/*
* $Id: ContainUtil.java 802937 2009-08-10 21:57:37Z musachy $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.struts2.util;
import java.lang.reflect.Array;
import java.util.Iterator;
import java.util.Map;
/**
* <code>ContainUtil</code> will check if object 1 contains object 2.
* Object 1 may be an Object, array, Collection, or a Map
*
* @version $Date: 2009-08-10 21:57:37 +0000 (Mon, 10 Aug 2009) $ $Id: ContainUtil.java 802937 2009-08-10 21:57:37Z musachy $
*/
public class ContainUtil {
/**
* Determine if <code>obj2</code> exists in <code>obj1</code>.
*
* <table borer="1">
* <tr>
* <td>Type Of obj1</td>
* <td>Comparison type</td>
* </tr>
* <tr>
* <td>null<td>
* <td>always return false</td>
* </tr>
* <tr>
* <td>Map</td>
* <td>Map containsKey(obj2)</td>
* </tr>
* <tr>
* <td>Collection</td>
* <td>Collection contains(obj2)</td>
* </tr>
* <tr>
* <td>Array</td>
* <td>there's an array element (e) where e.equals(obj2)</td>
* </tr>
* <tr>
* <td>Object</td>
* <td>obj1.equals(obj2)</td>
* </tr>
* </table>
*
*
* @param obj1
* @param obj2
* @return
*/
public static boolean contains(Object obj1, Object obj2) {
if ((obj1 == null) || (obj2 == null)) {
//log.debug("obj1 or obj2 are null.");
return false;
}
if (obj1 instanceof Map) {
if (((Map) obj1).containsKey(obj2)) {
//log.debug("obj1 is a map and contains obj2");
return true;
}
} if (obj1 instanceof Iterable) {
Iterator iter = ((Iterable) obj1).iterator();
while(iter.hasNext()) {
Object value = iter.next();
if (obj2.equals(value) || obj2.toString().equals(value)) {
return true;
}
}
} else if (obj1.getClass().isArray()) {
for (int i = 0; i < Array.getLength(obj1); i++) {
Object value = null;
value = Array.get(obj1, i);
if (obj2.equals(value)) {
//log.debug("obj1 is an array and contains obj2");
return true;
}
}
} else if (obj1.toString().equals(obj2.toString())) {
//log.debug("obj1 is an object and it's String representation equals obj2's String representation.");
return true;
} else if (obj1.equals(obj2)) {
//log.debug("obj1 is an object and equals obj2");
return true;
}
//log.debug("obj1 does not contain obj2: " + obj1 + ", " + obj2);
return false;
}
}
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