FieldResolver


1   /*******************************************************************************
2    * Copyright (c) 2006 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  package org.eclipse.jdt.internal.corext.template.java;
12  
13  import java.util.List  ;
14  
15  import org.eclipse.jface.text.templates.TemplateContext;
16  import org.eclipse.jface.text.templates.TemplateVariable;
17  import org.eclipse.jface.text.templates.TemplateVariableResolver;
18  
19  import org.eclipse.jdt.internal.corext.template.java.CompilationUnitCompletion.Variable;
20  
21  /**
22   * Resolves a template variable to a field that is assignment-compatible
23   * with the variable instance' class parameter.
24   * 
25   * @since 3.3
26   */
27  public class FieldResolver extends TemplateVariableResolver {
28      
29      private final String   fDefaultType;
30      private String   fType;
31  
32      /**
33       * Default constructor for instantiation by the extension point.
34       */
35      public FieldResolver() {
36          this("java.lang.Object"); //$NON-NLS-1$
37      }
38      
39      FieldResolver(String   defaultType) {
40          fDefaultType= defaultType;
41      }
42  
43      /*
44       * @see org.eclipse.jface.text.templates.TemplateVariableResolver#resolve(org.eclipse.jface.text.templates.TemplateVariable, org.eclipse.jface.text.templates.TemplateContext)
45       */
46      public void resolve(TemplateVariable variable, TemplateContext context) {
47          List   params= variable.getVariableType().getParams();
48          if (params.size() == 0)
49              fType= fDefaultType;
50          else
51              fType= (String  ) params.get(0);
52          
53          if (variable instanceof JavaVariable) {
54              JavaContext jc= (JavaContext) context;
55              JavaVariable jv= (JavaVariable) variable;
56              jv.setParamType(fType);
57              Variable[] fields= jc.getFields(fType);
58              if (fields.length > 0) {
59                  jv.setChoices(fields);
60                  jc.markAsUsed(jv.getDefaultValue());
61              } else {
62                  super.resolve(variable, context);
63                  return;
64              }
65              if (fields.length > 1)
66                  variable.setUnambiguous(false);
67              else
68                  variable.setUnambiguous(isUnambiguous(context));
69          } else
70              super.resolve(variable, context);
71      }
72      
73      /*
74       * @see org.eclipse.jface.text.templates.TemplateVariableResolver#resolveAll(org.eclipse.jface.text.templates.TemplateContext)
75       */
76      protected String  [] resolveAll(TemplateContext context) {
77          JavaContext jc= (JavaContext) context;
78          Variable[] iterables= jc.getFields(fType);
79          String  [] names= new String  [iterables.length];
80          for (int i= 0; i < iterables.length; i++)
81              names[i]= iterables[i].getName();
82          if (names.length > 0)
83              jc.markAsUsed(names[0]);
84          return names;
85      }
86  }
87
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