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Smack/source/org/jivesoftware/smack/util/PacketParserUtils.java

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/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2007 Jive Software.
*
* All rights reserved. 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.jivesoftware.smack.util;
import java.beans.PropertyDescriptor;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.packet.Authentication;
import org.jivesoftware.smack.packet.Bind;
import org.jivesoftware.smack.packet.DefaultPacketExtension;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.packet.Registration;
import org.jivesoftware.smack.packet.RosterPacket;
import org.jivesoftware.smack.packet.StreamError;
import org.jivesoftware.smack.packet.XMPPError;
import org.jivesoftware.smack.provider.IQProvider;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.jivesoftware.smack.provider.ProviderManager;
import org.jivesoftware.smack.sasl.SASLMechanism.Failure;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
/**
* Utility class that helps to parse packets. Any parsing packets method that must be shared
* between many clients must be placed in this utility class.
*
* @author Gaston Dombiak
*/
public class PacketParserUtils {
/**
* Namespace used to store packet properties.
*/
private static final String PROPERTIES_NAMESPACE =
"http://www.jivesoftware.com/xmlns/xmpp/properties";
/**
* Parses a message packet.
*
* @param parser the XML parser, positioned at the start of a message packet.
* @return a Message packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
public static Packet parseMessage(XmlPullParser parser) throws Exception {
Message message = new Message();
String id = parser.getAttributeValue("", "id");
message.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
message.setTo(parser.getAttributeValue("", "to"));
message.setFrom(parser.getAttributeValue("", "from"));
message.setType(Message.Type.fromString(parser.getAttributeValue("", "type")));
String language = getLanguageAttribute(parser);
// determine message's default language
String defaultLanguage = null;
if (language != null && !"".equals(language.trim())) {
message.setLanguage(language);
defaultLanguage = language;
}
else {
defaultLanguage = Packet.getDefaultLanguage();
}
// Parse sub-elements. We include extra logic to make sure the values
// are only read once. This is because it's possible for the names to appear
// in arbitrary sub-elements.
boolean done = false;
String thread = null;
Map<String, Object> properties = null;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (elementName.equals("subject")) {
String xmlLang = getLanguageAttribute(parser);
if (xmlLang == null) {
xmlLang = defaultLanguage;
}
String subject = parseContent(parser);
if (message.getSubject(xmlLang) == null) {
message.addSubject(xmlLang, subject);
}
}
else if (elementName.equals("body")) {
String xmlLang = getLanguageAttribute(parser);
if (xmlLang == null) {
xmlLang = defaultLanguage;
}
String body = parseContent(parser);
if (message.getBody(xmlLang) == null) {
message.addBody(xmlLang, body);
}
}
else if (elementName.equals("thread")) {
if (thread == null) {
thread = parser.nextText();
}
}
else if (elementName.equals("error")) {
message.setError(parseError(parser));
}
else if (elementName.equals("properties") &&
namespace.equals(PROPERTIES_NAMESPACE))
{
properties = parseProperties(parser);
}
// Otherwise, it must be a packet extension.
else {
message.addExtension(
PacketParserUtils.parsePacketExtension(elementName, namespace, parser));
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("message")) {
done = true;
}
}
}
message.setThread(thread);
// Set packet properties.
if (properties != null) {
for (String name : properties.keySet()) {
message.setProperty(name, properties.get(name));
}
}
return message;
}
/**
* Returns the content of a tag as string regardless of any tags included.
*
* @param parser the XML pull parser
* @return the content of a tag as string
* @throws XmlPullParserException if parser encounters invalid XML
* @throws IOException if an IO error occurs
*/
private static String parseContent(XmlPullParser parser)
throws XmlPullParserException, IOException {
String content = "";
int parserDepth = parser.getDepth();
while (!(parser.next() == XmlPullParser.END_TAG && parser
.getDepth() == parserDepth)) {
content += parser.getText();
}
return content;
}
/**
* Parses a presence packet.
*
* @param parser the XML parser, positioned at the start of a presence packet.
