de.hybris.platform.acceleratorservices.util.RegexParser.java Source code

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Here is the source code for de.hybris.platform.acceleratorservices.util.RegexParser.java

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/*
 * [y] hybris Platform
 *
 * Copyright (c) 2000-2014 hybris AG
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of hybris
 * ("Confidential Information"). You shall not disclose such Confidential
 * Information and shall use it only in accordance with the terms of the
 * license agreement you entered into with hybris.
 *
 *  
 */
package de.hybris.platform.acceleratorservices.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

/**
 * Parser operating on a configured regular expression to return a matching part or null.
 */
public class RegexParser implements InitializingBean {
    private static final int DEFAULT_GROUP = 0;

    private String regex;
    private Pattern pattern;

    @Override
    public void afterPropertiesSet() {
        Assert.hasLength(regex);
        pattern = Pattern.compile(regex);
    }

    /**
     * Parse the value and return the matched part or null
     * 
     * @param value
     * @return matched part or null
     */
    public String parse(final String value) {
        return parse(value, DEFAULT_GROUP);
    }

    /**
     * Parse the value and return the matched group or null
     * 
     * @param value
     * @param group
     * @return matched group or null
     */
    public String parse(final String value, final int group) {
        Assert.isTrue(group >= 0);
        String result = null;
        if (!StringUtils.isBlank(value)) {
            final Matcher matcher = pattern.matcher(value);
            if (matcher.find()) {
                final String groupExp = matcher.group(group);
                if (!StringUtils.isBlank(groupExp)) {
                    result = groupExp;
                }
            }
        }
        return result;
    }

    /**
     * @param regex
     *           the regex to set
     */
    public void setRegex(final String regex) {
        Assert.hasLength(regex);
        this.regex = regex;
    }

    /**
     * @return the regex
     */
    protected String getRegex() {
        return regex;
    }
}