gnu.trove.TByteFloatHashMap Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of trove4j Show documentation
Show all versions of trove4j Show documentation
The Trove library provides high speed regular and primitive
collections for Java.
///////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2001, Eric D. Friedman All Rights Reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
///////////////////////////////////////////////////////////////////////////////
package gnu.trove;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Externalizable;
//////////////////////////////////////////////////
// THIS IS A GENERATED CLASS. DO NOT HAND EDIT! //
//////////////////////////////////////////////////
/**
* An open addressed Map implementation for byte keys and float values.
*
* Created: Sun Nov 4 08:52:45 2001
*
* @author Eric D. Friedman
*/
public class TByteFloatHashMap extends TByteHash implements Externalizable {
static final long serialVersionUID = 1L;
/** the values of the map */
protected transient float[] _values;
/**
* Creates a new TByteFloatHashMap instance with the default
* capacity and load factor.
*/
public TByteFloatHashMap() {
super();
}
/**
* Creates a new TByteFloatHashMap instance with a prime
* capacity equal to or greater than initialCapacity and
* with the default load factor.
*
* @param initialCapacity an int value
*/
public TByteFloatHashMap(int initialCapacity) {
super(initialCapacity);
}
/**
* Creates a new TByteFloatHashMap instance with a prime
* capacity equal to or greater than initialCapacity and
* with the specified load factor.
*
* @param initialCapacity an int value
* @param loadFactor a float value
*/
public TByteFloatHashMap(int initialCapacity, float loadFactor) {
super(initialCapacity, loadFactor);
}
/**
* Creates a new TByteFloatHashMap instance with the default
* capacity and load factor.
* @param strategy used to compute hash codes and to compare keys.
*/
public TByteFloatHashMap(TByteHashingStrategy strategy) {
super(strategy);
}
/**
* Creates a new TByteFloatHashMap instance whose capacity
* is the next highest prime above initialCapacity + 1
* unless that value is already prime.
*
* @param initialCapacity an int value
* @param strategy used to compute hash codes and to compare keys.
*/
public TByteFloatHashMap(int initialCapacity, TByteHashingStrategy strategy) {
super(initialCapacity, strategy);
}
/**
* Creates a new TByteFloatHashMap instance with a prime
* value at or near the specified capacity and load factor.
*
* @param initialCapacity used to find a prime capacity for the table.
* @param loadFactor used to calculate the threshold over which
* rehashing takes place.
* @param strategy used to compute hash codes and to compare keys.
*/
public TByteFloatHashMap(int initialCapacity, float loadFactor, TByteHashingStrategy strategy) {
super(initialCapacity, loadFactor, strategy);
}
/**
* @return a deep clone of this collection
*/
public Object clone() {
TByteFloatHashMap m = (TByteFloatHashMap)super.clone();
m._values = (float[])this._values.clone();
return m;
}
/**
* @return a TByteFloatIterator with access to this map's keys and values
*/
public TByteFloatIterator iterator() {
return new TByteFloatIterator(this);
}
/**
* initializes the hashtable to a prime capacity which is at least
* initialCapacity + 1.
*
* @param initialCapacity an int value
* @return the actual capacity chosen
*/
protected int setUp(int initialCapacity) {
int capacity;
capacity = super.setUp(initialCapacity);
_values = new float[capacity];
return capacity;
}
/**
* Inserts a key/value pair into the map.
*
* @param key an byte value
* @param value an float value
* @return the previous value associated with key,
* or (byte)0 if none was found.
*/
public float put(byte key, float value) {
byte previousState;
float previous = (float)0;
int index = insertionIndex(key);
boolean isNewMapping = true;
if (index < 0) {
index = -index -1;
previous = _values[index];
isNewMapping = false;
}
previousState = _states[index];
_set[index] = key;
_states[index] = FULL;
_values[index] = value;
if (isNewMapping) {
postInsertHook(previousState == FREE);
}
return previous;
}
/**
* rehashes the map to the new capacity.
*
* @param newCapacity an int value
*/
protected void rehash(int newCapacity) {
int oldCapacity = _set.length;
byte oldKeys[] = _set;
float oldVals[] = _values;
byte oldStates[] = _states;
_set = new byte[newCapacity];
_values = new float[newCapacity];
_states = new byte[newCapacity];
for (int i = oldCapacity; i-- > 0;) {
if(oldStates[i] == FULL) {
byte o = oldKeys[i];
int index = insertionIndex(o);
_set[index] = o;
_values[index] = oldVals[i];
_states[index] = FULL;
}
}
}
/**
* retrieves the value for key
*
* @param key an byte value
* @return the value of key or (byte)0 if no such mapping exists.
