IntegerToStringConverter


1   /*******************************************************************************
2    * Copyright (c) 2007 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   ******************************************************************************/
11  
12  package org.eclipse.core.internal.databinding.conversion;
13  
14  import org.eclipse.core.databinding.conversion.Converter;
15  
16  import com.ibm.icu.text.NumberFormat;
17  
18  /**
19   * Converts a value that is an integer, non decimal, to a String using a
20   * NumberFormat.
21   * <p>
22   * This class is a temporary as this ability exists in NumberToStringConverter
23   * except that short and byte are missing.
24   * </p>
25   * 
26   * @since 1.0
27   */
28  public class IntegerToStringConverter extends Converter {
29      private final boolean primitive;
30      private final NumberFormat numberFormat;
31      private final Class   boxedType;
32  
33      /**
34       * @param numberFormat
35       * @param fromType
36       * @param boxedType
37       */
38      private IntegerToStringConverter(NumberFormat numberFormat, Class   fromType,
39              Class   boxedType) {
40          super(fromType, String  .class);
41          this.primitive = fromType.isPrimitive();
42          this.numberFormat = numberFormat;
43          this.boxedType = boxedType;
44      }
45  
46      /*
47       * (non-Javadoc)
48       * 
49       * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object)
50       */
51      public Object   convert(Object   fromObject) {
52          // Null is allowed when the type is not primitve.
53          if (fromObject == null && !primitive) {
54              return ""; //$NON-NLS-1$
55          }
56  
57          if (!boxedType.isInstance(fromObject)) {
58              throw new IllegalArgumentException  (
59                      "'fromObject' is not of type [" + boxedType + "]."); //$NON-NLS-1$//$NON-NLS-2$
60          }
61  
62          return numberFormat.format(((Number  ) fromObject).longValue());
63      }
64  
65      /**
66       * @param primitive
67       * @return converter
68       */
69      public static IntegerToStringConverter fromShort(boolean primitive) {
70          return fromShort(NumberFormat.getIntegerInstance(), primitive);
71      }
72  
73      /**
74       * @param numberFormat
75       * @param primitive
76       * @return converter
77       */
78      public static IntegerToStringConverter fromShort(NumberFormat numberFormat,
79              boolean primitive) {
80          return new IntegerToStringConverter(numberFormat,
81                  primitive ? Short.TYPE : Short  .class, Short  .class);
82      }
83  
84      /**
85       * @param primitive
86       * @return converter
87       */
88      public static IntegerToStringConverter fromByte(boolean primitive) {
89          return fromByte(NumberFormat.getIntegerInstance(), primitive);
90      }
91  
92      /**
93       * @param numberFormat
94       * @param primitive
95       * @return converter
96       */
97      public static IntegerToStringConverter fromByte(NumberFormat numberFormat,
98              boolean primitive) {
99          return new IntegerToStringConverter(numberFormat, primitive ? Byte.TYPE
100                 : Byte  .class, Byte  .class);
101     }
102 }
103
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