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comparison org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/conversion/IdentityConverter.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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children 6be48cf9f95c
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*
2 * Copyright cast(C) 2005 db4objects Inc. http://www.db4o.com and others.
3 *
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
8 *
9 * Contributors:
10 * db4objects - Initial API and implementation
11 * Matt Carter - Character support completed (bug 197679)
12 */
13 module org.eclipse.core.internal.databinding.conversion.IdentityConverter;
14
15 import java.lang.all;
16
17 import org.eclipse.core.databinding.BindingException;
18 import org.eclipse.core.databinding.conversion.IConverter;
19
20 /**
21 * TheIdentityConverter. Returns the source value (the identity function).
22 */
23 public class IdentityConverter : IConverter {
24
25 private ClassInfo fromType;
26
27 private ClassInfo toType;
28
29 /**
30 * @param type
31 */
32 public this(ClassInfo type) {
33 this.fromType = type;
34 this.toType = type;
35 }
36
37 /**
38 * @param fromType
39 * @param toType
40 */
41 public this(ClassInfo fromType, ClassInfo toType) {
42 this.fromType = fromType;
43 this.toType = toType;
44 }
45
46 private ClassInfo[][] primitiveMap = new ClassInfo[][] [
47 [ Integer.TYPE, Integer.classinfo ], [ Short.TYPE, Short.classinfo ],
48 [ Long.TYPE, Long.classinfo ], [ Double.TYPE, Double.classinfo ],
49 [ Byte.TYPE, Byte.classinfo ], [ Float.TYPE, Float.classinfo ],
50 [ Boolean.TYPE, Boolean.classinfo ],
51 [ Character.TYPE, Character.classinfo ] ];
52
53 /*
54 * (non-Javadoc)
55 *
56 * @see org.eclipse.jface.binding.converter.IConverter#convert(java.lang.Object)
57 */
58 public Object convert(Object source) {
59 if (toType.isPrimitive()) {
60 if (source is null) {
61 throw new BindingException("Cannot convert null to a primitive"); //$NON-NLS-1$
62 }
63 }
64 if (source !is null) {
65 ClassInfo sourceClass = source.getClass();
66 if (toType.isPrimitive() || sourceClass.isPrimitive()) {
67 if (sourceClass.equals(toType)
68 || isPrimitiveTypeMatchedWithBoxed(sourceClass, toType)) {
69 return source;
70 }
71 throw new BindingException(
72 "Boxed and unboxed types do not match"); //$NON-NLS-1$
73 }
74 if (!toType.isAssignableFrom(sourceClass)) {
75 throw new BindingException(sourceClass.getName()
76 + " is not assignable to " + toType.getName()); //$NON-NLS-1$
77 }
78 }
79 return source;
80 }
81
82 /**
83 * (Non-API) isPrimitiveTypeMatchedWithBoxed.
84 *
85 * @param sourceClass
86 * @param toClass
87 * @return true if sourceClass and toType are matched primitive/boxed types
88 */
89 public bool isPrimitiveTypeMatchedWithBoxed(ClassInfo sourceClass,
90 ClassInfo toClass) {
91 for (int i = 0; i < primitiveMap.length; i++) {
92 if (toClass.equals(primitiveMap[i][0])
93 && sourceClass.equals(primitiveMap[i][1])) {
94 return true;
95 }
96 if (sourceClass.equals(primitiveMap[i][0])
97 && toClass.equals(primitiveMap[i][1])) {
98 return true;
99 }
100 }
101 return false;
102 }
103
104 public Object getFromType() {
105 return fromType;
106 }
107
108 public Object getToType() {
109 return toType;
110 }
111
112 }