/******************************************************************************* | |
* 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 java.util.*; | |
import org.eclipse.persistence.queries.ReportQuery; | |
import org.eclipse.persistence.queries.ObjectLevelReadQuery; | |
/** | |
* INTERNAL | |
* <p><b>Purpose</b>: Represent an GROUP BY | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> Generate the correct expression for an GROUP BY | |
* </ul> | |
*/ | |
public class GroupByNode extends MajorNode { | |
List groupByItems = null; | |
/** | |
* Return a new GroupByNode. | |
*/ | |
public GroupByNode() { | |
super(); | |
} | |
/** | |
* INTERNAL | |
* Validate the current node. | |
*/ | |
public void validate(ParseTreeContext context, SelectNode selectNode) { | |
for (Iterator i = groupByItems.iterator(); i.hasNext(); ) { | |
Node item = (Node)i.next(); | |
item.validate(context); | |
} | |
} | |
/** | |
* INTERNAL | |
* Add the grouping expressions to the passed query | |
*/ | |
public void addGroupingToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) { | |
if (theQuery.isReportQuery()) { | |
Iterator iter = getGroupByItems().iterator(); | |
while (iter.hasNext()) { | |
Node nextNode = (Node)iter.next(); | |
((ReportQuery)theQuery).addGrouping(nextNode.generateExpression(context)); | |
} | |
} | |
} | |
/** | |
* INTERNAL | |
* Returns true if the sp | |
*/ | |
public boolean isValidHavingExpr(Node expr) { | |
if (expr.isDotNode() || expr.isVariableNode()) { | |
return isGroupbyItem(expr); | |
} else { | |
// delegate to child node if any | |
Node left = expr.getLeft(); | |
Node right = expr.getRight(); | |
return ((left == null) || isValidHavingExpr(left)) && | |
((right == null) || isValidHavingExpr(right)); | |
} | |
} | |
/** | |
* INTERNAL | |
* Return true if the specified expr is a groupby item. | |
*/ | |
private boolean isGroupbyItem(Node expr) { | |
if (expr.isDotNode() || expr.isVariableNode()) { | |
String exprRepr = expr.getAsString(); | |
for (Iterator i = groupByItems.iterator(); i.hasNext();) { | |
Node item = (Node)i.next(); | |
String itemRepr = item.getAsString(); | |
if (exprRepr.equals(itemRepr)) { | |
return true; | |
} | |
} | |
} | |
return false; | |
} | |
/** | |
* INTERNAL | |
* Return the GROUP BY statements | |
*/ | |
public List getGroupByItems() { | |
if (groupByItems == null) { | |
setGroupByItems(new Vector()); | |
} | |
return groupByItems; | |
} | |
/** | |
* INTERNAL | |
* Set the GROUP BY statements | |
*/ | |
public void setGroupByItems(List newItems) { | |
groupByItems = newItems; | |
} | |
/** | |
* INTERNAL | |
* Get the string representation of this node. | |
*/ | |
public String getAsString() { | |
StringBuffer repr = new StringBuffer(); | |
for (Iterator i = groupByItems.iterator(); i.hasNext(); ) { | |
Node expr = (Node)i.next(); | |
if (repr.length() > 0) { | |
repr.append(", "); | |
} | |
repr.append(expr.getAsString()); | |
} | |
return "GROUP BY " + repr.toString(); | |
} | |
} |