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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.internal.search;
import java.io.*;
/**
* Parsed Document.
* It can be used to obtain multiple readers for the same document.
*/
public class ParsedDocument {
// Limit on how many characters will be indexed
// from a large document
private static final int charsLimit = 1000000;
Reader reader;
boolean read;
char[] docChars;
/**
* Constructor for ParsedDocument.
* @param reader reader obtained from the parser
*/
public ParsedDocument(Reader reader) {
this.reader = reader;
this.read = false;
}
public Reader newContentReader() {
if (!read) {
read = true;
readDocument();
}
return new CharArrayReader(docChars);
}
private void readDocument() {
CharArrayWriter writer = new CharArrayWriter();
char[] buf = new char[4096];
int n;
int charsWritten = 0;
try {
while (0 <= (n = reader.read(buf))) {
if (charsWritten < charsLimit) {
if (n > charsLimit - charsWritten) {
// do not exceed the specified limit of characters
writer.write(buf, 0, charsLimit - charsWritten);
charsWritten = charsLimit;
} else {
writer.write(buf, 0, n);
charsWritten += n;
}
} else {
// do not break out of the loop
// keep reading to avoid breaking pipes
}
}
} catch (IOException ioe) {
// do not do anything, will use characters read so far
} finally {
try {
reader.close();
} catch (IOException ioe2) {
}
}
docChars = writer.toCharArray();
}
}
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