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comparison org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/validation/AbstractStringToNumberValidator.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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76:f05e6e8b2f2d 78:0a55d2d5a946
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 module org.eclipse.core.internal.databinding.validation.AbstractStringToNumberValidator;
13
14 import java.lang.all;
15
16 import org.eclipse.core.databinding.validation.IValidator;
17 import org.eclipse.core.databinding.validation.ValidationStatus;
18 import org.eclipse.core.internal.databinding.conversion.StringToNumberParser;
19 import org.eclipse.core.internal.databinding.conversion.StringToNumberParser.ParseResult;
20 import org.eclipse.core.runtime.IStatus;
21 import org.eclipse.core.runtime.Status;
22
23 /**
24 * Validates a number that is to be converted by a {@link NumberFormatConverter}.
25 * Validation is comprised of parsing the String and range checks.
26 *
27 * @since 1.0
28 */
29 public abstract class AbstractStringToNumberValidator : IValidator {
30 private final NumberFormatConverter converter;
31 private final bool toPrimitive;
32
33 private final Number min;
34 private final Number max;
35
36 private String outOfRangeMessage;
37
38 /**
39 * Constructs a new instance.
40 *
41 * @param converter converter and thus formatter to be used in validation
42 * @param min minimum value, used for reporting a range error to the user
43 * @param max maximum value, used for reporting a range error to the user
44 */
45 protected this(NumberFormatConverter converter,
46 Number min, Number max) {
47 this.converter = converter;
48 this.min = min;
49 this.max = max;
50
51 if (null !is cast(ClassInfo)converter.getToType()) {
52 ClassInfo clazz = cast(ClassInfo) converter.getToType();
53 toPrimitive = clazz.isPrimitive();
54 } else {
55 toPrimitive = false;
56 }
57 }
58
59 /**
60 * Validates the provided <code>value</code>. An error status is returned if:
61 * <ul>
62 * <li>The value cannot be parsed.</li>
63 * <li>The value is out of range.</li>
64 * </ul>
65 *
66 * @see org.eclipse.core.databinding.validation.IValidator#validate(java.lang.Object)
67 */
68 public final IStatus validate(Object value) {
69 ParseResult result = StringToNumberParser.parse(value, converter
70 .getNumberFormat(), toPrimitive);
71
72 if (result.getNumber() !is null) {
73 if (!isInRange(result.getNumber())) {
74 if (outOfRangeMessage is null) {
75 outOfRangeMessage = StringToNumberParser
76 .createOutOfRangeMessage(min, max, converter
77 .getNumberFormat());
78 }
79
80 return ValidationStatus.error(outOfRangeMessage);
81 }
82 } else if (result.getPosition() !is null) {
83 String parseErrorMessage = StringToNumberParser.createParseErrorMessage(
84 cast(String) value, result.getPosition());
85
86 return ValidationStatus.error(parseErrorMessage);
87 }
88
89 return Status.OK_STATUS;
90 }
91
92 /**
93 * Invoked by {@link #validatecast(Object)} when the range is to be validated.
94 *
95 * @param number
96 * @return <code>true</code> if in range
97 */
98 protected abstract bool isInRange(Number number);
99 }