fileutilslistfilestestcase.java

java 的io 操作类 java 的io 操作类

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.util.Collection;
import java.util.Iterator;

import org.apache.commons.io.filefilter.FileFilterUtils;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.testtools.FileBasedTestCase;

/**
 * Test cases for FileUtils.listFiles() methods.
 */
public class FileUtilsListFilesTestCase extends FileBasedTestCase {

    public FileUtilsListFilesTestCase(String name) {
        super(name);
    }
    
    private File getLocalTestDirectory() {
        return new File(getTestDirectory(), "list-files");
    }
    
    /**
     * @see junit.framework.TestCase#setUp()
     */
    protected void setUp() throws Exception {
        File dir = getLocalTestDirectory();
        if (dir.exists()) {
            FileUtils.deleteDirectory(dir);
        }
        dir.mkdirs();
        File file = new File(dir, "dummy-build.xml");
        FileUtils.touch(file);
        file = new File(dir, "README");
        FileUtils.touch(file);
        
        dir = new File(dir, "subdir1");
        dir.mkdirs();
        file = new File(dir, "dummy-build.xml");
        FileUtils.touch(file);
        file = new File(dir, "dummy-readme.txt");
        FileUtils.touch(file);
        
        dir = new File(dir, "subsubdir1");
        dir.mkdirs();
        file = new File(dir, "dummy-file.txt");
        FileUtils.touch(file);
        file = new File(dir, "dummy-index.html");
        FileUtils.touch(file);
        
        dir = dir.getParentFile();
        dir = new File(dir, "CVS");
        dir.mkdirs();
        file = new File(dir, "Entries");
        FileUtils.touch(file);
        file = new File(dir, "Repository");
        FileUtils.touch(file);
    }

    /**
     * @see junit.framework.TestCase#tearDown()
     */
    protected void tearDown() throws Exception {
        File dir = getLocalTestDirectory();
        FileUtils.deleteDirectory(dir);
    }
    
    private Collection filesToFilenames(Collection files) {
        Collection filenames = new java.util.ArrayList(files.size());
        Iterator i = files.iterator();
        while (i.hasNext()) {
            filenames.add(((File)i.next()).getName());
        }
        return filenames;
    }
    
    public void testListFilesByExtension() throws Exception {
        String[] extensions = {"xml", "txt"};
        
        Collection files = FileUtils.listFiles(getLocalTestDirectory(), extensions, false);
        assertEquals(1, files.size());
        Collection filenames = filesToFilenames(files);
        assertTrue(filenames.contains("dummy-build.xml"));
        assertFalse(filenames.contains("README"));
        assertFalse(filenames.contains("dummy-file.txt"));
        
        files = FileUtils.listFiles(getLocalTestDirectory(), extensions, true);
        filenames = filesToFilenames(files);
        assertEquals(4, filenames.size());
        assertTrue(filenames.contains("dummy-file.txt"));
        assertFalse(filenames.contains("dummy-index.html"));
        
        files = FileUtils.listFiles(getLocalTestDirectory(), null, false);
        assertEquals(2, files.size());
        filenames = filesToFilenames(files);
        assertTrue(filenames.contains("dummy-build.xml"));
        assertTrue(filenames.contains("README"));
        assertFalse(filenames.contains("dummy-file.txt"));
        
    }

    public void testListFiles() throws Exception {
        Collection files;
        Collection filenames;
        IOFileFilter fileFilter;
        IOFileFilter dirFilter;
        
        //First, find non-recursively
        fileFilter = FileFilterUtils.trueFileFilter();
        files = FileUtils.listFiles(getLocalTestDirectory(), fileFilter, null);
        filenames = filesToFilenames(files);
        assertTrue("'dummy-build.xml' is missing", filenames.contains("dummy-build.xml"));
        assertFalse("'dummy-index.html' shouldn't be found", filenames.contains("dummy-index.html"));
        assertFalse("'Entries' shouldn't be found", filenames.contains("Entries"));
        
        //Second, find recursively
        fileFilter = FileFilterUtils.trueFileFilter();
        dirFilter = FileFilterUtils.notFileFilter(FileFilterUtils.nameFileFilter("CVS"));
        files = FileUtils.listFiles(getLocalTestDirectory(), fileFilter, dirFilter);
        filenames = filesToFilenames(files);
        assertTrue("'dummy-build.xml' is missing", filenames.contains("dummy-build.xml"));
        assertTrue("'dummy-index.html' is missing", filenames.contains("dummy-index.html"));
        assertFalse("'Entries' shouldn't be found", filenames.contains("Entries"));
        
        //Do the same as above but now with the filter coming from FileFilterUtils
        fileFilter = FileFilterUtils.trueFileFilter();
        dirFilter = FileFilterUtils.makeCVSAware(null);
        files = FileUtils.listFiles(getLocalTestDirectory(), fileFilter, dirFilter);
        filenames = filesToFilenames(files);
        assertTrue("'dummy-build.xml' is missing", filenames.contains("dummy-build.xml"));
        assertTrue("'dummy-index.html' is missing", filenames.contains("dummy-index.html"));
        assertFalse("'Entries' shouldn't be found", filenames.contains("Entries"));

        //Again with the CVS filter but now with a non-null parameter
        fileFilter = FileFilterUtils.trueFileFilter();
        dirFilter = FileFilterUtils.prefixFileFilter("sub");
        dirFilter = FileFilterUtils.makeCVSAware(dirFilter);
        files = FileUtils.listFiles(getLocalTestDirectory(), fileFilter, dirFilter);
        filenames = filesToFilenames(files);
        assertTrue("'dummy-build.xml' is missing", filenames.contains("dummy-build.xml"));
        assertTrue("'dummy-index.html' is missing", filenames.contains("dummy-index.html"));
        assertFalse("'Entries' shouldn't be found", filenames.contains("Entries"));

        try {
            FileUtils.listFiles(getLocalTestDirectory(), null, null);
            fail("Expected error about null parameter");
        } catch (Exception e) {
            //fine
        }
    }


}