/*******************************************************************************
 * Copyright (c) 2009, 2011 SAP AG and others.
 * 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:
 *     SAP AG - initial API and implementation
 ******************************************************************************
 * $Id: FromClauseImpl.java,v 1.2 2011/03/05 21:52:05 auhl Exp $
 */
package dataaccess.query.impl;

import behavioral.actions.ActionsPackage;
import behavioral.actions.Iterator;

import dataaccess.expressions.Expression;
import dataaccess.expressions.ExpressionsPackage;

import dataaccess.query.FromClause;
import dataaccess.query.OqlQuery;
import dataaccess.query.QueryPackage;

import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.NotificationChain;

import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.InternalEObject;

import org.eclipse.emf.ecore.impl.ENotificationImpl;
import org.eclipse.emf.ecore.impl.EObjectImpl;

import org.eclipse.emf.ecore.util.EcoreUtil;

/**
 * <!-- begin-user-doc -->
 * An implementation of the model object '<em><b>From Clause</b></em>'.
 * <!-- end-user-doc -->
 * <p>
 * The following features are implemented:
 * <ul>
 *   <li>{@link dataaccess.query.impl.FromClauseImpl#getFromClauseOfOqlQuery <em>From Clause Of Oql Query</em>}</li>
 *   <li>{@link dataaccess.query.impl.FromClauseImpl#getFromExpression <em>From Expression</em>}</li>
 *   <li>{@link dataaccess.query.impl.FromClauseImpl#getAlias <em>Alias</em>}</li>
 * </ul>
 * </p>
 *
 * @generated
 */
public class FromClauseImpl extends EObjectImpl implements FromClause {
	/**
	 * The cached value of the '{@link #getFromExpression() <em>From Expression</em>}' containment reference.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see #getFromExpression()
	 * @generated
	 * @ordered
	 */
	protected Expression fromExpression;

	/**
	 * The cached value of the '{@link #getAlias() <em>Alias</em>}' containment reference.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see #getAlias()
	 * @generated
	 * @ordered
	 */
	protected Iterator alias;

