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//
//  ========================================================================
//  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.rewrite.handler;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.http.PathMap;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.util.URIUtil;

/**
 * Rewrite the URI by replacing the matched {@link PathMap} path with a fixed string. 
 */
public class RewritePatternRule extends PatternRule implements Rule.ApplyURI
{
    private String _replacement;

    /* ------------------------------------------------------------ */
    public RewritePatternRule()
    {
        _handling = false;
        _terminating = false;
    }

    /* ------------------------------------------------------------ */
    /**
     * Whenever a match is found, it replaces with this value.
     * 
     * @param value the replacement string.
     */
    public void setReplacement(String value)
    {
        _replacement = value;
    }

    /* ------------------------------------------------------------ */
    /*
     * (non-Javadoc)
     * @see org.eclipse.jetty.server.handler.rules.RuleBase#apply(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public String apply(String target, HttpServletRequest request, HttpServletResponse response) throws IOException
    {
        target = URIUtil.addPaths(_replacement, PathMap.pathInfo(_pattern,target));   
        return target;
    }

    /* ------------------------------------------------------------ */
    public void applyURI(Request request, String oldTarget, String newTarget) throws IOException 
    {
        String uri = URIUtil.addPaths(_replacement, PathMap.pathInfo(_pattern,request.getRequestURI()));
        request.setRequestURI(uri);
    }

    /* ------------------------------------------------------------ */
    /**
     * Returns the replacement string.
     */
    public String toString()
    {
        return super.toString()+"["+_replacement+"]";
    }
}