/*******************************************************************************
 * Copyright (c) 2009, 2018 SAP AG and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v20.html
 * 
 * Contributors:
 *     SAP AG - initial API and implementation
 ******************************************************************************
 */
package dataaccess.expressions;

/**
 * <!-- begin-user-doc -->
 * A representation of the model object '<em><b>Equals</b></em>'.
 * <!-- end-user-doc -->
 *
 * <!-- begin-model-doc -->
 * compares two or more values/objects. Entity type instances are compared based on their identity. Value type instances are compared by their value. The type of an Equals expression is Boolean.
 * 
 * The getType() implementation can only infer the type once TypeDefinition is a value type, values of which can be constructed in an OCL expression.
 * <!-- end-model-doc -->
 *
 * <p>
 * The following features are supported:
 * <ul>
 *   <li>{@link dataaccess.expressions.Equals#getLeft <em>Left</em>}</li>
 *   <li>{@link dataaccess.expressions.Equals#getRight <em>Right</em>}</li>
 * </ul>
 * </p>
 *
 * @see dataaccess.expressions.ExpressionsPackage#getEquals()
 * @model annotation="http://www.eclipse.org/emf/2002/Ecore/OCL ConformaceOneWayOrAnother='self.left.getType().conformsTo(self.right.getType()) or\r\n  self.right.getType().conformsTo(self.left.getType())'"
 *        annotation="http://www.eclipse.org/emf/2002/Ecore constraints='ConformaceOneWayOrAnother'"
 * @generated
 */
public interface Equals extends Expression {
	/**
	 * Returns the value of the '<em><b>Left</b></em>' containment reference.
	 * It is bidirectional and its opposite is '{@link dataaccess.expressions.Expression#getLeftOfEquals <em>Left Of Equals</em>}'.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of the '<em>Left</em>' containment reference isn't clear,
	 * there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @return the value of the '<em>Left</em>' containment reference.
	 * @see #setLeft(Expression)
	 * @see dataaccess.expressions.ExpressionsPackage#getEquals_Left()
	 * @see dataaccess.expressions.Expression#getLeftOfEquals
	 * @model opposite="leftOfEquals" containment="true" resolveProxies="true" required="true"
	 * @generated
	 */
	Expression getLeft();

	/**
	 * Sets the value of the '{@link dataaccess.expressions.Equals#getLeft <em>Left</em>}' containment reference.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @param value the new value of the '<em>Left</em>' containment reference.
	 * @see #getLeft()
	 * @generated
	 */
	void setLeft(Expression value);

	/**
	 * Returns the value of the '<em><b>Right</b></em>' containment reference.
	 * It is bidirectional and its opposite is '{@link dataaccess.expressions.Expression#getRightOfEquals <em>Right Of Equals</em>}'.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of the '<em>Right</em>' containment reference isn't clear,
	 * there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @return the value of the '<em>Right</em>' containment reference.
	 * @see #setRight(Expression)
	 * @see dataaccess.expressions.ExpressionsPackage#getEquals_Right()
	 * @see dataaccess.expressions.Expression#getRightOfEquals
	 * @model opposite="rightOfEquals" containment="true" resolveProxies="true" required="true"
	 * @generated
	 */
	Expression getRight();

	/**
	 * Sets the value of the '{@link dataaccess.expressions.Equals#getRight <em>Right</em>}' containment reference.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @param value the new value of the '<em>Right</em>' containment reference.
	 * @see #getRight()
	 * @generated
	 */
	void setRight(Expression value);

} // Equals