int encoder_bytes = 3;
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public int cellwidth;
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public final String nickname;
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protected final int celltype;
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protected final int encoder;
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protected final String description;
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public Column(final String nickname, final int celltype, final int encoder, final int cellwidth, final String description) {
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this.celltype = celltype;
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this.cellwidth = cellwidth;
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this.encoder = encoder;
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this.nickname = nickname;
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this.description = description;
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}
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public Column(String celldef) {
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// define column with column syntax
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// example: <UDate-3>
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// cut quotes etc.
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celldef = celldef.trim();
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if (celldef.length() > 0 && celldef.charAt(0) == '<') celldef = celldef.substring(1);
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if (celldef.endsWith(">")) celldef = celldef.substring(0, celldef.length() - 1);
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// parse type definition
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int p = celldef.indexOf(' ');
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String typename = "";
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if (p < 0) {
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// no typedef
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this.celltype = celltype_undefined;
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this.cellwidth = -1;
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} else {
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typename = celldef.substring(0, p);
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celldef = celldef.substring(p + 1).trim();
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if (typename.equals("boolean")) {
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this.celltype = celltype_boolean;
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this.cellwidth = 1;
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} else if (typename.equals("byte")) {
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this.celltype = celltype_cardinal;
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this.cellwidth = 1;
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} else if (typename.equals("short")) {
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this.celltype = celltype_cardinal;
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this.cellwidth = 2;
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} else if (typename.equals("int")) {
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this.celltype = celltype_cardinal;
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this.cellwidth = 4;
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} else if (typename.equals("long")) {
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this.celltype = celltype_cardinal;
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this.cellwidth = 8;
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} else if (typename.equals("byte[]")) {
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this.celltype = celltype_binary;
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this.cellwidth = -1; // yet undefined
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} else if (typename.equals("char")) {
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this.celltype = celltype_string;
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this.cellwidth = 1;
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} else if (typename.equals("String")) {
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this.celltype = celltype_string;
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this.cellwidth = -1; // yet undefined
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} else if (typename.equals("Cardinal")) {
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this.celltype = celltype_cardinal;
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this.cellwidth = -1; // yet undefined
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} else if (typename.equals("Bitfield")) {
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this.celltype = celltype_bitfield;
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this.cellwidth = -1; // yet undefined
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} else {
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throw new kelondroException("kelondroColumn - undefined type def '" + typename + "'");
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}
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}
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// parse length
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p = celldef.indexOf('-');
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if (p < 0) {
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// if the cell was defined with a type, we dont need to give an explicit with definition
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if (this.cellwidth < 0) throw new kelondroException("kelondroColumn - no cell width definition given");
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final int q = celldef.indexOf(' ');
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if (q < 0) {
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this.nickname = celldef;
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celldef = "";
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} else {
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this.nickname = celldef.substring(0, p);
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celldef = celldef.substring(q + 1);
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}
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} else {
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this.nickname = celldef.substring(0, p);
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final int q = celldef.indexOf(' ');
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if (q < 0) {
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try {
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this.cellwidth = Integer.parseInt(celldef.substring(p + 1));
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} catch (final NumberFormatException e) {
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throw new kelondroException("kelondroColumn - cellwidth description wrong:" + celldef.substring(p + 1));
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}
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celldef = "";
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} else {
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try {
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this.cellwidth = Integer.parseInt(celldef.substring(p + 1, q));
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} catch (final NumberFormatException e) {
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throw new kelondroException("kelondroColumn - cellwidth description wrong:" + celldef.substring(p + 1, q));
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}
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celldef = celldef.substring(q + 1);
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}
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}
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// check length constraints
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if (this.cellwidth < 0) throw new kelondroException("kelondroColumn - no cell width given for " + this.nickname);
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if (((typename.equals("boolean")) && (this.cellwidth > 1)) ||
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((typename.equals("byte")) && (this.cellwidth > 1)) ||
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((typename.equals("short")) && (this.cellwidth > 2)) ||
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((typename.equals("int")) && (this.cellwidth > 4)) ||
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((typename.equals("long")) && (this.cellwidth > 8)) ||
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((typename.equals("char")) && (this.cellwidth > 1))
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) throw new kelondroException("kelondroColumn - cell width " + this.cellwidth + " too wide for type " + typename);
