/*
* 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.optimizer.relational.plantree;
import java.util.LinkedList;
import java.util.List;
/**
* This class is no longer really an editor. Those methods have been moved over to PlanNode.
* TODO: rename NodeFinder or merge completely with PlanNode
*/
public final class NodeEditor {
// Can't construct
private NodeEditor() {
}
/**
* all of child's children become children of parent
*/
public static final void removeChildNode(PlanNode parent, PlanNode child) {
if (child.getChildCount() == 0) {
parent.removeChild(child);
} else if (child.getChildCount() == 1){
PlanNode grandChild = child.getFirstChild();
parent.replaceChild(child, grandChild);
} else {
throw new AssertionError("Cannot promote a multinode child"); //$NON-NLS-1$
}
}
public static final PlanNode findNodePreOrder(PlanNode root, int types) {
return findNodePreOrder(root, types, NodeConstants.Types.NO_TYPE);
}
public static final PlanNode findNodePreOrder(PlanNode root, int types, int stopTypes) {
if (root == null) {
return null;
}
if((types & root.getType()) == root.getType()) {
return root;
} else if((stopTypes & root.getType()) == root.getType()) {
return null;
} else if(root.getChildCount() > 0) {
for (PlanNode child : root.getChildren()) {
PlanNode found = findNodePreOrder(child, types, stopTypes);
if(found != null) {
return found;
}
}
}
return null;
}
public static final PlanNode findParent(PlanNode root,
int types) {
return findParent(root, types, NodeConstants.Types.NO_TYPE);
}
/**
* Return the first parent node of the given type stopping at the given nodes.
* The matching will start at the parent of the node passed in.
* @param root
* @param type
* @param stopTypes
* @return the matching parent, or null one is not found
*/
public static final PlanNode findParent(PlanNode root,
int types,
int stopTypes) {
while (root != null && root.getParent() != null) {
root = root.getParent();
if ((types & root.getType()) == root.getType()) {
return root;
}
if ((stopTypes & root.getType()) == root.getType()) {
return null;
}
}
return null;
}
public static final List<PlanNode> findAllNodes(PlanNode root, int types) {
LinkedList<PlanNode> nodes = new LinkedList<PlanNode>();
findAllNodesHelper(root, types, nodes, NodeConstants.Types.NO_TYPE);
return nodes;
}
/**
* Find all nodes of a type, starting at the root of a tree or subtree of
* PlanNodes and searching downward, but not searching past nodes of type equal
* to stopType.
* @param root the top node of the subtree, the point at which searching begins
* @param types the types of the node to search for
* @param stopTypes type of nodes not to search past
* @return Collection of found PlanNodes
* @since 4.2
*/
public static final List<PlanNode> findAllNodes(PlanNode root, int types, int stopTypes) {
LinkedList<PlanNode> nodes = new LinkedList<PlanNode>();
findAllNodesHelper(root, types, nodes, stopTypes);
return nodes;
}
private static final void findAllNodesHelper(PlanNode node, int types, List<PlanNode> foundNodes, int stopTypes) {
if((node.getType() & types) == node.getType()) {
foundNodes.add(node);
}
if(node.getChildCount() > 0 && (stopTypes == NodeConstants.Types.NO_TYPE || (stopTypes & node.getType()) != node.getType() ) ) {
for (PlanNode child : node.getChildren()) {
findAllNodesHelper(child, types, foundNodes, stopTypes);
}
}
}
}