* @return a Presence packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
public static Presence parsePresence(XmlPullParser parser) throws Exception {
Presence.Type type = Presence.Type.available;
String typeString = parser.getAttributeValue("", "type");
if (typeString != null && !typeString.equals("")) {
try {
type = Presence.Type.valueOf(typeString);
}
catch (IllegalArgumentException iae) {
System.err.println("Found invalid presence type " + typeString);
}
}
Presence presence = new Presence(type);
presence.setTo(parser.getAttributeValue("", "to"));
presence.setFrom(parser.getAttributeValue("", "from"));
String id = parser.getAttributeValue("", "id");
presence.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
String language = getLanguageAttribute(parser);
if (language != null && !"".equals(language.trim())) {
presence.setLanguage(language);
}
presence.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
// Parse sub-elements
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (elementName.equals("status")) {
presence.setStatus(parser.nextText());
}
else if (elementName.equals("priority")) {
try {
int priority = Integer.parseInt(parser.nextText());
presence.setPriority(priority);
}
catch (NumberFormatException nfe) {
// Ignore.
}
catch (IllegalArgumentException iae) {
// Presence priority is out of range so assume priority to be zero
presence.setPriority(0);
}
}
else if (elementName.equals("show")) {
String modeText = parser.nextText();
try {
presence.setMode(Presence.Mode.valueOf(modeText));
}
catch (IllegalArgumentException iae) {
System.err.println("Found invalid presence mode " + modeText);
}
}
else if (elementName.equals("error")) {
presence.setError(parseError(parser));
}
else if (elementName.equals("properties") &&
namespace.equals(PROPERTIES_NAMESPACE))
{
Map<String,Object> properties = parseProperties(parser);
// Set packet properties.
for (String name : properties.keySet()) {
presence.setProperty(name, properties.get(name));
}
}
// Otherwise, it must be a packet extension.
else {
try {
presence.addExtension(PacketParserUtils.parsePacketExtension(elementName, namespace, parser));
}
catch (Exception e) {
System.err.println("Failed to parse extension packet in Presence packet.");
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("presence")) {
done = true;
}
}
}
return presence;
}
/**
* Parses an IQ packet.
*
* @param parser the XML parser, positioned at the start of an IQ packet.
* @return an IQ object.
* @throws Exception if an exception occurs while parsing the packet.
*/
public static IQ parseIQ(XmlPullParser parser, Connection connection) throws Exception {
IQ iqPacket = null;
String id = parser.getAttributeValue("", "id");
String to = parser.getAttributeValue("", "to");
String from = parser.getAttributeValue("", "from");
IQ.Type type = IQ.Type.fromString(parser.getAttributeValue("", "type"));
XMPPError error = null;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (elementName.equals("error")) {
error = PacketParserUtils.parseError(parser);
}
else if (elementName.equals("query") && namespace.equals("jabber:iq:auth")) {
iqPacket = parseAuthentication(parser);
}
else if (elementName.equals("query") && namespace.equals("jabber:iq:roster")) {
iqPacket = parseRoster(parser);
}
else if (elementName.equals("query") && namespace.equals("jabber:iq:register")) {
iqPacket = parseRegistration(parser);
}
else if (elementName.equals("bind") &&
namespace.equals("urn:ietf:params:xml:ns:xmpp-bind")) {
iqPacket = parseResourceBinding(parser);
}
// Otherwise, see if there is a registered provider for
// this element name and namespace.
else {
Object provider = ProviderManager.getInstance().getIQProvider(elementName, namespace);
if (provider != null) {
if (provider instanceof IQProvider) {
iqPacket = ((IQProvider)provider).parseIQ(parser);
}
else if (provider instanceof Class) {
iqPacket = (IQ)PacketParserUtils.parseWithIntrospection(elementName,
(Class<?>)provider, parser);
}
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("iq")) {
done = true;
}
}
}
// Decide what to do when an IQ packet was not understood
if (iqPacket == null) {
if (IQ.Type.GET == type || IQ.Type.SET == type ) {
// If the IQ stanza is of type "get" or "set" containing a child element
// qualified by a namespace it does not understand, then answer an IQ of
// type "error" with code 501 ("feature-not-implemented")
iqPacket = new IQ() {
public String getChildElementXML() {
return null;
}
};
iqPacket.setPacketID(id);
iqPacket.setTo(from);
iqPacket.setFrom(to);
iqPacket.setType(IQ.Type.ERROR);
iqPacket.setError(new XMPPError(XMPPError.Condition.feature_not_implemented));
connection.sendPacket(iqPacket);
return null;
}
else {
// If an IQ packet wasn't created above, create an empty IQ packet.