*/
public float get(byte key) {
int index = index(key);
return index < 0 ? (float)0 : _values[index];
}
/**
* Empties the map.
*
*/
public void clear() {
super.clear();
byte[] keys = _set;
float[] vals = _values;
byte[] states = _states;
for (int i = keys.length; i-- > 0;) {
keys[i] = (byte)0;
vals[i] = (float)0;
states[i] = FREE;
}
}
/**
* Deletes a key/value pair from the map.
*
* @param key an byte value
* @return an float value, or (byte)0 if no mapping for key exists
*/
public float remove(byte key) {
float prev = (float)0;
int index = index(key);
if (index >= 0) {
prev = _values[index];
removeAt(index); // clear key,state; adjust size
}
return prev;
}
/**
* Compares this map with another map for equality of their stored
* entries.
*
* @param other an Object value
* @return a boolean value
*/
public boolean equals(Object other) {
if (! (other instanceof TByteFloatHashMap)) {
return false;
}
TByteFloatHashMap that = (TByteFloatHashMap)other;
if (that.size() != this.size()) {
return false;
}
return forEachEntry(new EqProcedure(that));
}
public int hashCode() {
HashProcedure p = new HashProcedure();
forEachEntry(p);
return p.getHashCode();
}
private final class HashProcedure implements TByteFloatProcedure {
private int h = 0;
public int getHashCode() {
return h;
}
public final boolean execute(byte key, float value) {
h += (_hashingStrategy.computeHashCode(key) ^ HashFunctions.hash(value));
return true;
}
}
private static final class EqProcedure implements TByteFloatProcedure {
private final TByteFloatHashMap _otherMap;
EqProcedure(TByteFloatHashMap otherMap) {
_otherMap = otherMap;
}
public final boolean execute(byte key, float value) {
int index = _otherMap.index(key);
if (index >= 0 && eq(value, _otherMap.get(key))) {
return true;
}
return false;
}
/**
* Compare two floats for equality.
*/
private final boolean eq(float v1, float v2) {
return v1 == v2;
}
}
/**
* removes the mapping at index from the map.
*
* @param index an int value
*/
protected void removeAt(int index) {
_values[index] = (float)0;
super.removeAt(index); // clear key, state; adjust size
}
/**
* Returns the values of the map.
*
* @return a Collection value
*/
public float[] getValues() {
float[] vals = new float[size()];
float[] v = _values;
byte[] states = _states;
for (int i = v.length, j = 0; i-- > 0;) {
if (states[i] == FULL) {
vals[j++] = v[i];
}
}
return vals;
}
/**
* returns the keys of the map.
*
* @return a Set value
*/
public byte[] keys() {
byte[] keys = new byte[size()];
byte[] k = _set;
byte[] states = _states;
for (int i = k.length, j = 0; i-- > 0;) {
if (states[i] == FULL) {
keys[j++] = k[i];
}
}
return keys;
}
/**
* returns the keys of the map.
*
* @param a the array into which the elements of the list are to
* be stored, if it is big enough; otherwise, a new array of the
* same type is allocated for this purpose.
* @return a Set value
*/
public byte[] keys(byte[] a) {
int size = size();
if (a.length < size) {
a = (byte[]) java.lang.reflect.Array.newInstance(
a.getClass().getComponentType(), size);
}
byte[] k = (byte[]) _set;
for (int i = k.length, j = 0; i-- > 0;) {
if (k[i] != FREE && k[i] != REMOVED) {
a[j++] = k[i];
}
}
return a;
}
/**
* checks for the presence of val in the values of the map.
*
* @param val an float value
* @return a boolean value
*/
public boolean containsValue(float val) {
byte[] states = _states;
float[] vals = _values;
for (int i = vals.length; i-- > 0;) {
if (states[i] == FULL && val == vals[i]) {
return true;
}
}
return false;
}
/**
* checks for the present of key in the keys of the map.
*
* @param key an byte value
* @return a boolean value
*/
public boolean containsKey(byte key) {
return contains(key);
}
/**
* Executes procedure for each key in the map.
