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

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Here is the source code for com.cyclopsgroup.waterview.impl.servlet.MultipartServletRequestParameters.java

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/* ==========================================================================
 * Copyright 2002-2005 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.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.FileUploadException;

import com.cyclopsgroup.waterview.MapParameters;

/**
 * Multipart servlet request value parser
 * 
 * @author <a href="mailto:jiaqi.guo@gmail.com">Jiaqi Guo </a>
 */
public class MultipartServletRequestParameters extends MapParameters {
    private final Map<String, List<FileItem>> fileItems = new HashMap<String, List<FileItem>>();

    /**
     * Constructor for class MultipartServletRequestValueParser
     *
     * @param request Http request object
     * @param fileUpload File upload object
     * @throws FileUploadException Throw it out
     */
    public MultipartServletRequestParameters(HttpServletRequest request, FileUploadBase fileUpload)
            throws FileUploadException {
        for (Object item : fileUpload.parseRequest(request)) {
            FileItem fileItem = (FileItem) item;
            if (fileItem.isFormField()) {
                add(fileItem.getFieldName(), fileItem.getString());
            } else {
                List<FileItem> list = fileItems.get(fileItem.getFieldName());
                if (list == null) {
                    list = new ArrayList<FileItem>();
                    fileItems.put(fileItem.getFieldName(), list);
                }
                list.add(fileItem);
            }
        }
    }

    /**
     * Overwrite or implement method doGetValue()
     * @see com.cyclopsgroup.waterview.Attributes#doGetValue(java.lang.String)
     */
    @Override
    protected String doGetValue(String name) throws Exception {
        List<String> values = doGetValues(name);
        return values.isEmpty() ? null : values.get(0);
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.Parameters#getFileItem(java.lang.String)
     */
    @Override
    public FileItem getFileItem(String name) {
        Collection<FileItem> items = getFileItems(name);
        return items.size() == 0 ? null : items.iterator().next();
    }

    /**
     * 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) {
        List<FileItem> items = fileItems.get(name);
        if (items == null) {
            items = Collections.emptyList();
        }
        return items;
    }
}