1 /* 2 * Copyright 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 5 * use this file except in compliance with the License. You may obtain a copy of 6 * the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 13 * License for the specific language governing permissions and limitations under 14 * the License. 15 */ 16 17 package java.io; 18 19 public abstract class InputStream implements Closeable { read()20 public abstract int read () throws IOException; 21 read(byte[] buf, int start, int len)22 public int read (byte[] buf, int start, int len) throws IOException { 23 24 int end = start + len; 25 for (int i = start; i < end; i++) { 26 int r = read(); 27 if (r == -1) { 28 return i == start ? -1 : i - start; 29 } 30 buf[i] = (byte)r; 31 } 32 return len; 33 } 34 read(byte[] buf)35 public int read (byte[] buf) throws IOException { 36 return read(buf, 0, buf.length); 37 } 38 close()39 public void close () throws IOException { 40 41 } 42 available()43 public int available () { 44 return 0; 45 } 46 } 47