iqPacket = new IQ() {
public String getChildElementXML() {
return null;
}
};
}
}
// Set basic values on the iq packet.
iqPacket.setPacketID(id);
iqPacket.setTo(to);
iqPacket.setFrom(from);
iqPacket.setType(type);
iqPacket.setError(error);
return iqPacket;
}
private static Authentication parseAuthentication(XmlPullParser parser) throws Exception {
Authentication authentication = new Authentication();
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("username")) {
authentication.setUsername(parser.nextText());
}
else if (parser.getName().equals("password")) {
authentication.setPassword(parser.nextText());
}
else if (parser.getName().equals("digest")) {
authentication.setDigest(parser.nextText());
}
else if (parser.getName().equals("resource")) {
authentication.setResource(parser.nextText());
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("query")) {
done = true;
}
}
}
return authentication;
}
private static RosterPacket parseRoster(XmlPullParser parser) throws Exception {
RosterPacket roster = new RosterPacket();
boolean done = false;
RosterPacket.Item item = null;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("item")) {
String jid = parser.getAttributeValue("", "jid");
String name = parser.getAttributeValue("", "name");
// Create packet.
item = new RosterPacket.Item(jid, name);
// Set status.
String ask = parser.getAttributeValue("", "ask");
RosterPacket.ItemStatus status = RosterPacket.ItemStatus.fromString(ask);
item.setItemStatus(status);
// Set type.
String subscription = parser.getAttributeValue("", "subscription");
RosterPacket.ItemType type = RosterPacket.ItemType.valueOf(subscription != null ? subscription : "none");
item.setItemType(type);
}
if (parser.getName().equals("group") && item!= null) {
final String groupName = parser.nextText();
if (groupName != null && groupName.trim().length() > 0) {
item.addGroupName(groupName);
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("item")) {
roster.addRosterItem(item);
}
if (parser.getName().equals("query")) {
done = true;
}
}
}
return roster;
}
private static Registration parseRegistration(XmlPullParser parser) throws Exception {
Registration registration = new Registration();
Map<String, String> fields = null;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
// Any element that's in the jabber:iq:register namespace,
// attempt to parse it if it's in the form <name>value</name>.
if (parser.getNamespace().equals("jabber:iq:register")) {
String name = parser.getName();
String value = "";
if (fields == null) {
fields = new HashMap<String, String>();
}
if (parser.next() == XmlPullParser.TEXT) {
value = parser.getText();
}
// Ignore instructions, but anything else should be added to the map.
if (!name.equals("instructions")) {
fields.put(name, value);
}
else {
registration.setInstructions(value);
}
}
// Otherwise, it must be a packet extension.
else {
registration.addExtension(
PacketParserUtils.parsePacketExtension(
parser.getName(),
parser.getNamespace(),
parser));
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("query")) {
done = true;
}
}
}
registration.setAttributes(fields);
return registration;
}
private static Bind parseResourceBinding(XmlPullParser parser) throws IOException,
XmlPullParserException {
Bind bind = new Bind();
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("resource")) {
bind.setResource(parser.nextText());
}
else if (parser.getName().equals("jid")) {
bind.setJid(parser.nextText());
}
} else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("bind")) {
done = true;
}
}
}
return bind;
}
/**
* Parse the available SASL mechanisms reported from the server.
*
* @param parser the XML parser, positioned at the start of the mechanisms stanza.
* @return a collection of Stings with the mechanisms included in the mechanisms stanza.
* @throws Exception if an exception occurs while parsing the stanza.
