// Generated by delombok at Sun Feb 26 12:31:38 KST 2017
package scouter.bytebuddy.utility;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * A utility for draining the contents of an {@link java.io.InputStream} into a {@code byte} array.
 */
public class StreamDrainer {
    /**
     * The default size of the buffer for draining a stream.
     */
    public static final int DEFAULT_BUFFER_SIZE = 1024;
    /**
     * A default instance using the {@link StreamDrainer#DEFAULT_BUFFER_SIZE}.
     */
    public static final StreamDrainer DEFAULT = new StreamDrainer();
    /**
     * A convenience constant referring to the value representing the end of a stream.
     */
    private static final int END_OF_STREAM = -1;
    /**
     * A convenience constant referring to the value representing the start of a stream.
     */
    private static final int FROM_BEGINNING = 0;
    /**
     * The buffer size for reading from a given stream.
     */
    private final int bufferSize;

    /**
     * Creates a stream drainer with the default buffer size.
     */
    public StreamDrainer() {
        this(DEFAULT_BUFFER_SIZE);
    }

    /**
     * Creates a stream drainer with the given buffer size.
     *
     * @param bufferSize The buffer size for reading from a given stream.
     */
    public StreamDrainer(int bufferSize) {
        this.bufferSize = bufferSize;
    }

    /**
     * Drains an input stream into a byte array. The given input stream is not closed.
     *
     * @param inputStream The input stream to drain.
     * @return A byte array containing the content of the input stream.
     * @throws IOException If the stream reading causes an error.
     */
    public byte[] drain(InputStream inputStream) throws IOException {
        List<byte[]> previousBytes = new ArrayList<byte[]>();
        byte[] currentArray = new byte[bufferSize];
        int currentIndex = 0;
        int currentRead;
        do {
            currentRead = inputStream.read(currentArray, currentIndex, bufferSize - currentIndex);
            currentIndex += currentRead > 0 ? currentRead : 0;
            if (currentIndex == bufferSize) {
                previousBytes.add(currentArray);
                currentArray = new byte[bufferSize];
                currentIndex = 0;
            }
        } while (currentRead != END_OF_STREAM);
        byte[] result = new byte[previousBytes.size() * bufferSize + currentIndex];
        int arrayIndex = 0;
        for (byte[] previousByte : previousBytes) {
            System.arraycopy(previousByte, FROM_BEGINNING, result, arrayIndex++ * bufferSize, bufferSize);
        }
        System.arraycopy(currentArray, FROM_BEGINNING, result, arrayIndex * bufferSize, currentIndex);
        return result;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @javax.annotation.Generated("lombok")
    public boolean equals(final java.lang.Object o) {
        if (o == this) return true;
        if (!(o instanceof StreamDrainer)) return false;
        final StreamDrainer other = (StreamDrainer) o;
        if (!other.canEqual((java.lang.Object) this)) return false;
        if (this.bufferSize != other.bufferSize) return false;
        return true;
    }

    @java.lang.SuppressWarnings("all")
    @javax.annotation.Generated("lombok")
    protected boolean canEqual(final java.lang.Object other) {
        return other instanceof StreamDrainer;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @javax.annotation.Generated("lombok")
    public int hashCode() {
        final int PRIME = 59;
        int result = 1;
        result = result * PRIME + this.bufferSize;
        return result;
    }
}