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Sun Java Streaming XML Parser (SJSXP) is the implementation of JSR 173.
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/*
* $Id: BufferManager.java,v 1.3 2007-07-19 22:33:12 ofung Exp $
*/
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.xml.stream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URL;
import java.nio.CharBuffer;
import com.sun.xml.stream.xerces.xni.parser.XMLInputSource;
/**
* @author Neeraj Bajaj, Sun Microsystems
*/
public abstract class BufferManager {
protected boolean endOfStream = false;
static boolean DEBUG = false;
public static BufferManager getBufferManager(XMLInputSource inputSource) throws java.io.IOException{
InputStream stream = inputSource.getByteStream();
if(stream instanceof FileInputStream){
if(DEBUG){
System.out.println("Using FileBufferManager");
}
return new FileBufferManager((FileInputStream)stream,inputSource.getEncoding());
}else{
if(DEBUG){
System.out.println("Using StreamBufferManager");
}
return new StreamBufferManager(stream, inputSource.getEncoding());
}
}
/**
* This function returns true if some character data was loaded. Data is available via getCharBuffer().
* If before calling this function CharBuffer had some data (i.e. remaining() > 0) then this function
* first calls CharBuffer.compact() and then it is filled with more data. After calling this function
* CharBuffer.position() is always 'zero'.
*
* @see CharBuffer.compact()
* @return true if some character data was loaded. False value can be assume to be end of current
* entity.
*/
public abstract boolean getMore() throws java.io.IOException;
public abstract CharBuffer getCharBuffer();
/**
*xxx: This should be an abstract method because in StreamBufferManager
* CharBuffer capacity doesn't grow
*/
public abstract boolean arrangeCapacity(int length) throws java.io.IOException;
/**{
if(getCharBuffer().limit() - getCharBuffer().position() >= length){
return true;
}
while( (getCharBuffer().limit() - getCharBuffer().position()) < length){
if(endOfStream())break;
getMore();
}
if(getCharBuffer().limit() - getCharBuffer().position() >= length){
return true;
}else{
return false;
}
}*/
/** This file signals the end of file
* @return true/false signals the end of file.
*/
public boolean endOfStream(){
return endOfStream;
}
public abstract void close() throws java.io.IOException;
public abstract void setEncoding(String encoding) throws java.io.IOException;
/**
* Returns the IANA encoding name that is auto-detected from
* the bytes specified, with the endian-ness of that encoding where appropriate.
*
* @param b4 The first four bytes of the input.
* @param count The number of bytes actually read.
* @return a 2-element array: the first element, an IANA-encoding string,
* the second element a Boolean which is true iff the document is big endian, false
* if it's little-endian, and null if the distinction isn't relevant.
*/
protected Object[] getEncodingName(byte[] b4, int count) {
if (count < 2) {
return new Object[]{"UTF-8", null};
}
// UTF-16, with BOM
int b0 = b4[0] & 0xFF;
int b1 = b4[1] & 0xFF;
if (b0 == 0xFE && b1 == 0xFF) {
// UTF-16, big-endian
return new Object [] {"UTF-16BE", new Boolean(true)};
}
if (b0 == 0xFF && b1 == 0xFE) {
// UTF-16, little-endian
return new Object [] {"UTF-16LE", new Boolean(false)};
}
// default to UTF-8 if we don't have enough bytes to make a
// good determination of the encoding
if (count < 3) {
return new Object [] {"UTF-8", null};
}
// UTF-8 with a BOM
int b2 = b4[2] & 0xFF;
if (b0 == 0xEF && b1 == 0xBB && b2 == 0xBF) {
return new Object [] {"UTF-8", null};
}
// default to UTF-8 if we don't have enough bytes to make a
// good determination of the encoding
if (count < 4) {
return new Object [] {"UTF-8", null};
}
// other encodings
int b3 = b4[3] & 0xFF;
if (b0 == 0x00 && b1 == 0x00 && b2 == 0x00 && b3 == 0x3C) {
// UCS-4, big endian (1234)
return new Object [] {"ISO-10646-UCS-4", new Boolean(true)};
}
if (b0 == 0x3C && b1 == 0x00 && b2 == 0x00 && b3 == 0x00) {
// UCS-4, little endian (4321)
return new Object [] {"ISO-10646-UCS-4", new Boolean(false)};
}
if (b0 == 0x00 && b1 == 0x00 && b2 == 0x3C && b3 == 0x00) {
// UCS-4, unusual octet order (2143)
// REVISIT: What should this be?
return new Object [] {"ISO-10646-UCS-4", null};
}
if (b0 == 0x00 && b1 == 0x3C && b2 == 0x00 && b3 == 0x00) {
// UCS-4, unusual octect order (3412)
// REVISIT: What should this be?
return new Object [] {"ISO-10646-UCS-4", null};
}
if (b0 == 0x00 && b1 == 0x3C && b2 == 0x00 && b3 == 0x3F) {
// UTF-16, big-endian, no BOM
// (or could turn out to be UCS-2...
// REVISIT: What should this be?
return new Object [] {"UTF-16BE", new Boolean(true)};
}
if (b0 == 0x3C && b1 == 0x00 && b2 == 0x3F && b3 == 0x00) {
// UTF-16, little-endian, no BOM
// (or could turn out to be UCS-2...
return new Object [] {"UTF-16LE", new Boolean(false)};
}
if (b0 == 0x4C && b1 == 0x6F && b2 == 0xA7 && b3 == 0x94) {
// EBCDIC
// a la xerces1, return CP037 instead of EBCDIC here
return new Object [] {"CP037", null};
}
// default encoding
return new Object [] {"UTF-8", null};
} // getEncodingName(byte[],int):Object[]
public static void main(String [] args){
try{
File file = new File(args[0]);
System.out.println("url parameter = " + file.toURI().toString());
URL url = new URL(file.toURI().toString());
XMLInputSource inputSource = new XMLInputSource(null,null,null,new FileInputStream(file),"UTF-8");
BufferManager sb = BufferManager.getBufferManager(inputSource);
CharBuffer cb = sb.getCharBuffer();
int i = 0 ;
while(sb.getMore()){
System.out.println("Loop " + i++ + " = " + sb.getCharBuffer());
}
System.out.println("End of stream reached = " + sb.endOfStream() );
System.out.println("Total no. of loops required = " + i);
}
catch(Exception ex){
ex.printStackTrace();
}
}
}
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