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nl.nn.xmldecoder.DocumentHandler Maven / Gradle / Ivy
/*
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package nl.nn.xmldecoder;
import java.beans.ExceptionListener;
import java.io.IOException;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* The main class to parse JavaBeans XML archive.
*
* @since 1.7
*
* @author Sergey A. Malenkov
*
* @see ElementHandler
*/
public final class DocumentHandler extends DefaultHandler {
private final Map> handlers = new HashMap>();
private final Map environment = new HashMap();
private final List objects = new ArrayList();
private Reference loader;
private ExceptionListener listener;
private Object owner;
private ElementHandler handler;
/**
* Creates new instance of document handler.
*/
public DocumentHandler() {
setElementHandler("java", JavaElementHandler.class); // NON-NLS: the element name
setElementHandler("null", NullElementHandler.class); // NON-NLS: the element name
setElementHandler("array", ArrayElementHandler.class); // NON-NLS: the element name
setElementHandler("class", ClassElementHandler.class); // NON-NLS: the element name
setElementHandler("string", StringElementHandler.class); // NON-NLS: the element name
setElementHandler("object", ObjectElementHandler.class); // NON-NLS: the element name
setElementHandler("void", VoidElementHandler.class); // NON-NLS: the element name
setElementHandler("char", CharElementHandler.class); // NON-NLS: the element name
setElementHandler("byte", ByteElementHandler.class); // NON-NLS: the element name
setElementHandler("short", ShortElementHandler.class); // NON-NLS: the element name
setElementHandler("int", IntElementHandler.class); // NON-NLS: the element name
setElementHandler("long", LongElementHandler.class); // NON-NLS: the element name
setElementHandler("float", FloatElementHandler.class); // NON-NLS: the element name
setElementHandler("double", DoubleElementHandler.class); // NON-NLS: the element name
setElementHandler("boolean", BooleanElementHandler.class); // NON-NLS: the element name
// some handlers for new elements
setElementHandler("new", NewElementHandler.class); // NON-NLS: the element name
setElementHandler("var", VarElementHandler.class); // NON-NLS: the element name
setElementHandler("true", TrueElementHandler.class); // NON-NLS: the element name
setElementHandler("false", FalseElementHandler.class); // NON-NLS: the element name
setElementHandler("field", FieldElementHandler.class); // NON-NLS: the element name
setElementHandler("method", MethodElementHandler.class); // NON-NLS: the element name
setElementHandler("property", PropertyElementHandler.class); // NON-NLS: the element name
}
/**
* Returns the class loader used to instantiate objects.
* If the class loader has not been explicitly set
* then {@code null} is returned.
*
* @return the class loader used to instantiate objects
*/
public ClassLoader getClassLoader() {
return (this.loader != null)
? this.loader.get()
: null;
}
/**
* Sets the class loader used to instantiate objects.
* If the class loader is not set
* then default class loader will be used.
*
* @param loader a classloader to use
*/
public void setClassLoader(ClassLoader loader) {
this.loader = new WeakReference(loader);
}
/**
* Returns the exception listener for parsing.
* The exception listener is notified
* when handler catches recoverable exceptions.
* If the exception listener has not been explicitly set
* then default exception listener is returned.
*
* @return the exception listener for parsing
*/
public ExceptionListener getExceptionListener() {
return this.listener;
}
/**
* Sets the exception listener for parsing.
* The exception listener is notified
* when handler catches recoverable exceptions.
*
* @param listener the exception listener for parsing
*/
public void setExceptionListener(ExceptionListener listener) {
this.listener = listener;
}
/**
* Returns the owner of this document handler.
*
* @return the owner of this document handler
*/
public Object getOwner() {
return this.owner;
}
/**
* Sets the owner of this document handler.
*
* @param owner the owner of this document handler
*/
public void setOwner(Object owner) {
this.owner = owner;
}
/**
* Returns the handler for the element with specified name.
*
* @param name the name of the element
* @return the corresponding element handler
*/
public Class getElementHandler(String name) {
Class type = this.handlers.get(name);
if (type == null) {
throw new IllegalArgumentException("Unsupported element: " + name);
}
return type;
}
/**
* Sets the handler for the element with specified name.
*
* @param name the name of the element
* @param handler the corresponding element handler
*/
public void setElementHandler(String name, Class handler) {
this.handlers.put(name, handler);
}
/**
* Indicates whether the variable with specified identifier is defined.
