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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2011-2016 Incapture Technologies LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package rapture.dsl.serfun;

import java.util.List;

import rapture.common.Hose;
import rapture.common.SeriesValue;

import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.collect.ImmutableList;

/**
 * An abstract class for connectors with only one input and one output.
 * 
 * @author mel
 *
 */
public abstract class SimpleHose extends StreamHose {
    private static final List KEYS = ImmutableList.of("");
    protected Hose downstream;
    protected SeriesValue upstream;
    protected int downstreamIndex;
    protected int upstreamIndex;
    
    public SimpleHose() {}
    
    public SimpleHose(HoseArg input) {
        input.bind(this, 0, 0);
    }
    
    @Override
    public List getInputKeys() { return KEYS; }
    
    @Override
    public List getOutputKeys() { return KEYS; }
    
    
    @Override
    public void bindReceiver(Hose receiver, int senderIndex, int receiverIndex) {
        checkArgument(senderIndex == 0, getName() +" has no such output " + senderIndex);
        this.downstream = receiver;
        this.downstreamIndex = receiverIndex;
    }
    
    @Override
    public void bindSender(Hose sender, int senderIndex, int receiverIndex) {
        checkArgument(receiverIndex == 0, getName() +" has no such input " + receiverIndex);
        this.upstream = sender;
        this.upstreamIndex = senderIndex;
    }
    
    @Override
    public SeriesValue pullValue(int index) {
        return pullValue();
    }
    
    @Override
    public void pushValue(SeriesValue v, int index) {
        pushValue(v);
    }
    
    @Override
    public void terminateStream(int index) {
        terminateStream();
    }

    @Override
    public void terminateStream() {
        terminated = true;
        downstream.terminateStream(downstreamIndex);
    }
    
    public SeriesValue pullFromUpstream() {
        return upstream.pullValue(upstreamIndex);
    }
}