src/web/org/codehaus/groovy/grails/web/taglib/GroovyWhileTag.java

   1 /* Copyright 2004-2005 the original author or authors.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at
   6  *
   7  *      http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 package org.codehaus.groovy.grails.web.taglib;
  16
  17 import org.apache.commons.lang.StringUtils;
  18 import org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException;
  19
  20 /**
  21  * @author Graeme Rocher
  22  * @since 18-Jan-2006
  23  */
  24 public class GroovyWhileTag extends GroovySyntaxTag {
  25     public static final String TAG_NAME = "while";
  26     private static final String ATTRIBUTE_TEST = "test";
  27
  28     public void doStartTag() {
  29         String test = (String) attributes.get(ATTRIBUTE_TEST);
  30         if(StringUtils.isBlank(test))
  31             throw new GrailsTagException("Tag ["+TAG_NAME+"] missing required attribute ["+ATTRIBUTE_TEST+"]");
  32         out.print("while(");
  33         out.print(test);
  34         out.println(") {");
  35     }
  36
  37     public void doEndTag() {
  38         out.println("}");
  39     }
  40
  41     public String getName() {
  42         return TAG_NAME;
  43     }
  44
  45     public boolean isBufferWhiteSpace() {
  46         return true;
  47     }
  48
  49     public boolean hasPrecedingContent() {
  50         return true;
  51     }
  52 }