jsubnode.java

一个JAVA编写的简单编译器

package ast;


public abstract class JSubNode implements IJSubNode {
  protected IJSubNode parent;
  protected java.util.Vector children;

  public JSubNode() {
    children = new java.util.Vector (2, 2);
  }
  public JSubNode(IJSubNode n) {
    children = new java.util.Vector (2, 2);
    children.addElement (n);
    n.setParent (this);
  }

  public void setParent(IJSubNode n) { 
    parent = n; 
  }
  
  public IJSubNode getParent() { 
    return parent; 
  }

  public void addChild(IJSubNode n) {
    children.addElement (n);
  }

  public IJSubNode getChild(int i) {
    return (IJSubNode)children.elementAt (i);
  }

  public int getNumChildren() {
    return children.size ();
  }
  
  public java.util.Enumeration elements () {
    return children.elements ();
  }

  public String toString(String prefix) { 
    return prefix + toString(); 
  }

 public int getDepth () {
    int depth = 0;
    for (int i = 0; i < children.size(); i++) {
      IJSubNode n = (IJSubNode)children.elementAt(i);
      int ndepth = n.getDepth() + 1; 
      if (depth < ndepth)
        depth = ndepth;
    }
    return depth;
  }

 /**
 * display with insert. 
 * this may be transacted in this class.
 * 
 * prefix that String to insert that display.
 */ 
  public void dump(String prefix) {
    System.out.println(prefix + toString());
    for (int i = 0; i < children.size(); ++i) {
      IJSubNode n = (IJSubNode)children.elementAt(i);
      n.dump(prefix + "  ");
    }
  }
 /**
 * XML-display.
 * the XML-display may be transacted in that class. 
 * they need detail of Sub-class only about unified XML-Type
 * Callback (getXMLType ().
 * 
 * @param p that display current for print as the case: println
 * @param prefix that String to the insert of the display
 */ 
  public void genXML (java.io.PrintStream p, String prefix) {
    p.println (prefix + "<" + getXMLType () + ">");
    for (int i = 0; i < children.size(); ++i) {
      IJSubNode n = (IJSubNode)children.elementAt(i);
      n.genXML (p, prefix + "  ");
    }
    p.println (prefix + "</" + getXMLType () + ">");
  }  

}