| /* |
| * Copyright (c) 1998, 2021 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 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: |
| // Oracle - initial API and implementation from Oracle TopLink |
| package org.eclipse.persistence.internal.expressions; |
| |
| import java.util.*; |
| import org.eclipse.persistence.expressions.*; |
| |
| /** |
| * Generic class for an expression with a base. |
| * The base is the expression that this one is derived from. |
| */ |
| public abstract class BaseExpression extends Expression { |
| |
| /** The base expression is what this was derived from. */ |
| protected Expression baseExpression; |
| /** PERF: Used to cache the builder. */ |
| protected ExpressionBuilder builder; |
| |
| protected BaseExpression() { |
| super(); |
| } |
| |
| protected BaseExpression(Expression baseExpression) { |
| super(); |
| this.baseExpression = baseExpression; |
| } |
| |
| /** |
| * The base expression is what the parameter was derived from. |
| */ |
| public Expression getBaseExpression() { |
| return baseExpression; |
| } |
| |
| /** |
| * Return the expression builder which is the ultimate base of this expression, or |
| * null if there isn't one (shouldn't happen if we start from a root). |
| */ |
| @Override |
| public ExpressionBuilder getBuilder() { |
| if ((this.builder == null) && (baseExpression != null)) { |
| this.builder = baseExpression.getBuilder(); |
| } |
| return this.builder; |
| } |
| |
| /** |
| * INTERNAL: |
| * Used for cloning. |
| */ |
| @Override |
| protected void postCopyIn(Map alreadyDone) { |
| super.postCopyIn(alreadyDone); |
| if (this.baseExpression != null) { |
| setBaseExpression(this.baseExpression.copiedVersionFrom(alreadyDone)); |
| } |
| } |
| |
| /** |
| * INTERNAL: |
| * Search the tree for any expressions (like SubSelectExpressions) that have been |
| * built using a builder that is not attached to the query. This happens in case of an Exists |
| * call using a new ExpressionBuilder(). This builder needs to be replaced with one from the query. |
| */ |
| @Override |
| public void resetPlaceHolderBuilder(ExpressionBuilder queryBuilder){ |
| if (this.baseExpression != null){ |
| this.baseExpression.resetPlaceHolderBuilder(queryBuilder); |
| } |
| |
| } |
| |
| /** |
| * The base expression is what the parameter was derived from. |
| * This is used for nested parameters. |
| */ |
| public void setBaseExpression(Expression baseExpression) { |
| this.baseExpression = baseExpression; |
| this.builder = null; |
| } |
| |
| /** |
| * INTERNAL: |
| * Clear the builder when cloning. |
| */ |
| @Override |
| public Expression shallowClone() { |
| BaseExpression clone = (BaseExpression)super.shallowClone(); |
| clone.builder = null; |
| return clone; |
| } |
| } |