/*
    * Copyright 2002-2012 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.mock.web.test;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Collection;
  import java.util.Collections;
  import javax.servlet.http.Part;
  
  import org.springframework.util.Assert;
  import org.springframework.util.FileCopyUtils;
  
  /**
   * Mock implementation of the {@link Part} interface.
   *
   * @author Rossen Stoyanchev
   * @since 3.1
   * @see MockHttpServletRequest
   */
  public class MockPart implements Part {
  
  	private static final String CONTENT_TYPE = "Content-Type";
  
  	private final String name;
  
  	private String contentType;
  
  	private final byte[] content;
  
  	/**
  	 * Create a new MockPart with the given content.
  	 * @param name the name of the part
  	 * @param content the content for the part
  	 */
  	public MockPart(String name, byte[] content) {
  		this(name, "", content);
  	}
  
  	/**
  	 * Create a new MockPart with the given content.
  	 * @param name the name of the part
  	 * @param contentStream the content of the part as stream
  	 * @throws IOException if reading from the stream failed
  	 */
  	public MockPart(String name, InputStream contentStream) throws IOException {
  		this(name, "", FileCopyUtils.copyToByteArray(contentStream));
  	}
  
  	/**
  	 * Create a new MockPart with the given content.
  	 * @param name the name of the file
  	 * @param contentType the content type (if known)
  	 * @param content the content of the file
  	 */
  	public MockPart(String name, String contentType, byte[] content) {
  		Assert.hasLength(name, "Name must not be null");
  		this.name = name;
  		this.contentType = contentType;
  		this.content = (content != null ? content : new byte[0]);
  	}
  
  	/**
  	 * Create a new MockPart with the given content.
  	 * @param name the name of the file
  	 * @param contentType the content type (if known)
  	 * @param contentStream the content of the part as stream
  	 * @throws IOException if reading from the stream failed
  	 */
  	public MockPart(String name, String contentType, InputStream contentStream)
  			throws IOException {
  
  		this(name, contentType, FileCopyUtils.copyToByteArray(contentStream));
  	}
  
  
  	@Override
  	public String getName() {
  		return this.name;
  	}
  
  	@Override
  	public String getContentType() {
  		return this.contentType;
 	}
 
 	@Override
 	public long getSize() {
 		return this.content.length;
 	}
 
 	@Override
 	public InputStream getInputStream() throws IOException {
 		return new ByteArrayInputStream(this.content);
 	}
 
 	@Override
 	public String getHeader(String name) {
 		if (CONTENT_TYPE.equalsIgnoreCase(name)) {
 			return this.contentType;
 		}
 		else {
 			return null;
 		}
 	}
 
 	@Override
 	public Collection<String> getHeaders(String name) {
 		if (CONTENT_TYPE.equalsIgnoreCase(name)) {
 			return Collections.singleton(this.contentType);
 		}
 		else {
 			return null;
 		}
 	}
 
 	@Override
 	public Collection<String> getHeaderNames() {
 		return Collections.singleton(CONTENT_TYPE);
 	}
 
 	@Override
 	public void write(String fileName) throws IOException {
 		throw new UnsupportedOperationException();
 	}
 
 	@Override
 	public void delete() throws IOException {
 		throw new UnsupportedOperationException();
 	}
 
 }