CacheEntity.java

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package com.apigee.sdk.apm.http.impl.client.cache;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.protocol.HTTP;

import com.apigee.sdk.apm.http.annotation.Immutable;
import com.apigee.sdk.apm.http.client.cache.HttpCacheEntry;

@Immutable
class CacheEntity implements HttpEntity, Serializable {

	private static final long serialVersionUID = -3467082284120936233L;

	private final HttpCacheEntry cacheEntry;

	public CacheEntity(final HttpCacheEntry cacheEntry) {
		super();
		this.cacheEntry = cacheEntry;
	}

	public Header getContentType() {
		return this.cacheEntry.getFirstHeader(HTTP.CONTENT_TYPE);
	}

	public Header getContentEncoding() {
		return this.cacheEntry.getFirstHeader(HTTP.CONTENT_ENCODING);
	}

	public boolean isChunked() {
		return false;
	}

	public boolean isRepeatable() {
		return true;
	}

	public long getContentLength() {
		return this.cacheEntry.getResource().length();
	}

	public InputStream getContent() throws IOException {
		return this.cacheEntry.getResource().getInputStream();
	}

	public void writeTo(final OutputStream outstream) throws IOException {
		if (outstream == null) {
			throw new IllegalArgumentException("Output stream may not be null");
		}
		InputStream instream = this.cacheEntry.getResource().getInputStream();
		try {
			IOUtils.copy(instream, outstream);
		} finally {
			instream.close();
		}
	}

	public boolean isStreaming() {
		return false;
	}

	public void consumeContent() throws IOException {
	}

	public Object clone() throws CloneNotSupportedException {
		return super.clone();
	}

}