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected FromClauseImpl() {
		super();
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	protected EClass eStaticClass() {
		return QueryPackage.Literals.FROM_CLAUSE;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public OqlQuery getFromClauseOfOqlQuery() {
		if (eContainerFeatureID() != QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY) return null;
		return (OqlQuery)eContainer();
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public OqlQuery basicGetFromClauseOfOqlQuery() {
		if (eContainerFeatureID() != QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY) return null;
		return (OqlQuery)eInternalContainer();
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public NotificationChain basicSetFromClauseOfOqlQuery(OqlQuery newFromClauseOfOqlQuery, NotificationChain msgs) {
		msgs = eBasicSetContainer((InternalEObject)newFromClauseOfOqlQuery, QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY, msgs);
		return msgs;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setFromClauseOfOqlQuery(OqlQuery newFromClauseOfOqlQuery) {
		if (newFromClauseOfOqlQuery != eInternalContainer() || (eContainerFeatureID() != QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY && newFromClauseOfOqlQuery != null)) {
			if (EcoreUtil.isAncestor(this, newFromClauseOfOqlQuery))
				throw new IllegalArgumentException("Recursive containment not allowed for " + toString());
			NotificationChain msgs = null;
			if (eInternalContainer() != null)
				msgs = eBasicRemoveFromContainer(msgs);
			if (newFromClauseOfOqlQuery != null)
				msgs = ((InternalEObject)newFromClauseOfOqlQuery).eInverseAdd(this, QueryPackage.OQL_QUERY__FROM_CLAUSES, OqlQuery.class, msgs);
			msgs = basicSetFromClauseOfOqlQuery(newFromClauseOfOqlQuery, msgs);
			if (msgs != null) msgs.dispatch();
		}
		else if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET, QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY, newFromClauseOfOqlQuery, newFromClauseOfOqlQuery));
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public Expression getFromExpression() {
		if (fromExpression != null && fromExpression.eIsProxy()) {
			InternalEObject oldFromExpression = (InternalEObject)fromExpression;
			fromExpression = (Expression)eResolveProxy(oldFromExpression);
			if (fromExpression != oldFromExpression) {
				InternalEObject newFromExpression = (InternalEObject)fromExpression;
				NotificationChain msgs =  oldFromExpression.eInverseRemove(this, ExpressionsPackage.EXPRESSION__FROM_CLAUSE, Expression.class, null);
				if (newFromExpression.eInternalContainer() == null) {
					msgs =  newFromExpression.eInverseAdd(this, ExpressionsPackage.EXPRESSION__FROM_CLAUSE, Expression.class, msgs);
				}
				if (msgs != null) msgs.dispatch();
				if (eNotificationRequired())
					eNotify(new ENotificationImpl(this, Notification.RESOLVE, QueryPackage.FROM_CLAUSE__FROM_EXPRESSION, oldFromExpression, fromExpression));
			}
		}
		return fromExpression;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public Expression basicGetFromExpression() {
		return fromExpression;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public NotificationChain basicSetFromExpression(Expression newFromExpression, NotificationChain msgs) {
		Expression oldFromExpression = fromExpression;
		fromExpression = newFromExpression;
		if (eNotificationRequired()) {
			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, QueryPackage.FROM_CLAUSE__FROM_EXPRESSION, oldFromExpression, newFromExpression);
			if (msgs == null) msgs = notification; else msgs.add(notification);
		}
		return msgs;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setFromExpression(Expression newFromExpression) {
		if (newFromExpression != fromExpression) {
			NotificationChain msgs = null;
			if (fromExpression != null)
				msgs = ((InternalEObject)fromExpression).eInverseRemove(this, ExpressionsPackage.EXPRESSION__FROM_CLAUSE, Expression.class, msgs);
			if (newFromExpression != null)
				msgs = ((InternalEObject)newFromExpression).eInverseAdd(this, ExpressionsPackage.EXPRESSION__FROM_CLAUSE, Expression.class, msgs);
			msgs = basicSetFromExpression(newFromExpression, msgs);
			if (msgs != null) msgs.dispatch();
		}
		else if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET, QueryPackage.FROM_CLAUSE__FROM_EXPRESSION, newFromExpression, newFromExpression));
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public Iterator getAlias() {
		if (alias != null && alias.eIsProxy()) {
			InternalEObject oldAlias = (InternalEObject)alias;
			alias = (Iterator)eResolveProxy(oldAlias);
			if (alias != oldAlias) {
				InternalEObject newAlias = (InternalEObject)alias;
				NotificationChain msgs =  oldAlias.eInverseRemove(this, ActionsPackage.ITERATOR__FROM_CLAUSE, Iterator.class, null);
				if (newAlias.eInternalContainer() == null) {
					msgs =  newAlias.eInverseAdd(this, ActionsPackage.ITERATOR__FROM_CLAUSE, Iterator.class, msgs);
				}
				if (msgs != null) msgs.dispatch();
				if (eNotificationRequired())
					eNotify(new ENotificationImpl(this, Notification.RESOLVE, QueryPackage.FROM_CLAUSE__ALIAS, oldAlias, alias));
