AbstractEdge.java

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package aud.graph;
 
import aud.util.GraphvizDecorable;
import aud.util.GraphvizDecorator;
 
public abstract class AbstractEdge
  implements Comparable<AbstractEdge>, GraphvizDecorable {
 
  AbstractGraph<? extends AbstractNode,? extends AbstractEdge> graph_ = null;
  AbstractNode  src_ = null;
  AbstractNode  dst_ = null;
 
  public abstract AbstractEdge create();
 
  public AbstractGraph<? extends AbstractNode,? extends AbstractEdge> graph() {
      return graph_;
  }
  public AbstractNode source() { return src_; }
  public AbstractNode destination() { return dst_; }
 
  public boolean hasWeight() { return !Double.isNaN(getWeight()); }
  public double getWeight() { return Double.NaN; }
  public void setWeight(double w) {
    throw new UnsupportedOperationException("'setWeight' undefined");
  }
 
  public String getLabel() {
    if (hasWeight()) {
      double w=getWeight();
      if (w==Math.floor(w)) // missing proper sprintf, Java's formatting sucks!
        return ""+((int) getWeight());
      else
        return ""+w;
    }
    else
      return null;
 
    //return hasWeight() ? ""+getWeight() : (String) null;
  }
 
  @Override public GraphvizDecorator getDecorator() {
    return graph_.getDecorator();
  }
 
  @Override public String toString() {
    String text=getLabel();
    return src_.toString()+
      (graph_.isDirected() ? " ->" : " --")+
      (text!=null ? "["+text+"] " : " ")+
      dst_.toString();
  }
 
  @Override public int compareTo(AbstractEdge other) {
    if (graph_!=other.graph_)
      throw new UnsupportedOperationException();
    int c=src_.compareTo(other.src_);
    return c!=0 ? c : dst_.compareTo(other.dst_);
  }
  @Override public boolean equals(Object other) {
    return compareTo((AbstractEdge) other)==0;
  }
}