ConditionWhenPropertyIs


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.BadPropertyValueException;
19  import com.google.gwt.core.ext.GeneratorContext;
20  import com.google.gwt.core.ext.PropertyOracle;
21  import com.google.gwt.core.ext.TreeLogger;
22  import com.google.gwt.core.ext.UnableToCompleteException;
23  
24  /**
25   * A deferred binding condition to determine whether a named property has a
26   * particular value.
27   */
28  public class ConditionWhenPropertyIs extends Condition {
29  
30    private final String   propName;
31  
32    private final String   value;
33  
34    public ConditionWhenPropertyIs(String   propName, String   value) {
35      this.propName = propName;
36      this.value = value;
37    }
38  
39    public String   toString() {
40      return "<when-property-is name='" + propName + "' value='" + value + "'/>";
41    }
42  
43    protected boolean doEval(TreeLogger logger, GeneratorContext context,
44        String   testType) throws UnableToCompleteException {
45      String   testValue;
46      try {
47        PropertyOracle propertyOracle = context.getPropertyOracle();
48        testValue = propertyOracle.getPropertyValue(logger, propName);
49        logger.log(TreeLogger.DEBUG, "Property value is '" + testValue + "'",
50            null);
51        if (testValue.equals(value)) {
52          return true;
53        } else {
54          return false;
55        }
56      } catch (BadPropertyValueException e) {
57        String   msg = "Unable to get value of property '" + propName + "'";
58        logger.log(TreeLogger.ERROR, msg, e);
59        throw new UnableToCompleteException();
60      }
61    }
62  
63    protected String   getEvalAfterMessage(String   testType, boolean result) {
64      if (result) {
65        return "Yes, the property value matched";
66      } else {
67        return "No, the value did not match";
68      }
69    }
70  
71    protected String   getEvalBeforeMessage(String   testType) {
72      return toString();
73    }
74  }
75
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