001 /* 002 * Created on Jan 26, 2011 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with 005 * the License. You may obtain a copy of the License at 006 * 007 * http://www.apache.org/licenses/LICENSE-2.0 008 * 009 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on 010 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the 011 * specific language governing permissions and limitations under the License. 012 * 013 * Copyright @2011 the original author or authors. 014 */ 015 package org.fest.assertions.internal; 016 017 import static java.lang.String.format; 018 019 import static org.fest.assertions.error.ShouldHaveEqualContent.shouldHaveEqualContent; 020 021 import java.io.IOException; 022 import java.io.InputStream; 023 import java.util.List; 024 025 import org.fest.assertions.core.AssertionInfo; 026 import org.fest.util.VisibleForTesting; 027 028 /** 029 * Reusable assertions for <code>{@link InputStream}</code>s. 030 * 031 * @author Matthieu Baechler 032 */ 033 public class InputStreams { 034 035 private static final InputStreams INSTANCE = new InputStreams(); 036 037 /** 038 * Returns the singleton instance of this class. 039 * @return the singleton instance of this class. 040 */ 041 public static InputStreams instance() { 042 return INSTANCE; 043 } 044 045 @VisibleForTesting 046 Diff diff = new Diff(); 047 @VisibleForTesting 048 Failures failures = Failures.instance(); 049 050 @VisibleForTesting 051 InputStreams() {} 052 053 /** 054 * Asserts that the given InputStreams have equal content. 055 * 056 * @param info contains information about the assertion. 057 * @param actual the "actual" InputStream. 058 * @param expected the "expected" InputStream. 059 * @throws NullPointerException if {@code expected} is {@code null}. 060 * @throws AssertionError if {@code actual} is {@code null}. 061 * @throws AssertionError if the given InputStreams do not have equal content. 062 * @throws InputStreamsException if an I/O error occurs. 063 */ 064 public void assertEqualContent(AssertionInfo info, InputStream actual, InputStream expected) { 065 if (expected == null) throw new NullPointerException("The InputStream to compare to should not be null"); 066 assertNotNull(info, actual); 067 try { 068 List<String> diffs = diff.diff(actual, expected); 069 if (diffs.isEmpty()) return; 070 throw failures.failure(info, shouldHaveEqualContent(actual, expected, diffs)); 071 } catch (IOException e) { 072 String msg = format("Unable to compare contents of InputStreams :<%s> and:<%s>", actual, expected); 073 throw new InputStreamsException(msg, e); 074 } 075 } 076 077 private static void assertNotNull(AssertionInfo info, InputStream stream) { 078 Objects.instance().assertNotNull(info, stream); 079 } 080 }