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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/entity/BufferedHttpEntity.java $
+ * $Revision: 496070 $
+ * $Date: 2007-01-14 04:18:34 -0800 (Sun, 14 Jan 2007) $
+ *
+ * ====================================================================
+ * 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 org.apache.http.entity;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.util.EntityUtils;
+
+/**
+ * A wrapping entity that buffers it content if necessary.
+ * The buffered entity is always repeatable.
+ * If the wrapped entity is repeatable itself, calls are passed through.
+ * If the wrapped entity is not repeatable, the content is read into a
+ * buffer once and provided from there as often as required.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ *
+ * @version $Revision: 496070 $
+ *
+ * @since 4.0
+ */
+public class BufferedHttpEntity extends HttpEntityWrapper {
+
+ private final byte[] buffer;
+
+ public BufferedHttpEntity(final HttpEntity entity) throws IOException {
+ super(entity);
+ if (!entity.isRepeatable() || entity.getContentLength() < 0) {
+ this.buffer = EntityUtils.toByteArray(entity);
+ } else {
+ this.buffer = null;
+ }
+ }
+
+ public long getContentLength() {
+ if (this.buffer != null) {
+ return this.buffer.length;
+ } else {
+ return wrappedEntity.getContentLength();
+ }
+ }
+
+ public InputStream getContent() throws IOException {
+ if (this.buffer != null) {
+ return new ByteArrayInputStream(this.buffer);
+ } else {
+ return wrappedEntity.getContent();
+ }
+ }
+
+ /**
+ * Tells that this entity does not have to be chunked.
+ *
+ * @return <code>false</code>
+ */
+ public boolean isChunked() {
+ return (buffer == null) && wrappedEntity.isChunked();
+ }
+
+ /**
+ * Tells that this entity is repeatable.
+ *
+ * @return <code>true</code>
+ */
+ public boolean isRepeatable() {
+ return true;
+ }
+
+
+ public void writeTo(final OutputStream outstream) throws IOException {
+ if (outstream == null) {
+ throw new IllegalArgumentException("Output stream may not be null");
+ }
+ if (this.buffer != null) {
+ outstream.write(this.buffer);
+ } else {
+ wrappedEntity.writeTo(outstream);
+ }
+ }
+
+
+ // non-javadoc, see interface HttpEntity
+ public boolean isStreaming() {
+ return (buffer == null) && wrappedEntity.isStreaming();
+ }
+
+} // class BufferedHttpEntity