1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.validator.routines;
18
19 import java.io.Serializable;
20 import java.text.Format;
21 import java.text.ParsePosition;
22 import java.util.Locale;
23
24 /**
25 * <p>Abstract class for <i>Format</i> based Validation.</p>
26 *
27 * <p>This is a <i>base</i> class for building Date and Number
28 * Validators using format parsing.</p>
29 *
30 * @since 1.3.0
31 */
32 public abstract class AbstractFormatValidator implements Serializable {
33
34 private static final long serialVersionUID = -4690687565200568258L;
35
36 /**
37 * Whether to use strict format.
38 */
39 private final boolean strict;
40
41 /**
42 * Constructs an instance with the specified strict setting.
43 *
44 * @param strict {@code true} if strict
45 * <code>Format</code> parsing should be used.
46 */
47 public AbstractFormatValidator(final boolean strict) {
48 this.strict = strict;
49 }
50
51 /**
52 * <p>Format an object into a <code>String</code> using
53 * the default Locale.</p>
54 *
55 * @param value The value validation is being performed on.
56 * @return The value formatted as a <code>String</code>.
57 */
58 public String format(final Object value) {
59 return format(value, (String)null, (Locale)null);
60 }
61
62 /**
63 * <p>Format a value with the specified <code>Format</code>.</p>
64 *
65 * @param value The value to be formatted.
66 * @param formatter The Format to use.
67 * @return The formatted value.
68 */
69 protected String format(final Object value, final Format formatter) {
70 return formatter.format(value);
71 }
72
73 /**
74 * <p>Format an object into a <code>String</code> using
75 * the specified Locale.</p>
76 *
77 * @param value The value validation is being performed on.
78 * @param locale The locale to use for the Format.
79 * @return The value formatted as a <code>String</code>.
80 */
81 public String format(final Object value, final Locale locale) {
82 return format(value, (String)null, locale);
83 }
84
85 /**
86 * <p>Format an object into a <code>String</code> using
87 * the specified pattern.</p>
88 *
89 * @param value The value validation is being performed on.
90 * @param pattern The pattern used to format the value.
91 * @return The value formatted as a <code>String</code>.
92 */
93 public String format(final Object value, final String pattern) {
94 return format(value, pattern, (Locale)null);
95 }
96
97 /**
98 * <p>Format an object using the specified pattern and/or
99 * <code>Locale</code>.
100 *
101 * @param value The value validation is being performed on.
102 * @param pattern The pattern used to format the value.
103 * @param locale The locale to use for the Format.
104 * @return The value formatted as a <code>String</code>.
105 */
106 public String format(final Object value, final String pattern, final Locale locale) {
107 final Format formatter = getFormat(pattern, locale);
108 return format(value, formatter);
109 }
110
111 /**
112 * <p>Returns a <code>Format</code> for the specified <i>pattern</i>
113 * and/or <code>Locale</code>.</p>
114 *
115 * @param pattern The pattern used to validate the value against or
116 * <code>null</code> to use the default for the <code>Locale</code>.
117 * @param locale The locale to use for the currency format, system default if null.
118 * @return The <code>NumberFormat</code> to created.
119 */
120 protected abstract Format getFormat(String pattern, Locale locale);
121
122 /**
123 * <p>Indicates whether validated values should adhere
124 * strictly to the <code>Format</code> used.</p>
125 *
126 * <p>Typically implementations of <code>Format</code>
127 * ignore invalid characters at the end of the value
128 * and just stop parsing. For example parsing a date
129 * value of <code>01/01/20x0</code> using a pattern
130 * of <code>dd/MM/yyyy</code> will result in a year
131 * of <code>20</code> if <code>strict</code> is set
132 * to {@code false}, whereas setting <code>strict</code>
133 * to {@code true} will cause this value to fail
134 * validation.</p>
135 *
136 * @return {@code true} if strict <code>Format</code>
137 * parsing should be used.
138 */
139 public boolean isStrict() {
140 return strict;
141 }
142
143 /**
144 * <p>Validate using the default <code>Locale</code>.
145 *
146 * @param value The value validation is being performed on.
147 * @return {@code true} if the value is valid.
148 */
149 public boolean isValid(final String value) {
150 return isValid(value, (String)null, (Locale)null);
151 }
152
153 /**
154 * <p>Validate using the specified <code>Locale</code>.
155 *
156 * @param value The value validation is being performed on.
157 * @param locale The locale to use for the Format, defaults to the default
158 * @return {@code true} if the value is valid.
159 */
160 public boolean isValid(final String value, final Locale locale) {
161 return isValid(value, (String)null, locale);
162 }
163
164 /**
165 * <p>Validate using the specified <i>pattern</i>.
166 *
167 * @param value The value validation is being performed on.
168 * @param pattern The pattern used to validate the value against.
169 * @return {@code true} if the value is valid.
170 */
171 public boolean isValid(final String value, final String pattern) {
172 return isValid(value, pattern, (Locale)null);
173 }
174
175 /**
176 * <p>Validate using the specified pattern and/or <code>Locale</code>.
177 *
178 * @param value The value validation is being performed on.
179 * @param pattern The pattern used to format the value.
180 * @param locale The locale to use for the Format, defaults to the default
181 * @return {@code true} if the value is valid.
182 */
183 public abstract boolean isValid(String value, String pattern, Locale locale);
184
185 /**
186 * <p>Parse the value with the specified <code>Format</code>.</p>
187 *
188 * @param value The value to be parsed.
189 * @param formatter The Format to parse the value with.
190 * @return The parsed value if valid or <code>null</code> if invalid.
191 */
192 protected Object parse(final String value, final Format formatter) {
193
194 final ParsePosition pos = new ParsePosition(0);
195 Object parsedValue = formatter.parseObject(value, pos);
196 if (pos.getErrorIndex() > -1) {
197 return null;
198 }
199
200 if (isStrict() && pos.getIndex() < value.length()) {
201 return null;
202 }
203
204 if (parsedValue != null) {
205 parsedValue = processParsedValue(parsedValue, formatter);
206 }
207
208 return parsedValue;
209
210 }
211
212 /**
213 * <p>Process the parsed value, performing any further validation
214 * and type conversion required.</p>
215 *
216 * @param value The parsed object created.
217 * @param formatter The Format used to parse the value with.
218 * @return The parsed value converted to the appropriate type
219 * if valid or <code>null</code> if invalid.
220 */
221 protected abstract Object processParsedValue(Object value, Format formatter);
222
223 }