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/*
* 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));
}
};
}
}
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