| /* |
| * Copyright (C) 2007 The Guava Authors |
| * |
| * Licensed 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 com.google.common.io; |
| |
| import com.google.common.collect.Lists; |
| import java.io.ByteArrayInputStream; |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Test class for {@link MultiInputStream}. |
| * |
| * @author Chris Nokleberg |
| */ |
| public class MultiInputStreamTest extends IoTestCase { |
| |
| public void testJoin() throws Exception { |
| joinHelper(0); |
| joinHelper(1); |
| joinHelper(0, 0, 0); |
| joinHelper(10, 20); |
| joinHelper(10, 0, 20); |
| joinHelper(0, 10, 20); |
| joinHelper(10, 20, 0); |
| joinHelper(10, 20, 1); |
| joinHelper(1, 1, 1, 1, 1, 1, 1, 1); |
| joinHelper(1, 0, 1, 0, 1, 0, 1, 0); |
| } |
| |
| public void testOnlyOneOpen() throws Exception { |
| final ByteSource source = newByteSource(0, 50); |
| final int[] counter = new int[1]; |
| ByteSource checker = |
| new ByteSource() { |
| @Override |
| public InputStream openStream() throws IOException { |
| if (counter[0]++ != 0) { |
| throw new IllegalStateException("More than one source open"); |
| } |
| return new FilterInputStream(source.openStream()) { |
| @Override |
| public void close() throws IOException { |
| super.close(); |
| counter[0]--; |
| } |
| }; |
| } |
| }; |
| byte[] result = ByteSource.concat(checker, checker, checker).read(); |
| assertEquals(150, result.length); |
| } |
| |
| private void joinHelper(Integer... spans) throws Exception { |
| List<ByteSource> sources = Lists.newArrayList(); |
| int start = 0; |
| for (Integer span : spans) { |
| sources.add(newByteSource(start, span)); |
| start += span; |
| } |
| ByteSource joined = ByteSource.concat(sources); |
| assertTrue(newByteSource(0, start).contentEquals(joined)); |
| } |
| |
| public void testReadSingleByte() throws Exception { |
| ByteSource source = newByteSource(0, 10); |
| ByteSource joined = ByteSource.concat(source, source); |
| assertEquals(20, joined.size()); |
| InputStream in = joined.openStream(); |
| assertFalse(in.markSupported()); |
| assertEquals(10, in.available()); |
| int total = 0; |
| while (in.read() != -1) { |
| total++; |
| } |
| assertEquals(0, in.available()); |
| assertEquals(20, total); |
| } |
| |
| @SuppressWarnings("CheckReturnValue") // these calls to skip always return 0 |
| public void testSkip() throws Exception { |
| MultiInputStream multi = |
| new MultiInputStream( |
| Collections.singleton( |
| new ByteSource() { |
| @Override |
| public InputStream openStream() { |
| return new ByteArrayInputStream(newPreFilledByteArray(0, 50)) { |
| @Override |
| public long skip(long n) { |
| return 0; |
| } |
| }; |
| } |
| }) |
| .iterator()); |
| assertEquals(0, multi.skip(-1)); |
| assertEquals(0, multi.skip(-1)); |
| assertEquals(0, multi.skip(0)); |
| ByteStreams.skipFully(multi, 20); |
| assertEquals(20, multi.read()); |
| } |
| |
| public void testReadSingle_noStackOverflow() throws IOException { |
| // https://github.com/google/guava/issues/2996 |
| // no data, just testing that there's no StackOverflowException |
| assertEquals(-1, tenMillionEmptySources().read()); |
| } |
| |
| public void testReadArray_noStackOverflow() throws IOException { |
| // https://github.com/google/guava/issues/2996 |
| // no data, just testing that there's no StackOverflowException |
| assertEquals(-1, tenMillionEmptySources().read(new byte[1])); |
| } |
| |
| private static MultiInputStream tenMillionEmptySources() throws IOException { |
| return new MultiInputStream(Collections.nCopies(10_000_000, ByteSource.empty()).iterator()); |
| } |
| |
| private static ByteSource newByteSource(final int start, final int size) { |
| return new ByteSource() { |
| @Override |
| public InputStream openStream() { |
| return new ByteArrayInputStream(newPreFilledByteArray(start, size)); |
| } |
| }; |
| } |
| } |