org.xchain.framework.util.RegExUtil.java Source code

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Here is the source code for org.xchain.framework.util.RegExUtil.java

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/**
 *    Copyright 2011 meltmedia
 *
 *    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 org.xchain.framework.util;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Utility class for performing parsing operations.
 *
 * @author Christian Trimble
 * @author Josh Kennedy
 */
public class RegExUtil {
    private static Logger log = LoggerFactory.getLogger(RegExUtil.class);

    /**
     * Compiles a regular expression and logs any problems to this class' log.
     */
    public static Pattern compilePattern(String regex, String errorMessage) {
        return compilePattern(regex, log, errorMessage);
    }

    /**
     * Compiles a regular expression and logs an problems to the provided log.  If
     * a compile error occures, then null is returned.  This class will not rethrow the
     * error, so that it's use in a static context will not cause a ClassNotFoundException.
     */
    public static Pattern compilePattern(String regex, Logger log, String errorMessage) {
        Pattern pattern = null;
        try {
            // Compile the pattern.
            pattern = Pattern.compile(regex);
        } catch (PatternSyntaxException pse) {
            if (log.isErrorEnabled()) {
                log.error(errorMessage, pse);
            }
            pse.printStackTrace();
        }
        return pattern;
    }

    /**
     * Exists to allow an upgrade path from Commons Logging to SLF4J
     * 
     * @param regex
     * @param log
     * @param errorMessage
     * @return
     */
    @Deprecated
    public static Pattern compilePattern(String regex, org.apache.commons.logging.Log log, String errorMessage) {
        Pattern pattern = null;
        try {
            // Compile the pattern.
            pattern = Pattern.compile(regex);
        } catch (PatternSyntaxException pse) {
            if (log.isErrorEnabled()) {
                log.error(errorMessage, pse);
            }
            pse.printStackTrace();
        }
        return pattern;
    }
}