/*
* Copyright 2010, 2011 Chris Pheby
*
* 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.jadira.bindings.core.general.unmarshaller;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import org.jadira.bindings.core.api.BindingException;
import org.jadira.bindings.core.api.FromUnmarshaller;
/**
* Unmarshaller supports constructor parameterised by a target object
* @param <S> Source type for the conversion
* @param <T> Target type
*/
public final class ConstructorFromUnmarshaller<S, T> implements FromUnmarshaller<S, T> {
private final Constructor<S> unmarshal;
private final Class<S> boundClass;
private final Class<T> targetClass;
/**
* Create a new instance
* @param unmarshal Constructor to be used
*/
public ConstructorFromUnmarshaller(Constructor<S> unmarshal) {
this.boundClass = unmarshal.getDeclaringClass();
if (getBoundClass().isInterface()
|| Modifier.isAbstract(getBoundClass().getModifiers())
|| getBoundClass().isLocalClass()
|| getBoundClass().isMemberClass()) {
throw new IllegalStateException("unmarshal constructor must have an instantiable target class");
}
if (unmarshal.getParameterTypes().length != 1) {
throw new IllegalStateException("unmarshal constructor must have a single parameter");
}
this.unmarshal = unmarshal;
@SuppressWarnings("unchecked")
Class<T> myTarget = (Class<T>)unmarshal.getParameterTypes()[0];
this.targetClass = myTarget;
}
/**
* {@inheritDoc}
*/
/* @Override */
public S unmarshal(T object) {
if (object != null && !targetClass.isAssignableFrom(object.getClass())) {
throw new IllegalArgumentException("Supplied object was not instance of target class");
}
try {
return unmarshal.newInstance(object);
} catch (IllegalAccessException ex) {
throw new IllegalStateException("Constructor is not accessible");
} catch (InstantiationException ex) {
throw new IllegalStateException("Constructor is not valid");
} catch (InvocationTargetException ex) {
if (ex.getCause() instanceof RuntimeException) {
throw (RuntimeException) ex.getCause();
}
throw new BindingException(ex.getMessage(), ex.getCause());
}
}
/**
* {@inheritDoc}
*/
/* @Override */
public Class<S> getBoundClass() {
return boundClass;
}
/**
* {@inheritDoc}
*/
/* @Override */
public Class<T> getTargetClass() {
return targetClass;
}
}