/*
 * 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.log4j.varia;

import org.apache.log4j.spi.Filter;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.helpers.OptionConverter;

/**
 * This is a very simple filter based on string matching.
 *
 * <p>
 * The filter admits two options <b>StringToMatch</b> and <b>AcceptOnMatch</b>.
 * If there is a match between the value of the StringToMatch option and the
 * message of the {@link org.apache.log4j.spi.LoggingEvent}, then the
 * {@link #decide(LoggingEvent)} method returns
 * {@link org.apache.log4j.spi.Filter#ACCEPT} if the <b>AcceptOnMatch</b> option
 * value is true, if it is false then {@link org.apache.log4j.spi.Filter#DENY}
 * is returned. If there is no match,
 * {@link org.apache.log4j.spi.Filter#NEUTRAL} is returned.
 *
 * @author Ceki G&uuml;lc&uuml;
 * @since 0.9.0
 */
public class StringMatchFilter extends Filter {

    /**
     * @deprecated Options are now handled using the JavaBeans paradigm. This
     *             constant is not longer needed and will be removed in the
     *             <em>near</em> term.
     */
    public static final String STRING_TO_MATCH_OPTION = "StringToMatch";

    /**
     * @deprecated Options are now handled using the JavaBeans paradigm. This
     *             constant is not longer needed and will be removed in the
     *             <em>near</em> term.
     */
    public static final String ACCEPT_ON_MATCH_OPTION = "AcceptOnMatch";

    boolean acceptOnMatch = true;
    String stringToMatch;

    /**
     * @deprecated We now use JavaBeans introspection to configure components.
     *             Options strings are no longer needed.
     */
    public String[] getOptionStrings() {
	return new String[] { STRING_TO_MATCH_OPTION, ACCEPT_ON_MATCH_OPTION };
    }

    /**
     * @deprecated Use the setter method for the option directly instead of the
     *             generic <code>setOption</code> method.
     */
    public void setOption(String key, String value) {

	if (key.equalsIgnoreCase(STRING_TO_MATCH_OPTION)) {
	    stringToMatch = value;
	} else if (key.equalsIgnoreCase(ACCEPT_ON_MATCH_OPTION)) {
	    acceptOnMatch = OptionConverter.toBoolean(value, acceptOnMatch);
	}
    }

    public void setStringToMatch(String s) {
	stringToMatch = s;
    }

    public String getStringToMatch() {
	return stringToMatch;
    }

    public void setAcceptOnMatch(boolean acceptOnMatch) {
	this.acceptOnMatch = acceptOnMatch;
    }

    public boolean getAcceptOnMatch() {
	return acceptOnMatch;
    }

    /**
     * Returns {@link Filter#NEUTRAL} is there is no string match.
     */
    public int decide(LoggingEvent event) {
	String msg = event.getRenderedMessage();

	if (msg == null || stringToMatch == null)
	    return Filter.NEUTRAL;

	if (msg.indexOf(stringToMatch) == -1) {
	    return Filter.NEUTRAL;
	} else { // we've got a match
	    if (acceptOnMatch) {
		return Filter.ACCEPT;
	    } else {
		return Filter.DENY;
	    }
	}
    }
}
