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Java > Open Source Codes > com > ibatis > sqlmap > engine > mapping > sql > dynamic > elements > IsEmptyTagHandler


1 /*
2  * Copyright 2004 Clinton Begin
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.ibatis.sqlmap.engine.mapping.sql.dynamic.elements;
17
18 import com.ibatis.common.beans.Probe;
19 import com.ibatis.common.beans.ProbeFactory;
20
21 import java.lang.reflect.Array JavaDoc;
22 import java.util.Collection JavaDoc;
23
24 public class IsEmptyTagHandler extends ConditionalTagHandler {
25
26   private static final Probe PROBE = ProbeFactory.getProbe();
27
28   public boolean isCondition(SqlTagContext ctx, SqlTag tag, Object JavaDoc parameterObject) {
29     if (parameterObject == null) {
30       return true;
31     } else {
32       String JavaDoc prop = tag.getPropertyAttr();
33       Object JavaDoc value;
34       if (prop != null) {
35         value = PROBE.getObject(parameterObject, prop);
36       } else {
37         value = parameterObject;
38       }
39       if (value instanceof Collection JavaDoc) {
40         return value == null || ((Collection JavaDoc) value).size() < 1;
41       } else if (value != null && value.getClass().isArray()) {
42         return Array.getLength(value) == 0;
43       } else {
44         return value == null || String.valueOf(value).equals("");
45       }
46     }
47   }
48
49 }
50
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