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401 lines
14 KiB
401 lines
14 KiB
// kelondroStack.java
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// -----------------------
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// part of The Kelondro Database
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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 change: 11.01.2004
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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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/*
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This class extends the kelondroRecords and adds a stack structure
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*/
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package de.anomic.kelondro;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileReader;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.Iterator;
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import java.util.StringTokenizer;
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public final class kelondroStack extends kelondroFullRecords {
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// define the Over-Head-Array
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private static short thisOHBytes = 0; // our record definition does not need extra bytes
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private static short thisOHHandles = 2; // and two handles overhead for a double-chained list
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private static short thisFHandles = 2; // two file handles for root handle and handle to last element
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// define pointers for OH array access
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protected static final int left = 0; // pointer for OHHandle-array: handle()-Value of left child Node
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protected static final int right = 1; // pointer for OHHandle-array: handle()-Value of right child Node
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protected static final int root = 0; // pointer for FHandles-array: pointer to root node
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protected static final int toor = 1; // pointer for FHandles-array: pointer to root node
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public kelondroStack(final File file, final kelondroRow rowdef) throws IOException {
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// this creates a new stack
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super(file, thisOHBytes, thisOHHandles, rowdef, thisFHandles, rowdef.columns() /* txtProps */, 80 /* txtPropWidth */);
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if (super.fileExisted) {
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//if ((getHandle(root) == null) && (getHandle(toor) == null)) clear();
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} else {
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setHandle(root, null); // define the root value
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setHandle(toor, null); // define the toor value
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}
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}
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public static final kelondroStack open(final File file, final kelondroRow rowdef) {
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try {
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return new kelondroStack(file, rowdef);
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} catch (final IOException e) {
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file.delete();
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try {
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return new kelondroStack(file, rowdef);
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} catch (final IOException ee) {
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System.out.println("kelondroStack: cannot open or create file " + file.toString());
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e.printStackTrace();
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ee.printStackTrace();
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return null;
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}
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}
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}
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public static kelondroStack reset(final kelondroStack stack) {
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// memorize settings to this file
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final File f = new File(stack.filename);
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final kelondroRow row = stack.row();
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// close and delete the file
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try {stack.close();} catch (final Exception e) {}
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if (f.exists()) f.delete();
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// re-open a database with same settings as before
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return open(f, row);
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}
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public Iterator<kelondroRow.Entry> stackIterator(final boolean up) {
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// iterates the elements in an ordered way.
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// returns kelondroRow.Entry - type Objects
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return new stackIterator(up);
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}
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public class stackIterator implements Iterator<kelondroRow.Entry> {
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kelondroHandle nextHandle = null;
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kelondroHandle lastHandle = null;
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boolean up;
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public stackIterator(final boolean up) {
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this.up = up;
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nextHandle = getHandle((up) ? root : toor);
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}
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public boolean hasNext() {
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return (nextHandle != null);
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}
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public kelondroRow.Entry next() {
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lastHandle = nextHandle;
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try {
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nextHandle = new EcoNode(nextHandle).getOHHandle((up) ? right : left);
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return row().newEntry(new EcoNode(lastHandle).getValueRow());
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} catch (final IOException e) {
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e.printStackTrace();
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throw new kelondroException(filename, "IO error at stackIterator.next(): " + e.getMessage());
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}
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}
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public void remove() {
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try {
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unlinkNode(new EcoNode(lastHandle));
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} catch (final IOException e) {
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e.printStackTrace();
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}
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}
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}
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public synchronized int size() {
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return super.size();
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}
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public synchronized void push(final kelondroRow.Entry row) throws IOException {
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// check if there is already a stack
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if (getHandle(toor) == null) {
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if (getHandle(root) != null) throw new RuntimeException("push: internal organisation of root and toor");
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// create node
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final kelondroNode n = new EcoNode(row.bytes());
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n.setOHHandle(left, null);
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n.setOHHandle(right, null);
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n.commit();
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// assign handles
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setHandle(root, n.handle());
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setHandle(toor, n.handle());
