| /* Copyright 2004-2005 the original author or authors. |
| * |
| * 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.codehaus.groovy.grails.web.taglib; |
| |
| import org.apache.commons.lang.StringUtils; |
| import org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException; |
| |
| /** |
| * Example: |
| * |
| * <code> |
| * <gr:collect in="${thing}" expr="it.length() == 3"> |
| * <p>${it}</p> |
| * </gr:collect> |
| * </code> |
| * @author Graeme Rocher |
| * @since 19-Jan-2006 |
| */ |
| public class GroovyCollectTag extends GroovySyntaxTag { |
| public static final String TAG_NAME = "collect"; |
| private static final String ATTRIBUTE_IN = "in"; |
| private static final String ATTRIBUTE_EXPR = "expr"; |
| |
| public boolean isBufferWhiteSpace() { |
| return false; |
| } |
| |
| public boolean hasPrecedingContent() { |
| return true; |
| } |
| |
| public void doStartTag() { |
| String in = (String) attributes.get(ATTRIBUTE_IN); |
| String expr = (String) attributes.get(ATTRIBUTE_EXPR); |
| if(StringUtils.isBlank(in)) |
| throw new GrailsTagException("Tag ["+TAG_NAME+"] missing required attribute ["+ATTRIBUTE_IN+"]"); |
| if(StringUtils.isBlank(expr)) |
| throw new GrailsTagException("Tag ["+TAG_NAME+"] missing required attribute ["+ATTRIBUTE_EXPR+"]"); |
| |
| out.print(in); |
| out.print(".collect {"); |
| if(expr.startsWith("\"") && expr.endsWith("\"")) { |
| expr = expr.substring(1,expr.length()-1); |
| } |
| out.print(expr); |
| out.println("}.each {"); |
| } |
| |
| public void doEndTag() { |
| out.println("}"); |
| } |
| |
| public String getName() { |
| return TAG_NAME; |
| } |
| } |