| /* |
| * Copyright (c) 1998, 2020 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.jpa.parsing; |
| |
| import org.eclipse.persistence.expressions.*; |
| |
| /** |
| * INTERNAL |
| * <p><b>Purpose</b>: Represent a SUBSTRING |
| * <p><b>Responsibilities</b>:<ul> |
| * <li> Generate the correct expression for SUBSTRING |
| * </ul> |
| * @author Jon Driscoll and Joel Lucuik |
| * @since TopLink 4.0 |
| */ |
| public class SubstringNode extends StringFunctionNode { |
| private Node startPosition = null; |
| private Node stringLength = null; |
| |
| /** |
| * SubstringNode constructor comment. |
| */ |
| public SubstringNode() { |
| super(); |
| } |
| |
| /** |
| * INTERNAL |
| * Check the child nodes for an unqualified field access and if so, |
| * replace them by a qualified field access. |
| */ |
| @Override |
| public Node qualifyAttributeAccess(ParseTreeContext context) { |
| if (left != null) { |
| left = left.qualifyAttributeAccess(context); |
| } |
| if (startPosition != null) { |
| startPosition = startPosition.qualifyAttributeAccess(context); |
| } |
| if (stringLength != null) { |
| stringLength = stringLength.qualifyAttributeAccess(context); |
| } |
| return this; |
| } |
| |
| /** |
| * INTERNAL |
| * Validate node and calculate its type. |
| */ |
| @Override |
| public void validate(ParseTreeContext context) { |
| TypeHelper typeHelper = context.getTypeHelper(); |
| if (left != null) { |
| left.validate(context); |
| left.validateParameter(context, typeHelper.getStringType()); |
| } |
| if (startPosition != null) { |
| startPosition.validate(context); |
| startPosition.validateParameter(context, typeHelper.getIntType()); |
| } |
| if (stringLength != null) { |
| stringLength.validate(context); |
| stringLength.validateParameter(context, typeHelper.getIntType()); |
| } |
| setType(typeHelper.getStringType()); |
| } |
| |
| /** |
| * INTERNAL |
| * Generate the EclipseLink expression for this node |
| */ |
| @Override |
| public Expression generateExpression(GenerationContext context) { |
| Expression whereClause = getLeft().generateExpression(context); |
| Expression startPosition = getStartPosition().generateExpression(context); |
| if (getStringLength() != null){ |
| Expression stringLength = getStringLength().generateExpression(context); |
| whereClause = whereClause.substring(startPosition, stringLength); |
| } else { |
| whereClause = whereClause.substring(startPosition); |
| } |
| return whereClause; |
| } |
| |
| /** |
| * Return the start position object |
| */ |
| private Node getStartPosition() { |
| return startPosition; |
| } |
| |
| /** |
| * Return the string length object |
| */ |
| private Node getStringLength() { |
| return stringLength; |
| } |
| |
| /** |
| * Insert the method's description here. |
| * Creation date: (1/19/01 3:41:55 PM) |
| * @param newStartPosition java.lang.Integer |
| */ |
| public void setStartPosition(Node newStartPosition) { |
| startPosition = newStartPosition; |
| } |
| |
| /** |
| * Insert the method's description here. |
| * Creation date: (1/19/01 3:42:26 PM) |
| * @param newStringLength java.lang.Integer |
| */ |
| public void setStringLength(Node newStringLength) { |
| stringLength = newStringLength; |
| } |
| } |