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## org.biojavax.ga.util
Class WeightedSet

    java.lang.Object
      java.util.AbstractCollection<E>
          java.util.AbstractSet
              org.biojavax.ga.util.WeightedSet

All Implemented Interfaces:
  Serializable, Iterable, Collection, Set

    public class WeightedSet

extends AbstractSet
implements Serializable

Inspred by the BioJava Distribution objects the WeightedSet is a map from a Key to a Weight. Unlike Distributions the Keys do not have to be Symbols. In the GA package the WeightedMap is useful for sampling Organisms according to their fitness.

When Symbols are added or their weights are set then the weights are internally normalized to 1

Since:
  1.5
Version:
  1.0
Author:
  Mark Schreiber
See Also:
  Serialized Form

Constructor Summary
`WeightedSet()`

Method Summary
`boolean` | `add(Object o)` Adds a new `Object` with a weight of zero.
`boolean` | `addAll(Collection c)`
`Map` | `asMap()` Converts the Set to a map from key `Objects` to `Double` weights.
`void` | `clear()`
`boolean` | `contains(Object o)`
`boolean` | `containsAll(Collection c)`
`protected double` | `getTotalWeight()` The total weight that has been added to this Set.
`double` | `getWeight(Object o)` Determines the normalized weight for `o`
`boolean` | `isEmpty()`
`Iterator` | `iterator()` Returns an unmodifiable iterator over the keys of the set.
`boolean` | `remove(Object o)`
`boolean` | `retainAll(Collection c)`
`Object` | `sample()` Randomly samples an `Object` from the `Set` according to its weight.
`void` | `setWeight(Object o, double w)` Sets the weight of an `Object`.
`int` | `size()`
`Object[]` | `toArray()`

Methods inherited from class java.util.AbstractSet
`equals, hashCode, removeAll`

Methods inherited from class java.util.AbstractCollection
`toArray, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.Set
`toArray`

Constructor Detail

### WeightedSet

    public WeightedSet()

Method Detail

### asMap

    public Map asMap()

  Converts the Set to a map from key `Objects` to `Double` weights.

  Returns:
    a Map with all the key-weight mappings. Weights are not normalized in this map.

### sample

    public Object sample()

  Randomly samples an `Object` from the `Set` according to its weight.

  Returns:
    the Object sampled.

### getWeight

    public double getWeight(Object o)
                     throws NoSuchElementException

  Determines the normalized weight for `o`

  Parameters:
    `o` - the `Object` you want to know the weight of
  Returns:
    the normalized weight
  Throws:
    `NoSuchElementException` - if `o` is not found in this set

### getTotalWeight

    protected double getTotalWeight()

  The total weight that has been added to this Set.

  Returns:
    the total weight (the value that can be used for normalizing)

### setWeight

    public void setWeight(Object o,
                          double w)

  Sets the weight of an `Object`. If the `Object` is not in this `Set` then it is added.

  Parameters:
    `o` - the `Object`
    `w` - the weight.
  Throws:
    `IllegalArgumentException` - if `w` is < 0.0

### contains

    public boolean contains(Object o)

  Specified by:
    `contains` in interface `Collection`
  Specified by:
    `contains` in interface `Set`
  Overrides:
    `contains` in class `AbstractCollection`

### remove

    public boolean remove(Object o)

  Specified by:
    `remove` in interface `Collection`
  Specified by:
    `remove` in interface `Set`
  Overrides:
    `remove` in class `AbstractCollection`

### isEmpty

    public boolean isEmpty()

  Specified by:
    `isEmpty` in interface `Collection`
  Specified by:
    `isEmpty` in interface `Set`
  Overrides:
    `isEmpty` in class `AbstractCollection`

### retainAll

    public boolean retainAll(Collection c)

  Specified by:
    `retainAll` in interface `Collection`
  Specified by:
    `retainAll` in interface `Set`
  Overrides:
    `retainAll` in class `AbstractCollection`

### add

    public boolean add(Object o)

  Adds a new `Object` with a weight of zero. Equivalent to setWeight(o, 0.0);

  Specified by:
    `add` in interface `Collection`
  Specified by:
    `add` in interface `Set`
  Overrides:
    `add` in class `AbstractCollection`
  Parameters:
    `o` - the object to add.
  Returns:
    true if this Object has not been added before.

### size

    public int size()

  Specified by:
    `size` in interface `Collection`
  Specified by:
    `size` in interface `Set`
  Specified by:
    `size` in class `AbstractCollection`

### containsAll

    public boolean containsAll(Collection c)

  Specified by:
    `containsAll` in interface `Collection`
  Specified by:
    `containsAll` in interface `Set`
  Overrides:
    `containsAll` in class `AbstractCollection`

### toArray

    public Object[] toArray()

  Specified by:
    `toArray` in interface `Collection`
  Specified by:
    `toArray` in interface `Set`
  Overrides:
    `toArray` in class `AbstractCollection`

### clear

    public void clear()

  Specified by:
    `clear` in interface `Collection`
  Specified by:
    `clear` in interface `Set`
  Overrides:
    `clear` in class `AbstractCollection`

### iterator

    public Iterator iterator()

  Returns an unmodifiable iterator over the keys of the set.

  Specified by:
    `iterator` in interface `Iterable`
  Specified by:
    `iterator` in interface `Collection`
  Specified by:
    `iterator` in interface `Set`
  Specified by:
    `iterator` in class `AbstractCollection`
  Returns:
    an Iterator

### addAll

    public boolean addAll(Collection c)

  Specified by:
    `addAll` in interface `Collection`
  Specified by:
    `addAll` in interface `Set`
  Overrides:
    `addAll` in class `AbstractCollection`

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