io.netty.handler.codec.http.websocketx.CloseWebSocketFrame Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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.Unpooled;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.EmptyArrays;

/**
 * Web Socket Frame for closing the connection
 */
public class CloseWebSocketFrame extends WebSocketFrame {

    /**
     * Creates a new empty close frame.
     */
    public CloseWebSocketFrame() {
        super(Unpooled.buffer(0));
    }

    /**
     * Creates a new empty close frame with closing getStatus code and reason text
     *
     * @param statusCode
     *            Integer status code as per RFC 6455. For
     *            example, 1000 indicates normal closure.
     * @param reasonText
     *            Reason text. Set to null if no text.
     */
    public CloseWebSocketFrame(int statusCode, String reasonText) {
        this(true, 0, statusCode, reasonText);
    }

    /**
     * Creates a new close frame with no losing getStatus code and no reason text
     *
     * @param finalFragment
     *            flag indicating if this frame is the final fragment
     * @param rsv
     *            reserved bits used for protocol extensions
     */
    public CloseWebSocketFrame(boolean finalFragment, int rsv) {
        this(finalFragment, rsv, Unpooled.buffer(0));
    }

    /**
     * Creates a new close frame with closing status code and reason text
     *
     * @param finalFragment
     *            flag indicating if this frame is the final fragment
     * @param rsv
     *            reserved bits used for protocol extensions
     * @param statusCode
     *            Integer status code as per RFC 6455. For
     *            example, 1000 indicates normal closure.
     * @param reasonText
     *            Reason text. Set to null if no text.
     */
    public CloseWebSocketFrame(boolean finalFragment, int rsv, int statusCode, String reasonText) {
        super(finalFragment, rsv, newBinaryData(statusCode, reasonText));
    }

    private static ByteBuf newBinaryData(int statusCode, String reasonText) {
        byte[] reasonBytes = EmptyArrays.EMPTY_BYTES;
        if (reasonText != null) {
            reasonBytes = reasonText.getBytes(CharsetUtil.UTF_8);
        }

        ByteBuf binaryData = Unpooled.buffer(2 + reasonBytes.length);
        binaryData.writeShort(statusCode);
        if (reasonBytes.length > 0) {
            binaryData.writeBytes(reasonBytes);
        }

        binaryData.readerIndex(0);
        return binaryData;
    }

    /**
     * Creates a new close frame
     *
     * @param finalFragment
     *            flag indicating if this frame is the final fragment
     * @param rsv
     *            reserved bits used for protocol extensions
     * @param binaryData
     *            the content of the frame. Must be 2 byte integer followed by optional UTF-8 encoded string.
     */
    public CloseWebSocketFrame(boolean finalFragment, int rsv, ByteBuf binaryData) {
        super(finalFragment, rsv, binaryData);
    }

    /**
     * Returns the closing status code as per RFC 6455. If
     * a getStatus code is set, -1 is returned.
     */
    public int statusCode() {
        ByteBuf binaryData = content();
        if (binaryData == null || binaryData.capacity() == 0) {
            return -1;
        }

        binaryData.readerIndex(0);
        int statusCode = binaryData.readShort();
        binaryData.readerIndex(0);

        return statusCode;
    }

    /**
     * Returns the reason text as per RFC 6455 If a reason
     * text is not supplied, an empty string is returned.
     */
    public String reasonText() {
        ByteBuf binaryData = content();
        if (binaryData == null || binaryData.capacity() <= 2) {
            return "";
        }

        binaryData.readerIndex(2);
        String reasonText = binaryData.toString(CharsetUtil.UTF_8);
        binaryData.readerIndex(0);

        return reasonText;
    }

    @Override
    public CloseWebSocketFrame copy() {
        return new CloseWebSocketFrame(isFinalFragment(), rsv(), content().copy());
    }

    @Override
    public CloseWebSocketFrame duplicate() {
        return new CloseWebSocketFrame(isFinalFragment(), rsv(), content().duplicate());
    }

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

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