AbstractFormatValidator.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.validator.routines;
import java.io.Serializable;
import java.text.Format;
import java.text.ParsePosition;
import java.util.Locale;
/**
* <p>Abstract class for <em>Format</em> based Validation.</p>
*
* <p>This is a <em>base</em> class for building Date and Number
* Validators using format parsing.</p>
*
* @since 1.3.0
*/
public abstract class AbstractFormatValidator implements Serializable {
private static final long serialVersionUID = -4690687565200568258L;
/**
* Whether to use strict format.
*/
private final boolean strict;
/**
* Constructs an instance with the specified strict setting.
*
* @param strict {@code true} if strict
* {@code Format} parsing should be used.
*/
public AbstractFormatValidator(final boolean strict) {
this.strict = strict;
}
/**
* <p>Format an object into a {@link String} using
* the default Locale.</p>
*
* @param value The value validation is being performed on.
* @return The value formatted as a {@link String}.
*/
public String format(final Object value) {
return format(value, (String) null, (Locale) null);
}
/**
* <p>Format a value with the specified {@code Format}.</p>
*
* @param value The value to be formatted.
* @param formatter The Format to use.
* @return The formatted value.
*/
protected String format(final Object value, final Format formatter) {
return formatter.format(value);
}
/**
* <p>Format an object into a {@link String} using
* the specified Locale.</p>
*
* @param value The value validation is being performed on.
* @param locale The locale to use for the Format.
* @return The value formatted as a {@link String}.
*/
public String format(final Object value, final Locale locale) {
return format(value, (String) null, locale);
}
/**
* <p>Format an object into a {@link String} using
* the specified pattern.</p>
*
* @param value The value validation is being performed on.
* @param pattern The pattern used to format the value.
* @return The value formatted as a {@link String}.
*/
public String format(final Object value, final String pattern) {
return format(value, pattern, (Locale) null);
}
/**
* <p>Format an object using the specified pattern and/or
* {@link Locale}.
*
* @param value The value validation is being performed on.
* @param pattern The pattern used to format the value.
* @param locale The locale to use for the Format.
* @return The value formatted as a {@link String}.
*/
public String format(final Object value, final String pattern, final Locale locale) {
final Format formatter = getFormat(pattern, locale);
return format(value, formatter);
}
/**
* <p>Returns a {@code Format} for the specified <em>pattern</em>
* and/or {@link Locale}.</p>
*
* @param pattern The pattern used to validate the value against or
* {@code null} to use the default for the {@link Locale}.
* @param locale The locale to use for the currency format, system default if null.
* @return The {@code NumberFormat} to created.
*/
protected abstract Format getFormat(String pattern, Locale locale);
/**
* <p>Indicates whether validated values should adhere
* strictly to the {@code Format} used.</p>
*
* <p>Typically implementations of {@code Format}
* ignore invalid characters at the end of the value
* and just stop parsing. For example parsing a date
* value of {@code 01/01/20x0} using a pattern
* of {@code dd/MM/yyyy} will result in a year
* of {@code 20} if {@code strict} is set
* to {@code false}, whereas setting {@code strict}
* to {@code true} will cause this value to fail
* validation.</p>
*
* @return {@code true} if strict {@code Format}
* parsing should be used.
*/
public boolean isStrict() {
return strict;
}
/**
* <p>Validate using the default {@link Locale}.
*
* @param value The value validation is being performed on.
* @return {@code true} if the value is valid.
*/
public boolean isValid(final String value) {
return isValid(value, (String) null, (Locale) null);
}
/**
* <p>Validate using the specified {@link Locale}.
*
* @param value The value validation is being performed on.
* @param locale The locale to use for the Format, defaults to the default
* @return {@code true} if the value is valid.
*/
public boolean isValid(final String value, final Locale locale) {
return isValid(value, (String) null, locale);
}
/**
* <p>Validate using the specified <em>pattern</em>.
*
* @param value The value validation is being performed on.
* @param pattern The pattern used to validate the value against.
* @return {@code true} if the value is valid.
*/
public boolean isValid(final String value, final String pattern) {
return isValid(value, pattern, (Locale) null);
}
/**
* <p>Validate using the specified pattern and/or {@link Locale}.
*
* @param value The value validation is being performed on.
* @param pattern The pattern used to format the value.
* @param locale The locale to use for the Format, defaults to the default
* @return {@code true} if the value is valid.
*/
public abstract boolean isValid(String value, String pattern, Locale locale);
/**
* <p>Parse the value with the specified {@code Format}.</p>
*
* @param value The value to be parsed.
* @param formatter The Format to parse the value with.
* @return The parsed value if valid or {@code null} if invalid.
*/
protected Object parse(final String value, final Format formatter) {
final ParsePosition pos = new ParsePosition(0);
Object parsedValue = formatter.parseObject(value, pos);
if (pos.getErrorIndex() > -1) {
return null;
}
if (isStrict() && pos.getIndex() < value.length()) {
return null;
}
if (parsedValue != null) {
parsedValue = processParsedValue(parsedValue, formatter);
}
return parsedValue;
}
/**
* <p>Process the parsed value, performing any further validation
* and type conversion required.</p>
*
* @param value The parsed object created.
* @param formatter The Format used to parse the value with.
* @return The parsed value converted to the appropriate type
* if valid or {@code null} if invalid.
*/
protected abstract Object processParsedValue(Object value, Format formatter);
}