possible to add columns to an existing table git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2163 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
19 years ago
parent
4a907a570f
commit
c75cacda95
@ -0,0 +1,157 @@
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// kelondroFlexWidthArray.java
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// (C) 2006 by Michael Peter Christen; mc@anomic.de, Frankfurt a. M., Germany
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// first published 01.06.2006 on http://www.anomic.de
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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 de.anomic.kelondro;
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import java.io.File;
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import java.io.IOException;
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public class kelondroFlexWidthArray implements kelondroArray {
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private kelondroFixedWidthArray[] col;
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private kelondroRow rowdef;
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public kelondroFlexWidthArray(File path, String tablename, kelondroRow rowdef, boolean exitOnFail) throws IOException {
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this.rowdef = rowdef;
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// initialize columns
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col = new kelondroFixedWidthArray[rowdef.columns()];
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String check = "";
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for (int i = 0; i < rowdef.columns(); i++) {
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col = null;
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check += '_';
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}
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// open existing files
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String[] files = path.list();
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for (int i = 0; i < files.length; i++) {
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if ((files[i].startsWith("col.") && (files[i].endsWith(".list")))) {
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int colstart = Integer.parseInt(files[i].substring(4, 7));
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int colend = (files[i].charAt(7) == '-') ? Integer.parseInt(files[i].substring(8, 11)) : colstart;
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/*
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int columns[] = new int[colend - colstart + 1];
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for (int j = colstart; j <= colend; j++) columns[j-colstart] = rowdef.width(j);
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col[colstart] = new kelondroFixedWidthArray(new File(path, files[i]), columns, 0, true);
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*/
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col[colstart] = new kelondroFixedWidthArray(new File(path, files[i]));
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for (int j = colstart; j <= colend; j++) check = check.substring(0, j) + "X" + check.substring(j + 1);
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}
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}
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// check if all columns are there
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int p, q;
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while ((p = check.indexOf('_')) >= 0) {
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q = p;
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if (p != 0) while ((check.charAt(q) == '_') && (q <= check.length() - 1)) q++;
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// create new array file
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int columns[] = new int[q - p + 1];
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for (int j = p; j <= q; j++) {
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columns[j - p] = rowdef.width(j);
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check = check.substring(0, j) + "X" + check.substring(j + 1);
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}
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col[p] = new kelondroFixedWidthArray(new File(path, colfilename(p, q)), columns, 0, true);
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}
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}
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private static final String colfilename(int start, int end) {
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String f = Integer.toString(end);
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while (f.length() < 3) f = "0" + f;
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if (start == end) return "col." + f + ".list";
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f = Integer.toString(start) + "-" + f;
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while (f.length() < 7) f = "0" + f;
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return "col." + f + ".list";
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}
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public int size() {
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return col[0].size();
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}
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public int columns() {
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return rowdef.columns();
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}
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public synchronized kelondroRow.Entry set(int index, kelondroRow.Entry rowentry) throws IOException {
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int r = 0;
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kelondroRow.Entry e0, e1, p;
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p = rowdef.newEntry();
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while (r < rowdef.columns()) {
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e0 = col[r].row().newEntry(rowentry.bytes(), rowdef.colstart[r], rowdef.colstart[r] - rowdef.colstart[r + col[r].columns() - 1] + rowdef.width(r));
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e1 = col[r].set(index, e0);
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for (int i = 0; i < col[r].columns(); i++)
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p.setCol(r + i, e1.getColBytes(i));
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r = r + col[r].columns();
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}
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return p;
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}
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public synchronized kelondroRow.Entry get(int index) throws IOException {
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int r = 0;
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kelondroRow.Entry e, p;
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p = rowdef.newEntry();
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while (r < rowdef.columns()) {
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e = col[r].get(index);
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for (int i = 0; i < col[r].columns(); i++)
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p.setCol(r + i, e.getColBytes(i));
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r = r + col[r].columns();
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}
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return p;
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}
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public synchronized int add(kelondroRow.Entry rowentry) throws IOException {
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kelondroRow.Entry e;
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e = col[0].row().newEntry(rowentry.bytes(), rowdef.colstart[0], rowdef.colstart[0] - rowdef.colstart[col[0].columns() - 1] + rowdef.width(0));
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int index = col[0].add(e);
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int r = col[0].columns();
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while (r < rowdef.columns()) {
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e = col[r].row().newEntry(rowentry.bytes(), rowdef.colstart[r], rowdef.colstart[r] - rowdef.colstart[r + col[r].columns() - 1] + rowdef.width(r));
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col[r].set(index, e);
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r = r + col[r].columns();
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}
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return index;
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}
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public synchronized void remove(int index) throws IOException {
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int r = 0;
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while (r < rowdef.columns()) {
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col[r].remove(index);
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r = r + col[r].columns();
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}
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}
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public void print() throws IOException {
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System.out.println("PRINTOUT of table, length=" + size());
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kelondroRow.Entry row;
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for (int i = 0; i < size(); i++) {
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System.out.print("row " + i + ": ");
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row = get(i);
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for (int j = 0; j < columns(); j++) System.out.print(((row.empty(j)) ? "NULL" : row.getColString(j, "UTF-8")) + ", ");
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System.out.println();
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}
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System.out.println("EndOfTable");
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}
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}
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