Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.nio.channels.FileChannel;

/*
 * 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.    
 */

public class Main {

    public static void copyCompletely(URI input, URI output) throws IOException {
        try {
            InputStream in = null;
            try {
                File f = new File(input);
                if (f.exists())
                    in = new FileInputStream(f);
            } catch (Exception notAFile) {
            }

            File out = new File(output);
            File dir = out.getParentFile();
            dir.mkdirs();

            if (in == null)
                in = input.toURL().openStream();

            copyCompletely(in, new FileOutputStream(out));
        } catch (IllegalArgumentException e) {
            throw new IOException("Cannot copy to " + output);
        }
    }

    public static void copyCompletely(InputStream input, OutputStream output) throws IOException {
        // if both are file streams, use channel IO
        if ((output instanceof FileOutputStream) && (input instanceof FileInputStream)) {
            try {
                FileChannel target = ((FileOutputStream) output).getChannel();
                FileChannel source = ((FileInputStream) input).getChannel();

                source.transferTo(0, Integer.MAX_VALUE, target);

                source.close();
                target.close();

                return;
            } catch (Exception e) { /* failover to byte stream version */
            }
        }

        byte[] buf = new byte[8192];
        while (true) {
            int length = input.read(buf);
            if (length < 0)
                break;
            output.write(buf, 0, length);
        }

        try {
            input.close();
        } catch (IOException ignore) {
        }
        try {
            output.close();
        } catch (IOException ignore) {
        }
    }
}