/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.
 */
package io.netty.handler.codec.http.websocketx;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.DefaultByteBufHolder;
import io.netty.util.internal.StringUtil;

/**
 * Base class for web socket frames
 */
public abstract class WebSocketFrame extends DefaultByteBufHolder {

    /**
     * Flag to indicate if this frame is the final fragment in a message. The first fragment (frame) may also be the
     * final fragment.
     */
    private final boolean finalFragment;

    /**
     * RSV1, RSV2, RSV3 used for extensions
     */
    private final int rsv;

    protected WebSocketFrame(ByteBuf binaryData) {
        this(true, 0, binaryData);
    }

    protected WebSocketFrame(boolean finalFragment, int rsv, ByteBuf binaryData) {
        super(binaryData);
        this.finalFragment = finalFragment;
        this.rsv = rsv;
    }

    /**
     * Flag to indicate if this frame is the final fragment in a message. The first fragment (frame) may also be the
     * final fragment.
     */
    public boolean isFinalFragment() {
        return finalFragment;
    }

    /**
     * Bits used for extensions to the standard.
     */
    public int rsv() {
        return rsv;
    }

    @Override
    public abstract WebSocketFrame copy();

    @Override
    public abstract WebSocketFrame duplicate();

    @Override
    public String toString() {
        return StringUtil.simpleClassName(this) + "(data: " + contentToString() + ')';
    }

    @Override
    public WebSocketFrame retain() {
        super.retain();
        return this;
    }

    @Override
    public WebSocketFrame retain(int increment) {
        super.retain(increment);
        return this;
    }
}
