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/*******************************************************************************
* Copyright (c) 2011, 2013 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Gordon Yorke - Initial development
*
******************************************************************************/package org.eclipse.persistence.internal.jpa.querydef;
/**
*
* Purpose: Represents an Expression in the Criteria API implementation heirarchy.
*
* Description: Expressions are expression nodes that can not be joined from
* and may or not be the result of a Path expression. The SubQuery is a special type of expression that
* requires certain methods but can not extend ExpressionImpl. This interface provide a common API.
*
*
* @see javax.persistence.criteria Expression
*
* @author gyorke
* @since EclipseLink 1.2
*/
public interface InternalExpression{
public boolean isPredicate();
public boolean isCompoundExpression();
public boolean isExpression();
public boolean isLiteral();
public boolean isParameter();
public boolean isSubquery();
//conjunction or disjunction
public boolean isJunction();
}