HttpServletRequestParameterMap.java :  » Workflow-Engines » spring-webflow-2.0.8 » org » springframework » webflow » context » servlet » Java Open Source

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spring webflow 2.0.8 » org » springframework » webflow » context » servlet » HttpServletRequestParameterMap.java
/*
 * Copyright 2004-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 org.springframework.webflow.context.servlet;

import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;

import org.springframework.binding.collection.CompositeIterator;
import org.springframework.binding.collection.StringKeyedMapAdapter;
import org.springframework.util.Assert;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.webflow.core.collection.CollectionUtils;

/**
 * Map backed by the Servlet HTTP request parameter map for accessing request parameters. Also provides support for
 * multi-part requests, providing transparent access to the request "fileMap" as a request parameter entry.
 * 
 * @author Keith Donald
 */
public class HttpServletRequestParameterMap extends StringKeyedMapAdapter {

  /**
   * The wrapped HTTP request.
   */
  private HttpServletRequest request;

  /**
   * Create a new map wrapping the parameters of given request.
   */
  public HttpServletRequestParameterMap(HttpServletRequest request) {
    Assert.notNull(request, "The HTTP servlet request is required");
    this.request = request;
  }

  protected Object getAttribute(String key) {
    if (request instanceof MultipartHttpServletRequest) {
      MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
      Object data = multipartRequest.getFileMap().get(key);
      if (data != null) {
        return data;
      }
    }
    String[] parameters = request.getParameterValues(key);
    if (parameters == null) {
      return null;
    } else if (parameters.length == 1) {
      return parameters[0];
    } else {
      return parameters;
    }
  }

  protected void setAttribute(String key, Object value) {
    throw new UnsupportedOperationException("HttpServletRequest parameter maps are immutable");
  }

  protected void removeAttribute(String key) {
    throw new UnsupportedOperationException("HttpServletRequest parameter maps are immutable");
  }

  protected Iterator getAttributeNames() {
    if (request instanceof MultipartHttpServletRequest) {
      MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
      CompositeIterator iterator = new CompositeIterator();
      iterator.add(multipartRequest.getFileMap().keySet().iterator());
      iterator.add(CollectionUtils.toIterator(request.getParameterNames()));
      return iterator;
    } else {
      return CollectionUtils.toIterator(request.getParameterNames());
    }
  }
}
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