kalumet-modules/utils/src/main/java/org/apache/kalumet/utils/FileUtils.java

/*
 * 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.kalumet.utils;

import org.apache.commons.io.IOUtils;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileType;
import org.apache.kalumet.FileManipulator;
import org.apache.kalumet.ws.client.SimplifiedFileObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStream;
import java.util.Date;

/**
 * Utils to manipulate file (view, browse)
 */
public class FileUtils
{

    private final static transient Logger LOGGER = LoggerFactory.getLogger( FileUtils.class );

    /**
     * Wrapper method to read a file.
     *
     * @param path the file VFS path.
     * @return the file content.
     */
    public static String view( String path )
    {
        String content = null;
        InputStream stream = null;
        FileManipulator fileManipulator = null;
        try
        {
            // get a file manipulator instance
            fileManipulator = new FileManipulator();
            // get the file content
            stream = fileManipulator.read( path );
            // populate the content string
            content = IOUtils.toString( stream );
        }
        catch ( Exception e )
        {
            LOGGER.warn( "Can't view {}", path, e );
        }
        finally
        {
            if ( stream != null )
            {
                try
                {
                    stream.close();
                }
                catch ( Exception e )
                {
                    // nothing to do
                }
            }
            if ( fileManipulator != null )
            {
                fileManipulator.close();
            }
        }
        return content;
    }

    /**
     * Wrapper method to browse a path.
     *
     * @param path the path to browse.
     * @return the list of children.
     */
    public static SimplifiedFileObject[] browse( String path )
    {
        SimplifiedFileObject[] children = null;
        FileManipulator fileManipulator = null;
        try
        {
            // get a file manipulator instance
            fileManipulator = new FileManipulator();
            // get the path children
            FileObject[] fileObjects = fileManipulator.browse( path );
            children = new SimplifiedFileObject[fileObjects.length];
            for ( int i = 0; i < fileObjects.length; i++ )
            {
                SimplifiedFileObject file = new SimplifiedFileObject();
                file.setName( fileObjects[i].getName().getBaseName() );
                file.setPath( fileObjects[i].getName().getPath() );
                file.setFile( fileObjects[i].getType().equals( FileType.FILE ) );
                file.setLastModificationDate( new Date( fileObjects[i].getContent().getLastModifiedTime() ) );
                if ( fileObjects[i].getType().equals( FileType.FILE ) )
                {
                    file.setSize( fileObjects[i].getContent().getSize() );
                }
                else
                {
                    file.setSize( 0 );
                }
                children[i] = file;
            }
        }
        catch ( Exception e )
        {
            LOGGER.warn( "Can't browse {}", path, e );
        }
        finally
        {
            if ( fileManipulator != null )
            {
                fileManipulator.close();
            }
        }
        return children;
    }

}