*/
public static Collection<String> parseMechanisms(XmlPullParser parser) throws Exception {
List<String> mechanisms = new ArrayList<String>();
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
if (elementName.equals("mechanism")) {
mechanisms.add(parser.nextText());
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("mechanisms")) {
done = true;
}
}
}
return mechanisms;
}
/**
* Parse the available compression methods reported from the server.
*
* @param parser the XML parser, positioned at the start of the compression stanza.
* @return a collection of Stings with the methods included in the compression stanza.
* @throws Exception if an exception occurs while parsing the stanza.
*/
public static Collection<String> parseCompressionMethods(XmlPullParser parser)
throws IOException, XmlPullParserException {
List<String> methods = new ArrayList<String>();
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
if (elementName.equals("method")) {
methods.add(parser.nextText());
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("compression")) {
done = true;
}
}
}
return methods;
}
/**
* Parse a properties sub-packet. If any errors occur while de-serializing Java object
* properties, an exception will be printed and not thrown since a thrown
* exception will shut down the entire connection. ClassCastExceptions will occur
* when both the sender and receiver of the packet don't have identical versions
* of the same class.
*
* @param parser the XML parser, positioned at the start of a properties sub-packet.
* @return a map of the properties.
* @throws Exception if an error occurs while parsing the properties.
*/
public static Map<String, Object> parseProperties(XmlPullParser parser) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>();
while (true) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG && parser.getName().equals("property")) {
// Parse a property
boolean done = false;
String name = null;
String type = null;
String valueText = null;
Object value = null;
while (!done) {
eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
if (elementName.equals("name")) {
name = parser.nextText();
}
else if (elementName.equals("value")) {
type = parser.getAttributeValue("", "type");
valueText = parser.nextText();
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("property")) {
if ("integer".equals(type)) {
value = Integer.valueOf(valueText);
}
else if ("long".equals(type)) {
value = Long.valueOf(valueText);
}
else if ("float".equals(type)) {
value = Float.valueOf(valueText);
}
else if ("double".equals(type)) {
value = Double.valueOf(valueText);
}
else if ("boolean".equals(type)) {
value = Boolean.valueOf(valueText);
}
else if ("string".equals(type)) {
value = valueText;
}
else if ("java-object".equals(type)) {
try {
byte [] bytes = StringUtils.decodeBase64(valueText);
ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes));
value = in.readObject();
}
catch (Exception e) {
e.printStackTrace();
}
}
if (name != null && value != null) {
properties.put(name, value);
}
done = true;
}
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("properties")) {
break;
}
}
}
return properties;
}
/**
* Parses SASL authentication error packets.
*
* @param parser the XML parser.
* @return a SASL Failure packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
public static Failure parseSASLFailure(XmlPullParser parser) throws Exception {
String condition = null;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (!parser.getName().equals("failure")) {
condition = parser.getName();
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("failure")) {
done = true;
}
}
}
return new Failure(condition);
}
/**
* Parses stream error packets.
*
* @param parser the XML parser.
* @return an stream error packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
public static StreamError parseStreamError(XmlPullParser parser) throws IOException,
XmlPullParserException {
StreamError streamError = null;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
streamError = new StreamError(parser.getName());
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("error")) {
done = true;
}
}
}
return streamError;
}
/**
* Parses error sub-packets.
*
* @param parser the XML parser.
* @return an error sub-packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
public static XMPPError parseError(XmlPullParser parser) throws Exception {
final String errorNamespace = "urn:ietf:params:xml:ns:xmpp-stanzas";
String errorCode = "-1";
String type = null;
String message = null;
String condition = null;
List<PacketExtension> extensions = new ArrayList<PacketExtension>();
// Parse the error header
for (int i=0; i<parser.getAttributeCount(); i++) {
if (parser.getAttributeName(i).equals("code")) {
errorCode = parser.getAttributeValue("", "code");
}
if (parser.getAttributeName(i).equals("type")) {
type = parser.getAttributeValue("", "type");
}
}
boolean done = false;
// Parse the text and condition tags
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("text")) {
message = parser.nextText();
}
else {
// Condition tag, it can be xmpp error or an application defined error.
