001: /*BEGIN_COPYRIGHT_BLOCK
002: *
003: * Copyright (c) 2001-2007, JavaPLT group at Rice University (javaplt@rice.edu)
004: * All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions are met:
008: * * Redistributions of source code must retain the above copyright
009: * notice, this list of conditions and the following disclaimer.
010: * * Redistributions in binary form must reproduce the above copyright
011: * notice, this list of conditions and the following disclaimer in the
012: * documentation and/or other materials provided with the distribution.
013: * * Neither the names of DrJava, the JavaPLT group, Rice University, nor the
014: * names of its contributors may be used to endorse or promote products
015: * derived from this software without specific prior written permission.
016: *
017: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
018: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
019: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
020: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
021: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
022: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
023: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
024: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
025: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
026: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
027: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
028: *
029: * This software is Open Source Initiative approved Open Source Software.
030: * Open Source Initative Approved is a trademark of the Open Source Initiative.
031: *
032: * This file is part of DrJava. Download the current version of this project
033: * from http://www.drjava.org/ or http://sourceforge.net/projects/drjava/
034: *
035: * END_COPYRIGHT_BLOCK*/
036:
037: /*BEGIN_COPYRIGHT_BLOCK
038: *
039: * Copyright (c) 2001-2007, JavaPLT group at Rice University (javaplt@rice.edu)
040: * All rights reserved.
041: *
042: * Redistribution and use in source and binary forms, with or without
043: * modification, are permitted provided that the following conditions are met:
044: * * Redistributions of source code must retain the above copyright
045: * notice, this list of conditions and the following disclaimer.
046: * * Redistributions in binary form must reproduce the above copyright
047: * notice, this list of conditions and the following disclaimer in the
048: * documentation and/or other materials provided with the distribution.
049: * * Neither the names of DrJava, the JavaPLT group, Rice University, nor the
050: * names of its contributors may be used to endorse or promote products
051: * derived from this software without specific prior written permission.
052: *
053: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
054: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
055: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
056: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
057: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
058: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
059: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
060: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
061: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
062: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
063: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
064: *
065: * This software is Open Source Initiative approved Open Source Software.
066: * Open Source Initative Approved is a trademark of the Open Source Initiative.
067: *
068: * This file is part of DrJava. Download the current version of this project
069: * from http://www.drjava.org/ or http://sourceforge.net/projects/drjava/
070: *
071: * END_COPYRIGHT_BLOCK*/
072:
073: package edu.rice.cs.util;
074:
075: import edu.rice.cs.drjava.DrJavaTestCase;
076:
077: import java.io.BufferedReader;
078: import java.io.IOException;
079: import java.io.InputStreamReader;
080:
081: /**
082: * Test suite over InputStreamRedirector.
083: */
084: public class StreamRedirectorTest extends DrJavaTestCase {
085: /**
086: * Tests that an InputStreamRedirector correctly rejects empty input.
087: */
088: public void testEmptyInput() throws IOException {
089: InputStreamRedirector isr = new InputStreamRedirector() {
090: protected String _getInput() {
091: return "";
092: }
093: };
094: try {
095: isr.read();
096: fail("Should have thrown IOException on empty input!");
097: } catch (IOException ioe) {
098: // correct behavior
099: }
100: }
101:
102: /**
103: * Tests that an InputStreamRedirector correctly redirects input that is static.
104: */
105: public void testStaticInput() throws IOException {
106: InputStreamRedirector isr = new InputStreamRedirector() {
107: protected String _getInput() {
108: return "Hello World!\n";
109: }
110: };
111: BufferedReader br = new BufferedReader(new InputStreamReader(
112: isr));
113: assertEquals("First read", "Hello World!", br.readLine());
114: assertEquals("Second read", "Hello World!", br.readLine()); //behavior should be consistent
115: }
116:
117: /**
118: * Tests that an InputStreamRedirector correctly redirects input that changes.
119: */
120: public void testDynamicInput() throws IOException {
121: InputStreamRedirector isr = new InputStreamRedirector() {
122: int x = -1;
123:
124: protected String _getInput() {
125: x++;
126: return x + "\n";
127: }
128: };
129: BufferedReader br = new BufferedReader(new InputStreamReader(
130: isr));
131: assertEquals("First read", "0", br.readLine());
132: // x should get incremented on each call
133: assertEquals("Second read", "1", br.readLine());
134: assertEquals("Third read", "2", br.readLine());
135: }
136:
137: /**
138: * Tests that an InputStreamRedirector correctly calls _getInput() only
139: * when it is needed.
140: */
141: public void testMultiLineInput() throws IOException {
142: InputStreamRedirector isr = new InputStreamRedirector() {
143: private boolean alreadyCalled = false;
144:
145: protected String _getInput() {
146: if (alreadyCalled) {
147: throw new RuntimeException(
148: "_getInput() has already been called!");
149: }
150: alreadyCalled = true;
151: return "Line 1\nLine 2\n";
152: }
153: };
154: BufferedReader br = new BufferedReader(new InputStreamReader(
155: isr));
156: assertEquals("First read calls _getInput()", "Line 1", br
157: .readLine());
158: assertEquals("First read does not call _getInput()", "Line 2",
159: br.readLine());
160: try {
161: br.readLine();
162: fail("_getInput() should be called again!");
163: } catch (RuntimeException re) {
164: assertEquals("Should have thrown correct exception.",
165: "_getInput() has already been called!", re
166: .getMessage());
167: }
168: }
169: }
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