/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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.harmony.xml;
import org.xml.sax.ContentHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.LexicalHandler;
import java.io.IOException;
import java.io.Reader;
import java.io.InputStream;
import java.util.logging.Logger;
/**
* SAX wrapper around Expat. Interns strings. Does not support validation.
* Does not support {@link DTDHandler}.
*/
public class ExpatReader implements XMLReader {
private static final Logger logger
= Logger.getLogger(ExpatReader.class.getName());
/*
* ExpatParser accesses these fields directly during parsing. The user
* should be able to safely change them during parsing.
*/
/*package*/ ContentHandler contentHandler;
/*package*/ EntityResolver entityResolver;
/*package*/ ErrorHandler errorHandler;
/*package*/ LexicalHandler lexicalHandler;
private boolean processNamespaces = true;
private boolean processNamespacePrefixes = false;
private static final String LEXICAL_HANDLER_PROPERTY
= "http://xml.org/sax/properties/lexical-handler";
private static class Feature {
private static final String BASE_URI = "http://xml.org/sax/features/";
private static final String VALIDATION = BASE_URI + "validation";
private static final String NAMESPACES = BASE_URI + "namespaces";
private static final String NAMESPACE_PREFIXES
= BASE_URI + "namespace-prefixes";
private static final String STRING_INTERNING
= BASE_URI + "string-interning";
}
public boolean getFeature(String name)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("name");
}
if (name.equals(Feature.VALIDATION)) {
return false;
}
if (name.equals(Feature.NAMESPACES)) {
return processNamespaces;
}
if (name.equals(Feature.NAMESPACE_PREFIXES)) {
return processNamespacePrefixes;
}
if (name.equals(Feature.STRING_INTERNING)) {
return true;
}
throw new SAXNotRecognizedException(name);
}
public void setFeature(String name, boolean value)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("name");
}
if (name.equals(Feature.VALIDATION)) {
if (value) {
throw new SAXNotSupportedException("Cannot enable " + name);
} else {
// Default.
return;
}
}
if (name.equals(Feature.NAMESPACES)) {
processNamespaces = value;
return;
}
if (name.equals(Feature.NAMESPACE_PREFIXES)) {
processNamespacePrefixes = value;
return;
}
if (name.equals(Feature.STRING_INTERNING)) {
if (value) {
// Default.
return;
} else {
throw new SAXNotSupportedException("Cannot disable " + name);
}
}
throw new SAXNotRecognizedException(name);
}
public Object getProperty(String name)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("name");
}
if (name.equals(LEXICAL_HANDLER_PROPERTY)) {
return lexicalHandler;
}
throw new SAXNotRecognizedException(name);
}
public void setProperty(String name, Object value)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("name");
}
if (name.equals(LEXICAL_HANDLER_PROPERTY)) {
// The object must implement LexicalHandler
if (value instanceof LexicalHandler) {
this.lexicalHandler = (LexicalHandler) value;
return;
}
throw new SAXNotSupportedException("value doesn't implement " +
"org.xml.sax.ext.LexicalHandler");
}
throw new SAXNotRecognizedException(name);
}
public void setEntityResolver(EntityResolver resolver) {
this.entityResolver = resolver;
}
public EntityResolver getEntityResolver() {
return entityResolver;
}
/**
* Not implemented.
*/
public void setDTDHandler(DTDHandler ignored) {
logger.warning("DTD handlers aren't supported.");
}
/**
* Always returns null.
*/
public DTDHandler getDTDHandler() {
return null;
}
public void setContentHandler(ContentHandler handler) {
this.contentHandler = handler;
}
public ContentHandler getContentHandler() {
return this.contentHandler;
}
public void setErrorHandler(ErrorHandler handler) {
this.errorHandler = handler;
}
public ErrorHandler getErrorHandler() {
return errorHandler;
}
/**
* Returns the current lexical handler.
*
* @return the current lexical handler, or null if none has been registered
* @see #setLexicalHandler
*/
public LexicalHandler getLexicalHandler() {
return lexicalHandler;
}
/**
* Registers a lexical event handler. Supports neither
* {@link LexicalHandler#startEntity(String)} nor
* {@link LexicalHandler#endEntity(String)}.
*
* <p>If the application does not register a lexical handler, all
* lexical events reported by the SAX parser will be silently
* ignored.</p>
*
* <p>Applications may register a new or different handler in the
* middle of a parse, and the SAX parser must begin using the new
* handler immediately.</p>
*
* @param lexicalHandler listens for lexical events
* @see #getLexicalHandler()
*/
public void setLexicalHandler(LexicalHandler lexicalHandler) {
this.lexicalHandler = lexicalHandler;
}
/**
* Returns true if this SAX parser processes namespaces.
*
* @see #setNamespaceProcessingEnabled(boolean)
*/
public boolean isNamespaceProcessingEnabled() {
return processNamespaces;
}
/**
* Enables or disables namespace processing. Set to true by default. If you
* enable namespace processing, the parser will invoke
* {@link ContentHandler#startPrefixMapping(String, String)} and
* {@link ContentHandler#endPrefixMapping(String)}, and it will filter
* out namespace declarations from element attributes.
*
* @see #isNamespaceProcessingEnabled()
*/
public void setNamespaceProcessingEnabled(boolean processNamespaces) {
this.processNamespaces = processNamespaces;
}
public void parse(InputSource input) throws IOException, SAXException {
if (processNamespacePrefixes == processNamespaces) {
/*
* Expat has XML_SetReturnNSTriplet, but that still doesn't
* include xmlns attributes like this feature requires. We may
* have to implement namespace processing ourselves if we want
* this (not too difficult). We obviously "support" namespace
* prefixes if namespaces are disabled.
*/
throw new SAXNotSupportedException("The 'namespace-prefix' " +
"feature is not supported while the 'namespaces' " +
"feature is enabled.");
}
// Try the character stream.
Reader reader = input.getCharacterStream();
if (reader != null) {
try {
parse(reader, input.getPublicId(), input.getSystemId());
} finally {
// TODO: Don't eat original exception when close() throws.
reader.close();
}
return;
}
// Try the byte stream.
InputStream in = input.getByteStream();
String encoding = input.getEncoding();
if (in != null) {
try {
parse(in, encoding, input.getPublicId(), input.getSystemId());
} finally {
// TODO: Don't eat original exception when close() throws.
in.close();
}
return;
}
String systemId = input.getSystemId();
if (systemId == null) {
throw new SAXException("No input specified.");
}
// Try the system id.
in = ExpatParser.openUrl(systemId);
try {
parse(in, encoding, input.getPublicId(), systemId);
} finally {
in.close();
}
}
private void parse(Reader in, String publicId, String systemId)
throws IOException, SAXException {
ExpatParser parser = new ExpatParser(
ExpatParser.CHARACTER_ENCODING,
this,
processNamespaces,
publicId,
systemId
);
parser.parseDocument(in);
}
private void parse(InputStream in, String encoding, String publicId,
String systemId) throws IOException, SAXException {
ExpatParser parser = new ExpatParser(
encoding,
this,
processNamespaces,
publicId,
systemId
);
parser.parseDocument(in);
}
public void parse(String systemId) throws IOException, SAXException {
parse(new InputSource(systemId));
}
}
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