| /* |
| * 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; |
| |
| |
| /** |
| * Executes the child <case> tag whose value equals my on attribute. |
| * Executes a child <default> tag when present and no <case> tag has |
| * yet matched. |
| * |
| * @see CaseTag |
| * @see DefaultTag |
| * |
| * @author Rodney Waldhoff |
| * @version $Revision: 1.7 $ $Date: 2004/09/09 12:27:53 $ |
| */ |
| public class SwitchTag extends TagSupport { |
| |
| public SwitchTag() { |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| |
| /** |
| * Sets the value to switch on. |
| * Note that the {@link Expression} is evaluated only once, when the |
| * <switch> tag is evaluated. |
| * @param on the value to switch on |
| */ |
| public void setOn(Expression on) { |
| this.on = on; |
| } |
| |
| public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
| if(null == on) { |
| throw new MissingAttributeException("on"); |
| } else { |
| value = on.evaluate(context); |
| invokeBody(output); |
| } |
| } |
| |
| // Protected properties |
| //------------------------------------------------------------------------- |
| protected boolean hasSomeCaseMatched() { |
| return this.someCaseMatched; |
| } |
| |
| protected void caseMatched() { |
| this.someCaseMatched = true; |
| } |
| |
| protected boolean isFallingThru() { |
| return this.fallingThru; |
| } |
| |
| protected void setFallingThru(boolean fallingThru) { |
| this.fallingThru = fallingThru; |
| } |
| |
| protected Object getValue() { |
| return value; |
| } |
| |
| protected boolean hasDefaultBeenEncountered() { |
| return defaultEncountered; |
| } |
| |
| protected void defaultEncountered() { |
| this.defaultEncountered = true; |
| } |
| |
| // Attributes |
| //------------------------------------------------------------------------- |
| private boolean someCaseMatched = false; |
| private boolean fallingThru = false; |
| private boolean defaultEncountered = false; |
| private Expression on = null; |
| private Object value = null; |
| |
| } |