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Class weka.core.FastVector
java.lang.Object
|
+----weka.core.FastVector
- public class FastVector
- extends java.lang.Object
- implements Copyable, java.io.Serializable
Implements a fast vector class without synchronized
methods. Replaces java.util.Vector. (Synchronized methods tend to
be slow.)
- Version:
- $Revision: 1.7 $
- Author:
- Eibe Frank (eibe@cs.waikato.ac.nz)
FastVector.FastVectorEnumeration- Class for enumerating the vector's elements.
FastVector()
- Constructs an empty vector with initial
capacity zero.
FastVector(int)
- Constructs a vector with the given capacity.
FastVector(int, int, double)
- Constructs a vector with the given capacity, capacity
increment and capacity mulitplier.
addElement(Object)
- Adds an element to this vector.
appendElements(FastVector)
- Appends all elements of the supplied vector to this vector.
capacity()
- Returns the capacity of the vector.
copy()
- Produces a shallow copy of this vector.
copyElements()
- Clones the vector and shallow copies all its elements.
elementAt(int)
- Returns the element at the given position.
elements()
- Returns an enumeration of this vector.
elements(int)
- Returns an enumeration of this vector, skipping the
element with the given index.
firstElement()
- Returns the first element of the vector.
indexOf(Object)
- Searches for the first occurence of the given argument,
testing for equality using the equals method.
insertElementAt(Object, int)
- Inserts an element at the given position.
lastElement()
- Returns the last element of the vector.
removeAllElements()
- Removes all components from this vector and sets its
size to zero.
removeElementAt(int)
- Deletes an element from this vector.
setCapacity(int)
- Sets the vector's capacity to the given value.
setElementAt(Object, int)
- Sets the element at the given index.
size()
- Returns the vector's current size.
swap(int, int)
- Swaps two elements in the vector.
toArray()
- Returns all the elements of this vector as an array
trimToSize()
- Sets the vector's capacity to its size.
FastVector
public FastVector()
Constructs an empty vector with initial
capacity zero.
FastVector
public FastVector(int capacity)
Constructs a vector with the given capacity.
- Parameters:
capacity
- the vector's initial capacity
FastVector
public FastVector(int capacity,
int capIncrement,
double capMultiplier)
Constructs a vector with the given capacity, capacity
increment and capacity mulitplier.
- Parameters:
capacity
- the vector's initial capacity
addElement
public final void addElement(java.lang.Object element)
Adds an element to this vector. Increases its
capacity if its not large enough.
- Parameters:
element
- the element to add
capacity
public final int capacity()
Returns the capacity of the vector.
- Returns:
- the capacity of the vector
copy
public final java.lang.Object copy()
Produces a shallow copy of this vector.
- Returns:
- the new vector
copyElements
public final java.lang.Object copyElements()
Clones the vector and shallow copies all its elements.
The elements have to implement the Copyable interface.
- Returns:
- the new vector
elementAt
public final java.lang.Object elementAt(int index)
Returns the element at the given position.
- Parameters:
index
- the element's index
- Returns:
- the element with the given index
elements
public final java.util.Enumeration elements()
Returns an enumeration of this vector.
- Returns:
- an enumeration of this vector
elements
public final java.util.Enumeration elements(int index)
Returns an enumeration of this vector, skipping the
element with the given index.
- Parameters:
index
- the element to skip
- Returns:
- an enumeration of this vector
firstElement
public final java.lang.Object firstElement()
Returns the first element of the vector.
- Returns:
- the first element of the vector
indexOf
public final int indexOf(java.lang.Object element)
Searches for the first occurence of the given argument,
testing for equality using the equals method.
- Parameters:
element
- the element to be found
- Returns:
- the index of the first occurrence of the argument
in this vector; returns -1 if the object is not found
insertElementAt
public final void insertElementAt(java.lang.Object element,
int index)
Inserts an element at the given position.
- Parameters:
element
- the element to be inserted
index
- the element's index
lastElement
public final java.lang.Object lastElement()
Returns the last element of the vector.
- Returns:
- the last element of the vector
removeElementAt
public final void removeElementAt(int index)
Deletes an element from this vector.
- Parameters:
index
- the index of the element to be deleted
removeAllElements
public final void removeAllElements()
Removes all components from this vector and sets its
size to zero.
appendElements
public final void appendElements(FastVector toAppend)
Appends all elements of the supplied vector to this vector.
- Parameters:
toAppend
- the FastVector containing elements to append.
toArray
public final java.lang.Object[] toArray()
Returns all the elements of this vector as an array
- Parameters:
an
- array containing all the elements of this vector
setCapacity
public final void setCapacity(int capacity)
Sets the vector's capacity to the given value.
- Parameters:
capacity
- the new capacity
setElementAt
public final void setElementAt(java.lang.Object element,
int index)
Sets the element at the given index.
- Parameters:
element
- the element to be put into the vector
index
- the index at which the element is to be placed
size
public final int size()
Returns the vector's current size.
- Returns:
- the vector's current size
swap
public final void swap(int first,
int second)
Swaps two elements in the vector.
- Parameters:
first
- index of the first element
second
- index of the second element
trimToSize
public final void trimToSize()
Sets the vector's capacity to its size.
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