ariba.util.core
Class Holder<V>

java.lang.Object
  ariba.util.core.Holder<V>

public abstract class Holder<V>
extends java.lang.Object

Convenience class that makes it a little simpler to write a lazily evalated value.

Use as follows. Instead of writing:

    List<String> _list;
    public List<String> list() {
      if (_list == null) {
        _list = initialzeList();
      }
      return _list;
    }
    

You write:

    Holder<List<String>> _list = new Holder<List<String>>() {
        protected List<String> initialValue() { 
          return initializeList();
        }
    }
    

You then access the value by _list.get().indexOf("foo") etc.

Constructor Summary

Holder()

Method Summary

V	get() Returns the value held by this.

Methods inherited from class java.lang.Object

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

Constructor Detail

Holder

public Holder()

Method Detail

get

public V get()

Returns the value held by this.