Java tutorial
/** * Copyright (c) 2014 Netheos (http://www.netheos.net) * * 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 net.netheos.pcsapi.request; import net.netheos.pcsapi.bytesio.ByteSource; import net.netheos.pcsapi.utils.PcsUtils; import org.apache.http.entity.mime.MIME; import org.apache.http.entity.mime.content.AbstractContentBody; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; /** * Adapter class to represent a byte source as an http entity (for uploads). */ public class ByteSourceBody extends AbstractContentBody { private final ByteSource byteSource; private InputStream currentStream; private final String filename; public ByteSourceBody(ByteSource bs, String filename, String contentType) { super(contentType != null ? contentType : "application/octet-stream"); this.byteSource = bs; this.filename = filename; } public InputStream getContent() throws IOException, IllegalStateException { if (currentStream != null) { // should never happen // defensive code : we close any opened stream PcsUtils.closeQuietly(currentStream); } currentStream = byteSource.openStream(); return currentStream; } @Override public void writeTo(OutputStream outstream) throws IOException { if (outstream == null) { throw new IllegalArgumentException("Output stream may not be null"); } InputStream instream = getContent(); try { byte[] buffer = new byte[4096]; int n; while ((n = instream.read(buffer)) != -1) { outstream.write(buffer, 0, n); } } finally { PcsUtils.closeQuietly(instream); consumeContent(); } } public void consumeContent() throws IOException { if (currentStream != null) { PcsUtils.closeQuietly(currentStream); currentStream = null; } } @Override public String getCharset() { return null; } @Override public String getTransferEncoding() { return MIME.ENC_BINARY; } @Override public String getFilename() { return filename; } @Override public long getContentLength() { return byteSource.length(); } }