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (errorNamespace.equals(namespace)) {
condition = elementName;
}
else {
extensions.add(parsePacketExtension(elementName, namespace, parser));
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("error")) {
done = true;
}
}
}
// Parse the error type.
XMPPError.Type errorType = XMPPError.Type.CANCEL;
try {
if (type != null) {
errorType = XMPPError.Type.valueOf(type.toUpperCase());
}
}
catch (IllegalArgumentException iae) {
// Print stack trace. We shouldn't be getting an illegal error type.
iae.printStackTrace();
}
return new XMPPError(Integer.parseInt(errorCode), errorType, condition, message, extensions);
}
/**
* Parses a packet extension sub-packet.
*
* @param elementName the XML element name of the packet extension.
* @param namespace the XML namespace of the packet extension.
* @param parser the XML parser, positioned at the starting element of the extension.
* @return a PacketExtension.
* @throws Exception if a parsing error occurs.
*/
public static PacketExtension parsePacketExtension(String elementName, String namespace, XmlPullParser parser)
throws Exception
{
// See if a provider is registered to handle the extension.
Object provider = ProviderManager.getInstance().getExtensionProvider(elementName, namespace);
if (provider != null) {
if (provider instanceof PacketExtensionProvider) {
return ((PacketExtensionProvider)provider).parseExtension(parser);
}
else if (provider instanceof Class) {
return (PacketExtension)parseWithIntrospection(
elementName, (Class<?>)provider, parser);
}
}
// No providers registered, so use a default extension.
DefaultPacketExtension extension = new DefaultPacketExtension(elementName, namespace);
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String name = parser.getName();
// If an empty element, set the value with the empty string.
if (parser.isEmptyElementTag()) {
extension.setValue(name,"");
}
// Otherwise, get the the element text.
else {
eventType = parser.next();
if (eventType == XmlPullParser.TEXT) {
String value = parser.getText();
extension.setValue(name, value);
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals(elementName)) {
done = true;
}
}
}
return extension;
}
private static String getLanguageAttribute(XmlPullParser parser) {
for (int i = 0; i < parser.getAttributeCount(); i++) {
String attributeName = parser.getAttributeName(i);
if ( "xml:lang".equals(attributeName) ||
("lang".equals(attributeName) &&
"xml".equals(parser.getAttributePrefix(i)))) {
return parser.getAttributeValue(i);
}
}
return null;
}
public static Object parseWithIntrospection(String elementName,
Class<?> objectClass, XmlPullParser parser) throws Exception
{
boolean done = false;
Object object = objectClass.newInstance();
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String name = parser.getName();
String stringValue = parser.nextText();
PropertyDescriptor descriptor = new PropertyDescriptor(name, objectClass);
// Load the class type of the property.
Class<?> propertyType = descriptor.getPropertyType();
// Get the value of the property by converting it from a
// String to the correct object type.
Object value = decode(propertyType, stringValue);
// Set the value of the bean.
descriptor.getWriteMethod().invoke(object, value);
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals(elementName)) {
done = true;
}
}
}
return object;
}
/**
* Decodes a String into an object of the specified type. If the object
* type is not supported, null will be returned.
*
* @param type the type of the property.
* @param value the encode String value to decode.
* @return the String value decoded into the specified type.
* @throws Exception If decoding failed due to an error.
*/
private static Object decode(Class<?> type, String value) throws Exception {
if (type.getName().equals("java.lang.String")) {
return value;
}
if (type.getName().equals("boolean")) {
return Boolean.valueOf(value);
}
if (type.getName().equals("int")) {
return Integer.valueOf(value);
}
if (type.getName().equals("long")) {
return Long.valueOf(value);
}
if (type.getName().equals("float")) {
return Float.valueOf(value);
}
if (type.getName().equals("double")) {
return Double.valueOf(value);
}
if (type.getName().equals("java.lang.Class")) {
return Class.forName(value);
}
return null;
}
}
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