DoubleEnumeration

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gnu.java.util
Class DoubleEnumeration

java.lang.Object
  gnu.java.util.DoubleEnumeration

All Implemented Interfaces:: java.util.Enumeration

public class DoubleEnumeration
extends java.lang.Object
implements java.util.Enumeration

This is a helper class that combines two Enumerations. It returns the elements of the first Enumeration until it has no more elements and then returns the elements of the second Enumeration.
In the default case:

 doubleEnum = new DoubleEnumeration(enum1, enum2);
 while (doubleEnum.hasMoreElements()) {
    Object o = doubleEnum.nextElement();
    do_something(o);
 }

it calls hasMoreElements of the Enumerations as few times as possible. The references to the Enumerations are cleared as soon as they have no more elements to help garbage collecting.

Field Summary

private java.util.Enumeration e1
          The first enumeration.

private java.util.Enumeration e2
          The second enumeration.

private boolean hasChecked
          This is true, if it is sure that hasMore indicates wether there are more elements.

private boolean hasMore
          This is true as long as one of the enumerations has more elements.

Constructor Summary

DoubleEnumeration(java.util.Enumeration e1, java.util.Enumeration e2)
          Creates a new Enumeration combining the given two enumerations.

Method Summary

boolean hasMoreElements()
          Returns true, if at least one of the two enumerations has more elements.

java.lang.Object nextElement()
          Returns the next element.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

hasMore

private boolean hasMore

This is true as long as one of the enumerations has more elements. Only valid when hasChecked is true. Set in hasMoreElements()

hasChecked

private boolean hasChecked

This is true, if it is sure that hasMore indicates wether there are more elements. Set to true in hasMoreElements(). Set to false in getNextElement().

e1

private java.util.Enumeration e1

The first enumeration.

e2

private java.util.Enumeration e2

The second enumeration.

Constructor Detail