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/*
* Copyright (c) 2011, 2021 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021 IBM Corporation. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Gordon Yorke - Initial development
//
package org.eclipse.persistence.internal.jpa.querydef;
import java.io.Serializable;
import java.util.List;
import javax.persistence.criteria.Selection;
import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.internal.localization.ExceptionLocalization;
/**
* <p>
* <b>Purpose</b>: Contains the implementation of the Selection interface of the JPA
* criteria API.
* <p>
* <b>Description</b>: The Selection is the expression describing what should be returned by the query.
* <p>
*
* @see javax.persistence.criteria Join
*
* @author gyorke
* @since EclipseLink 1.2
*/
public abstract class SelectionImpl<X> implements Selection<X>, InternalSelection, Serializable{
protected Class<X> javaType;
protected Expression currentNode;
/**
* Returns the current EclipseLink expression at this node in the criteria expression tree
* @return the currentNode
*/
public Expression getCurrentNode() {
return currentNode;
}
protected String alias;
public <T> SelectionImpl(Class<X> javaType, Expression expressionNode){
this.javaType = javaType;
this.currentNode = expressionNode;
}
//SELECTION
/**
* Assign an alias to the selection.
*
* @param name
* alias
*/
public Selection<X> alias(String name) {
this.alias = name;
return this;
}
public String getAlias() {
return this.alias;
}
public Class<? extends X> getJavaType() {
return this.javaType;
}
public void setJavaType(Class<X> javaType) {
this.javaType = javaType;
}
/**
* Return selection items composing a compound selection
* @return list of selection items
* @throws IllegalStateException if selection is not a compound
* selection
*/
public List<Selection<?>> getCompoundSelectionItems(){
throw new IllegalStateException(ExceptionLocalization.buildMessage("CRITERIA_NOT_A_COMPOUND_SELECTION"));
}
/**
* Whether the selection item is a compound selection
* @return boolean
*/
public boolean isCompoundSelection(){
return false;
}
public boolean isFrom(){
return false;
}
public boolean isRoot(){
return false;
}
public boolean isConstructor(){
return false;
}
}
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