/*
* 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.navigator;
import java.util.Collection;
import java.util.List;
import java.util.RandomAccess;
import org.teiid.query.sql.LanguageObject;
import org.teiid.query.sql.LanguageVisitor;
/**
* @since 4.2
*/
public class AbstractNavigator extends LanguageVisitor {
private LanguageVisitor visitor;
public AbstractNavigator(LanguageVisitor visitor) {
this.visitor = visitor;
}
public LanguageVisitor getVisitor() {
return this.visitor;
}
protected void visitVisitor(LanguageObject obj) {
if(this.visitor.shouldAbort()) {
return;
}
obj.acceptVisitor(this.visitor);
}
protected void visitNode(LanguageObject obj) {
if(this.visitor.shouldAbort()) {
return;
}
if(obj != null) {
obj.acceptVisitor(this);
}
}
protected void visitNodes(Collection<? extends LanguageObject> nodes) {
if(this.visitor.shouldAbort() || nodes == null) {
return;
}
int size = nodes.size();
if (size > 0) {
if (nodes instanceof List<?> && nodes instanceof RandomAccess) {
List<? extends LanguageObject> list = (List<? extends LanguageObject>) nodes;
for (int i = 0; i < size; i++) {
visitNode(list.get(i));
}
return;
}
for (LanguageObject languageObject : nodes) {
visitNode(languageObject);
}
}
}
}