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1   /*
2    * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package com.sun.codemodel.internal;
27  
28  import java.util.Iterator;
29  import java.util.List;
30  
31  /**
32   * Type variable used to declare generics.
33   *
34   * @see JGenerifiable
35   * @author
36   *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
37   */
38  public final class JTypeVar extends JClass implements JDeclaration {
39  
40      private final String name;
41  
42      private JClass bound;
43  
44      JTypeVar(JCodeModel owner, String _name) {
45          super(owner);
46          this.name = _name;
47      }
48  
49      public String name() {
50          return name;
51      }
52  
53      public String fullName() {
54          return name;
55      }
56  
57      public JPackage _package() {
58          return null;
59      }
60  
61      /**
62       * Adds a bound to this variable.
63       *
64       * @return  this
65       */
66      public JTypeVar bound( JClass c ) {
67          if(bound!=null)
68              throw new IllegalArgumentException("type variable has an existing class bound "+bound);
69          bound = c;
70          return this;
71      }
72  
73      /**
74       * Returns the class bound of this variable.
75       *
76       * <p>
77       * If no bound is given, this method returns {@link Object}.
78       */
79      public JClass _extends() {
80          if(bound!=null)
81              return bound;
82          else
83              return owner().ref(Object.class);
84      }
85  
86      /**
87       * Returns the interface bounds of this variable.
88       */
89      public Iterator<JClass> _implements() {
90          return bound._implements();
91      }
92  
93      public boolean isInterface() {
94          return false;
95      }
96  
97      public boolean isAbstract() {
98          return false;
99      }
100 
101     /**
102      * Prints out the declaration of the variable.
103      */
104     public void declare(JFormatter f) {
105         f.id(name);
106         if(bound!=null)
107             f.p("extends").g(bound);
108     }
109 
110 
111     protected JClass substituteParams(JTypeVar[] variables, List<JClass> bindings) {
112         for(int i=0;i<variables.length;i++)
113             if(variables[i]==this)
114                 return bindings.get(i);
115         return this;
116     }
117 
118     public void generate(JFormatter f) {
119         f.id(name);
120     }
121 }