| /**************************************************************** |
| * Licensed to the Apache Software Foundation (ASF) under one * |
| * or more contributor license agreements. See the NOTICE file * |
| * distributed with this work for additional information * |
| * regarding copyright ownership. The ASF licenses this file * |
| * to you under the Apache License, Version 2.0 (the * |
| * "License"); you may not use this file except in compliance * |
| * with the License. You may obtain a copy of the License at * |
| * * |
| * http://www.apache.org/licenses/LICENSE-2.0 * |
| * * |
| * Unless required by applicable law or agreed to in writing, * |
| * software distributed under the License is distributed on an * |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
| * KIND, either express or implied. See the License for the * |
| * specific language governing permissions and limitations * |
| * under the License. * |
| ****************************************************************/ |
| package org.apache.jsieve.util; |
| |
| import org.apache.jsieve.exception.SieveException; |
| import org.apache.jsieve.parser.generated.ASTargument; |
| import org.apache.jsieve.parser.generated.ASTarguments; |
| import org.apache.jsieve.parser.generated.ASTblock; |
| import org.apache.jsieve.parser.generated.ASTcommand; |
| import org.apache.jsieve.parser.generated.ASTcommands; |
| import org.apache.jsieve.parser.generated.ASTstart; |
| import org.apache.jsieve.parser.generated.ASTstring; |
| import org.apache.jsieve.parser.generated.ASTstring_list; |
| import org.apache.jsieve.parser.generated.ASTtest; |
| import org.apache.jsieve.parser.generated.ASTtest_list; |
| import org.apache.jsieve.parser.generated.Node; |
| import org.apache.jsieve.parser.generated.SieveParserVisitor; |
| import org.apache.jsieve.parser.generated.SimpleNode; |
| |
| /** |
| * Traverses nodes. |
| * Once instance can be safely shared between threads. |
| */ |
| public class NodeTraverser { |
| |
| /** |
| * Traverses the tree structure rooted at the given node. |
| * The nodes contained are reported to the handler. |
| * @param root not null |
| * @param handler not null |
| * @throws SieveException when traversal fails |
| * @throws HaltTraversalException when traversal is halted by handler |
| */ |
| public void traverse(final NodeHandler handler, final Node root) throws SieveException { |
| final TraversalWorker worker = new TraversalWorker(handler); |
| handler.start(); |
| root.jjtAccept(worker, null); |
| handler.end(); |
| } |
| |
| /** |
| * Traverses the tree structure rooted at the given node. |
| * The nodes contained are reported to the handler. |
| * @param root not null |
| * @param handler not null |
| * @throws SieveException when traversal fails |
| * @throws HaltTraversalException when traversal is halted by handler |
| */ |
| public void traverse(final SieveHandler handler, final Node root) throws SieveException { |
| traverse(new NodeToSieveAdapter(handler), root); |
| } |
| |
| |
| /** |
| * <p>Traverses a nodal tree structure. |
| * An inner worker: |
| * </p> |
| * <ul> |
| * <li>Allows a more fluent public API</li> |
| * <li>Isolated the monotheaded code</li> |
| * </ul> |
| */ |
| private static final class TraversalWorker implements SieveParserVisitor { |
| |
| private final NodeHandler handler; |
| |
| /** |
| * Constructs a traversal worker. |
| * @param handler not null |
| */ |
| public TraversalWorker(final NodeHandler handler) { |
| super(); |
| this.handler = handler; |
| } |
| |
| public Object visit(SimpleNode node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTstart node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTcommands node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTcommand node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTblock node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTarguments node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTargument node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTtest node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTtest_list node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTstring node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| |
| public Object visit(ASTstring_list node, Object data) throws SieveException { |
| handler.start(node); |
| node.childrenAccept(this, null); |
| handler.end(node); |
| return null; |
| } |
| } |
| } |