| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * Licensed 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.commons.jelly.tags.core; |
| |
| import org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.MissingAttributeException; |
| import org.apache.commons.jelly.TagSupport; |
| import org.apache.commons.jelly.XMLOutput; |
| import org.apache.commons.jelly.expression.Expression; |
| |
| /** |
| * A tag which conditionally evaluates its body if |
| * my {@link #setValue value} attribute equals my ancestor |
| * {@link SwitchTag <switch>} tag's |
| * {@link SwitchTag#setOn "on"} attribute. |
| * |
| * This tag must be contained within the body of some |
| * {@link SwitchTag <switch>} tag. |
| * |
| * @see SwitchTag |
| * |
| * @author Rodney Waldhoff |
| * @version $Revision: 1.8 $ $Date: 2004/09/09 12:27:53 $ |
| */ |
| public class CaseTag extends TagSupport { |
| |
| public CaseTag() { |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| public void setValue(Expression value) { |
| this.valueExpression = value; |
| } |
| |
| public void setFallThru(boolean fallThru) { |
| this.fallThru = fallThru; |
| } |
| |
| public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
| if(null == this.valueExpression) { |
| throw new MissingAttributeException("value"); |
| } |
| SwitchTag tag = (SwitchTag)findAncestorWithClass(SwitchTag.class); |
| if(null == tag) { |
| throw new JellyTagException("This tag must be enclosed inside a <switch> tag" ); |
| } |
| if(tag.hasDefaultBeenEncountered()) { |
| throw new JellyTagException("<default> should be the last tag within a <switch>" ); |
| } |
| Object value = valueExpression.evaluate(context); |
| if(tag.isFallingThru() || |
| (null == tag.getValue() && null == value) || |
| (null != tag.getValue() && tag.getValue().equals(value))) { |
| tag.caseMatched(); |
| tag.setFallingThru(fallThru); |
| invokeBody(output); |
| } |
| } |
| |
| // Attributes |
| //------------------------------------------------------------------------- |
| private Expression valueExpression = null; |
| private boolean fallThru = false; |
| |
| } |