/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* 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 br.com.caelum.vraptor.http.ognl;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.util.Map;
import net.vidageek.mirror.dsl.Mirror;
import ognl.ArrayPropertyAccessor;
import ognl.OgnlContext;
import ognl.OgnlException;
import br.com.caelum.vraptor.vraptor2.Info;
/**
* Deals with acessing values within an array.<br>
* Re-instantiates and invokes setter methods on arrays as soon as they are not
* big enough for all required parameters.
*
* @author Guilherme Silveira
*/
public class ArrayAccessor extends ArrayPropertyAccessor {
@SuppressWarnings("unchecked")
@Override
public Object getProperty(Map context, Object target, Object object) throws OgnlException {
try {
return super.getProperty(context, target, object);
} catch (IndexOutOfBoundsException ex) {
return null;
}
}
@SuppressWarnings("unchecked")
@Override
public void setProperty(Map context, Object array, Object key, Object value) throws OgnlException {
int index = (Integer) key;
int length = Array.getLength(array);
if (length <= index) {
Object newArray = copyOf(array, index, length);
OgnlContext ctx = (OgnlContext) context;
if (array == ctx.getRoot()) {
ctx.setRoot(newArray);
} else {
String fieldName = ctx.getCurrentEvaluation().getPrevious().getNode().toString();
Object origin = ctx.getCurrentEvaluation().getPrevious().getSource();
Method setter = ReflectionBasedNullHandler.findMethod(origin.getClass(),
"set" + Info.capitalize(fieldName), origin.getClass(), null);
EmptyElementsRemoval removal = (EmptyElementsRemoval) context.get("removal");
removal.add(newArray, setter, origin);
new Mirror().on(origin).invoke().method(setter).withArgs(newArray);
}
array = newArray;
}
super.setProperty(context, array, key, value);
}
private Object copyOf(Object array, int desiredLength, int currentLength) {
Object newArray = Array.newInstance(array.getClass().getComponentType(), desiredLength + 1);
for (int i = 0; i < currentLength; i++) {
Array.set(newArray, i, Array.get(array, i));
}
for (int i = currentLength; i < desiredLength; i++) {
Array.set(newArray, i, null);
}
array = newArray;
return array;
}
}