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// thats it
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} else {
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// expand the list at the end
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final kelondroNode n = new EcoNode(row.bytes());
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n.setOHHandle(left, getHandle(toor));
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n.setOHHandle(right, null);
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final kelondroNode n1 = new EcoNode(getHandle(toor));
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n1.setOHHandle(right, n.handle());
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n.commit();
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n1.commit();
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// assign handles
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setHandle(toor, n.handle());
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// thats it
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}
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}
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public synchronized kelondroRow.Entry pop() throws IOException {
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// return row ontop of the stack and shrink stack by one
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final kelondroNode n = topNode();
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if (n == null) return null;
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final kelondroRow.Entry ret = row().newEntry(n.getValueRow());
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// remove node
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unlinkNode(n);
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deleteNode(n.handle());
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return ret;
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}
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public synchronized kelondroRow.Entry top() throws IOException {
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// return row ontop of the stack
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final kelondroNode n = topNode();
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if (n == null) return null;
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return row().newEntry(n.getValueRow());
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}
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public synchronized kelondroRow.Entry pot() throws IOException {
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// return row on the bottom of the stack and remove record
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final kelondroNode n = botNode();
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if (n == null) return null;
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final kelondroRow.Entry ret = row().newEntry(n.getValueRow());
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// remove node
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unlinkNode(n);
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deleteNode(n.handle());
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return ret;
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}
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public synchronized kelondroRow.Entry bot() throws IOException {
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// return row on the bottom of the stack
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final kelondroNode n = botNode();
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if (n == null) return null;
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return row().newEntry(n.getValueRow());
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}
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void unlinkNode(final kelondroNode n) throws IOException {
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// join chaines over node
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final kelondroHandle l = n.getOHHandle(left);
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final kelondroHandle r = n.getOHHandle(right);
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// look left
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if (l == null) {
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// reached the root on left side
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setHandle(root, r);
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} else {
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// un-link the previous record
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final kelondroNode k = new EcoNode(l);
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k.setOHHandle(left, k.getOHHandle(left));
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k.setOHHandle(right, r);
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k.commit();
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}
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// look right
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if (r == null) {
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// reached the root on right side
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setHandle(toor, l);
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} else {
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// un-link the following record
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final kelondroNode k = new EcoNode(r);
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k.setOHHandle(left, l);
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k.setOHHandle(right, k.getOHHandle(right));
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k.commit();
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}
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}
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private kelondroNode topNode() throws IOException {
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// return node ontop of the stack
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if (size() == 0) return null;
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final kelondroHandle h = getHandle(toor);
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if (h == null) return null;
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return new EcoNode(h);
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}
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private kelondroNode botNode() throws IOException {
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// return node on bottom of the stack
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if (size() == 0) return null;
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final kelondroHandle h = getHandle(root);
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if (h == null) return null;
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return new EcoNode(h);
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}
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public int imp(final File file, final String separator) throws IOException {
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// imports a value-separated file, returns number of records that have been read
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RandomAccessFile f = null;
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try {
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f = new RandomAccessFile(file,"r");
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String s;
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StringTokenizer st;
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int recs = 0;
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final kelondroRow.Entry buffer = row().newEntry();
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int c;
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int line = 0;
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while ((s = f.readLine()) != null) {
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s = s.trim();
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line++;
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if ((s.length() > 0) && (!(s.startsWith("#")))) {
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st = new StringTokenizer(s, separator);
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// buffer the entry
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c = 0;
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while ((c < row().columns()) && (st.hasMoreTokens())) {
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buffer.setCol(c++, st.nextToken().trim().getBytes());
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}
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if ((st.hasMoreTokens()) || (c != row().columns())) {
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System.err.println("inapropriate number of entries in line " + line);
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} else {
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push(buffer);
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recs++;
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}
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}
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}
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return recs;