*
* @param procedure a TByteProcedure value
* @return false if the loop over the keys terminated because
* the procedure returned false for some key.
*/
public boolean forEachKey(TByteProcedure procedure) {
return forEach(procedure);
}
/**
* Executes procedure for each value in the map.
*
* @param procedure a TFloatProcedure value
* @return false if the loop over the values terminated because
* the procedure returned false for some value.
*/
public boolean forEachValue(TFloatProcedure procedure) {
byte[] states = _states;
float[] values = _values;
for (int i = values.length; i-- > 0;) {
if (states[i] == FULL && ! procedure.execute(values[i])) {
return false;
}
}
return true;
}
/**
* Executes procedure for each key/value entry in the
* map.
*
* @param procedure a TOByteFloatProcedure value
* @return false if the loop over the entries terminated because
* the procedure returned false for some entry.
*/
public boolean forEachEntry(TByteFloatProcedure procedure) {
byte[] states = _states;
byte[] keys = _set;
float[] values = _values;
for (int i = keys.length; i-- > 0;) {
if (states[i] == FULL && ! procedure.execute(keys[i],values[i])) {
return false;
}
}
return true;
}
/**
* Retains only those entries in the map for which the procedure
* returns a true value.
*
* @param procedure determines which entries to keep
* @return true if the map was modified.
*/
public boolean retainEntries(TByteFloatProcedure procedure) {
boolean modified = false;
byte[] states = _states;
byte[] keys = _set;
float[] values = _values;
// Temporarily disable compaction. This is a fix for bug #1738760
tempDisableAutoCompaction();
try {
for (int i = keys.length; i-- > 0;) {
if (states[i] == FULL && ! procedure.execute(keys[i],values[i])) {
removeAt(i);
modified = true;
}
}
}
finally {
reenableAutoCompaction(true);
}
return modified;
}
/**
* Transform the values in this map using function.
*
* @param function a TFloatFunction value
*/
public void transformValues(TFloatFunction function) {
byte[] states = _states;
float[] values = _values;
for (int i = values.length; i-- > 0;) {
if (states[i] == FULL) {
values[i] = function.execute(values[i]);
}
}
}
/**
* Increments the primitive value mapped to key by 1
*
* @param key the key of the value to increment
* @return true if a mapping was found and modified.
*/
public boolean increment(byte key) {
return adjustValue(key, (float)1);
}
/**
* Adjusts the primitive value mapped to key.
*
* @param key the key of the value to increment
* @param amount the amount to adjust the value by.
* @return true if a mapping was found and modified.
*/
public boolean adjustValue(byte key, float amount) {
int index = index(key);
if (index < 0) {
return false;
} else {
_values[index] += amount;
return true;
}
}
/**
* Adjusts the primitive value mapped to the key if the key is present in the map.
* Otherwise, the initial_value is put in the map.
*
* @param key the key of the value to increment
* @param adjust_amount the amount to adjust the value by
* @param put_amount the value put into the map if the key is not initial present
*
* @return the value present in the map after the adjustment or put operation
*
* @since 2.0b1
*/
public float adjustOrPutValue(final byte key, final float adjust_amount, final float put_amount ) {
int index = insertionIndex(key);
final boolean isNewMapping;
final float newValue;
if (index < 0) {
index = -index -1;
newValue = ( _values[index] += adjust_amount );
isNewMapping = false;
} else {
newValue = ( _values[index] = put_amount );
isNewMapping = true;
}
byte previousState = _states[index];
_set[index] = key;
_states[index] = FULL;
if ( isNewMapping ) {
postInsertHook(previousState == FREE);
}
return newValue;
}
public void writeExternal( ObjectOutput out ) throws IOException {
// VERSION
out.writeByte( 0 );
// NUMBER OF ENTRIES
out.writeInt( _size );
// ENTRIES
SerializationProcedure writeProcedure = new SerializationProcedure( out );
if (! forEachEntry(writeProcedure)) {
throw writeProcedure.exception;
}
}
public void readExternal( ObjectInput in )
throws IOException, ClassNotFoundException {
// VERSION
in.readByte();
// NUMBER OF ENTRIES
int size = in.readInt();
setUp( size );
// ENTRIES
while (size-- > 0) {
byte key = in.readByte();
float val = in.readFloat();
put(key, val);
}
}
} // TByteFloatHashMap