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/* 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 net.n3.nanoxml;
import java.io.Reader;
import java.io.IOException;
/**
* 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
{
/**
* The encapsulated reader.
*/
private IXMLReader reader;
/**
* Buffer.
*/
private String buffer;
/**
* Pointer into the buffer.
*/
private int bufferIndex;
/**
* 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(IXMLReader reader,
IXMLEntityResolver resolver,
String buffer)
{
this.reader = reader;
this.resolver = resolver;
this.buffer = buffer;
this.bufferIndex = 0;
}
/**
* Cleans up the object when it's destroyed.
*/
protected void finalize()
throws Throwable
{
this.reader = null;
this.resolver = null;
this.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
*/
public int read(char[] outputBuffer,
int offset,
int size)
throws IOException
{
try {
int charsRead = 0;
int bufferLength = this.buffer.length();
if ((offset + size) > outputBuffer.length) {
size = outputBuffer.length - offset;
}
while (charsRead < size) {
String str = "";
char ch;
if (this.bufferIndex >= bufferLength) {
str = XMLUtil.read(this.reader, '&');
ch = str.charAt(0);
} else {
ch = this.buffer.charAt(this.bufferIndex);
this.bufferIndex++;
outputBuffer[charsRead] = ch;
charsRead++;
continue; // don't interprete chars in the buffer
}
if (ch == '<') {
this.reader.unread(ch);
break;
}
if ((ch == '&') && (str.length() > 1)) {
if (str.charAt(1) == '#') {
ch = XMLUtil.processCharLiteral(str);
} else {
XMLUtil.processEntity(str, this.reader, this.resolver);
continue;
}
}
outputBuffer[charsRead] = ch;
charsRead++;
}
if (charsRead == 0) {
charsRead = -1;
}
return charsRead;
} catch (XMLParseException e) {
throw new IOException(e.getMessage());
}
}
/**
* Skips remaining data and closes the stream.
*
* @throws java.io.IOException
* if an error occurred reading the data
*/
public void close()
throws IOException
{
try {
int bufferLength = this.buffer.length();
for (;;) {
String str = "";
char ch;
if (this.bufferIndex >= bufferLength) {
str = XMLUtil.read(this.reader, '&');
ch = str.charAt(0);
} else {
ch = this.buffer.charAt(this.bufferIndex);
this.bufferIndex++;
continue; // don't interprete chars in the buffer
}
if (ch == '<') {
this.reader.unread(ch);
break;
}
if ((ch == '&') && (str.length() > 1)) {
if (str.charAt(1) != '#') {
XMLUtil.processEntity(str, this.reader, this.resolver);
}
}
}
} catch (XMLParseException e) {
throw new IOException(e.getMessage());
}
}
}
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