org.apache.poi.xdgf.usermodel.shape.ShapeVisitor Maven / Gradle / Ivy
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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);
}