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/*
 * Fabric3
 * Copyright (c) 2009-2013 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
 * you are not obligated to do so. If you do not wish to do so,
 * delete this exception statement from your version.
 *
 * Fabric3 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
 *
 * ----------------------------------------------------
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 *
 */
package org.fabric3.fabric.wire;

import org.fabric3.spi.model.physical.PhysicalOperationDefinition;
import org.fabric3.spi.wire.Interceptor;
import org.fabric3.spi.wire.InvocationChain;

/**
 * Default implementation of an invocation chain.
 */
public class InvocationChainImpl implements InvocationChain {
    protected PhysicalOperationDefinition physicalOperation;
    protected Interceptor interceptorChainHead;
    protected Interceptor interceptorChainTail;

    public InvocationChainImpl(PhysicalOperationDefinition operation) {
        this.physicalOperation = operation;
    }

    public PhysicalOperationDefinition getPhysicalOperation() {
        return physicalOperation;
    }

    public void addInterceptor(Interceptor interceptor) {
        if (interceptorChainHead == null) {
            interceptorChainHead = interceptor;
        } else {
            interceptorChainTail.setNext(interceptor);
        }
        interceptorChainTail = interceptor;
    }

    public void addInterceptor(int index, Interceptor interceptor) {
        int i = 0;
        Interceptor next = interceptorChainHead;
        Interceptor prev = null;
        while (next != null && i < index) {
            prev = next;
            next = next.getNext();
            i++;
        }
        if (i == index) {
            if (prev != null) {
                prev.setNext(interceptor);
            } else {
                interceptorChainHead = interceptor;
            }
            interceptor.setNext(next);
            if (next == null) {
                interceptorChainTail = interceptor;
            }
        } else {
            throw new ArrayIndexOutOfBoundsException(index);
        }
    }

    public Interceptor getHeadInterceptor() {
        return interceptorChainHead;
    }

    public Interceptor getTailInterceptor() {
        return interceptorChainTail;
    }

}