LookupMethodCreator


1   /*
2    * Copyright 2006 Google Inc.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5    * use this file except in compliance with the License. You may obtain a copy of
6    * 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, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations under
14   * the License.
15   */
16  package com.google.gwt.i18n.rebind;
17  
18  import com.google.gwt.core.ext.TreeLogger;
19  import com.google.gwt.core.ext.typeinfo.JMethod;
20  import com.google.gwt.core.ext.typeinfo.JPrimitiveType;
21  import com.google.gwt.core.ext.typeinfo.JType;
22  import com.google.gwt.user.rebind.AbstractGeneratorClassCreator;
23  import com.google.gwt.user.rebind.AbstractMethodCreator;
24  import com.google.gwt.user.rebind.AbstractSourceCreator;
25  
26  import java.text.MessageFormat  ;
27  
28  /**
29   * Method creator to call the correct Map for the given Dictionary.
30   */
31  class LookupMethodCreator extends AbstractMethodCreator {
32    private JType returnType;
33  
34    /**
35     * Constructor for <code>LookupMethodCreator</code>.
36     * 
37     * @param classCreator parent class creator
38     * @param returnType associated return type
39     */
40    public LookupMethodCreator(AbstractGeneratorClassCreator classCreator,
41        JType returnType) {
42      super(classCreator);
43      this.returnType = returnType;
44    }
45  
46    public void createMethodFor(TreeLogger logger, JMethod targetMethod,
47        String   value) {
48      createMethodFor(targetMethod);
49    }
50  
51    void createMethodFor(JMethod targetMethod) {
52      String   template = "{0} target = ({0})cache.get(arg0);";
53      String   type;
54      JPrimitiveType s = returnType.isPrimitive();
55      if (s != null) {
56        type = AbstractSourceCreator.getJavaObjectTypeFor(s);
57      } else {
58        type = returnType.getQualifiedSourceName();
59      }
60      Object  [] args = {type};
61      String   lookup = MessageFormat.format(template, args);
62      println(lookup);
63      println("if (target != null)");
64      printReturnTarget();
65      JMethod[] methods = ((ConstantsWithLookupImplCreator) currentCreator).allInterfaceMethods;
66      for (int i = 0; i < methods.length; i++) {
67        if (methods[i].getReturnType().equals(returnType)
68            && methods[i] != targetMethod) {
69          String   methodName = methods[i].getName();
70          String   body = "if(arg0.equals(" + wrap(methodName) + ")){";
71          println(body);
72          printFound(methodName);
73          println("}");
74        }
75      }
76      String   format = "throw new java.util.MissingResourceException(\"Cannot find constant ''\" + {0} + \"''; expecting a method name\", \"{1}\", {0});";
77      String  [] throwArgs = {
78          "arg0", this.currentCreator.getTarget().getQualifiedSourceName()};
79      String   result = MessageFormat.format(format, throwArgs);
80      println(result);
81    }
82  
83    void printFound(String   methodName) {
84      Object  [] args2 = {methodName};
85      println(MessageFormat.format(returnTemplate(), args2));
86    }
87  
88    void printReturnTarget() {
89      println("return target;");
90    }
91  
92    String   returnTemplate() {
93      return "return {0}();";
94    }
95  }
96
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