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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2015, Telestax Inc and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see 
 *
 */
package org.mobicents.servlet.sip.router;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.sip.SipServletRequest;

/**
 * 
 * Simple implementation that uses a regex against a predefined SIP header.
 * 
 * The regular expression comes from the RouterInfo, and have been previously precompiled for performance.
 * 
 * Several regex may be defined against different headers.
 * 
 * The condition returns true if all the regular expressions match the proper header.
 * 
 * This fixes https://github.com/Mobicents/sip-servlets/issues/5
 */
public class HeaderRegexCondition implements AppRouterCondition {

    /**
     * {@inheritDoc}
     */
    @Override
    public final boolean checkCondition(final SipServletRequest initialRequest, final DefaultSipApplicationRouterInfo info) {
        boolean enabled = true;
        for (String hAux : info.getHeaderPatternMap().keySet()) {
            String headerValue = initialRequest.getHeader(hAux);
            // Pattern is ThreadSafe as doc by Java doc
            // Matcher is not threadsafe, but a new one is created every time.
            // Anyway if performance is degraded, Threadlocal/pool may be used
            Pattern headerPattern = info.getHeaderPatternMap().get(hAux);
            Matcher matcher = headerPattern.matcher(headerValue);
            enabled = enabled && matcher.find();
        }
        return enabled;
    }
}