/*
 * 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.directmemory.lightning.maven;

import java.io.File;
import java.io.FileFilter;
import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

public final class SupportUtil
{

    private SupportUtil()
    {
    }

    public static List<File> recursiveGetAllJavaSources( File file, ArrayList<File> list, FileFilter fileFilter )
    {
        if ( file.isDirectory() )
        {
            for ( File f : file.listFiles( fileFilter ) )
            {
                recursiveGetAllJavaSources( f, list, fileFilter );
            }
        }
        else
        {
            list.add( file );
        }
        return list;
    }

    public static String readAllText( File file, Charset charset )
    {
        try
        {
            StringBuilder sb = new StringBuilder();
            LineNumberReader reader = new LineNumberReader( new FileReader( file ) );
            String line = null;
            while ( ( line = reader.readLine() ) != null )
            {
                sb.append( line );
            }
            return sb.toString();
        }
        catch ( IOException e )
        {
            return null;
        }
    }
}