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} finally {
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if (f!=null) try{f.close();}catch(final Exception e){}
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}
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}
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public String hp(final kelondroHandle h) {
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if (h == null)
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return "NULL";
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return h.toString();
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}
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public void print() throws IOException {
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super.print();
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final Iterator<kelondroRow.Entry> it = stackIterator(true);
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kelondroRow.Entry r;
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while (it.hasNext()) {
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r = it.next();
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System.out.print(" KEY:'" + r.getColString(0, null) + "'");
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for (int j = 1; j < row().columns(); j++)
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System.out.print(", V[" + j + "]:'" + r.getColString(j, null) + "'");
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System.out.println();
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}
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System.out.println();
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}
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private static void cmd(final String[] args) {
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System.out.print("kelondroStack ");
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for (int i = 0; i < args.length; i++) System.out.print(args[i] + " ");
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System.out.println("");
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byte[] ret = null;
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final kelondroRow lens = new kelondroRow("byte[] key-" + Integer.parseInt(args[1]) + ", byte[] value-" + Integer.parseInt(args[2]), kelondroNaturalOrder.naturalOrder, 0);
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try {
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if ((args.length > 4) || (args.length < 2)) {
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System.err.println("usage: kelondroStack -c|-p|-v|-g|-i|-s [file]|[key [value]] <db-file>");
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System.err.println("( create, push, view, (g)pop, imp, shell)");
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System.exit(0);
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} else if (args.length == 2) {
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kelondroStack fm = new kelondroStack(new File(args[1]), lens);
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if (args[0].equals("-v")) {
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fm.print();
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ret = null;
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} else if (args[0].equals("-g")) {
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fm = new kelondroStack(new File(args[1]), lens);
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final kelondroRow.Entry ret2 = fm.pop();
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ret = ((ret2 == null) ? null : ret2.getColBytes(1));
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fm.close();
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}
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fm.close();
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} else if (args.length == 3) {
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if (args[0].equals("-i")) {
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final kelondroStack fm = new kelondroStack(new File(args[2]), lens);
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final int i = fm.imp(new File(args[1]),";");
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fm.close();
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ret = (i + " records imported").getBytes();
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} else if (args[0].equals("-s")) {
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final String db = args[2];
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BufferedReader f = null;
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try {
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f = new BufferedReader(new FileReader(args[1]));
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String m;
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while (true) {
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m = f.readLine();
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if (m == null) break;
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if ((m.length() > 1) && (!m.startsWith("#"))) {
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m = m + " " + db;
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cmd(line2args(m));
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}
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}
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ret = null;
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} finally {
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if (f != null) try {f.close();}catch(final Exception e) {}
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}
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} else if (args[0].equals("-g")) {
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final kelondroStack fm = new kelondroStack(new File(args[2]), lens);
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final kelondroRow.Entry ret2 = fm.pop();
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ret = ((ret2 == null) ? null : ret2.getColBytes(1));
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fm.close();
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}
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} else if (args.length == 4) {
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if (args[0].equals("-c")) {
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// create <keylen> <valuelen> <filename>
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final File f = new File(args[3]);
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if (f.exists()) f.delete();
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final kelondroStack fm = new kelondroStack(f, lens);
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fm.close();
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} else if (args[0].equals("-p")) {
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final kelondroStack fm = new kelondroStack(new File(args[3]), lens);
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fm.push(fm.row().newEntry(new byte[][] {args[1].getBytes(), args[2].getBytes()}));
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fm.close();
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}
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}
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if (ret == null)
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System.out.println("NULL");
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else
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System.out.println(new String(ret));
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} catch (final Exception e) {
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e.printStackTrace();
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}
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}
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public static void main(final String[] args) {
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// -c 10 20 test.stack
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// -p a a1 test.stack
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// -p b b1 test.stack
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// -p c c1 test.stack
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// -v test.stack
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// -g test.stack
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// -v test.stack
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// -g 1 test.stack
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cmd(args);
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/*
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kelondroStack s = new kelondroStack(new File("/Users/admin/dev/yacy/trunk/test.stack"), 1024, new int[]{10,10}, false);
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try {
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s.push(s.row().newEntry(new byte[][]{"test123".getBytes(), "abcdefg".getBytes()}));
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s.close();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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*/
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}
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}
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