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/*
* Copyright 2003, 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xmlrpc.parser;
import java.util.ArrayList;
import java.util.List;
import javax.xml.namespace.QName;
import org.apache.xmlrpc.serializer.XmlRpcWriter;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/** Base class for parsing external XML representations, like DOM,
* or JAXB.
*/
public abstract class ExtParser implements TypeParser {
private Locator locator;
private ContentHandler handler;
private int level = 0;
private final List prefixes = new ArrayList();
/** Returns a content handler for parsing the actual
* contents.
* @return A SAX handler for parsing the XML inside
* the outer ex:foo element.
* @throws SAXException Creating the handler failed.
*/
protected abstract ContentHandler getExtHandler() throws SAXException;
/** Returns the outer node name.
*/
protected abstract String getTagName();
public void endDocument() throws SAXException {
}
public void startDocument() throws SAXException {
}
public void characters(char[] pChars, int pOffset, int pLength)
throws SAXException {
if (handler == null) {
if (!TypeParserImpl.isEmpty(pChars, pOffset, pLength)) {
throw new SAXParseException("Unexpected non-whitespace content: " + new String(pChars, pOffset, pLength),
locator);
}
} else {
handler.characters(pChars, pOffset, pLength);
}
}
public void ignorableWhitespace(char[] pChars, int pOffset, int pLength)
throws SAXException {
if (handler != null) {
ignorableWhitespace(pChars, pOffset, pLength);
}
}
public void endPrefixMapping(String pPrefix) throws SAXException {
if (handler != null) {
handler.endPrefixMapping(pPrefix);
}
}
public void skippedEntity(String pName) throws SAXException {
if (handler == null) {
throw new SAXParseException("Don't know how to handle entity " + pName,
locator);
} else {
handler.skippedEntity(pName);
}
}
public void setDocumentLocator(Locator pLocator) {
locator = pLocator;
if (handler != null) {
handler.setDocumentLocator(pLocator);
}
}
public void processingInstruction(String pTarget, String pData)
throws SAXException {
if (handler != null) {
handler.processingInstruction(pTarget, pData);
}
}
public void startPrefixMapping(String pPrefix, String pURI)
throws SAXException {
if (handler == null) {
prefixes.add(pPrefix);
prefixes.add(pURI);
} else {
handler.startPrefixMapping(pPrefix, pURI);
}
}
public void startElement(String pURI, String pLocalName,
String pQName, Attributes pAttrs) throws SAXException {
switch (level++) {
case 0:
final String tag = getTagName();
if (!XmlRpcWriter.EXTENSIONS_URI.equals(pURI) ||
!tag.equals(pLocalName)) {
throw new SAXParseException("Expected " +
new QName(XmlRpcWriter.EXTENSIONS_URI, tag) +
", got " +
new QName(pURI, pLocalName),
locator);
}
handler = getExtHandler();
handler.startDocument();
for (int i = 0; i < prefixes.size(); i += 2) {
handler.startPrefixMapping((String) prefixes.get(i),
(String) prefixes.get(i+1));
}
break;
default:
handler.startElement(pURI, pLocalName, pQName, pAttrs);
break;
}
}
public void endElement(String pURI, String pLocalName, String pQName)
throws SAXException {
switch (--level) {
case 0:
for (int i = 0; i < prefixes.size(); i += 2) {
handler.endPrefixMapping((String) prefixes.get(i));
}
handler.endDocument();
handler = null;
break;
default:
handler.endElement(pURI, pLocalName, pQName);
break;
}
}
}
