containutil.java

来自「webwork source」· Java 代码 · 共 58 行

/*
* WebWork, Web Application Framework
*
* Distributable under Apache license.
* See terms of license at opensource.org
*/
package webwork.util;

import org.apache.commons.logging.*;

import java.util.Map;
import java.util.Collection;
import java.lang.reflect.Array;

/**
 * <code>ContainUtil</code> will check if object 1 contains object 2.
 * Object 1 may be an Object, array, Collection, or a Map
 *
 * @author Matt Baldree ([e-mail])
 * @version $Revision: 1.5 $
 */
public class ContainUtil {
   private static final Log log = LogFactory.getLog(ContainUtil.class);

   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).containsValue(obj2)) {
            //log.debug("obj1 is a map and contains obj2");
            return true;
         }
      } else if (obj1 instanceof Collection) {
         if (((Collection)obj1).contains(obj2)) {
            //log.debug("obj1 is a collection and contains obj2");
            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 (value.equals(obj2)) {
               //log.debug("obj1 is an array and contains obj2");
               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;
   }
}