Coverage Report - org.apache.tapestry.coerce.ValueConverterImpl
 
Classes in this File Line Coverage Branch Coverage Complexity
ValueConverterImpl
0%
0/59
0%
0/58
5.143
 
 1  
 // Copyright 2004, 2005 The Apache Software Foundation
 2  
 //
 3  
 // Licensed under the Apache License, Version 2.0 (the "License");
 4  
 // you may not use this file except in compliance with the License.
 5  
 // You may obtain a copy of the License at
 6  
 //
 7  
 //     http://www.apache.org/licenses/LICENSE-2.0
 8  
 //
 9  
 // Unless required by applicable law or agreed to in writing, software
 10  
 // distributed under the License is distributed on an "AS IS" BASIS,
 11  
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12  
 // See the License for the specific language governing permissions and
 13  
 // limitations under the License.
 14  
 
 15  
 package org.apache.tapestry.coerce;
 16  
 
 17  
 import org.apache.hivemind.ApplicationRuntimeException;
 18  
 import org.apache.hivemind.util.ConstructorUtils;
 19  
 import org.apache.hivemind.util.Defense;
 20  
 
 21  
 import java.beans.PropertyEditor;
 22  
 import java.beans.PropertyEditorManager;
 23  
 import java.util.HashMap;
 24  
 import java.util.Iterator;
 25  
 import java.util.List;
 26  
 import java.util.Map;
 27  
 
 28  
 /**
 29  
  * Implementation of {@link org.apache.tapestry.coerce.ValueConverter}. Selects an appropriate type
 30  
  * converter and delegates to it.
 31  
  * 
 32  
  * @author Howard M. Lewis Ship
 33  
  * @since 4.0
 34  
  */
 35  0
 public class ValueConverterImpl implements ValueConverter
 36  
 {
 37  
     /** List of {@link org.apache.tapestry.coerce.TypeConverterContribution}. */
 38  
 
 39  
     public List _contributions;
 40  
     
 41  0
     private Map _converterMap = new HashMap();
 42  
 
 43  0
     private Map _primitiveToWrapper = new HashMap();
 44  
 
 45  0
     private Map _wrapperToPrimitive = new HashMap();
 46  
 
 47  
     {
 48  0
         store(boolean.class, Boolean.class);
 49  0
         store(byte.class, Byte.class);
 50  0
         store(short.class, Short.class);
 51  0
         store(char.class, Character.class);
 52  0
         store(int.class, Integer.class);
 53  0
         store(long.class, Long.class);
 54  0
         store(float.class, Float.class);
 55  0
         store(double.class, Double.class);
 56  0
     }
 57  
 
 58  
     private void store(Class primitive, Class wrapper)
 59  
     {
 60  0
         _primitiveToWrapper.put(primitive, wrapper);
 61  
 
 62  0
         _wrapperToPrimitive.put(wrapper, primitive);
 63  0
     }
 64  
 
 65  
     public void initializeService()
 66  
     {
 67  0
         Iterator i = _contributions.iterator();
 68  0
         while (i.hasNext())
 69  
         {
 70  0
             TypeConverterContribution c = (TypeConverterContribution) i.next();
 71  
 
 72  0
             _converterMap.put(c.getSubjectClass(), c.getConverter());
 73  0
         }
 74  0
     }
 75  
 
 76  
     public Object coerceValue(Object value, Class desiredType)
 77  
     {
 78  0
         Defense.notNull(desiredType, "desiredType");
 79  
 
 80  0
         Class effectiveType = convertType(desiredType);
 81  
 
 82  
         // Already the correct type? Go no further!
 83  
 
 84  0
         if (value != null && effectiveType.isAssignableFrom(value.getClass()))
 85  0
             return value;
 86  
         
 87  0
         Object result = convertNumberToNumber(value, effectiveType);
 88  
 
 89  0
         if (result != null)
 90  0
             return result;
 91  
 
 92  0
         result = convertUsingPropertyEditor(value, effectiveType);
 93  
 
 94  0
         if (result != null)
 95  0
             return result;
 96  
 
 97  0
         TypeConverter converter = (TypeConverter) _converterMap.get(effectiveType);
 98  
 
 99  
         // null value and no converter for the given type? Just return null.
 100  
 
 101  0
         if (value == null && converter == null)
 102  0
             return null;
 103  
 
 104  0
         if (converter == null)
 105  0
             throw new ApplicationRuntimeException(CoerceMessages.noConverter(value.getClass(), effectiveType));
 106  
 
 107  0
         return converter.convertValue(value);
 108  
     }
 109  
 
 110  
     /**
 111  
      * Attempts to use {@link java.beans.PropertyEditor}to perform a conversion from a string to a
 112  
      * numeric type. Returns null if no property editor can be found.
 113  
      * 
 114  
      * @param value
 115  
      *            The value to convert
 116  
      * @param targetType
 117  
      *            The type to convert to (must be a wrapper type, not a primitive type)
 118  
      */
 119  
 
 120  
     private Number convertUsingPropertyEditor(Object value, Class targetType)
 121  
     {
 122  
         // Convert from wrapper type back to primitive type, because
 123  
         // PropertyEditorManager expects primitive types not
 124  
         // wrapper types.
 125  
 
 126  0
         if (value == null || value.getClass() != String.class
 127  
                 || !Number.class.isAssignableFrom(targetType))
 128  0
             return null;
 129  
 
 130  0
         Class primitiveType = (Class) _wrapperToPrimitive.get(targetType);
 131  
 
 132  
         // Note a primitive type.
 133  
 
 134  0
         if (primitiveType == null)
 135  0
             return null;
 136  
 
 137  
         // Looks like a conversion from String to Number, let's see.
 138  
 
 139  0
         PropertyEditor editor = PropertyEditorManager.findEditor(primitiveType);
 140  
 
 141  
         // This should not happen, since we've filtered down to just the
 142  
         // primitive types that do have property editors.
 143  
 
 144  0
         if (editor == null)
 145  0
             return null;
 146  
 
 147  0
         String text = (String) value;
 148  
 
 149  
         try
 150  
         {
 151  0
             editor.setAsText(text);
 152  
 
 153  0
             return (Number) editor.getValue();
 154  
         }
 155  0
         catch (Exception ex)
 156  
         {
 157  0
             throw new ApplicationRuntimeException(CoerceMessages.stringToNumberConversionError(
 158  
                     text,
 159  
                     targetType,
 160  
                     ex), ex);
 161  
         }
 162  
 
 163  
     }
 164  
 
 165  
     private Number convertNumberToNumber(Object value, Class targetType)
 166  
     {
 167  0
         if (value == null || !Number.class.isAssignableFrom(value.getClass())
 168  
                 || !Number.class.isAssignableFrom(targetType))
 169  0
             return null;
 170  
 
 171  0
         String valueAsString = value.toString();
 172  
 
 173  0
         return (Number) ConstructorUtils.invokeConstructor(targetType, new Object[] { valueAsString });
 174  
     }
 175  
 
 176  
     private Class convertType(Class possiblePrimitiveType)
 177  
     {
 178  0
         Class wrapperType = (Class) _primitiveToWrapper.get(possiblePrimitiveType);
 179  
 
 180  0
         return wrapperType == null ? possiblePrimitiveType : wrapperType;
 181  
     }
 182  
 
 183  
     public void setContributions(List contributions)
 184  
     {
 185  0
         _contributions = contributions;
 186  0
     }
 187  
 }