/**
 * Copyright (c) 2009-2010 Thales Corporate Services S.A.S.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * Thales Corporate Services S.A.S - initial API and implementation
 */
package org.eclipse.egf.model.fcore.helper;

import java.util.Collection;
import java.util.Iterator;

import org.eclipse.egf.model.fcore.ContractMode;
import org.eclipse.egf.model.fcore.InvocationContract;
import org.eclipse.egf.model.fcore.OrchestrationParameter;
import org.eclipse.emf.common.util.UniqueEList;

/**
 * @author Xavier Maysonnave
 * 
 */
public class OrchestrationParameterHelper {

    private OrchestrationParameterHelper() {
        // Prevent Instantiation
    }

    public static Collection<InvocationContract> getAvailableInvocationContracts(OrchestrationParameter orchestrationParameter) {
        Collection<InvocationContract> result = new UniqueEList<InvocationContract>();
        if (orchestrationParameter.getType() == null) {
            return result;
        }
        // Retrieve all the InvocationContracts based on their types and mode
        result.addAll(orchestrationParameter.getOrchestration().getInvocationContracts(orchestrationParameter.getType()));
        if (result.isEmpty()) {
            return result;
        }
        // Filter
        for (Iterator<InvocationContract> it = result.iterator(); it.hasNext();) {
            InvocationContract invocationContract = it.next();
            if (invocationContract.getInvokedMode() == ContractMode.OUT) {
                // Only In or In_Out mode are assignable to an OrchestrationParameter
                // They have an In semantic in this area
                it.remove();
            } else {
                if (invocationContract.getFactoryComponentContract() != null) {
                    if (invocationContract.getInvokedMode() == ContractMode.IN) {
                        // Filter InvocationContract with In mode already assigned to a FactoryComponentContract
                        it.remove();
                    } else if (invocationContract.getFactoryComponentContract().getMode() != ContractMode.OUT) {
                        // Filter InvocationContract with In_Out mode already assigned to an In or In_Out FactoryComponentContract
                        it.remove();
                    }
                }
                if (invocationContract.getSourceInvocationContract() != null) {
                    if (invocationContract.getInvokedMode() == ContractMode.IN) {
                        // Filter InvocationContract with In mode already assigned to a SourceInvocationContract
                        it.remove();
                    }
                }
            }
        }
        // Filter InvocationContract already assigned to an OrchestrationParameter
        for (OrchestrationParameter innerOrchestrationParameter : orchestrationParameter.getOrchestrationParameterContainer().getOrchestrationParameters()) {
            if (orchestrationParameter == innerOrchestrationParameter) {
                continue;
            }
            for (InvocationContract invocationContract : innerOrchestrationParameter.getInvocationContracts()) {
                result.remove(invocationContract);
            }
        }
        return result;
    }

}