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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 java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.Writer;
/**
* Unit test for {@link AppendableWriter}.
*
* @author Alan Green
*/
public class AppendableWriterTest extends IoTestCase {
/** Helper class for testing behavior with Flushable and Closeable targets. */
private static class SpyAppendable implements Appendable, Flushable, Closeable {
boolean flushed;
boolean closed;
StringBuilder result = new StringBuilder();
@Override
public Appendable append(CharSequence csq) {
result.append(csq);
return this;
}
@Override
public Appendable append(char c) {
result.append(c);
return this;
}
@Override
public Appendable append(CharSequence csq, int start, int end) {
result.append(csq, start, end);
return this;
}
@Override
public void flush() {
flushed = true;
}
@Override
public void close() {
closed = true;
}
}
public void testWriteMethods() throws IOException {
StringBuilder builder = new StringBuilder();
Writer writer = new AppendableWriter(builder);
writer.write("Hello".toCharArray());
writer.write(',');
writer.write(0xBEEF0020); // only lower 16 bits are important
writer.write("Wo");
writer.write("Whirled".toCharArray(), 3, 2);
writer.write("Mad! Mad, I say", 2, 2);
assertEquals("Hello, World!", builder.toString());
}
public void testAppendMethods() throws IOException {
StringBuilder builder = new StringBuilder();
Writer writer = new AppendableWriter(builder);
writer.append("Hello,");
writer.append(' ');
writer.append("The World Wide Web", 4, 9);
writer.append("!");
assertEquals("Hello, World!", builder.toString());
}
public void testCloseFlush() throws IOException {
SpyAppendable spy = new SpyAppendable();
Writer writer = new AppendableWriter(spy);
writer.write("Hello");
assertFalse(spy.flushed);
assertFalse(spy.closed);
writer.flush();
assertTrue(spy.flushed);
assertFalse(spy.closed);
writer.close();
assertTrue(spy.flushed);
assertTrue(spy.closed);
}
public void testCloseIsFinal() throws IOException {
StringBuilder builder = new StringBuilder();
Writer writer = new AppendableWriter(builder);
writer.write("Hi");
writer.close();
try {
writer.write(" Greg");
fail("Should have thrown IOException due to writer already closed");
} catch (IOException expected) {
}
try {
writer.flush();
fail("Should have thrown IOException due to writer already closed");
} catch (IOException expected) {
}
// close()ing already closed writer is allowed
writer.close();
}
}
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