/******************************************************************************* | |
* Copyright (c) 1998, 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: | |
* 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. | |
*/ | |
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. | |
*/ | |
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 | |
*/ | |
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; | |
} | |
} |