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| org.apache.commons.jexl.parser.ASTEmptyFunction | 
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| 1 |  /* | |
| 2 |   * Copyright 2002-2006 The Apache Software Foundation. | |
| 3 |   * | |
| 4 |   * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 |   * you may not use this file except in compliance with the License. | |
| 6 |   * You may obtain a copy of the License at | |
| 7 |   * | |
| 8 |   *      http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 |   * | |
| 10 |   * Unless required by applicable law or agreed to in writing, software | |
| 11 |   * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 |   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 |   * See the License for the specific language governing permissions and | |
| 14 |   * limitations under the License. | |
| 15 |   */ | |
| 16 | ||
| 17 |  package org.apache.commons.jexl.parser; | |
| 18 | ||
| 19 |  import org.apache.commons.jexl.JexlContext; | |
| 20 | ||
| 21 |  import java.util.Collection; | |
| 22 |  import java.util.Map; | |
| 23 | ||
| 24 |  /** | |
| 25 |   * function to see if reference doesn't exist in context. | |
| 26 |   *  | |
| 27 |   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> | |
| 28 |   * @author <a href="mailto:tobrien@apache.org">Tim O'Brien</a> | |
| 29 |   * @version $Id: ASTEmptyFunction.java 398190 2006-04-29 16:04:10Z dion $ | |
| 30 |   */ | |
| 31 | public class ASTEmptyFunction extends SimpleNode { | |
| 32 |      /** | |
| 33 |       * Create the node given an id. | |
| 34 |       *  | |
| 35 |       * @param id node id. | |
| 36 |       */ | |
| 37 | public ASTEmptyFunction(int id) { | |
| 38 | 0 |          super(id); | 
| 39 | 0 |      } | 
| 40 | ||
| 41 |      /** | |
| 42 |       * Create a node with the given parser and id. | |
| 43 |       *  | |
| 44 |       * @param p a parser. | |
| 45 |       * @param id node id. | |
| 46 |       */ | |
| 47 | public ASTEmptyFunction(Parser p, int id) { | |
| 48 | 22 |          super(p, id); | 
| 49 | 22 | } | 
| 50 | ||
| 51 |      /** {@inheritDoc} */ | |
| 52 |      public Object jjtAccept(ParserVisitor visitor, Object data) { | |
| 53 | 0 |          return visitor.visit(this, data); | 
| 54 | } | |
| 55 | ||
| 56 |      /** {@inheritDoc} */ | |
| 57 |      public Object value(JexlContext jc) throws Exception { | |
| 58 | 21 | SimpleNode sn = (SimpleNode) jjtGetChild(0); | 
| 59 | ||
| 60 |          /* | |
| 61 |           * I can't believe this | |
| 62 |           */ | |
| 63 | ||
| 64 | 21 | Object o = sn.value(jc); | 
| 65 | ||
| 66 | 21 | if (o == null) { | 
| 67 | 3 |              return Boolean.TRUE; | 
| 68 | } | |
| 69 | ||
| 70 | 18 | if (o instanceof String && "".equals(o)) { | 
| 71 | 9 |              return Boolean.TRUE; | 
| 72 | } | |
| 73 | ||
| 74 | 9 |          if (o.getClass().isArray() && ((Object[]) o).length == 0) { | 
| 75 | 1 |              return Boolean.TRUE; | 
| 76 | } | |
| 77 | ||
| 78 | 8 |          if (o instanceof Collection && ((Collection) o).isEmpty()) { | 
| 79 | 3 |              return Boolean.TRUE; | 
| 80 | } | |
| 81 | ||
| 82 |          /* | |
| 83 |           * Map isn't a collection | |
| 84 |           */ | |
| 85 | 5 |          if (o instanceof Map && ((Map) o).isEmpty()) { | 
| 86 | 1 |              return Boolean.TRUE; | 
| 87 | } | |
| 88 | ||
| 89 | 4 |          return Boolean.FALSE; | 
| 90 | } | |
| 91 | } | 
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