/*
* CDATAReader.java NanoXML/Java $Revision: 1.3 $ $Date: 2002/01/04 21:03:28 $
* $Name: RELEASE_2_2_1 $ This file is part of NanoXML 2 for Java. Copyright (C)
* 2000-2002 Marc De Scheemaecker, All Rights Reserved. This software is
* provided 'as-is', without any express or implied warranty. In no event will
* the authors be held liable for any damages arising from the use of this
* software. Permission is granted to anyone to use this software for any
* purpose, including commercial applications, and to alter it and redistribute
* it freely, subject to the following restrictions: 1. The origin of this
* software must not be misrepresented; you must not claim that you wrote the
* original software. If you use this software in a product, an acknowledgment
* in the product documentation would be appreciated but is not required. 2.
* Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software. 3. This notice may not be
* removed or altered from any source distribution.
*/
package org.freeplane.n3.nanoxml;
import java.io.IOException;
import java.io.Reader;
/**
* This reader reads data from another reader until the end of a CDATA section
* (]]>) has been encountered.
*
* @author Marc De Scheemaecker
* @version $Name: RELEASE_2_2_1 $, $Revision: 1.3 $
*/
class CDATAReader extends Reader {
/**
* True if the end of the stream has been reached.
*/
private boolean atEndOfData;
/**
* The encapsulated reader.
*/
private IXMLReader reader;
/**
* Saved char.
*/
private char savedChar;
/**
* Creates the reader.
*
* @param reader
* the encapsulated reader
*/
CDATAReader(final IXMLReader reader) {
this.reader = reader;
savedChar = 0;
atEndOfData = false;
}
/**
* Skips remaining data and closes the stream.
*
* @throws java.io.IOException
* if an error occurred reading the data
*/
@Override
public void close() throws IOException {
while (!atEndOfData) {
char ch = savedChar;
if (ch == 0) {
ch = reader.read();
}
else {
savedChar = 0;
}
if (ch == ']') {
final char ch2 = reader.read();
if (ch2 == ']') {
final char ch3 = reader.read();
if (ch3 == '>') {
break;
}
savedChar = ch2;
reader.unread(ch3);
}
else {
reader.unread(ch2);
}
}
}
atEndOfData = true;
}
/**
* Cleans up the object when it's destroyed.
*/
@Override
protected void finalize() throws Throwable {
reader = null;
super.finalize();
}
/**
* Reads a block of data.
*
* @param buffer
* where to put the read data
* @param offset
* first position in buffer to put the data
* @param size
* maximum number of chars to read
* @return the number of chars read, or -1 if at EOF
* @throws java.io.IOException
* if an error occurred reading the data
*/
@Override
public int read(final char[] buffer, final int offset, int size) throws IOException {
int charsRead = 0;
if (atEndOfData) {
return -1;
}
if ((offset + size) > buffer.length) {
size = buffer.length - offset;
}
while (charsRead < size) {
char ch = savedChar;
if (ch == 0) {
ch = reader.read();
}
else {
savedChar = 0;
}
if (ch == ']') {
final char ch2 = reader.read();
if (ch2 == ']') {
final char ch3 = reader.read();
if (ch3 == '>') {
atEndOfData = true;
break;
}
savedChar = ch2;
reader.unread(ch3);
}
else {
reader.unread(ch2);
}
}
buffer[charsRead] = ch;
charsRead++;
}
if (charsRead == 0) {
charsRead = -1;
}
return charsRead;
}
}