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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2009-2010 Oracle and/or its affiliates. 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_1_1.html
* or packager/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 packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
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* and therefore, elected the GPL Version 2 license, then the option applies
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*/
package org.glassfish.flashlight.xml;
/**
* An abstract class that you can build upon to make your own custom parser.
* @author bnevins
*/
import java.io.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.stream.*;
import static javax.xml.stream.XMLStreamConstants.END_DOCUMENT;
import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
public abstract class StaxParser {
abstract protected void read() throws XMLStreamException, EndDocumentException;
public StaxParser(File f) throws XMLStreamException {
try {
xmlStream = new FileInputStream(f);
createParser();
}
catch(IOException ioe) {
throw new XMLStreamException(ioe);
}
}
public StaxParser(String resource, ClassLoader cl) throws XMLStreamException {
xmlStream = cl.getResourceAsStream(resource);
createParser();
}
public StaxParser(InputStream is) throws XMLStreamException {
xmlStream = is;
createParser();
}
/**
* The same as calling XmlStreamReader.next() except that we throw a special
* Exception if the end of the document was reached
* @return
* @throws XMLStreamException
* @throws xml.StaxParser.EndDocumentException if the end of the document is here
*/
protected int next() throws XMLStreamException, EndDocumentException {
int event = parser.next();
if (event == END_DOCUMENT) {
parser.close();
throw new EndDocumentException();
}
return event;
}
/**
* The cursor will be pointing at the START_ELEMENT of name when it returns.
* note that skipTree must be called. Otherwise we could be fooled by a
* sub-element with the same name as an outer element
*
* @param name the Element to skip to
* @throws javax.xml.stream.XMLStreamException
*/
protected void skipTo(String name) throws XMLStreamException, EndDocumentException {
while (true) {
nextStart();
// cursor is at a START_ELEMENT
String localName = parser.getLocalName();
if (name.equals(localName)) {
return;
} else {
skipTree(localName);
}
}
}
/**
* The cursor must be pointing at a START_ELEMENT. Returns all attributes
* in a Map
* @return Map of all attributes
* @throws IllegalStateException if the cursor is not pointing at a START_ELEMENT
*/
protected Map parseAttributes() {
int num = parser.getAttributeCount();
Map map = new HashMap();
for (int i = 0; i < num; i++) {
map.put(parser.getAttributeName(i).getLocalPart(), parser.getAttributeValue(i));
}
return map;
}
/**
* Skip to the first START_ELEMENT after the given START_ELEMENT name
* This is useful for skipping past the root element
* @param name The START_ELEMENT to skip past
* @throws XMLStreamException if any errors
* @throws xml.StaxParser.EndDocumentException if end of document reached first
*/
protected void skipPast(String name) throws XMLStreamException, EndDocumentException {
// Move to the first 'top-level' element under name
// Return with cursor pointing to first sub-element
skipTo(name);
nextStart();
}
/**
* Skip to the next START_ELEMENT
* @throws XMLStreamException
* @throws xml.StaxParser.EndDocumentException
*/
protected void nextStart() throws XMLStreamException, EndDocumentException {
while (next() != START_ELEMENT)
;
}
protected void close() {
try {
if (parser != null) {
parser.close();
}
}
catch (Exception e) {
// ignore
}
try {
if (xmlStream != null) {
xmlStream.close();
}
}
catch (Exception e) {
// ignore
}
}
///////////////////// private below //////////////////////////////////////
private void createParser() throws XMLStreamException {
XMLInputFactory xif = XMLInputFactory.newInstance();
parser = xif.createXMLStreamReader(xmlStream);
}
private void skipTree(String name) throws XMLStreamException, EndDocumentException {
// The cursor is pointing at the start-element of name.
// throw everything in this element away and return with the cursor
// pointing at its end-element.
while (true) {
int event = next();
if (event == END_ELEMENT && name.equals(parser.getLocalName())) {
return;
}
}
}
// this is so we can return from arbitrarily nested calls -- it is VERY easy
// to get into an infinite loop without this!
protected static class EndDocumentException extends Exception {
EndDocumentException() {
}
}
private InputStream xmlStream;
protected XMLStreamReader parser;
}