1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.hadoop.hbase.io; 20 21 import java.io.DataInput; 22 import java.io.IOException; 23 import java.io.InputStream; 24 25 import org.apache.hadoop.hbase.classification.InterfaceAudience; 26 27 /** 28 * An InputStream that wraps a DataInput. 29 * @see DataOutputOutputStream 30 */ 31 @InterfaceAudience.Private 32 public class DataInputInputStream extends InputStream { 33 34 private DataInput in; 35 36 /** 37 * Construct an InputStream from the given DataInput. If 'in' 38 * is already an InputStream, simply returns it. Otherwise, wraps 39 * it in an InputStream. 40 * @param in the DataInput to wrap 41 * @return an InputStream instance that reads from 'in' 42 */ 43 public static InputStream constructInputStream(DataInput in) { 44 if (in instanceof InputStream) { 45 return (InputStream)in; 46 } else { 47 return new DataInputInputStream(in); 48 } 49 } 50 51 52 public DataInputInputStream(DataInput in) { 53 this.in = in; 54 } 55 56 @Override 57 public int read() throws IOException { 58 return in.readUnsignedByte(); 59 } 60 }