			}
		}
		return alias;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public Iterator basicGetAlias() {
		return alias;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public NotificationChain basicSetAlias(Iterator newAlias, NotificationChain msgs) {
		Iterator oldAlias = alias;
		alias = newAlias;
		if (eNotificationRequired()) {
			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, QueryPackage.FROM_CLAUSE__ALIAS, oldAlias, newAlias);
			if (msgs == null) msgs = notification; else msgs.add(notification);
		}
		return msgs;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setAlias(Iterator newAlias) {
		if (newAlias != alias) {
			NotificationChain msgs = null;
			if (alias != null)
				msgs = ((InternalEObject)alias).eInverseRemove(this, ActionsPackage.ITERATOR__FROM_CLAUSE, Iterator.class, msgs);
			if (newAlias != null)
				msgs = ((InternalEObject)newAlias).eInverseAdd(this, ActionsPackage.ITERATOR__FROM_CLAUSE, Iterator.class, msgs);
			msgs = basicSetAlias(newAlias, msgs);
			if (msgs != null) msgs.dispatch();
		}
		else if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET, QueryPackage.FROM_CLAUSE__ALIAS, newAlias, newAlias));
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public NotificationChain eInverseAdd(InternalEObject otherEnd, int featureID, NotificationChain msgs) {
		switch (featureID) {
			case QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY:
				if (eInternalContainer() != null)
					msgs = eBasicRemoveFromContainer(msgs);
				return basicSetFromClauseOfOqlQuery((OqlQuery)otherEnd, msgs);
			case QueryPackage.FROM_CLAUSE__FROM_EXPRESSION:
				if (fromExpression != null)
					msgs = ((InternalEObject)fromExpression).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - QueryPackage.FROM_CLAUSE__FROM_EXPRESSION, null, msgs);
				return basicSetFromExpression((Expression)otherEnd, msgs);
			case QueryPackage.FROM_CLAUSE__ALIAS:
				if (alias != null)
					msgs = ((InternalEObject)alias).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - QueryPackage.FROM_CLAUSE__ALIAS, null, msgs);
				return basicSetAlias((Iterator)otherEnd, msgs);
		}
		return super.eInverseAdd(otherEnd, featureID, msgs);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public NotificationChain eInverseRemove(InternalEObject otherEnd, int featureID, NotificationChain msgs) {
		switch (featureID) {
			case QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY:
				return basicSetFromClauseOfOqlQuery(null, msgs);
			case QueryPackage.FROM_CLAUSE__FROM_EXPRESSION:
				return basicSetFromExpression(null, msgs);
			case QueryPackage.FROM_CLAUSE__ALIAS:
				return basicSetAlias(null, msgs);
		}
		return super.eInverseRemove(otherEnd, featureID, msgs);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public NotificationChain eBasicRemoveFromContainerFeature(NotificationChain msgs) {
		switch (eContainerFeatureID()) {
			case QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY:
				return eInternalContainer().eInverseRemove(this, QueryPackage.OQL_QUERY__FROM_CLAUSES, OqlQuery.class, msgs);
		}
		return super.eBasicRemoveFromContainerFeature(msgs);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public Object eGet(int featureID, boolean resolve, boolean coreType) {
		switch (featureID) {
			case QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY:
				if (resolve) return getFromClauseOfOqlQuery();
				return basicGetFromClauseOfOqlQuery();
			case QueryPackage.FROM_CLAUSE__FROM_EXPRESSION:
				if (resolve) return getFromExpression();
				return basicGetFromExpression();
			case QueryPackage.FROM_CLAUSE__ALIAS:
				if (resolve) return getAlias();
				return basicGetAlias();
		}
		return super.eGet(featureID, resolve, coreType);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public void eSet(int featureID, Object newValue) {
		switch (featureID) {
			case QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY:
				setFromClauseOfOqlQuery((OqlQuery)newValue);
				return;
			case QueryPackage.FROM_CLAUSE__FROM_EXPRESSION:
				setFromExpression((Expression)newValue);
				return;
			case QueryPackage.FROM_CLAUSE__ALIAS:
				setAlias((Iterator)newValue);
				return;
		}
		super.eSet(featureID, newValue);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public void eUnset(int featureID) {
		switch (featureID) {
			case QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY:
				setFromClauseOfOqlQuery((OqlQuery)null);
				return;
			case QueryPackage.FROM_CLAUSE__FROM_EXPRESSION:
				setFromExpression((Expression)null);
				return;
			case QueryPackage.FROM_CLAUSE__ALIAS:
				setAlias((Iterator)null);
				return;
		}
		super.eUnset(featureID);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public boolean eIsSet(int featureID) {
		switch (featureID) {
			case QueryPackage.FROM_CLAUSE__FROM_CLAUSE_OF_OQL_QUERY:
				return basicGetFromClauseOfOqlQuery() != null;
			case QueryPackage.FROM_CLAUSE__FROM_EXPRESSION:
				return fromExpression != null;
			case QueryPackage.FROM_CLAUSE__ALIAS:
				return alias != null;
		}
		return super.eIsSet(featureID);
	}

} //FromClauseImpl