/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* 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 com.alibaba.citrus.generictype.introspect.impl;
import java.util.Map;
import com.alibaba.citrus.generictype.ClassTypeInfo;
import com.alibaba.citrus.generictype.MethodInfo;
import com.alibaba.citrus.generictype.TypeInfo;
import com.alibaba.citrus.generictype.introspect.IndexedPropertyInfo;
import com.alibaba.citrus.generictype.introspect.PropertyEvaluationFailureException;
import com.alibaba.citrus.generictype.introspect.PropertyInfo;
/**
* 分析<code>Map</code>，将map看作mapped属性来操作。
*
* @author Michael Zhou
*/
public class MapPropertiesFinder extends SinglePropertyFinder {
@Override
protected PropertyInfo createPropertyInfo(TypeInfo type) {
if (type instanceof ClassTypeInfo && Map.class.isAssignableFrom(type.getRawType())) {
MethodInfo writeMethod = ((ClassTypeInfo) type).getMethod("put", Object.class, Object.class);
Class<?> keyType = writeMethod.getParameterTypes().get(0).getRawType();
if (keyType.isAssignableFrom(String.class)) {
MethodInfo readMethod = ((ClassTypeInfo) type).getMethod("get", Object.class);
TypeInfo propertyType = writeMethod.getParameterTypes().get(1);
return new MapPropertyImpl(readMethod.getDeclaringType(), propertyType, readMethod, writeMethod);
}
}
return null;
}
/** 代表一个map的属性信息。 */
private static class MapPropertyImpl extends AbstractPropertyInfo implements IndexedPropertyInfo {
private MapPropertyImpl(TypeInfo declaringType, TypeInfo type, MethodInfo readMethod, MethodInfo writeMethod) {
super(null, declaringType, type, readMethod, writeMethod);
}
public Object getValue(Object object, int index) {
try {
return ((Map<?, ?>) object).get(index);
} catch (Exception e) {
throw new PropertyEvaluationFailureException(e);
}
}
@Override
public void setValue(Object object, int index, Object value) {
}
@Override
protected String getDescription() {
return "MappedProperty (Map)";
}
}
}