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public abstract void accept(ShapeVisitor visitor);

package com.example.shapeditor.model; import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; eclipse gef tutorial

package com.example.shapeditor.parts; import org.eclipse.draw2d. ; import org.eclipse.gef. ; import org.eclipse.gef.editparts.AbstractGraphicalEditPart; import com.example.shapeditor.figures.RectangleFigure; import com.example.shapeditor.model.Shape; public abstract void accept(ShapeVisitor visitor)

org.eclipse.core.runtime org.eclipse.ui org.eclipse.draw2d org.eclipse.gef org.eclipse.jface org.eclipse.swt org.eclipse.ui.ide Define the data structure. eclipse gef tutorial