| /* ==================================================================== |
| 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.poi.xdgf.usermodel.shape; |
| |
| import java.awt.geom.AffineTransform; |
| |
| import org.apache.poi.xdgf.usermodel.XDGFShape; |
| |
| /** |
| * Used to iterate through shapes |
| * |
| * To change the behavior of a particular visitor, you can override either |
| * accept() or getAcceptor() [preferred] |
| * |
| * If accept() or visit() throw StopVisitingThisBranch, the iteration will not |
| * visit subshapes of the shape. |
| */ |
| public abstract class ShapeVisitor { |
| |
| protected ShapeVisitorAcceptor _acceptor; |
| |
| public ShapeVisitor() { |
| _acceptor = getAcceptor(); |
| } |
| |
| /** |
| * Is only called on construction of the visitor, allows |
| * mixing visitors and acceptors |
| */ |
| protected ShapeVisitorAcceptor getAcceptor() { |
| return new ShapeVisitorAcceptor() { |
| @Override |
| public boolean accept(XDGFShape shape) { |
| return !shape.isDeleted(); |
| } |
| }; |
| } |
| |
| public void setAcceptor(ShapeVisitorAcceptor acceptor) { |
| _acceptor = acceptor; |
| } |
| |
| public boolean accept(XDGFShape shape) { |
| return _acceptor.accept(shape); |
| } |
| |
| /** |
| * @param shape |
| * Current shape |
| * @param globalTransform |
| * A transform that can convert the shapes points to global |
| * coordinates |
| * @param level |
| * Level in the tree (0 is topmost, 1 is next level... |
| */ |
| public abstract void visit(XDGFShape shape, |
| AffineTransform globalTransform, int level); |
| |
| } |