| /* |
| * 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 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. |
| */ |
| @Override |
| public String getAsString() { |
| StringBuilder repr = new StringBuilder(); |
| 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(); |
| } |
| |
| } |