1 /* 2 * Copyright (C) 2007 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 com.google.common.collect.Lists; 20 21 import java.io.ByteArrayInputStream; 22 import java.io.FilterInputStream; 23 import java.io.IOException; 24 import java.io.InputStream; 25 import java.util.Collections; 26 import java.util.List; 27 28 /** 29 * Test class for {@link MultiInputStream}. 30 * 31 * @author Chris Nokleberg 32 */ 33 public class MultiInputStreamTest extends IoTestCase { 34 testJoin()35 public void testJoin() throws Exception { 36 joinHelper(0); 37 joinHelper(1); 38 joinHelper(0, 0, 0); 39 joinHelper(10, 20); 40 joinHelper(10, 0, 20); 41 joinHelper(0, 10, 20); 42 joinHelper(10, 20, 0); 43 joinHelper(10, 20, 1); 44 joinHelper(1, 1, 1, 1, 1, 1, 1, 1); 45 joinHelper(1, 0, 1, 0, 1, 0, 1, 0); 46 } 47 testOnlyOneOpen()48 public void testOnlyOneOpen() throws Exception { 49 final InputSupplier<InputStream> supplier = newByteSupplier(0, 50); 50 final int[] counter = new int[1]; 51 InputSupplier<InputStream> checker = new InputSupplier<InputStream>() { 52 @Override 53 public InputStream getInput() throws IOException { 54 if (counter[0]++ != 0) { 55 throw new IllegalStateException("More than one supplier open"); 56 } 57 return new FilterInputStream(supplier.getInput()) { 58 @Override public void close() throws IOException { 59 super.close(); 60 counter[0]--; 61 } 62 }; 63 } 64 }; 65 @SuppressWarnings("unchecked") 66 byte[] result = ByteStreams.toByteArray( 67 ByteStreams.join(checker, checker, checker)); 68 assertEquals(150, result.length); 69 } 70 joinHelper(Integer... spans)71 private void joinHelper(Integer... spans) throws Exception { 72 List<InputSupplier<InputStream>> suppliers = Lists.newArrayList(); 73 int start = 0; 74 for (Integer span : spans) { 75 suppliers.add(newByteSupplier(start, span)); 76 start += span; 77 } 78 InputSupplier<InputStream> joined = ByteStreams.join(suppliers); 79 assertTrue(ByteStreams.equal(newByteSupplier(0, start), joined)); 80 } 81 testReadSingleByte()82 public void testReadSingleByte() throws Exception { 83 InputSupplier<InputStream> supplier = newByteSupplier(0, 10); 84 @SuppressWarnings("unchecked") 85 InputSupplier<InputStream> joined = ByteStreams.join(supplier, supplier); 86 assertEquals(20, ByteStreams.length(joined)); 87 InputStream in = joined.getInput(); 88 assertFalse(in.markSupported()); 89 assertEquals(10, in.available()); 90 int total = 0; 91 while (in.read() != -1) { 92 total++; 93 } 94 assertEquals(0, in.available()); 95 assertEquals(20, total); 96 } 97 testSkip()98 public void testSkip() throws Exception { 99 MultiInputStream multi = new MultiInputStream( 100 Collections.singleton(new InputSupplier<InputStream>() { 101 @Override 102 public InputStream getInput() { 103 return new ByteArrayInputStream(newPreFilledByteArray(0, 50)) { 104 @Override public long skip(long n) { 105 return 0; 106 } 107 }; 108 } 109 }).iterator()); 110 multi.skip(-1); 111 multi.skip(-1); 112 multi.skip(0); 113 ByteStreams.skipFully(multi, 20); 114 assertEquals(20, multi.read()); 115 } 116 newByteSupplier(final int start, final int size)117 private static InputSupplier<InputStream> newByteSupplier(final int start, final int size) { 118 return new InputSupplier<InputStream>() { 119 @Override 120 public InputStream getInput() { 121 return new ByteArrayInputStream(newPreFilledByteArray(start, size)); 122 } 123 }; 124 } 125 } 126