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

001:        /*
002:         * $Id: ElseIf.java 497654 2007-01-19 00:21:57Z rgielen $
003:         *
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *  http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:        package org.apache.struts2.components;
022:
023:        import java.io.Writer;
024:
025:        import org.apache.struts2.views.annotations.StrutsTag;
026:        import org.apache.struts2.views.annotations.StrutsTagAttribute;
027:
028:        import com.opensymphony.xwork2.util.ValueStack;
029:
030:        /**
031:         * <!-- START SNIPPET: javadoc -->
032:         *
033:         * <p>Perform basic condition flow. 'If' tag could be used by itself or with 'Else If' Tag and/or single/multiple 'Else'
034:         * Tag.</p>
035:         *
036:         * <!-- END SNIPPET: javadoc -->
037:         *
038:         *
039:         * <!-- START SNIPPET: params -->
040:         *
041:         * <ul>
042:         *
043:         * <li>test* (Boolean) - Logic to determined if body of tag is to be displayed</li>
044:         *
045:         * </ul>
046:         *
047:         * <!-- END SNIPPET: params -->
048:         *
049:         *
050:         * <pre>
051:         * <!-- START SNIPPET: example -->
052:         *  &lt;s:if test="%{false}"&gt;
053:         *      &lt;div&gt;Will Not Be Executed&lt;/div&gt;
054:         *  &lt;/s:if&gt;
055:         *  &lt;s:elseif test="%{true}"&gt;
056:         *      &lt;div&gt;Will Be Executed&lt;/div&gt;
057:         *  &lt;/s:elseif&gt;
058:         *  &lt;s:else&gt;
059:         *      &lt;div&gt;Will Not Be Executed&lt;/div&gt;
060:         *  &lt;/s:else&gt;
061:         * <!-- END SNIPPET: example -->
062:         * </pre>
063:         *
064:         */
065:        @StrutsTag(name="elseif",tldTagClass="org.apache.struts2.views.jsp.ElseIfTag",description="Elseif tag")
066:        public class ElseIf extends Component {
067:            public ElseIf(ValueStack stack) {
068:                super (stack);
069:            }
070:
071:            protected Boolean answer;
072:            protected String test;
073:
074:            public boolean start(Writer writer) {
075:                Boolean ifResult = (Boolean) stack.getContext().get(If.ANSWER);
076:
077:                if ((ifResult == null) || (ifResult.booleanValue())) {
078:                    return false;
079:                }
080:
081:                //make the comparision
082:                answer = (Boolean) findValue(test, Boolean.class);
083:
084:                if (answer == null) {
085:                    answer = Boolean.FALSE;
086:                }
087:                if (answer.booleanValue()) {
088:                    stack.getContext().put(If.ANSWER, answer);
089:                }
090:                return answer != null && answer.booleanValue();
091:            }
092:
093:            public boolean end(Writer writer, String body) {
094:                if (answer == null) {
095:                    answer = Boolean.FALSE;
096:                }
097:                if (answer.booleanValue()) {
098:                    stack.getContext().put(If.ANSWER, answer);
099:                }
100:                return super .end(writer, "");
101:            }
102:
103:            @StrutsTagAttribute(description="Expression to determine if body of tag is to be displayed",type="Boolean",required=true)
104:            public void setTest(String test) {
105:                this.test = test;
106:            }
107:        }