1 /* 2 * Copyright (C) 2012 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of 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, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.io; 18 19 import static com.google.common.base.Preconditions.checkNotNull; 20 import static com.google.common.io.TestOption.CLOSE_THROWS; 21 import static com.google.common.io.TestOption.OPEN_THROWS; 22 import static com.google.common.io.TestOption.WRITE_THROWS; 23 24 import com.google.common.collect.ImmutableSet; 25 26 import java.io.FilterOutputStream; 27 import java.io.IOException; 28 import java.io.OutputStream; 29 import java.util.Arrays; 30 31 /** 32 * @author Colin Decker 33 */ 34 public class TestOutputStream extends FilterOutputStream { 35 36 private final ImmutableSet<TestOption> options; 37 private boolean closed; 38 TestOutputStream(OutputStream out, TestOption... options)39 public TestOutputStream(OutputStream out, TestOption... options) throws IOException { 40 this(out, Arrays.asList(options)); 41 } 42 TestOutputStream(OutputStream out, Iterable<TestOption> options)43 public TestOutputStream(OutputStream out, Iterable<TestOption> options) throws IOException { 44 super(checkNotNull(out)); 45 this.options = ImmutableSet.copyOf(options); 46 throwIf(OPEN_THROWS); 47 } 48 closed()49 public boolean closed() { 50 return closed; 51 } 52 53 @Override write(byte[] b, int off, int len)54 public void write(byte[] b, int off, int len) throws IOException { 55 throwIf(closed); 56 throwIf(WRITE_THROWS); 57 super.write(b, off, len); 58 } 59 60 @Override write(int b)61 public void write(int b) throws IOException { 62 throwIf(closed); 63 throwIf(WRITE_THROWS); 64 super.write(b); 65 } 66 67 @Override close()68 public void close() throws IOException { 69 closed = true; 70 super.close(); 71 throwIf(CLOSE_THROWS); 72 } 73 throwIf(TestOption option)74 private void throwIf(TestOption option) throws IOException { 75 throwIf(options.contains(option)); 76 } 77 throwIf(boolean condition)78 private static void throwIf(boolean condition) throws IOException { 79 if (condition) { 80 throw new IOException(); 81 } 82 } 83 } 84