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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:
 *
 *   https://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.channel.socket;

import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelException;
import io.netty.channel.ChannelOption;
import io.netty.channel.DefaultChannelConfig;
import io.netty.channel.MessageSizeEstimator;
import io.netty.channel.RecvByteBufAllocator;
import io.netty.channel.WriteBufferWaterMark;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.PlatformDependent;

import java.net.Socket;
import java.net.SocketException;
import java.util.Map;

import static io.netty.channel.ChannelOption.*;

/**
 * The default {@link SocketChannelConfig} implementation.
 */
public class DefaultSocketChannelConfig extends DefaultChannelConfig
                                        implements SocketChannelConfig {

    protected final Socket javaSocket;
    private volatile boolean allowHalfClosure;

    /**
     * Creates a new instance.
     */
    public DefaultSocketChannelConfig(SocketChannel channel, Socket javaSocket) {
        super(channel);
        this.javaSocket = ObjectUtil.checkNotNull(javaSocket, "javaSocket");

        // Enable TCP_NODELAY by default if possible.
        if (PlatformDependent.canEnableTcpNoDelayByDefault()) {
            try {
                setTcpNoDelay(true);
            } catch (Exception e) {
                // Ignore.
            }
        }
    }

    @Override
    public Map, Object> getOptions() {
        return getOptions(
                super.getOptions(),
                SO_RCVBUF, SO_SNDBUF, TCP_NODELAY, SO_KEEPALIVE, SO_REUSEADDR, SO_LINGER, IP_TOS,
                ALLOW_HALF_CLOSURE);
    }

    @SuppressWarnings("unchecked")
    @Override
    public  T getOption(ChannelOption option) {
        if (option == SO_RCVBUF) {
            return (T) Integer.valueOf(getReceiveBufferSize());
        }
        if (option == SO_SNDBUF) {
            return (T) Integer.valueOf(getSendBufferSize());
        }
        if (option == TCP_NODELAY) {
            return (T) Boolean.valueOf(isTcpNoDelay());
        }
        if (option == SO_KEEPALIVE) {
            return (T) Boolean.valueOf(isKeepAlive());
        }
        if (option == SO_REUSEADDR) {
            return (T) Boolean.valueOf(isReuseAddress());
        }
        if (option == SO_LINGER) {
            return (T) Integer.valueOf(getSoLinger());
        }
        if (option == IP_TOS) {
            return (T) Integer.valueOf(getTrafficClass());
        }
        if (option == ALLOW_HALF_CLOSURE) {
            return (T) Boolean.valueOf(isAllowHalfClosure());
        }

        return super.getOption(option);
    }

    @Override
    public  boolean setOption(ChannelOption option, T value) {
        validate(option, value);

        if (option == SO_RCVBUF) {
            setReceiveBufferSize((Integer) value);
        } else if (option == SO_SNDBUF) {
            setSendBufferSize((Integer) value);
        } else if (option == TCP_NODELAY) {
            setTcpNoDelay((Boolean) value);
        } else if (option == SO_KEEPALIVE) {
            setKeepAlive((Boolean) value);
        } else if (option == SO_REUSEADDR) {
            setReuseAddress((Boolean) value);
        } else if (option == SO_LINGER) {
            setSoLinger((Integer) value);
        } else if (option == IP_TOS) {
            setTrafficClass((Integer) value);
        } else if (option == ALLOW_HALF_CLOSURE) {
            setAllowHalfClosure((Boolean) value);
        } else {
            return super.setOption(option, value);
        }

        return true;
    }

    @Override
    public int getReceiveBufferSize() {
        try {
            return javaSocket.getReceiveBufferSize();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getSendBufferSize() {
        try {
            return javaSocket.getSendBufferSize();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getSoLinger() {
        try {
            return javaSocket.getSoLinger();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getTrafficClass() {
        try {
            return javaSocket.getTrafficClass();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isKeepAlive() {
        try {
            return javaSocket.getKeepAlive();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isReuseAddress() {
        try {
            return javaSocket.getReuseAddress();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isTcpNoDelay() {
        try {
            return javaSocket.getTcpNoDelay();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    @Override
    public SocketChannelConfig setKeepAlive(boolean keepAlive) {
        try {
            javaSocket.setKeepAlive(keepAlive);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setPerformancePreferences(
            int connectionTime, int latency, int bandwidth) {
        javaSocket.setPerformancePreferences(connectionTime, latency, bandwidth);
        return this;
    }

    @Override
    public SocketChannelConfig setReceiveBufferSize(int receiveBufferSize) {
        try {
            javaSocket.setReceiveBufferSize(receiveBufferSize);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setReuseAddress(boolean reuseAddress) {
        try {
            javaSocket.setReuseAddress(reuseAddress);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setSendBufferSize(int sendBufferSize) {
        try {
            javaSocket.setSendBufferSize(sendBufferSize);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setSoLinger(int soLinger) {
        try {
            if (soLinger < 0) {
                javaSocket.setSoLinger(false, 0);
            } else {
                javaSocket.setSoLinger(true, soLinger);
            }
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setTcpNoDelay(boolean tcpNoDelay) {
        try {
            javaSocket.setTcpNoDelay(tcpNoDelay);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setTrafficClass(int trafficClass) {
        try {
            javaSocket.setTrafficClass(trafficClass);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public boolean isAllowHalfClosure() {
        return allowHalfClosure;
    }

    @Override
    public SocketChannelConfig setAllowHalfClosure(boolean allowHalfClosure) {
        this.allowHalfClosure = allowHalfClosure;
        return this;
    }

    @Override
    public SocketChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
        super.setConnectTimeoutMillis(connectTimeoutMillis);
        return this;
    }

    @Override
    @Deprecated
    public SocketChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
        super.setMaxMessagesPerRead(maxMessagesPerRead);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteSpinCount(int writeSpinCount) {
        super.setWriteSpinCount(writeSpinCount);
        return this;
    }

    @Override
    public SocketChannelConfig setAllocator(ByteBufAllocator allocator) {
        super.setAllocator(allocator);
        return this;
    }

    @Override
    public SocketChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
        super.setRecvByteBufAllocator(allocator);
        return this;
    }

    @Override
    public SocketChannelConfig setAutoRead(boolean autoRead) {
         super.setAutoRead(autoRead);
        return this;
    }

    @Override
    public SocketChannelConfig setAutoClose(boolean autoClose) {
        super.setAutoClose(autoClose);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
        super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
        super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteBufferWaterMark(WriteBufferWaterMark writeBufferWaterMark) {
        super.setWriteBufferWaterMark(writeBufferWaterMark);
        return this;
    }

    @Override
    public SocketChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
        super.setMessageSizeEstimator(estimator);
        return this;
    }
}




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