sizevisitor.java

<设计模式-Java语言中的应用> 的源码

import java.util.Iterator;

public class SizeVisitor extends Visitor {
    private int size = 0;
    public int getSize() {
        return size;
    }
    public void visit(File file) {
        size += file.getSize();
    }
    public void visit(Directory directory) {
        Iterator it = directory.iterator();
        while (it.hasNext()) {
            Entry entry = (Entry)it.next();
            entry.accept(this);
        }
    }
}