| /* |
| * 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. |
| */ |
| package org.apache.olingo.server.core.serializer; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.UnsupportedEncodingException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.Channels; |
| import java.nio.channels.ReadableByteChannel; |
| import java.nio.channels.WritableByteChannel; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.olingo.commons.api.http.HttpStatusCode; |
| import org.apache.olingo.server.api.ODataResponse; |
| import org.apache.olingo.server.api.serializer.SerializerException; |
| |
| public class AsyncResponseSerializer { |
| private static final int BUFFER_SIZE = 8192; |
| private static final String COLON = ":"; |
| private static final String SP = " "; |
| private static final String CRLF = "\r\n"; |
| private static final String HEADER_CHARSET_NAME = "ISO-8859-1"; |
| private static final String HTTP_VERSION = "HTTP/1.1"; |
| |
| public InputStream serialize(final ODataResponse response) throws SerializerException { |
| try { |
| ByteArrayOutputStream buffer = new ByteArrayOutputStream(); |
| appendStatusLine(response, buffer); |
| appendResponseHeader(response, buffer); |
| append(CRLF, buffer); |
| appendBody(response, buffer); |
| |
| buffer.flush(); |
| return new ByteArrayInputStream(buffer.toByteArray(), 0, buffer.size()); |
| } catch (IOException e) { |
| throw new SerializerException("Exception occurred during serialization of asynchronous response.", |
| e, SerializerException.MessageKeys.IO_EXCEPTION); |
| } |
| } |
| |
| private void appendResponseHeader(final ODataResponse response, |
| final ByteArrayOutputStream buffer) throws IOException { |
| final Map<String, List<String>> header = response.getAllHeaders(); |
| |
| for (final Map.Entry<String, List<String>> entry : header.entrySet()) { |
| appendHeader(entry.getKey(), entry.getValue(), buffer); |
| } |
| } |
| |
| private void appendHeader(final String name, final List<String> values, final ByteArrayOutputStream buffer) |
| throws IOException { |
| for (String value : values) { |
| append(name + COLON + SP + value + CRLF, buffer); |
| } |
| } |
| |
| private void appendStatusLine(final ODataResponse response, final ByteArrayOutputStream buffer) |
| throws IOException { |
| HttpStatusCode status = HttpStatusCode.fromStatusCode(response.getStatusCode()); |
| append(HTTP_VERSION + SP + response.getStatusCode() + SP + status + CRLF, buffer); |
| } |
| |
| private void appendBody(final ODataResponse response, final ByteArrayOutputStream buffer) throws IOException { |
| InputStream input = response.getContent(); |
| if (input != null) { |
| ByteBuffer inBuffer = ByteBuffer.allocate(BUFFER_SIZE); |
| try (ReadableByteChannel ic = Channels.newChannel(input)) { |
| try (WritableByteChannel oc = Channels.newChannel(buffer)) { |
| while (ic.read(inBuffer) > 0) { |
| inBuffer.flip(); |
| oc.write(inBuffer); |
| inBuffer.rewind(); |
| } |
| } |
| } |
| } |
| } |
| |
| private void append(final String value, final ByteArrayOutputStream buffer) throws IOException { |
| try { |
| buffer.write(value.getBytes(HEADER_CHARSET_NAME)); |
| } catch (UnsupportedEncodingException e) { |
| throw new IOException("Default header charset with name '" + HEADER_CHARSET_NAME + |
| "' is not available.", e); |
| } |
| } |
| } |