com.igormaznitsa.meta.common.utils.IOUtils Maven / Gradle / Ivy

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Set of utilities and auxiliary classes to make development easier.
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/*
 * Copyright 2015 Igor Maznitsa.
 *
 * 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.igormaznitsa.meta.common.utils;

import com.igormaznitsa.meta.annotation.Weight;
import com.igormaznitsa.meta.common.exceptions.MetaErrorListeners;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.ThreadSafe;

/**
 * Auxiliary methods for IO operations.
 *
 * @since 1.0
 */
@ThreadSafe
public final class IOUtils {

  private IOUtils() {
  }

  /**
   * Pack some binary data.
   *
   * @param data data to be packed
   * @return packed data as byte array
   * @since 1.0
   */
  @Nonnull
  @Weight(Weight.Unit.VARIABLE)
  public static byte[] packData(@Nonnull final byte[] data) {
    final Deflater compressor = new Deflater(Deflater.BEST_COMPRESSION);
    compressor.setInput(Assertions.assertNotNull(data));
    compressor.finish();
    final ByteArrayOutputStream resultData = new ByteArrayOutputStream(data.length + 100);

    final byte[] buffer = new byte[1024];
    while (!compressor.finished()) {
      resultData.write(buffer, 0, compressor.deflate(buffer));
    }

    return resultData.toByteArray();
  }

  /**
   * Unpack binary data packed by the packData method.
   *
   * @param data packed data array
   * @return unpacked byte array
   * @throws IllegalArgumentException it will be thrown if the data has wrong format, global error listeners will be also notified
   * @see #packData(byte[])
   * @since 1.0
   */
  @Nonnull
  @Weight(Weight.Unit.VARIABLE)
  public static byte[] unpackData(@Nonnull final byte[] data) {
    final Inflater decompressor = new Inflater();
    decompressor.setInput(Assertions.assertNotNull(data));
    final ByteArrayOutputStream outStream = new ByteArrayOutputStream(data.length * 2);
    final byte[] buffer = new byte[1024];
    try {
      while (!decompressor.finished()) {
        outStream.write(buffer, 0, decompressor.inflate(buffer));
      }
      return outStream.toByteArray();
    } catch (DataFormatException ex) {
      MetaErrorListeners.fireError("Can't unpack data for wrong format", ex);
      throw new IllegalArgumentException("Wrong formatted data", ex);
    }
  }

  /**
   * Closing quietly any closeable object. Any exception will be caught (but global error listeners will be notified)
   *
   * @param closeable object to be closed quietly
   * @return the same object provided in args
   * @since 1.0
   */
  @Weight(Weight.Unit.LIGHT)
  @Nullable
  public static Closeable closeQuietly(@Nullable final Closeable closeable) {
    if (closeable != null) {
      try {
        closeable.close();
      } catch (Exception ex) {
        MetaErrorListeners.fireError("Exception in closeQuietly", ex);
      }
    }
    return closeable;
  }
}