/*
* Copyright 2001-2004 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.axis.encoding.ser;
import org.apache.axis.Constants;
import org.apache.axis.components.logger.LogFactory;
import org.apache.axis.encoding.Deserializer;
import org.apache.axis.encoding.DeserializerFactory;
import org.apache.axis.i18n.Messages;
import org.apache.commons.logging.Log;
import javax.xml.namespace.QName;
import javax.xml.rpc.JAXRPCException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.Vector;
/**
* Base class for Axis Deserialization Factory classes for code reuse
*
* @author Rich Scheuerle <scheu@us.ibm.com>
*/
public abstract class BaseDeserializerFactory extends BaseFactory
implements DeserializerFactory {
protected static Log log =
LogFactory.getLog(BaseDeserializerFactory.class.getName());
transient static Vector mechanisms = null;
protected Class deserClass = null;
protected QName xmlType = null;
protected Class javaType = null;
transient protected Constructor deserClassConstructor = null;
transient protected Method getDeserializer = null;
/**
* Constructor
* @param deserClass is the class of the Deserializer
*/
public BaseDeserializerFactory(Class deserClass) {
if (!Deserializer.class.isAssignableFrom(deserClass)) {
throw new ClassCastException(
Messages.getMessage("BadImplementation00",
deserClass.getName(),
Deserializer.class.getName()));
}
this.deserClass = deserClass;
mechanisms = new Vector();
mechanisms.add(Constants.AXIS_SAX);
}
public BaseDeserializerFactory(Class deserClass,
QName xmlType,
Class javaType) {
this(deserClass);
this.xmlType = xmlType;
this.javaType = javaType;
}
public javax.xml.rpc.encoding.Deserializer
getDeserializerAs(String mechanismType)
throws JAXRPCException {
Deserializer deser = null;
// Need to add code to check against mechanisms vector.
// Try getting a specialized Deserializer
deser = getSpecialized(mechanismType);
// Try getting a general purpose Deserializer via constructor
// invocation
if (deser == null) {
deser = getGeneralPurpose(mechanismType);
}
try {
// If not successfull, try newInstance
if (deser == null) {
deser = (Deserializer) deserClass.newInstance();
}
} catch (Exception e) {
throw new JAXRPCException(e);
}
return deser;
}
/**
* Obtains a deserializer by invoking <constructor>(javaType, xmlType)
* on the deserClass.
*/
protected Deserializer getGeneralPurpose(String mechanismType) {
if (javaType != null && xmlType != null) {
Constructor deserClassConstructor = getDeserClassConstructor();
if (deserClassConstructor != null) {
try {
return (Deserializer)
deserClassConstructor.newInstance(
new Object[] {javaType, xmlType});
} catch (InstantiationException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (IllegalAccessException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (InvocationTargetException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
}
}
}
return null;
}
private static final Class[] CLASS_QNAME_CLASS = new Class[] {Class.class, QName.class};
/**
* return constructor for class if any
*/
private Constructor getConstructor(Class clazz) {
try {
return clazz.getConstructor(CLASS_QNAME_CLASS);
} catch (NoSuchMethodException e) {}
return null;
}
/**
* Obtains a deserializer by invoking getDeserializer method in the
* javaType class or its Helper class.
*/
protected Deserializer getSpecialized(String mechanismType) {
if (javaType != null && xmlType != null) {
Method getDeserializer = getGetDeserializer();
if (getDeserializer != null) {
try {
return (Deserializer)
getDeserializer.invoke(
null,
new Object[] {mechanismType,
javaType,
xmlType});
} catch (IllegalAccessException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (InvocationTargetException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
}
}
}
return null;
}
/**
* Returns a list of all XML processing mechanism types supported by this DeserializerFactory.
*
* @return List of unique identifiers for the supported XML processing mechanism types
*/
public Iterator getSupportedMechanismTypes() {
return mechanisms.iterator();
}
/**
* Utility method that intospects on a factory class to decide how to
* create the factory. Tries in the following order:
* public static create(Class javaType, QName xmlType)
* public <constructor>(Class javaType, QName xmlType)
* public <constructor>()
* @param factory class
* @param javaType
* @param xmlType
*/
public static DeserializerFactory createFactory(Class factory,
Class javaType,
QName xmlType) {
if (factory == null) {
return null;
}
DeserializerFactory df = null;
try {
Method method =
factory.getMethod("create", CLASS_QNAME_CLASS);
df = (DeserializerFactory)
method.invoke(null,
new Object[] {javaType, xmlType});
} catch (NoSuchMethodException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (IllegalAccessException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (InvocationTargetException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
}
if (df == null) {
try {
Constructor constructor =
factory.getConstructor(CLASS_QNAME_CLASS);
df = (DeserializerFactory)
constructor.newInstance(
new Object[] {javaType, xmlType});
} catch (NoSuchMethodException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (InstantiationException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (IllegalAccessException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
} catch (InvocationTargetException e) {
if(log.isDebugEnabled()) {
log.debug(org.apache.axis.utils.Messages.getMessage("exception00"), e);
}
}
}
if (df == null) {
try {
df = (DeserializerFactory) factory.newInstance();
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {}
}
return df;
}
/**
* Returns the deserClassConstructor.
* @return Constructor
*/
protected Constructor getDeserClassConstructor() {
if (deserClassConstructor == null) {
deserClassConstructor = getConstructor(deserClass);
}
return deserClassConstructor;
}
/**
* Returns the getDeserializer.
* @return Method
*/
protected Method getGetDeserializer() {
if (getDeserializer == null) {
getDeserializer = getMethod(javaType,"getDeserializer");
}
return getDeserializer;
}
}