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Attributes.java

package gov.nasa.arc.ase.util.graph;

import java.util.Hashtable;
import java.util.Enumeration;
import java.util.StringTokenizer;

public class Attributes {
  private Hashtable ht;

  public Attributes() {
    ht = new Hashtable();
  }  
  public Attributes(Attributes a) {
    ht = new Hashtable();

    for(Enumeration e = a.ht.keys(); e.hasMoreElements(); ) {
      Object key = e.nextElement();
      ht.put(key, a.ht.get(key));
    }
  }  
  public Attributes(String s) {
    ht = new Hashtable();
    
    if(s.equals("-")) return;

    StringTokenizer st = new StringTokenizer(s, ",");
    while(st.hasMoreTokens()) {
      String e = st.nextToken();

      int idx = e.indexOf("=");

      String key;
      String value;

      if(idx == -1) {
    key = e;
    value = "";
      } else {
    key = e.substring(0, idx);
    value = e.substring(idx+1);
      }

      ht.put(key, value);
    }
  }  
  public boolean getBoolean(String name) {
    return ht.get(name) != null;
  }  
  public int getInt(String name) {
    Object o = ht.get(name);

    if(o == null) return 0;
    try {
      return Integer.parseInt((String)o);
    } catch(NumberFormatException e) {
      return 0;
    }
  }  
  public String getString(String name) {
    return ((String)ht.get(name));
  }  
  public void setBoolean(String name, boolean value) {
    if(value)
      ht.put(name, "");
    else
      ht.remove(name);
  }  
  public void setInt(String name, int value) {
    ht.put(name, Integer.toString(value));
  }  
  public void setString(String name, String value) {
    ht.put(name, value);
  }  
  public String toString() {
    if(ht.size() == 0) return "-";

    StringBuffer sb = new StringBuffer();
    for(Enumeration e = ht.keys(); e.hasMoreElements(); ) {
      Object key = e.nextElement();
      Object value = (String)ht.get(key);

      sb.append(key);
      if(!value.equals("")) {
    sb.append('=');
    sb.append(value);
      }
      if(e.hasMoreElements()) sb.append(',');
    }
    return sb.toString();
  }  
  public void unset(String name) {
    ht.remove(name);
  }  
}

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