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// copied from https://github.com/killme2008/xmemcached/tree/90dd456f29/src/main/java/net/rubyeye/xmemcached/transcoders
// Copyright (c) 2006  Dustin Sallings 

package org.eclipse.jetty.redis.session.transcoders;

import java.nio.ByteBuffer;
import java.util.Arrays;

/**
 * Cached data with its attributes.
 */
public final class CachedData {

    /**
     * Maximum data size allowed by memcached.
     */
    public final static int MAX_SIZE = 1024 * 1024;

    protected int flag;
    protected long cas;
    private int capacity = -1;

    protected int size = 0;

    // cache decoded object.
    public volatile Object decodedObject;

    // padding fields
    public long p1, p2, p3, p4;
    public int p5;

    protected byte[] data;

    public final int getSize() {
        return this.size;
    }

    public final void fillData(ByteBuffer buffer, int offset, int length) {
        buffer.get(this.data, offset, length);
        this.size += length;
    }

    public final void fillData(ByteBuffer buffer, int length) {
        buffer.get(this.data, this.size, length);
        this.size += length;
    }

    public final int getCapacity() {
        return this.capacity;
    }

    public final void setSize(int size) {
        this.size = size;
    }

    public final void setCapacity(int dataLen) {
        this.capacity = dataLen;
    }

    public static final int getMAX_SIZE() {
        return MAX_SIZE;
    }

    public final void setFlag(int flags) {
        this.flag = flags;
    }

    public final void setData(byte[] data) {
        if (data.length > this.capacity) {
            throw new IllegalArgumentException(
                    "Cannot cache data larger than 1MB (you tried to cache a "
                            + data.length + " byte object)");
        }
        this.data = data;
    }

    public final void setCas(long cas) {
        this.cas = cas;
    }

    public long getCas() {
        return this.cas;
    }

    public CachedData() {
        super();
    }

    /**
     * Get a CachedData instance for the given flags and byte array.
     *
     * @param f        the flags
     * @param d        the data
     * @param capacity the maximum allowable size.
     */
    public CachedData(int f, byte[] d, int capacity, long casId) {
        super();
        this.capacity = capacity;
        this.size = d != null ? d.length : 0;
        if (d != null && d.length > capacity) {
            throw new IllegalArgumentException(
                    "Cannot cache data larger than 1MB (you tried to cache a "
                            + d.length + " byte object)");
        }
        this.flag = f;
        this.data = d;
        this.cas = casId;
    }

    /**
     * Get a CachedData instance for the given flags and byte array.
     *
     * @param f the flags
     * @param d the data
     */
    public CachedData(int f, byte[] d) {
        this(f, d, MAX_SIZE, -1);
    }

    /**
     * Get the stored data.
     */
    public final byte[] getData() {
        return this.data;
    }

    /**
     * Get the flags stored along with this value.
     */
    public final int getFlag() {
        return this.flag;
    }

    @Override
    public String toString() {
        return "{CachedData flags=" + this.flag + " data="
                + Arrays.toString(this.data) + "}";
    }

    public int remainingCapacity() {
        if (getCapacity() < 0) {
            return -1;
        }
        int remainingCapacity = getCapacity() - getSize();
        return remainingCapacity;
    }
}