*
* @param id the identifier
* @return true if the variable is defined; false otherwise
*/
public boolean hasVariable(String id) {
return this.environment.containsKey(id);
}
/**
* Returns the value of the variable with specified identifier.
*
* @param id the identifier
* @return the value of the variable
*/
public Object getVariable(String id) {
if (!this.environment.containsKey(id)) {
throw new IllegalArgumentException("Unbound variable: " + id);
}
return this.environment.get(id);
}
/**
* Sets new value of the variable with specified identifier.
*
* @param id the identifier
* @param value new value of the variable
*/
public void setVariable(String id, Object value) {
this.environment.put(id, value);
}
/**
* Returns the array of readed objects.
*
* @return the array of readed objects
*/
public Object[] getObjects() {
return this.objects.toArray();
}
/**
* Adds the object to the list of readed objects.
*
* @param object the object that is readed from XML document
*/
void addObject(Object object) {
this.objects.add(object);
}
/**
* Prepares this handler to read objects from XML document.
*/
@Override
public void startDocument() {
this.objects.clear();
this.handler = null;
}
/**
* Parses opening tag of XML element
* using corresponding element handler.
*
* @param uri the namespace URI, or the empty string
* if the element has no namespace URI or
* if namespace processing is not being performed
* @param localName the local name (without prefix), or the empty string
* if namespace processing is not being performed
* @param qName the qualified name (with prefix), or the empty string
* if qualified names are not available
* @param attributes the attributes attached to the element
*/
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
ElementHandler parent = this.handler;
try {
this.handler = getElementHandler(qName).newInstance();
this.handler.setOwner(this);
this.handler.setParent(parent);
}
catch (Exception exception) {
throw new SAXException(exception);
}
for (int i = 0; i < attributes.getLength(); i++)
try {
String name = attributes.getQName(i);
String value = attributes.getValue(i);
this.handler.addAttribute(name, value);
}
catch (RuntimeException exception) {
handleException(exception);
}
this.handler.startElement();
}
/**
* Parses closing tag of XML element
* using corresponding element handler.
*
* @param uri the namespace URI, or the empty string
* if the element has no namespace URI or
* if namespace processing is not being performed
* @param localName the local name (without prefix), or the empty string
* if namespace processing is not being performed
* @param qName the qualified name (with prefix), or the empty string
* if qualified names are not available
*/
@Override
public void endElement(String uri, String localName, String qName) {
try {
this.handler.endElement();
}
catch (RuntimeException exception) {
handleException(exception);
}
finally {
this.handler = this.handler.getParent();
}
}
/**
* Parses character data inside XML element.
*
* @param chars the array of characters
* @param start the start position in the character array
* @param length the number of characters to use
*/
@Override
public void characters(char[] chars, int start, int length) {
if (this.handler != null) {
try {
while (0 < length--) {
this.handler.addCharacter(chars[start++]);
}
}
catch (RuntimeException exception) {
handleException(exception);
}
}
}
/**
* Handles an exception using current exception listener.
*
* @param exception an exception to handle
* @see #setExceptionListener
*/
public void handleException(Exception exception) {
if (this.listener == null) {
throw new IllegalStateException(exception);
}
this.listener.exceptionThrown(exception);
}
/**
* Starts parsing of the specified input source.
*
* @param input the input source to parse
*/
public void parse(InputSource input) {
try {
SAXParserFactory factory = new org.apache.xerces.jaxp.SAXParserFactoryImpl();
factory.newSAXParser().parse(input, this);
}
catch (ParserConfigurationException exception) {
handleException(exception);
}
catch (SAXException wrapper) {
Exception exception = wrapper.getException();
if (exception == null) {
exception = wrapper;
}
handleException(exception);
}
catch (IOException exception) {
handleException(exception);
}
}
/**
* Resolves class by name using current class loader.
* This method handles exception using current exception listener.
*
* @param name the name of the class
* @return the object that represents the class
*/
public Class findClass(String name) {
try {
if (loader != null) {
try {
return Class.forName(name, false, loader.get());
} catch (ClassNotFoundException exception) {
// use default class loader instead
} catch (SecurityException exception) {
// use default class loader instead
}
}
return Class.forName(name);
}
catch (ClassNotFoundException exception) {
handleException(exception);
return null;
}
}
}
