mirror of
https://codeberg.org/Mercury-IM/Smack
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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2408 b35dd754-fafc-0310-a699-88a17e54d16e
153 lines
5.7 KiB
Java
153 lines
5.7 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright 2003-2004 Jive Software.
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*
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util;
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import java.beans.PropertyDescriptor;
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import org.jivesoftware.smack.packet.DefaultPacketExtension;
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import org.jivesoftware.smack.packet.PacketExtension;
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import org.jivesoftware.smack.provider.PacketExtensionProvider;
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import org.jivesoftware.smack.provider.ProviderManager;
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import org.xmlpull.v1.XmlPullParser;
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/**
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* Utility class that helps to parse packets. Any parsing packets method that must be shared
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* between many clients must be placed in this utility class.
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*
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* @author Gaston Dombiak
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*/
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public class PacketParserUtils {
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/**
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* Parses a packet extension sub-packet.
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*
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* @param elementName the XML element name of the packet extension.
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* @param namespace the XML namespace of the packet extension.
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* @param parser the XML parser, positioned at the starting element of the extension.
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* @return a PacketExtension.
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* @throws Exception if a parsing error occurs.
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*/
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public static PacketExtension parsePacketExtension(String elementName, String namespace, XmlPullParser parser)
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throws Exception
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{
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// See if a provider is registered to handle the extension.
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Object provider = ProviderManager.getExtensionProvider(elementName, namespace);
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if (provider != null) {
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if (provider instanceof PacketExtensionProvider) {
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return ((PacketExtensionProvider)provider).parseExtension(parser);
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}
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else if (provider instanceof Class) {
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return (PacketExtension)parseWithIntrospection(
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elementName, (Class)provider, parser);
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}
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}
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// No providers registered, so use a default extension.
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DefaultPacketExtension extension = new DefaultPacketExtension(elementName, namespace);
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boolean done = false;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String name = parser.getName();
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// If an empty element, set the value with the empty string.
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if (parser.isEmptyElementTag()) {
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extension.setValue(name,"");
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}
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// Otherwise, get the the element text.
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else {
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eventType = parser.next();
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if (eventType == XmlPullParser.TEXT) {
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String value = parser.getText();
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extension.setValue(name, value);
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}
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals(elementName)) {
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done = true;
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}
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}
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}
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return extension;
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}
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public static Object parseWithIntrospection(String elementName,
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Class objectClass, XmlPullParser parser) throws Exception
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{
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boolean done = false;
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Object object = objectClass.newInstance();
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String name = parser.getName();
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String stringValue = parser.nextText();
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PropertyDescriptor descriptor = new PropertyDescriptor(name, objectClass);
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// Load the class type of the property.
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Class propertyType = descriptor.getPropertyType();
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// Get the value of the property by converting it from a
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// String to the correct object type.
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Object value = decode(propertyType, stringValue);
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// Set the value of the bean.
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descriptor.getWriteMethod().invoke(object, new Object[] { value });
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals(elementName)) {
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done = true;
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}
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}
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}
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return object;
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}
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/**
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* Decodes a String into an object of the specified type. If the object
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* type is not supported, null will be returned.
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*
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* @param type the type of the property.
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* @param value the encode String value to decode.
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* @return the String value decoded into the specified type.
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*/
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private static Object decode(Class type, String value) throws Exception {
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if (type.getName().equals("java.lang.String")) {
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return value;
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}
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if (type.getName().equals("boolean")) {
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return Boolean.valueOf(value);
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}
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if (type.getName().equals("int")) {
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return Integer.valueOf(value);
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}
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if (type.getName().equals("long")) {
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return Long.valueOf(value);
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}
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if (type.getName().equals("float")) {
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return Float.valueOf(value);
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}
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if (type.getName().equals("double")) {
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return Double.valueOf(value);
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}
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if (type.getName().equals("java.lang.Class")) {
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return Class.forName(value);
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}
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return null;
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}
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}
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