NullLiteral


1   /*******************************************************************************
2    * Copyright (c) 2000, 2004 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  
12  package org.eclipse.jdt.core.dom;
13  
14  import java.util.ArrayList  ;
15  import java.util.List  ;
16  
17  /**
18   * Null literal node.
19   * 
20   * @since 2.0
21   */
22  public class NullLiteral extends Expression {
23      
24      /**
25       * A list of property descriptors (element type: 
26       * {@link StructuralPropertyDescriptor}),
27       * or null if uninitialized.
28       */
29      private static final List   PROPERTY_DESCRIPTORS;
30      
31      static {
32          List   propertyList = new ArrayList  (1);
33          createPropertyList(NullLiteral.class, propertyList);
34          PROPERTY_DESCRIPTORS = reapPropertyList(propertyList);
35      }
36  
37      /**
38       * Returns a list of structural property descriptors for this node type.
39       * Clients must not modify the result.
40       * 
41       * @param apiLevel the API level; one of the
42       * <code>AST.JLS&ast;</code> constants
43  
44       * @return a list of property descriptors (element type: 
45       * {@link StructuralPropertyDescriptor})
46       * @since 3.0
47       */
48      public static List   propertyDescriptors(int apiLevel) {
49          return PROPERTY_DESCRIPTORS;
50      }
51              
52      /**
53       * Creates a new unparented null literal node owned by the given AST.
54       * <p>
55       * N.B. This constructor is package-private.
56       * </p>
57       * 
58       * @param ast the AST that is to own this node
59       */
60      NullLiteral(AST ast) {
61          super(ast);
62      }
63  
64      /* (omit javadoc for this method)
65       * Method declared on ASTNode.
66       */
67      final List   internalStructuralPropertiesForType(int apiLevel) {
68          return propertyDescriptors(apiLevel);
69      }
70      
71      /* (omit javadoc for this method)
72       * Method declared on ASTNode.
73       */
74      final int getNodeType0() {
75          return NULL_LITERAL;
76      }
77  
78      /* (omit javadoc for this method)
79       * Method declared on ASTNode.
80       */
81      ASTNode clone0(AST target) {
82          NullLiteral result = new NullLiteral(target);
83          result.setSourceRange(this.getStartPosition(), this.getLength());
84          return result;
85      }
86  
87      /* (omit javadoc for this method)
88       * Method declared on ASTNode.
89       */
90      final boolean subtreeMatch0(ASTMatcher matcher, Object   other) {
91          // dispatch to correct overloaded match method
92          return matcher.match(this, other);
93      }
94  
95      /* (omit javadoc for this method)
96       * Method declared on ASTNode.
97       */
98      void accept0(ASTVisitor visitor) {
99          visitor.visit(this);
100         visitor.endVisit(this);
101     }
102     
103     /* (omit javadoc for this method)
104      * Method declared on ASTNode.
105      */
106     int memSize() {
107         return BASE_NODE_SIZE;
108     }
109     
110     /* (omit javadoc for this method)
111      * Method declared on ASTNode.
112      */
113     int treeSize() {
114         return memSize();
115     }
116 }
117 
118
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