| /* |
| * Copyright (C) 2008 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.ImmutableList; |
| import java.io.FilterReader; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import junit.framework.TestCase; |
| |
| /** @author ricebin */ |
| public class MultiReaderTest extends TestCase { |
| |
| public void testOnlyOneOpen() throws Exception { |
| String testString = "abcdefgh"; |
| final CharSource source = newCharSource(testString); |
| final int[] counter = new int[1]; |
| CharSource reader = |
| new CharSource() { |
| @Override |
| public Reader openStream() throws IOException { |
| if (counter[0]++ != 0) { |
| throw new IllegalStateException("More than one source open"); |
| } |
| return new FilterReader(source.openStream()) { |
| @Override |
| public void close() throws IOException { |
| super.close(); |
| counter[0]--; |
| } |
| }; |
| } |
| }; |
| Reader joinedReader = CharSource.concat(reader, reader, reader).openStream(); |
| String result = CharStreams.toString(joinedReader); |
| assertEquals(testString.length() * 3, result.length()); |
| } |
| |
| public void testReady() throws Exception { |
| CharSource source = newCharSource("a"); |
| Iterable<? extends CharSource> list = ImmutableList.of(source, source); |
| Reader joinedReader = CharSource.concat(list).openStream(); |
| |
| assertTrue(joinedReader.ready()); |
| assertEquals('a', joinedReader.read()); |
| assertEquals('a', joinedReader.read()); |
| assertEquals(-1, joinedReader.read()); |
| assertFalse(joinedReader.ready()); |
| } |
| |
| public void testSimple() throws Exception { |
| String testString = "abcdefgh"; |
| CharSource source = newCharSource(testString); |
| Reader joinedReader = CharSource.concat(source, source).openStream(); |
| |
| String expectedString = testString + testString; |
| assertEquals(expectedString, CharStreams.toString(joinedReader)); |
| } |
| |
| private static CharSource newCharSource(final String text) { |
| return new CharSource() { |
| @Override |
| public Reader openStream() { |
| return new StringReader(text); |
| } |
| }; |
| } |
| |
| public void testSkip() throws Exception { |
| String begin = "abcde"; |
| String end = "fghij"; |
| Reader joinedReader = CharSource.concat(newCharSource(begin), newCharSource(end)).openStream(); |
| |
| String expected = begin + end; |
| assertEquals(expected.charAt(0), joinedReader.read()); |
| CharStreams.skipFully(joinedReader, 1); |
| assertEquals(expected.charAt(2), joinedReader.read()); |
| CharStreams.skipFully(joinedReader, 4); |
| assertEquals(expected.charAt(7), joinedReader.read()); |
| CharStreams.skipFully(joinedReader, 1); |
| assertEquals(expected.charAt(9), joinedReader.read()); |
| assertEquals(-1, joinedReader.read()); |
| } |
| |
| public void testSkipZero() throws Exception { |
| CharSource source = newCharSource("a"); |
| Iterable<CharSource> list = ImmutableList.of(source, source); |
| Reader joinedReader = CharSource.concat(list).openStream(); |
| |
| assertEquals(0, joinedReader.skip(0)); |
| assertEquals('a', joinedReader.read()); |
| } |
| } |