edu.stanford.nlp.stats
Class AbstractCounter<E>

java.lang.Object
  edu.stanford.nlp.stats.AbstractCounter<E>

All Implemented Interfaces:

Counter<E>

Direct Known Subclasses:

IntCounter

public abstract class AbstractCounter<E>
extends Object
implements Counter<E>

Default implementations of all the convenience methods provided by Counter.

Author:

dramage

Constructor Summary

AbstractCounter()

Method Summary

void	addAll(Counter<E> counter) Adds the counts in the given Counter to the counts in this Counter.
double	decrementCount(E key) Decrements the count for this key by 1.0.
double	decrementCount(E key, double amount) Decrements the count for this key by the given value.
double	incrementCount(E key) Increments the count for this key by 1.0.
double	incrementCount(E key, double amount) Increments the count for the given key by the given value.
double	logIncrementCount(E key, double amount) Increments the count stored in log space for this key by the given log-transformed value.

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.stanford.nlp.stats.Counter

clear, containsKey, defaultReturnValue, entrySet, getCount, getFactory, keySet, remove, setCount, setDefaultReturnValue, size, totalCount, values

Constructor Detail

AbstractCounter

public AbstractCounter()

Method Detail

logIncrementCount

public double logIncrementCount(E key,
                                double amount)

Description copied from interface: Counter

Increments the count stored in log space for this key by the given log-transformed value. If the current count for the key is v1, and you call logIncrementCount with a value of v2, then the new value will be log(e^v1 + e^v2). If the key hasn't been seen before, it is assumed to have count Double.NEGATIVE_INFINITY, and thus this method will set its count to the given amount. Note that this is true regardless of the setting of defaultReturnValue. To set a count to a specifc value instead of incrementing it, you need to first take the log yourself and then to call Counter.setCount(Object,double).

Specified by:

logIncrementCount in interface Counter<E>

Parameters:

key - The key to increment

amount - The amount to increment it by, in log space

Returns:

The value associated with they key, post-increment, in log space

incrementCount

public double incrementCount(E key,
                             double amount)

Description copied from interface: Counter

Increments the count for the given key by the given value. If the key hasn't been seen before, it is assumed to have count 0.0, and thus this method will set its count to the given amount. Note that this is true regardless of the setting of defaultReturnValue. Negative increments are equivalent to calling decrementCount. To more conveniently increment the count by 1.0, use Counter.incrementCount(Object). To set a count to a specifc value instead of incrementing it, use Counter.setCount(Object,double).

Specified by:

incrementCount in interface Counter<E>

Parameters:

key - The key to increment

amount - The amount to increment it by

Returns:

The value associated with they key, post-increment.

incrementCount

public double incrementCount(E key)

Description copied from interface: Counter

Increments the count for this key by 1.0. If the key hasn't been seen before, it is assumed to have count 0.0, and thus this method will set its count to 1.0. Note that this is true regardless of the setting of defaultReturnValue. To increment the count by a value other than 1.0, use Counter.incrementCount(Object,double). To set a count to a specifc value instead of incrementing it, use Counter.setCount(Object,double).

Specified by:

incrementCount in interface Counter<E>

Parameters:

key - The key to increment by 1.0

Returns:

The value associated with they key, post-increment.

decrementCount

public double decrementCount(E key,
                             double amount)

Description copied from interface: Counter

Decrements the count for this key by the given value. If the key hasn't been seen before, it is assumed to have count 0.0, and thus this method will set its count to the negative of the given amount. Note that this is true regardless of the setting of defaultReturnValue. Negative increments are equivalent to calling incrementCount. To more conviently decrement the count by 1.0, use Counter.decrementCount(Object). To set a count to a specifc value instead of decrementing it, use Counter.setCount(Object,double).

Specified by:

decrementCount in interface Counter<E>

Parameters:

key - The key to decrement

amount - The amount to decrement it by

Returns:

The value associated with they key, post-decrement.

decrementCount

public double decrementCount(E key)

Description copied from interface: Counter

Decrements the count for this key by 1.0. If the key hasn't been seen before, it is assumed to have count 0.0, and thus this method will set its count to -1.0. Note that this is true regardless of the setting of defaultReturnValue. To decrement the count by a value other than 1.0, use Counter.decrementCount(Object,double). To set a count to a specifc value instead of decrementing it, use Counter.setCount(Object,double).

Specified by:

decrementCount in interface Counter<E>

Parameters:

key - The key to decrement by 1.0

Returns:

The value of associated with they key, post-decrement.

addAll

public void addAll(Counter<E> counter)

Adds the counts in the given Counter to the counts in this Counter. This is identical in effect to calling Counters.addInPlace(this, counter).

Specified by:

addAll in interface Counter<E>

Parameters:

counter - The Counter whose counts will be added. For each key in counter, if it is not in this, then it will be added with value counter.getCount(key). Otherwise, it will have value this.getCount(key) + counter.getCount(key).