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1   /*
2    * Copyright 2006-2007 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of 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,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package net.sf.ezmorph.primitive;
18  
19  import net.sf.ezmorph.MorphException;
20  
21  import org.apache.commons.lang.builder.EqualsBuilder;
22  import org.apache.commons.lang.builder.HashCodeBuilder;
23  
24  /**
25   * Morphs to a char.
26   *
27   * @author Andres Almiray <aalmiray@users.sourceforge.net>
28   */
29  public final class CharMorpher extends AbstractPrimitiveMorpher
30  {
31     private char defaultValue;
32  
33     public CharMorpher()
34     {
35        super();
36     }
37  
38     /**
39      * @param defaultValue return value if the value to be morphed is null
40      */
41     public CharMorpher( char defaultValue )
42     {
43        super( true );
44        this.defaultValue = defaultValue;
45     }
46  
47     public boolean equals( Object obj )
48     {
49        if( this == obj ){
50           return true;
51        }
52        if( obj == null ){
53           return false;
54        }
55  
56        if( !(obj instanceof CharMorpher) ){
57           return false;
58        }
59  
60        CharMorpher other = (CharMorpher) obj;
61        EqualsBuilder builder = new EqualsBuilder();
62        if( isUseDefault() && other.isUseDefault() ){
63           builder.append( getDefaultValue(), other.getDefaultValue() );
64           return builder.isEquals();
65        }else if( !isUseDefault() && !other.isUseDefault() ){
66           return builder.isEquals();
67        }else{
68           return false;
69        }
70     }
71  
72     /**
73      * Returns the default value for this Morpher.
74      */
75     public char getDefaultValue()
76     {
77        return defaultValue;
78     }
79  
80     public int hashCode()
81     {
82        HashCodeBuilder builder = new HashCodeBuilder();
83        if( isUseDefault() ){
84           builder.append( getDefaultValue() );
85        }
86        return builder.toHashCode();
87     }
88  
89     /**
90      * Morphs the input object into an output object of the supported type.
91      *
92      * @param value The input value to be morphed
93      * @exception MorphException if conversion cannot be performed successfully
94      */
95     public char morph( Object value )
96     {
97        if( value == null ){
98           if( isUseDefault() ){
99              return defaultValue;
100          }else{
101             throw new MorphException( "value is null" );
102          }
103       }
104 
105       if( value instanceof Character ){
106          return ((Character) value).charValue();
107       }else{
108          String s = String.valueOf( value );
109          if( s.length() > 0 ){
110             return s.charAt( 0 );
111          }else{
112             if( isUseDefault() ){
113                return defaultValue;
114             }else{
115                throw new MorphException( "Can't morph value: " + value );
116             }
117          }
118       }
119    }
120 
121    public Class morphsTo()
122    {
123       return Character.TYPE;
124    }
125 }