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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.io.input;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.io.IOException;
import java.io.InputStream;
import org.junit.jupiter.api.Test;
public class MarkShieldInputStreamTest {
private static final class MarkTestableInputStream extends ProxyInputStream {
int markcount;
int readlimit;
public MarkTestableInputStream(final InputStream in) {
super(in);
}
@SuppressWarnings("sync-override")
@Override
public void mark(final int readlimit) {
// record that `mark` was called
this.markcount++;
this.readlimit = readlimit;
// invoke on super
super.mark(readlimit);
}
}
@Test
public void markIsNoOpWhenUnderlyingDoesNotSupport() throws IOException {
try (MarkTestableInputStream in = new MarkTestableInputStream(new NullInputStream(64, false, false));
final MarkShieldInputStream msis = new MarkShieldInputStream(in)) {
msis.mark(1024);
assertEquals(0, in.markcount);
assertEquals(0, in.readlimit);
}
}
@Test
public void markIsNoOpWhenUnderlyingSupports() throws IOException {
try (MarkTestableInputStream in = new MarkTestableInputStream(new NullInputStream(64, true, false));
final MarkShieldInputStream msis = new MarkShieldInputStream(in)) {
msis.mark(1024);
assertEquals(0, in.markcount);
assertEquals(0, in.readlimit);
}
}
@Test
public void markSupportedIsFalseWhenUnderlyingFalse() throws IOException {
// test wrapping an underlying stream which does NOT support marking
try (InputStream is = new NullInputStream(64, false, false)) {
assertFalse(is.markSupported());
try (MarkShieldInputStream msis = new MarkShieldInputStream(is)) {
assertFalse(msis.markSupported());
}
}
}
@Test
public void markSupportedIsFalseWhenUnderlyingTrue() throws IOException {
// test wrapping an underlying stream which supports marking
try (InputStream is = new NullInputStream(64, true, false)) {
assertTrue(is.markSupported());
try (MarkShieldInputStream msis = new MarkShieldInputStream(is)) {
assertFalse(msis.markSupported());
}
}
}
@Test
public void resetThrowsExceptionWhenUnderlyingDoesNotSupport() throws IOException {
// test wrapping an underlying stream which does NOT support marking
try (MarkShieldInputStream msis = new MarkShieldInputStream(
new NullInputStream(64, false, false))) {
assertThrows(UnsupportedOperationException.class, msis::reset);
}
}
@Test
public void resetThrowsExceptionWhenUnderlyingSupports() throws IOException {
// test wrapping an underlying stream which supports marking
try (MarkShieldInputStream msis = new MarkShieldInputStream(
new NullInputStream(64, true, false))) {
assertThrows(UnsupportedOperationException.class, msis::reset);
}
}
}
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