132 lines
3.3 KiB
Java
132 lines
3.3 KiB
Java
/*
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* Copyright (C) 2007 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.io;
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import java.io.Closeable;
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import java.io.Flushable;
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import java.io.IOException;
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import java.io.Writer;
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/**
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* Unit test for {@link AppendableWriter}.
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*
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* @author Alan Green
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*/
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public class AppendableWriterTest extends IoTestCase {
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/** Helper class for testing behavior with Flushable and Closeable targets. */
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private static class SpyAppendable implements Appendable, Flushable, Closeable {
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boolean flushed;
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boolean closed;
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StringBuilder result = new StringBuilder();
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@Override
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public Appendable append(CharSequence csq) {
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result.append(csq);
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return this;
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}
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@Override
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public Appendable append(char c) {
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result.append(c);
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return this;
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}
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@Override
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public Appendable append(CharSequence csq, int start, int end) {
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result.append(csq, start, end);
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return this;
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}
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@Override
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public void flush() {
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flushed = true;
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}
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@Override
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public void close() {
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closed = true;
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}
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}
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public void testWriteMethods() throws IOException {
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StringBuilder builder = new StringBuilder();
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Writer writer = new AppendableWriter(builder);
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writer.write("Hello".toCharArray());
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writer.write(',');
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writer.write(0xBEEF0020); // only lower 16 bits are important
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writer.write("Wo");
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writer.write("Whirled".toCharArray(), 3, 2);
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writer.write("Mad! Mad, I say", 2, 2);
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assertEquals("Hello, World!", builder.toString());
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}
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public void testAppendMethods() throws IOException {
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StringBuilder builder = new StringBuilder();
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Writer writer = new AppendableWriter(builder);
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writer.append("Hello,");
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writer.append(' ');
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writer.append("The World Wide Web", 4, 9);
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writer.append("!");
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assertEquals("Hello, World!", builder.toString());
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}
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public void testCloseFlush() throws IOException {
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SpyAppendable spy = new SpyAppendable();
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Writer writer = new AppendableWriter(spy);
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writer.write("Hello");
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assertFalse(spy.flushed);
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assertFalse(spy.closed);
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writer.flush();
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assertTrue(spy.flushed);
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assertFalse(spy.closed);
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writer.close();
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assertTrue(spy.flushed);
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assertTrue(spy.closed);
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}
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public void testCloseIsFinal() throws IOException {
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StringBuilder builder = new StringBuilder();
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Writer writer = new AppendableWriter(builder);
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writer.write("Hi");
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writer.close();
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try {
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writer.write(" Greg");
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fail("Should have thrown IOException due to writer already closed");
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} catch (IOException expected) {
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}
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try {
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writer.flush();
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fail("Should have thrown IOException due to writer already closed");
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} catch (IOException expected) {
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}
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// close()ing already closed writer is allowed
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writer.close();
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}
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}
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