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The source code

/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * 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 org.apache.commons.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;

import org.apache.commons.io.testtools.*;

// Note: jdk1.2 dependency

/**
 * This is used to test IOUtils for correctness. The following checks are performed:
 * 
    *
  • The return must not be null, must be the same type and equals() to the method's second arg
  • *
  • All bytes must have been read from the source (available() == 0)
  • *
  • The source and destination content must be identical (byte-wise comparison check)
  • *
  • The output stream must not have been closed (a byte/char is written to test this, and * subsequent size checked)
  • *
* Due to interdependencies in IOUtils and IOUtilsTestlet, one bug may cause * multiple tests to fail. * * @author Jeff Turner */ public class IOUtilsTestCase extends FileBasedTestCase { /* * Note: this is not particularly beautiful code. A better way to check for * flush and close status would be to implement "trojan horse" wrapper * implementations of the various stream classes, which set a flag when * relevant methods are called. (JT) */ private static final int FILE_SIZE = 1024 * 4 + 1; private File m_testFile; public void setUp() { try { getTestDirectory().mkdirs(); m_testFile = new File( getTestDirectory(), "file2-test.txt" ); createFile( m_testFile, FILE_SIZE ); } catch( IOException ioe ) { throw new RuntimeException( "Can't run this test because " + "environment could not be built: " + ioe.getMessage()); } } public void tearDown() { try { FileUtils.deleteDirectory( getTestDirectory() ); } catch( IOException ioe ) { // Ignore, because by this time, it is too late. } } public IOUtilsTestCase( String name ) { super( name ); } /** Assert that the contents of two byte arrays are the same. */ private void assertEqualContent( byte[] b0, byte[] b1 ) throws IOException { assertTrue( "Content not equal according to java.util.Arrays#equals()", Arrays.equals( b0, b1 ) ); } public void testInputStreamToString() throws Exception { FileInputStream fin = new FileInputStream( m_testFile ); try { String out = IOUtils.toString( fin ); assertNotNull( out ); assertTrue( "Not all bytes were read", fin.available() == 0 ); assertTrue( "Wrong output size: out.length()=" + out.length() + "!=" + FILE_SIZE, out.length() == FILE_SIZE ); } finally { fin.close(); } } public void testReaderToString() throws Exception { FileReader fin = new FileReader( m_testFile ); try { String out = IOUtils.toString( fin ); assertNotNull( out ); assertTrue( "Wrong output size: out.length()=" + out.length() + "!=" + FILE_SIZE, out.length() == FILE_SIZE ); } finally { fin.close(); } } public void testStringToOutputStream() throws Exception { File destination = newFile( "copy5.txt" ); FileReader fin = new FileReader( m_testFile ); String str; try { // Create our String. Rely on testReaderToString() to make sure this is valid. str = IOUtils.toString( fin ); } finally { fin.close(); } FileOutputStream fout = new FileOutputStream( destination ); try { CopyUtils.copy( str, fout ); //Note: this method *does* flush. It is equivalent to: // OutputStreamWriter _out = new OutputStreamWriter(fout); // CopyUtils.copy( str, _out, 4096 ); // copy( Reader, Writer, int ); // _out.flush(); // out = fout; // note: we don't flush here; this IOUtils method does it for us checkFile( destination, m_testFile ); checkWrite( fout ); } finally { fout.close(); } deleteFile( destination ); } public void testStringToWriter() throws Exception { File destination = newFile( "copy6.txt" ); FileReader fin = new FileReader( m_testFile ); String str; try { // Create our String. Rely on testReaderToString() to make sure this is valid. str = IOUtils.toString( fin ); } finally { fin.close(); } FileWriter fout = new FileWriter( destination ); try { CopyUtils.copy( str, fout ); fout.flush(); checkFile( destination, m_testFile ); checkWrite( fout ); } finally { fout.close(); } deleteFile( destination ); } public void testInputStreamToByteArray() throws Exception { FileInputStream fin = new FileInputStream( m_testFile ); try { byte[] out = IOUtils.toByteArray( fin ); assertNotNull( out ); assertTrue( "Not all bytes were read", fin.available() == 0 ); assertTrue( "Wrong output size: out.length=" + out.length + "!=" + FILE_SIZE, out.length == FILE_SIZE ); assertEqualContent( out, m_testFile ); } finally { fin.close(); } } public void testStringToByteArray() throws Exception { FileReader fin = new FileReader( m_testFile ); try { // Create our String. Rely on testReaderToString() to make sure this is valid. String str = IOUtils.toString( fin ); byte[] out = IOUtils.toByteArray( str ); assertEqualContent( str.getBytes(), out ); } finally { fin.close(); } } public void testByteArrayToWriter() throws Exception { File destination = newFile( "copy7.txt" ); FileInputStream fin = new FileInputStream( m_testFile ); byte[] in; try { // Create our byte[]. Rely on testInputStreamToByteArray() to make sure this is valid. in = IOUtils.toByteArray( fin ); } finally { fin.close(); } FileWriter fout = new FileWriter( destination ); try { CopyUtils.copy( in, fout ); fout.flush(); checkFile( destination, m_testFile ); checkWrite( fout ); } finally { fout.close(); } deleteFile( destination ); } public void testByteArrayToString() throws Exception { FileInputStream fin = new FileInputStream( m_testFile ); try { byte[] in = IOUtils.toByteArray( fin ); // Create our byte[]. Rely on testInputStreamToByteArray() to make sure this is valid. String str = IOUtils.toString( in ); assertEqualContent( in, str.getBytes() ); } finally { fin.close(); } } public void testByteArrayToOutputStream() throws Exception { File destination = newFile( "copy8.txt" ); FileInputStream fin = new FileInputStream( m_testFile ); byte[] in; try { // Create our byte[]. Rely on testInputStreamToByteArray() to make sure this is valid. in = IOUtils.toByteArray( fin ); } finally { fin.close(); } FileOutputStream fout = new FileOutputStream( destination ); try { CopyUtils.copy( in, fout ); fout.flush(); checkFile( destination, m_testFile ); checkWrite( fout ); } finally { fout.close(); } deleteFile( destination ); } }
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