org.apache.commons.validator.routines.AbstractFormatValidator.java Source code

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/*
 * 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 <i>Format</i> based Validation.
 * </p>
 * 
 * <p>
 * This is a <i>base</i> class for building Date and Number Validators using format parsing.
 * </p>
 * 
 * @version $Revision: 594917 $ $Date: 2007-11-14 15:36:40 +0000 (Qua, 14 Nov 2007) $
 * @since Validator 1.3.0
 */
public abstract class AbstractFormatValidator implements Serializable {

    private final boolean strict;

    /**
     * Construct an instance with the specified strict setting.
     * 
     * @param strict <code>true</code> if strict <code>Format</code> parsing should be used.
     */
    public AbstractFormatValidator(boolean strict) {
        this.strict = strict;
    }

    /**
     * <p>
     * Indicates whether validated values should adhere strictly to the <code>Format</code> used.
     * </p>
     * 
     * <p>
     * Typically implementations of <code>Format</code> ignore invalid characters at the end of the value and just stop parsing.
     * For example parsing a date value of <code>01/01/20x0</code> using a pattern of <code>dd/MM/yyyy</code> will result in a
     * year of <code>20</code> if <code>strict</code> is set to <code>false</code>, whereas setting <code>strict</code> to
     * <code>true</code> will cause this value to fail validation.
     * </p>
     * 
     * @return <code>true</code> if strict <code>Format</code> parsing should be used.
     */
    public boolean isStrict() {
        return strict;
    }

    /**
     * <p>
     * Validate using the default <code>Locale</code>.
     * 
     * @param value The value validation is being performed on.
     * @return <code>true</code> if the value is valid.
     */
    public boolean isValid(String value) {
        return isValid(value, (String) null, (Locale) null);
    }

    /**
     * <p>
     * Validate using the specified <i>pattern</i>.
     * 
     * @param value The value validation is being performed on.
     * @param pattern The pattern used to validate the value against.
     * @return <code>true</code> if the value is valid.
     */
    public boolean isValid(String value, String pattern) {
        return isValid(value, pattern, (Locale) null);
    }

    /**
     * <p>
     * Validate using the specified <code>Locale</code>.
     * 
     * @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</code> if the value is valid.
     */
    public boolean isValid(String value, Locale locale) {
        return isValid(value, (String) null, locale);
    }

    /**
     * <p>
     * Validate using the specified pattern and/or <code>Locale</code>.
     * 
     * @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</code> if the value is valid.
     */
    public abstract boolean isValid(String value, String pattern, Locale locale);

    /**
     * <p>
     * Format an object into a <code>String</code> using the default Locale.
     * </p>
     * 
     * @param value The value validation is being performed on.
     * @return The value formatted as a <code>String</code>.
     */
    public String format(Object value) {
        return format(value, (String) null, (Locale) null);
    }

    /**
     * <p>
     * Format an object into a <code>String</code> 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 <code>String</code>.
     */
    public String format(Object value, String pattern) {
        return format(value, pattern, (Locale) null);
    }

    /**
     * <p>
     * Format an object into a <code>String</code> 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 <code>String</code>.
     */
    public String format(Object value, Locale locale) {
        return format(value, (String) null, locale);
    }

    /**
     * <p>
     * Format an object using the specified pattern and/or <code>Locale</code>.
     * 
     * @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 <code>String</code>.
     */
    public String format(Object value, String pattern, Locale locale) {
        Format formatter = getFormat(pattern, locale);
        return format(value, formatter);
    }

    /**
     * <p>
     * Format a value with the specified <code>Format</code>.
     * </p>
     * 
     * @param value The value to be formatted.
     * @param formatter The Format to use.
     * @return The formatted value.
     */
    protected String format(Object value, Format formatter) {
        return formatter.format(value);
    }

    /**
     * <p>
     * Parse the value with the specified <code>Format</code>.
     * </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</code> if invalid.
     */
    protected Object parse(String value, Format formatter) {

        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</code> if invalid.
     */
    protected abstract Object processParsedValue(Object value, Format formatter);

    /**
     * <p>
     * Returns a <code>Format</code> for the specified <i>pattern</i> and/or <code>Locale</code>.
     * </p>
     * 
     * @param pattern The pattern used to validate the value against or <code>null</code> to use the default for the
     *            <code>Locale</code>.
     * @param locale The locale to use for the currency format, system default if null.
     * @return The <code>NumberFormat</code> to created.
     */
    protected abstract Format getFormat(String pattern, Locale locale);

}