com.tracer.util.CommonConverter.java Source code

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Here is the source code for com.tracer.util.CommonConverter.java

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/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  Licensed 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 com.tracer.util;

import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.Converter;
import org.apache.commons.lang.StringUtils;

import com.tracer.util.DateUtil;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class CommonConverter implements Converter {

    protected Locale locale;
    protected DateFormat formatter;

    /**
     * Creates new instance of CommonConverter with default locale
     */
    public CommonConverter() {
        this(Locale.getDefault());
    }

    /**
     * Creates new instance of Common converter with specified locale
     *
     * @param locale Locale to use
     */
    public CommonConverter(Locale locale) {
        this.locale = locale;
        this.formatter = new SimpleDateFormat(DateUtil.getDatePattern(locale), locale);
    }

    /**
     * Converts an object to specified class (<code>Date</code>, <code>String</code>
     * or <code>Object</code>). In all other cases a <code>ConversionException</code>
     * will be thrown. The only exception is <code>null</code> value: it will
     * give <code>null</code> regardless of <code>type</code>.
     *
     * @param type the class to which the object need to be converted (this can be
     * <code>Date</code>, <code>String</code> or <code>Object</code>)
     * @param value the object that need to be converted
     * @return converted object
     */
    @SuppressWarnings("rawtypes")
    public Object convert(Class type, Object value) {
        if (value == null) {
            return null;
        } else if (type == Date.class) {
            return convertToDate(type, value);
        } else if (type == String.class) {
            return convertToString(type, value);
        } else if (type == Object.class) {
            return convertToObject(type, value);
        }

        throw new ConversionException("Could not convert " + value.getClass().getName() + " to " + type.getName());
    }

    /**
     * Converts specified object to <code>Date</code>
     *
     * @param type the class to which the object need to be converted
     * @param value the object that need to be converted
     * @return converted object
     */
    @SuppressWarnings("rawtypes")
    protected Object convertToDate(Class type, Object value) {
        if (value instanceof Date) {
            return value;
        }

        if (value instanceof String) {
            try {
                if (StringUtils.isEmpty(value.toString())) {
                    return null;
                }

                return formatter.parse((String) value);
            } catch (Exception pe) {
                throw new ConversionException("Error converting String to Date");
            }
        }

        throw new ConversionException("Could not convert " + value.getClass().getName() + " to " + type.getName());
    }

    /**
     * Converts specified object to <code>String</code>
     *
     * @param type the class to which the object need to be converted
     * @param value the object that need to be converted
     * @return converted object
     */
    @SuppressWarnings("rawtypes")
    protected Object convertToString(Class type, Object value) {
        if (value instanceof Date) {
            try {
                return formatter.format(value);
            } catch (Exception e) {
                throw new ConversionException("Error converting Date to String");
            }
        }

        return value.toString();
    }

    /**
     * Converts specified object to <code>Object</code>
     *
     * @param type the class to which the object need to be converted
     * @param value the object that need to be converted
     * @return converted object
     */
    @SuppressWarnings("rawtypes")
    protected Object convertToObject(Class type, Object value) {
        return value;
    }

}