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package cdc.mf.ea;

import cdc.mf.model.MfTipSide;
import cdc.util.lang.UnexpectedValueException;

/**
 * Enumeration of roles that an object can play in a connection.
 *
 * @author Damien Carbonne
 */
public enum EaConnectionRole {
    /** A class extends another class, or interface extends another interface. */
    EXTENDS(MfTipSide.SOURCE, "specialization"),
    /** A class is extended by another class, or interface is extended by another interface. */
    EXTENDED_BY(MfTipSide.TARGET, "generalization"),
    /** A class implements an interface. */
    IMPLEMENTS(MfTipSide.SOURCE, "implementation"),
    /** An interface is implemented by a class. */
    IMPLEMENTED_BY(MfTipSide.TARGET, "implemented"),
    /** A class or interface (whole) aggregates another class or interface (part). */
    WHOLE(MfTipSide.SOURCE, "whole"),
    /** A class or interface (part) is aggregated by another class or interface (whole). */
    PART(MfTipSide.TARGET, "part"),
    ANNOTATES(MfTipSide.SOURCE, "annotation"),
    ANNOTATED_BY(MfTipSide.TARGET, "annotated"),
    /** A class or interface (source) is associated to another class or interface (target). */
    ASSOCIATION_SRC(MfTipSide.SOURCE, "source"),
    /** A class or interface (target) is associated to another class or interface (source). */
    ASSOCIATION_TGT(MfTipSide.TARGET, "target"),
    /** An element that depends on another element, a dependency source. */
    DEPENDER(MfTipSide.SOURCE, "depender"),
    /** An element that is depended on by another element, a dependency target. */
    DEPENDEE(MfTipSide.TARGET, "dependee");

    private final MfTipSide side;
    private final String literal;

    private EaConnectionRole(MfTipSide side,
                             String literal) {
        this.side = side;
        this.literal = literal;
    }

    public MfTipSide getSide() {
        return side;
    }

    public EaConnectorType getConnectorType() {
        switch (this) {
        case PART, WHOLE:
            return EaConnectorType.AGGREGATION;
        case ANNOTATED_BY, ANNOTATES:
            return EaConnectorType.ANNOTATION;
        case ASSOCIATION_SRC, ASSOCIATION_TGT:
            return EaConnectorType.ASSOCIATION;
        case EXTENDED_BY, EXTENDS:
            return EaConnectorType.GENERALIZATION;
        case IMPLEMENTED_BY, IMPLEMENTS:
            return EaConnectorType.IMPLEMENTATION;
        case DEPENDER, DEPENDEE:
            return EaConnectorType.DEPENDENCY;
        default:
            throw new UnexpectedValueException(this);
        }
    }

    public String getLiteral() {
        return literal;
    }
}