Condition


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.dev.cfg;
17  
18  import com.google.gwt.core.ext.GeneratorContext;
19  import com.google.gwt.core.ext.TreeLogger;
20  import com.google.gwt.core.ext.UnableToCompleteException;
21  
22  /**
23   * Abstract base class for various kinds of deferred binding conditions.
24   */
25  public abstract class Condition {
26    public final boolean isTrue(TreeLogger logger, GeneratorContext context,
27        String   testType) throws UnableToCompleteException {
28  
29      boolean logDebug = logger.isLoggable(TreeLogger.DEBUG);
30  
31      if (logDebug) {
32        String   startMsg = getEvalBeforeMessage(testType);
33        logger = logger.branch(TreeLogger.DEBUG, startMsg, null);
34      }
35  
36      boolean result = doEval(logger, context, testType);
37  
38      if (logDebug) {
39        String   afterMsg = getEvalAfterMessage(testType, result);
40        logger.log(TreeLogger.DEBUG, afterMsg, null);
41      }
42  
43      return result;
44    }
45  
46    protected abstract boolean doEval(TreeLogger logger,
47        GeneratorContext context, String   testType)
48        throws UnableToCompleteException;
49  
50    protected abstract String   getEvalAfterMessage(String   testType, boolean result);
51  
52    protected abstract String   getEvalBeforeMessage(String   testType);
53  }
54
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags