/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.sql.visitor;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;
import org.teiid.query.sql.LanguageObject;
import org.teiid.query.sql.symbol.ElementSymbol;
import org.teiid.query.sql.symbol.GroupSymbol;
public class GroupsUsedByElementsVisitor {
/**
* Helper to quickly get the groups from obj in the elements collection
* @param obj Language object
* @param elements Collection to collect groups in
*/
public static final void getGroups(LanguageObject obj, Collection<GroupSymbol> groups) {
Collection<ElementSymbol> elements = ElementCollectorVisitor.getElements(obj, true);
for (ElementSymbol elementSymbol : elements) {
if (elementSymbol.getGroupSymbol() != null) {
groups.add(elementSymbol.getGroupSymbol());
}
}
}
/**
* Helper to quickly get the groups from obj in a collection. Duplicates
* are removed.
* @param obj Language object
* @return Collection of {@link org.teiid.query.sql.symbol.GroupSymbol}
*/
public static final Set<GroupSymbol> getGroups(LanguageObject obj) {
Set<GroupSymbol> groups = new LinkedHashSet<GroupSymbol>();
getGroups(obj, groups);
return groups;
}
public static Set<GroupSymbol> getGroups(Collection<? extends LanguageObject> objects) {
Set<GroupSymbol> groups = new LinkedHashSet<GroupSymbol>();
getGroups(objects, groups);
return groups;
}
public static void getGroups(Collection<? extends LanguageObject> objects, Set<GroupSymbol> groups) {
// Get groups from elements
for (LanguageObject languageObject : objects) {
if (languageObject instanceof ElementSymbol) {
ElementSymbol elem = (ElementSymbol) languageObject;
groups.add(elem.getGroupSymbol());
} else {
GroupsUsedByElementsVisitor.getGroups(languageObject, groups);
}
}
}
}