com.sangupta.jerry.unsafe.UnsafeMemoryUtils.java Source code

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Here is the source code for com.sangupta.jerry.unsafe.UnsafeMemoryUtils.java

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/**
 *
 * jerry - Common Java Functionality
 * Copyright (c) 2012-2015, Sandeep Gupta
 * 
 * http://sangupta.com/projects/jerry
 * 
 * Licensed 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 com.sangupta.jerry.unsafe;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.commons.io.IOUtils;

/**
 * Utility class that provides convenience methods for working
 * with {@link UnsafeMemory}.
 * 
 * @author sangupta
 *
 */
public class UnsafeMemoryUtils {

    public static void writeToFile(UnsafeMemory memory, File file) throws IOException {
        FileOutputStream stream = null;
        BufferedOutputStream boss = null;
        try {
            final byte[] bytes = memory.getBuffer();
            final int length = memory.getPosition();

            stream = new FileOutputStream(file);
            boss = new BufferedOutputStream(stream);

            int CHUNK_SIZE = 1 << 20;
            int chunks = length / CHUNK_SIZE;
            int extra = length % CHUNK_SIZE;
            if (extra > 0) {
                chunks++;
            }

            for (int ki = 0; ki < chunks; ki++) {
                int delta = CHUNK_SIZE;
                if ((ki + 1) == chunks) {
                    delta = extra;
                }
                boss.write(bytes, ki * CHUNK_SIZE, delta);
            }
        } catch (IOException e) {
            throw new IOException("Unable to write bytes to disk", e);
        } finally {
            IOUtils.closeQuietly(boss);
            IOUtils.closeQuietly(stream);
        }
    }
}