com.cyclopsgroup.waterview.core.ParseURLValve.java Source code

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Here is the source code for com.cyclopsgroup.waterview.core.ParseURLValve.java

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/* ==========================================================================
 * Copyright 2002-2004 Cyclops Group Community
 *
 * Licensed under the Open Software License, Version 2.1 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://opensource.org/licenses/osl-2.1.php
 *
 *  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 com.cyclopsgroup.waterview.core;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;

import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.commons.lang.StringUtils;

import com.cyclopsgroup.waterview.Link;
import com.cyclopsgroup.waterview.RuntimeData;
import com.cyclopsgroup.waterview.spi.PipelineContext;
import com.cyclopsgroup.waterview.spi.Valve;

/**
 * Valve to prepare information contained by URL
 *
 * @author <a href="mailto:jiaqi.guo@gmail.com">Jiaqi Guo </a>
 */
public class ParseURLValve extends AbstractLogEnabled implements Valve {

    private static HashSet instructors;

    private static HashSet getInstructors() {
        if (instructors == null) {
            instructors = new HashSet();
            instructors.add(Link.ACTION_INSTRUCTOR);
            instructors.add(Link.PAGE_INSTRUCTOR);
        }
        return instructors;
    }

    /**
     * @param requestPath
     * @return list of parts
     */
    static List parseRequestPath(String requestPath) {
        List ret = new ArrayList();
        String[] parts = StringUtils.split(requestPath, '/');
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < parts.length; i++) {
            String part = parts[i];
            if (getInstructors().contains(part) && sb.length() != 0) {
                ret.add(sb.toString());
                sb = new StringBuffer();
            }
            sb.append('/').append(part);
        }
        ret.add(sb.toString());
        return ret;
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.spi.Valve#invoke(com.cyclopsgroup.waterview.RuntimeData, com.cyclopsgroup.waterview.spi.PipelineContext)
     */
    public void invoke(RuntimeData data, PipelineContext context) throws Exception {
        List behaviors = parseRequestPath(data.getRequestPath());
        for (Iterator i = behaviors.iterator(); i.hasNext();) {
            String behavior = (String) i.next();
            if (behavior.startsWith('/' + Link.ACTION_INSTRUCTOR)) {
                String action = behavior.substring(Link.ACTION_INSTRUCTOR.length() + 1);
                data.getActions().add(action);
            } else if (behavior.startsWith('/' + Link.PAGE_INSTRUCTOR)) {
                String page = behavior.substring(Link.PAGE_INSTRUCTOR.length() + 1);
                data.setPage(page);
            } else {
                data.setPage(behavior);
            }
        }

        Locale locale = (Locale) data.getSessionContext().get(RuntimeData.LOCALE_NAME);
        if (locale != null) {
            data.setLocale(locale);
        }
        context.invokeNextValve(data);
    }
}