| /** |
| * 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.hadoop.record; |
| |
| import java.io.DataInput; |
| import java.io.IOException; |
| import java.io.DataInputStream; |
| import java.io.InputStream; |
| |
| /** |
| */ |
| public class BinaryRecordInput implements RecordInput { |
| |
| private DataInput in; |
| |
| static private class BinaryIndex implements Index { |
| private int nelems; |
| private BinaryIndex(int nelems) { |
| this.nelems = nelems; |
| } |
| public boolean done() { |
| return (nelems <= 0); |
| } |
| public void incr() { |
| nelems--; |
| } |
| } |
| |
| private BinaryRecordInput() {} |
| |
| private void setDataInput(DataInput inp) { |
| this.in = inp; |
| } |
| |
| private static ThreadLocal bIn = new ThreadLocal() { |
| protected synchronized Object initialValue() { |
| return new BinaryRecordInput(); |
| } |
| }; |
| |
| /** |
| * Get a thread-local record input for the supplied DataInput. |
| * @param inp data input stream |
| * @return binary record input corresponding to the supplied DataInput. |
| */ |
| public static BinaryRecordInput get(DataInput inp) { |
| BinaryRecordInput bin = (BinaryRecordInput) bIn.get(); |
| bin.setDataInput(inp); |
| return bin; |
| } |
| |
| /** Creates a new instance of BinaryRecordInput */ |
| public BinaryRecordInput(InputStream strm) { |
| this.in = new DataInputStream(strm); |
| } |
| |
| /** Creates a new instance of BinaryRecordInput */ |
| public BinaryRecordInput(DataInput din) { |
| this.in = din; |
| } |
| |
| public byte readByte(final String tag) throws IOException { |
| return in.readByte(); |
| } |
| |
| public boolean readBool(final String tag) throws IOException { |
| return in.readBoolean(); |
| } |
| |
| public int readInt(final String tag) throws IOException { |
| return Utils.readVInt(in); |
| } |
| |
| public long readLong(final String tag) throws IOException { |
| return Utils.readVLong(in); |
| } |
| |
| public float readFloat(final String tag) throws IOException { |
| return in.readFloat(); |
| } |
| |
| public double readDouble(final String tag) throws IOException { |
| return in.readDouble(); |
| } |
| |
| public String readString(final String tag) throws IOException { |
| return Utils.fromBinaryString(in); |
| } |
| |
| public Buffer readBuffer(final String tag) throws IOException { |
| final int len = Utils.readVInt(in); |
| final byte[] barr = new byte[len]; |
| in.readFully(barr); |
| return new Buffer(barr); |
| } |
| |
| public void startRecord(final String tag) throws IOException { |
| // no-op |
| } |
| |
| public void endRecord(final String tag) throws IOException { |
| // no-op |
| } |
| |
| public Index startVector(final String tag) throws IOException { |
| return new BinaryIndex(readInt(tag)); |
| } |
| |
| public void endVector(final String tag) throws IOException { |
| // no-op |
| } |
| |
| public Index startMap(final String tag) throws IOException { |
| return new BinaryIndex(readInt(tag)); |
| } |
| |
| public void endMap(final String tag) throws IOException { |
| // no-op |
| } |
| } |