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/*
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if (((typename.equals("short")) && (this.cellwidth <= 1)) ||
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((typename.equals("int")) && (this.cellwidth <= 2)) ||
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((typename.equals("long")) && (this.cellwidth <= 4))
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) throw new kelondroException("kelondroColumn - cell width " + this.cellwidth + " not appropriate for type " + typename);
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*/
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// parse/check encoder type
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if (celldef.length() > 0 && celldef.charAt(0) == '{') {
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p = celldef.indexOf('}');
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final String expf = celldef.substring(1, p);
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celldef = celldef.substring(p + 1).trim();
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if (expf.equals("b64e")) this.encoder = encoder_b64e;
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else if (expf.equals("b256")) this.encoder = encoder_b256;
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else if (expf.equals("bytes")) this.encoder = encoder_bytes;
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else {
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if (this.celltype == celltype_undefined) this.encoder = encoder_bytes;
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else if (this.celltype == celltype_boolean) this.encoder = encoder_bytes;
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else if (this.celltype == celltype_binary) this.encoder = encoder_bytes;
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else if (this.celltype == celltype_string) this.encoder = encoder_bytes;
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else throw new kelondroException("kelondroColumn - encoder missing for cell '" + this.nickname + "'");
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}
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} else {
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if (this.celltype == celltype_cardinal) throw new kelondroException("kelondroColumn - encoder missing for cell " + this.nickname);
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this.encoder = encoder_bytes;
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}
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assert (this.celltype != celltype_cardinal) || (this.encoder == encoder_b64e) || (this.encoder == encoder_b256);
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// parse/check description
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if (celldef.length() > 0 && celldef.charAt(0) == '"') {
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p = celldef.indexOf('"', 1);
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this.description = celldef.substring(1, p);
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//unused: celldef = celldef.substring(p + 1).trim();
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} else {
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this.description = this.nickname;
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}
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}
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public final String toString() {
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final StringBuilder s = new StringBuilder();
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switch (celltype) {
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case celltype_undefined:
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s.append(nickname);
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s.append('-');
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s.append(cellwidth);
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break;
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case celltype_boolean:
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s.append("boolean ");
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s.append(nickname);
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break;
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case celltype_binary:
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s.append("byte[] ");
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s.append(nickname);
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s.append('-');
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s.append(cellwidth);
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break;
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case celltype_string:
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s.append("String ");
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s.append(nickname);
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s.append('-');
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s.append(cellwidth);
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break;
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case celltype_cardinal:
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s.append("Cardinal ");
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s.append(nickname);
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s.append('-');
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s.append(cellwidth);
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break;
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case celltype_bitfield:
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s.append("Bitfield ");
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s.append(nickname);
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s.append('-');
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s.append(cellwidth);
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break;
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}
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switch (encoder) {
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case encoder_b64e:
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s.append(" {b64e}");
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break;
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case encoder_b256:
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s.append(" {b256}");
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break;
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}
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return new String(s);
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}
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/* (non-Javadoc)
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* @see java.lang.Object#hashCode()
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*/
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@Override
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public final int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + celltype;
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result = prime * result + cellwidth;
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result = prime * result + encoder;
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result = prime * result
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+ ((nickname == null) ? 0 : nickname.hashCode());
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return result;
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}
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/* (non-Javadoc)
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* @see java.lang.Object#equals(java.lang.Object)
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*/
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@Override
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public boolean equals(final Object obj) {
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if (this == obj) return true;
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if (obj == null) return false;
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if (!(obj instanceof Column)) return false;
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final Column other = (Column) obj;
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if (celltype != other.celltype) return false;
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if (cellwidth != other.cellwidth) return false;
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if (encoder != other.encoder) return false;
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if (nickname == null) {
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if (other.nickname != null) return false;
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} else if (!nickname.equals(other.nickname)) return false;
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return true;
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}
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}
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