TempFiles.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 *      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.guvnor.test;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;

import org.apache.commons.io.FileUtils;

public class TempFiles {

    private ArrayList<File> files = new ArrayList<File>();

    public File createTempFile( final String fullName ) throws IOException {
        Iterator<String> iterator = Arrays.asList( fullName.split( "/" ) ).iterator();

        File previousFolder = null;
        while ( iterator.hasNext() ) {

            String next = iterator.next();
            if ( iterator.hasNext() ) {
                previousFolder = createFolder( previousFolder,
                                               next );
            } else {
                return createFile( previousFolder,
                                   next );
            }
        }

        return null;
    }

    private File createFolder( final File previousFolder,
                               final String next ) throws IOException {
        if ( previousFolder == null ) {
            return createTempDirectory( next );
        } else {
            return createTempDirectory( next,
                                        previousFolder );
        }
    }

    private File createFile( final File previousFolder,
                             final String next ) throws IOException {

        String suffix = getSuffix( next );
        String prefix = getPrefix( next );

        if ( previousFolder == null ) {
            File tempFile = File.createTempFile( prefix, suffix );
            files.add( tempFile );
            return tempFile;
        } else {
            File tempFile = File.createTempFile( prefix, suffix, previousFolder );
            files.add( tempFile );
            return tempFile;
        }
    }

    public File createTempDirectory( final String name ) throws IOException {
        final File temp = File.createTempFile( name, Long.toString( System.nanoTime() ) );

        if ( !(temp.delete()) ) {
            throw new IOException( "Could not delete temp file: " + temp.getAbsolutePath() );
        }

        if ( !(temp.mkdir()) ) {
            throw new IOException( "Could not create temp directory: " + temp.getAbsolutePath() );
        }

        files.add( temp );

        return temp;
    }

    private File createTempDirectory( final String name,
                                      final File file ) throws IOException {
        final File temp = File.createTempFile( name, Long.toString( System.nanoTime() ), file );

        if ( !(temp.delete()) ) {
            throw new IOException( "Could not delete temp file: " + temp.getAbsolutePath() );
        }

        if ( !(temp.mkdir()) ) {
            throw new IOException( "Could not create temp directory: " + temp.getAbsolutePath() );
        }

        files.add( temp );

        return temp;
    }

    private String getSuffix( final String next ) {
        final int index = next.lastIndexOf( '.' );
        if ( index >= 0 ) {
            return next.substring( 0, index );
        } else {
            return next;
        }
    }

    private String getPrefix( final String next ) {
        final int index = next.lastIndexOf( '.' );
        if ( index >= 0 ) {
            return next.substring( index );
        } else {
            return next;
        }
    }

    public void deleteFiles() {
        for ( final File tempFile : files ) {
            FileUtils.deleteQuietly( tempFile );
        }
    }
}