com.cyclopsgroup.waterview.impl.servlet.ServletRequestParameters.java Source code

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Here is the source code for com.cyclopsgroup.waterview.impl.servlet.ServletRequestParameters.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.impl.servlet;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.fileupload.FileItem;

import com.cyclopsgroup.waterview.Parameters;

/**
 * Servet request implemented value parser
 * 
 * @author <a href="mailto:jiiaqi@yahoo.com">Jiaqi Guo </a>
 */
public class ServletRequestParameters extends Parameters {
    private final ConcurrentMap<String, List<String>> extra = new ConcurrentHashMap<String, List<String>>();

    private final HttpServletRequest httpServletRequest;

    /**
     * Constructor of HttpRequestValueParser
     * 
     * @param request Servlet request
     */
    public ServletRequestParameters(HttpServletRequest request) {
        httpServletRequest = request;
    }

    @Override
    public void doAddAttribute(String name, String value) {
        //Kind of heavy. But who cares since add method is called rarely
        List<String> values = extra.putIfAbsent(name, new ArrayList<String>());
        values.add(value);
    }

    /**
     * Override method doGetAttributeNames in class ServletRequestValueParser
     *
     * @see com.cyclopsgroup.waterview.Attributes#doGetAttributeNames()
     */
    @Override
    protected Set<String> doGetAttributeNames() {
        HashSet<String> names = new HashSet<String>();
        CollectionUtils.addAll(names, httpServletRequest.getParameterNames());
        if (!extra.isEmpty()) {
            names.addAll(extra.keySet());
        }
        return names;
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.Parameters#doGetValue(java.lang.String)
     */
    @Override
    protected String doGetValue(String name) throws Exception {
        String ret = httpServletRequest.getParameter(name);
        if (ret == null && extra.containsKey(name)) {
            List<String> c = extra.get(name);
            if (c != null && !c.isEmpty()) {
                ret = c.iterator().next();
            }
        }
        return ret;
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.Parameters#doGetValues(java.lang.String)
     */
    @Override
    protected List<String> doGetValues(String name) throws Exception {
        List<String> list = new ArrayList<String>();
        CollectionUtils.addAll(list, httpServletRequest.getParameterValues(name));
        if (extra.containsKey(name)) {
            list.addAll(extra.get(name));
        }
        return list;
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.Parameters#remove(java.lang.String)
     */
    @Override
    public void doRemoveAttribute(String name) {
        extra.remove(name);
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.Parameters#getFileItem(java.lang.String)
     */
    @Override
    public FileItem getFileItem(String name) {
        return null;
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.Parameters#getFileItems(java.lang.String)
     */
    @Override
    public List<FileItem> getFileItems(String name) {
        return Collections.emptyList();
    }
}