| /* |
| * 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.components; |
| |
| import java.io.Writer; |
| |
| import org.apache.struts2.views.annotations.StrutsTag; |
| import org.apache.struts2.views.annotations.StrutsTagAttribute; |
| |
| import com.opensymphony.xwork2.util.ValueStack; |
| |
| /** |
| * <!-- START SNIPPET: javadoc --> |
| * |
| * <p>Perform basic condition flow. 'If' tag could be used by itself or |
| * with 'Else If' Tag and/or single/multiple 'Else' Tag.</p> |
| * |
| * <!-- END SNIPPET: javadoc --> |
| * |
| * |
| * <!-- START SNIPPET: params --> |
| * |
| * <ul> |
| * |
| * <li>test* (Boolean) - Logic to determined if body of tag is to be displayed</li> |
| * |
| * </ul> |
| * |
| * <!-- END SNIPPET: params --> |
| * |
| * |
| * <pre> |
| * <!-- START SNIPPET: example --> |
| * <s:if test="%{false}"> |
| * <div>Will Not Be Executed</div> |
| * </s:if> |
| * <s:elseif test="%{true}"> |
| * <div>Will Be Executed</div> |
| * </s:elseif> |
| * <s:else> |
| * <div>Will Not Be Executed</div> |
| * </s:else> |
| * <!-- END SNIPPET: example --> |
| * </pre> |
| * |
| * @see Else |
| * @see ElseIf |
| * |
| */ |
| @StrutsTag(name="if", tldTagClass="org.apache.struts2.views.jsp.IfTag", description="If tag") |
| public class If extends Component { |
| public static final String ANSWER = "struts.if.answer"; |
| |
| Boolean answer; |
| String test; |
| |
| @StrutsTagAttribute(description="Expression to determine if body of tag is to be displayed", type="Boolean", required=true) |
| public void setTest(String test) { |
| this.test = test; |
| } |
| |
| public If(ValueStack stack) { |
| super(stack); |
| } |
| |
| public boolean start(Writer writer) { |
| answer = (Boolean) findValue(test, Boolean.class); |
| |
| if (answer == null) { |
| answer = Boolean.FALSE; |
| } |
| stack.getContext().put(ANSWER, answer); |
| return answer.booleanValue(); |
| } |
| |
| public boolean end(Writer writer, String body) { |
| stack.getContext().put(ANSWER, answer); |
| return super.end(writer, body); |
| } |
| } |