001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.schema.rules;
016    
017    import java.util.Map;
018    
019    import org.apache.hivemind.ApplicationRuntimeException;
020    import org.apache.hivemind.HiveMind;
021    import org.apache.hivemind.Location;
022    import org.apache.hivemind.internal.Module;
023    import org.apache.hivemind.schema.Translator;
024    
025    /**
026     * Translates a string value to a boolean value.  "true" and "false" are acceptible values.
027     * Other values are logged as errors and treated as false.  Null is simply considered false.
028     *
029     * @author Howard Lewis Ship
030     */
031    public class BooleanTranslator implements Translator
032    {
033        private Boolean _defaultValue = Boolean.FALSE;
034    
035        public BooleanTranslator()
036        {
037        }
038    
039        /**
040         * Initializes the translator, recognizing key "default" as the
041         * default value for the translator when the input is blank.
042         */
043    
044        public BooleanTranslator(String initializer)
045        {
046            Map m = RuleUtils.convertInitializer(initializer);
047    
048            String defaultInit = (String) m.get("default");
049    
050            if (defaultInit != null)
051                _defaultValue = Boolean.valueOf(defaultInit);
052        }
053    
054        public Object translate(
055            Module contributingModule,
056            Class propertyType,
057            String inputValue,
058            Location location)
059        {
060            if (HiveMind.isBlank(inputValue))
061                return _defaultValue;
062    
063            if (inputValue.equals("true"))
064                return Boolean.TRUE;
065    
066            if (inputValue.equals("false"))
067                return Boolean.FALSE;
068    
069            throw new ApplicationRuntimeException(
070                RulesMessages.invalidBooleanValue(inputValue),
071                location,
072                null);
073        }
074    
075    }