| /* |
| * 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.giraph.utils; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.nio.ByteOrder; |
| |
| import io.netty.buffer.Unpooled; |
| import io.netty.buffer.ByteBuf; |
| |
| /** |
| * Special output stream that can grow as needed and dumps to a |
| * DynamicChannelBuffer. |
| */ |
| public class DynamicChannelBufferOutputStream implements DataOutput { |
| /** Internal dynamic channel buffer */ |
| private ByteBuf buffer; |
| |
| /** |
| * Constructor |
| * |
| * @param estimatedLength Estimated length of the buffer |
| */ |
| public DynamicChannelBufferOutputStream(int estimatedLength) { |
| buffer = Unpooled.unreleasableBuffer(Unpooled.buffer(estimatedLength)) |
| .order(ByteOrder.LITTLE_ENDIAN); |
| // -- TODO unresolved what are benefits of using releasable? |
| // currently nit because it is just used in 1 test file |
| } |
| |
| /** |
| * Constructor with the buffer to use |
| * |
| * @param buffer Buffer to be written to (cleared before use) |
| */ |
| public DynamicChannelBufferOutputStream(ByteBuf buffer) { |
| this.buffer = buffer; |
| buffer.clear(); |
| } |
| |
| /** |
| * Get the dynamic channel buffer |
| * |
| * @return dynamic channel buffer (not a copy) |
| */ |
| public ByteBuf getDynamicChannelBuffer() { |
| return buffer; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| buffer.writeByte(b); |
| } |
| |
| @Override |
| public void write(byte[] b) throws IOException { |
| buffer.writeBytes(b); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| buffer.writeBytes(b, off, len); |
| } |
| |
| @Override |
| public void writeBoolean(boolean v) throws IOException { |
| buffer.writeByte(v ? 1 : 0); |
| } |
| |
| @Override |
| public void writeByte(int v) throws IOException { |
| buffer.writeByte(v); |
| } |
| |
| @Override |
| public void writeShort(int v) throws IOException { |
| buffer.writeShort(v); |
| } |
| |
| @Override |
| public void writeChar(int v) throws IOException { |
| buffer.writeChar(v); |
| } |
| |
| @Override |
| public void writeInt(int v) throws IOException { |
| buffer.writeInt(v); |
| } |
| |
| @Override |
| public void writeLong(long v) throws IOException { |
| buffer.writeLong(v); |
| } |
| |
| @Override |
| public void writeFloat(float v) throws IOException { |
| buffer.writeFloat(v); |
| } |
| |
| @Override |
| public void writeDouble(double v) throws IOException { |
| buffer.writeDouble(v); |
| } |
| |
| @Override |
| public void writeBytes(String s) throws IOException { |
| // Note that this code is mostly copied from DataOutputStream |
| int len = s.length(); |
| for (int i = 0; i < len; i++) { |
| buffer.writeByte((byte) s.charAt(i)); |
| } |
| } |
| |
| @Override |
| public void writeChars(String s) throws IOException { |
| // Note that this code is mostly copied from DataOutputStream |
| int len = s.length(); |
| for (int i = 0; i < len; i++) { |
| int v = s.charAt(i); |
| buffer.writeByte((v >>> 8) & 0xFF); |
| buffer.writeByte((v >>> 0) & 0xFF); |
| } |
| } |
| |
| @Override |
| public void writeUTF(String s) throws IOException { |
| // Note that this code is mostly copied from DataOutputStream |
| int strlen = s.length(); |
| int utflen = 0; |
| int c; |
| |
| /* use charAt instead of copying String to char array */ |
| for (int i = 0; i < strlen; i++) { |
| c = s.charAt(i); |
| if ((c >= 0x0001) && (c <= 0x007F)) { |
| utflen++; |
| } else if (c > 0x07FF) { |
| utflen += 3; |
| } else { |
| utflen += 2; |
| } |
| } |
| |
| buffer.writeByte((byte) ((utflen >>> 8) & 0xFF)); |
| buffer.writeByte((byte) ((utflen >>> 0) & 0xFF)); |
| |
| int i = 0; |
| for (i = 0; i < strlen; i++) { |
| c = s.charAt(i); |
| if (!((c >= 0x0001) && (c <= 0x007F))) { |
| break; |
| } |
| buffer.writeByte((byte) c); |
| } |
| |
| for (; i < strlen; i++) { |
| c = s.charAt(i); |
| if ((c >= 0x0001) && (c <= 0x007F)) { |
| buffer.writeByte((byte) c); |
| |
| } else if (c > 0x07FF) { |
| buffer.writeByte((byte) (0xE0 | ((c >> 12) & 0x0F))); |
| buffer.writeByte((byte) (0x80 | ((c >> 6) & 0x3F))); |
| buffer.writeByte((byte) (0x80 | ((c >> 0) & 0x3F))); |
| } else { |
| buffer.writeByte((byte) (0xC0 | ((c >> 6) & 0x1F))); |
| buffer.writeByte((byte) (0x80 | ((c >> 0) & 0x3F))); |
| } |
| } |
| } |
| } |