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/* PIReader.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 processing.xml;

import java.io.Reader;

import java.io.IOException;

/**

* This reader reads data from another reader until the end of a processing

* instruction (?>) has been encountered.

*

* @author Marc De Scheemaecker

* @version $Name: RELEASE_2_2_1 $, $Revision: 1.3 $

*/

class PIReader

extends Reader

{

/**

* The encapsulated reader.

*/

private StdXMLReader reader;

/**

* True if the end of the stream has been reached.

*/

private boolean atEndOfData;

/**

* Creates the reader.

*

* @param reader the encapsulated reader

*/

PIReader(StdXMLReader reader)

{

this.reader = reader;

this.atEndOfData = false;

}

/**

* Cleans up the object when it's destroyed.

*/

protected void finalize()

throws Throwable

{

this.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

*/

public int read(char[] buffer,

int offset,

int size)

throws IOException

{

if (this.atEndOfData) {

return -1;

}

int charsRead = 0;

if ((offset + size) > buffer.length) {

size = buffer.length - offset;

}

while (charsRead < size) {

char ch = this.reader.read();

if (ch == '?') {

char ch2 = this.reader.read();

if (ch2 == '>') {

this.atEndOfData = true;

break;

}

this.reader.unread(ch2);

}

buffer[charsRead] = ch;

charsRead++;

}

if (charsRead == 0) {

charsRead = -1;

}

return charsRead;

}

/**

* Skips remaining data and closes the stream.

*

* @throws java.io.IOException

* if an error occurred reading the data

*/

public void close()

throws IOException

{

while (! this.atEndOfData) {

char ch = this.reader.read();

if (ch == '?') {

char ch2 = this.reader.read();

if (ch2 == '>') {

this.atEndOfData = true;

}

}

}

}

}