package de.mpiwg.itgroup.annotations.restlet.utils;

/*
 * #%L
 * AnnotationManager
 * %%
 * Copyright (C) 2012 - 2015 MPIWG Berlin
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import org.restlet.Request;
import org.restlet.Response;
import org.restlet.data.Reference;
import org.restlet.routing.Filter;

/**
 * Filter that adds a prefix path to all internally generated URLs.
 * 
 * @author casties
 *
 */
public class UrlPrefixFilter extends Filter {

    private String prefix = null;

    /**
     * Set the prefix to add.
     * 
     * @param prefix
     */
    public void setPrefix(String prefix) {
        if (!prefix.startsWith("/")) {
            prefix = "/" + prefix;
        }
        this.prefix = prefix;
    }

    @Override
    protected int beforeHandle(Request request, Response response) {
        // get ref to change
        Reference ref = request.getResourceRef();
        String path = ref.getPath();
        // add prefix to path
        ref.setPath(prefix + path);
        // change baseRef as well
        Reference baseRef = ref.getBaseRef();
        String basePath = baseRef.getPath();
        // add prefix to base ref path
        baseRef.setPath(prefix + basePath);
        return super.beforeHandle(request, response);
    }

}