/**
 * *******************************************************************************
 * Copyright (c) 2008 Hatha Systems.
 * 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:
 *     Nikolai Mansourov (Hatha Systems) - initial API and implementation
 * *******************************************************************************
 *
 * $Id$
 */
package org.eclipse.gmt.modisco.omg.kdm.data.impl;

import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.InternalEObject;
import org.eclipse.emf.ecore.impl.ENotificationImpl;
import org.eclipse.gmt.modisco.omg.kdm.core.impl.KDMRelationshipImpl;
import org.eclipse.gmt.modisco.omg.kdm.data.ContentItem;
import org.eclipse.gmt.modisco.omg.kdm.data.DataPackage;
import org.eclipse.gmt.modisco.omg.kdm.data.ReferenceTo;

/**
 * <!-- begin-user-doc -->
 * An implementation of the model object '<em><b>Reference To</b></em>'.
 * <!-- end-user-doc -->
 * <p>
 * The following features are implemented:
 * <ul>
 *   <li>{@link org.eclipse.gmt.modisco.omg.kdm.data.impl.ReferenceToImpl#getTo <em>To</em>}</li>
 *   <li>{@link org.eclipse.gmt.modisco.omg.kdm.data.impl.ReferenceToImpl#getFrom <em>From</em>}</li>
 * </ul>
 * </p>
 *
 * @generated
 */
public class ReferenceToImpl extends KDMRelationshipImpl implements ReferenceTo {
	/**
	 * The cached value of the '{@link #getTo() <em>To</em>}' reference.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see #getTo()
	 * @generated
	 * @ordered
	 */
	protected ContentItem to;

	/**
	 * The cached value of the '{@link #getFrom() <em>From</em>}' reference.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see #getFrom()
	 * @generated
	 * @ordered
	 */
	protected ContentItem from;

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected ReferenceToImpl() {
		super();
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	protected EClass eStaticClass() {
		return DataPackage.Literals.REFERENCE_TO;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public ContentItem getTo() {
		if (to != null && to.eIsProxy()) {
			InternalEObject oldTo = (InternalEObject)to;
			to = (ContentItem)eResolveProxy(oldTo);
			if (to != oldTo) {
				if (eNotificationRequired())
					eNotify(new ENotificationImpl(this, Notification.RESOLVE, DataPackage.REFERENCE_TO__TO, oldTo, to));
			}
		}
		return to;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public ContentItem basicGetTo() {
		return to;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setTo(ContentItem newTo) {
		ContentItem oldTo = to;
		to = newTo;
		if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET, DataPackage.REFERENCE_TO__TO, oldTo, to));
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public ContentItem getFrom() {
		if (from != null && from.eIsProxy()) {
			InternalEObject oldFrom = (InternalEObject)from;
			from = (ContentItem)eResolveProxy(oldFrom);
			if (from != oldFrom) {
				if (eNotificationRequired())
					eNotify(new ENotificationImpl(this, Notification.RESOLVE, DataPackage.REFERENCE_TO__FROM, oldFrom, from));
			}
		}
		return from;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public ContentItem basicGetFrom() {
		return from;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setFrom(ContentItem newFrom) {
		ContentItem oldFrom = from;
		from = newFrom;
		if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET, DataPackage.REFERENCE_TO__FROM, oldFrom, from));
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public Object eGet(int featureID, boolean resolve, boolean coreType) {
		switch (featureID) {
			case DataPackage.REFERENCE_TO__TO:
				if (resolve) return getTo();
				return basicGetTo();
			case DataPackage.REFERENCE_TO__FROM:
				if (resolve) return getFrom();
				return basicGetFrom();
		}
		return super.eGet(featureID, resolve, coreType);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public void eSet(int featureID, Object newValue) {
		switch (featureID) {
			case DataPackage.REFERENCE_TO__TO:
				setTo((ContentItem)newValue);
				return;
			case DataPackage.REFERENCE_TO__FROM:
				setFrom((ContentItem)newValue);
				return;
		}
		super.eSet(featureID, newValue);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public void eUnset(int featureID) {
		switch (featureID) {
			case DataPackage.REFERENCE_TO__TO:
				setTo((ContentItem)null);
				return;
			case DataPackage.REFERENCE_TO__FROM:
				setFrom((ContentItem)null);
				return;
		}
		super.eUnset(featureID);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public boolean eIsSet(int featureID) {
		switch (featureID) {
			case DataPackage.REFERENCE_TO__TO:
				return to != null;
			case DataPackage.REFERENCE_TO__FROM:
				return from != null;
		}
		return super.eIsSet(featureID);
	}

} //ReferenceToImpl