Source Code Cross Referenced for Else.java in  » Web-Framework » struts-2.0.11 » org » apache » struts2 » components » Java Source Code / Java DocumentationJava Source Code and Java Documentation

01:        /*
02:         * $Id: Else.java 497654 2007-01-19 00:21:57Z rgielen $
03:         *
04:         * Licensed to the Apache Software Foundation (ASF) under one
05:         * or more contributor license agreements.  See the NOTICE file
06:         * distributed with this work for additional information
07:         * regarding copyright ownership.  The ASF licenses this file
08:         * to you under the Apache License, Version 2.0 (the
09:         * "License"); you may not use this file except in compliance
10:         * with the License.  You may obtain a copy of the License at
11:         *
12:         *  http://www.apache.org/licenses/LICENSE-2.0
13:         *
14:         * Unless required by applicable law or agreed to in writing,
15:         * software distributed under the License is distributed on an
16:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17:         * KIND, either express or implied.  See the License for the
18:         * specific language governing permissions and limitations
19:         * under the License.
20:         */
21:        package org.apache.struts2.components;
22:
23:        import java.io.Writer;
24:        import java.util.Map;
25:
26:        import org.apache.struts2.views.annotations.StrutsTag;
27:
28:        import com.opensymphony.xwork2.util.ValueStack;
29:
30:        /**
31:         * <!-- START SNIPPET: javadoc -->
32:         *
33:         * <p>Perform basic condition flow. 'If' tag could be used by itself or with 'Else If' Tag and/or single/multiple 'Else'
34:         * Tag.</p>
35:         *
36:         * <!-- END SNIPPET: javadoc -->
37:         *
38:         * <!-- START SNIPPET: params -->
39:         *
40:         * no params
41:         *
42:         * <!-- END SNIPPET: params -->
43:         *
44:         *
45:         * <pre>
46:         * <!-- START SNIPPET: example -->
47:         *  &lt;s:if test="%{false}"&gt;
48:         *      &lt;div&gt;Will Not Be Executed&lt;/div&gt;
49:         *  &lt;/s:if&gt;
50:         *  &lt;s:elseif test="%{true}"&gt;
51:         *      &lt;div&gt;Will Be Executed&lt;/div&gt;
52:         *  &lt;/s:elseif&gt;
53:         *  &lt;s:else&gt;
54:         *      &lt;div&gt;Will Not Be Executed&lt;/div&gt;
55:         *  &lt;/s:else&gt;
56:         * <!-- END SNIPPET: example -->
57:         * </pre>
58:         *
59:         */
60:        @StrutsTag(name="else",tldTagClass="org.apache.struts2.views.jsp.ElseTag",description="Else tag")
61:        public class Else extends Component {
62:            public Else(ValueStack stack) {
63:                super (stack);
64:            }
65:
66:            public boolean start(Writer writer) {
67:                Map context = stack.getContext();
68:                Boolean ifResult = (Boolean) context.get(If.ANSWER);
69:
70:                context.remove(If.ANSWER);
71:
72:                return !((ifResult == null) || (ifResult.booleanValue()));
73:            }
74:        }