/*
* ContentReader.java NanoXML/Java $Revision: 1.4 $ $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 a new element has been
* encountered.
*
* @author Marc De Scheemaecker
* @version $Name: RELEASE_2_2_1 $, $Revision: 1.4 $
*/
class ContentReader extends Reader {
/**
* Buffer.
*/
private String buffer;
/**
* Pointer into the buffer.
*/
private int bufferIndex;
/**
* The encapsulated reader.
*/
private IXMLReader reader;
/**
* The entity resolver.
*/
private IXMLEntityResolver resolver;
/**
* Creates the reader.
*
* @param reader
* the encapsulated reader
* @param resolver
* the entity resolver
* @param buffer
* data that has already been read from <code>reader</code>
*/
ContentReader(final IXMLReader reader, final IXMLEntityResolver resolver, final String buffer) {
this.reader = reader;
this.resolver = resolver;
this.buffer = buffer;
bufferIndex = 0;
}
/**
* Skips remaining data and closes the stream.
*
* @throws java.io.IOException
* if an error occurred reading the data
*/
@Override
public void close() throws IOException {
try {
final int bufferLength = buffer.length();
for (;;) {
String str = "";
char ch;
if (bufferIndex >= bufferLength) {
str = XMLUtil.read(reader, '&');
ch = str.charAt(0);
}
else {
ch = buffer.charAt(bufferIndex);
bufferIndex++;
continue;
}
if (ch == '<') {
reader.unread(ch);
break;
}
if ((ch == '&') && (str.length() > 1)) {
if (str.charAt(1) != '#') {
XMLUtil.processEntity(str, reader, resolver);
}
}
}
}
catch (final XMLParseException e) {
throw new IOException(e.getMessage());
}
}
/**
* Cleans up the object when it's destroyed.
*/
@Override
protected void finalize() throws Throwable {
reader = null;
resolver = null;
buffer = null;
super.finalize();
}
/**
* Reads a block of data.
*
* @param outputBuffer
* 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[] outputBuffer, final int offset, int size) throws IOException {
try {
int charsRead = 0;
final int bufferLength = buffer.length();
if ((offset + size) > outputBuffer.length) {
size = outputBuffer.length - offset;
}
while (charsRead < size) {
String str = "";
char ch;
if (bufferIndex >= bufferLength) {
str = XMLUtil.read(reader, '&');
ch = str.charAt(0);
}
else {
ch = buffer.charAt(bufferIndex);
bufferIndex++;
outputBuffer[charsRead] = ch;
charsRead++;
continue;
}
if (ch == '<') {
reader.unread(ch);
break;
}
if ((ch == '&') && (str.length() > 1)) {
if (str.charAt(1) == '#') {
ch = XMLUtil.processCharLiteral(str);
}
else {
XMLUtil.processEntity(str, reader, resolver);
continue;
}
}
outputBuffer[charsRead] = ch;
charsRead++;
}
if (charsRead == 0) {
charsRead = -1;
}
return charsRead;
}
catch (final XMLParseException e) {
throw new IOException(e.getMessage());
}
}
}