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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 byte values.
*
* Created: Sun Nov 4 08:52:45 2001
*
* @author Eric D. Friedman
*/
public class TByteByteHashMap extends TByteHash implements Externalizable {
static final long serialVersionUID = 1L;
/** the values of the map */
protected transient byte[] _values;
/**
* Creates a new TByteByteHashMap instance with the default
* capacity and load factor.
*/
public TByteByteHashMap() {
super();
}
/**
* Creates a new TByteByteHashMap instance with a prime
* capacity equal to or greater than initialCapacity and
* with the default load factor.
*
* @param initialCapacity an int value
*/
public TByteByteHashMap(int initialCapacity) {
super(initialCapacity);
}
/**
* Creates a new TByteByteHashMap 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 TByteByteHashMap(int initialCapacity, float loadFactor) {
super(initialCapacity, loadFactor);
}
/**
* Creates a new TByteByteHashMap instance with the default
* capacity and load factor.
* @param strategy used to compute hash codes and to compare keys.
*/
public TByteByteHashMap(TByteHashingStrategy strategy) {
super(strategy);
}
/**
* Creates a new TByteByteHashMap 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 TByteByteHashMap(int initialCapacity, TByteHashingStrategy strategy) {
super(initialCapacity, strategy);
}
/**
* Creates a new TByteByteHashMap 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 TByteByteHashMap(int initialCapacity, float loadFactor, TByteHashingStrategy strategy) {
super(initialCapacity, loadFactor, strategy);
}
/**
* @return a deep clone of this collection
*/
public Object clone() {
TByteByteHashMap m = (TByteByteHashMap)super.clone();
m._values = (byte[])this._values.clone();
return m;
}
/**
* @return a TByteByteIterator with access to this map's keys and values
*/
public TByteByteIterator iterator() {
return new TByteByteIterator(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 byte[capacity];
return capacity;
}
/**
* Inserts a key/value pair into the map.
*
* @param key an byte value
* @param value an byte value
* @return the previous value associated with key,
* or (byte)0 if none was found.
*/
public byte put(byte key, byte value) {
byte previousState;
byte previous = (byte)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;
byte oldVals[] = _values;
byte oldStates[] = _states;
_set = new byte[newCapacity];
_values = new byte[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 byte get(byte key) {
int index = index(key);
return index < 0 ? (byte)0 : _values[index];
}
/**
* Empties the map.
*
*/
public void clear() {
super.clear();
byte[] keys = _set;
byte[] vals = _values;
byte[] states = _states;
for (int i = keys.length; i-- > 0;) {
keys[i] = (byte)0;
vals[i] = (byte)0;
states[i] = FREE;
}
}
/**
* Deletes a key/value pair from the map.
*
* @param key an byte value
* @return an byte value, or (byte)0 if no mapping for key exists
*/
public byte remove(byte key) {
byte prev = (byte)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 TByteByteHashMap)) {
return false;
}
TByteByteHashMap that = (TByteByteHashMap)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 TByteByteProcedure {
private int h = 0;
public int getHashCode() {
return h;
}
public final boolean execute(byte key, byte value) {
h += (_hashingStrategy.computeHashCode(key) ^ HashFunctions.hash(value));
return true;
}
}
private static final class EqProcedure implements TByteByteProcedure {
private final TByteByteHashMap _otherMap;
EqProcedure(TByteByteHashMap otherMap) {
_otherMap = otherMap;
}
public final boolean execute(byte key, byte value) {
int index = _otherMap.index(key);
if (index >= 0 && eq(value, _otherMap.get(key))) {
return true;
}
return false;
}
/**
* Compare two bytes for equality.
*/
private final boolean eq(byte v1, byte v2) {
return v1 == v2;
}
}
/**
* removes the mapping at index from the map.
*
* @param index an int value
*/
protected void removeAt(int index) {
_values[index] = (byte)0;
super.removeAt(index); // clear key, state; adjust size
}
/**
* Returns the values of the map.
*
* @return a Collection value
*/
public byte[] getValues() {
byte[] vals = new byte[size()];
byte[] 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 byte value
* @return a boolean value
*/
public boolean containsValue(byte val) {
byte[] states = _states;
byte[] 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 TByteProcedure value
* @return false if the loop over the values terminated because
* the procedure returned false for some value.
*/
public boolean forEachValue(TByteProcedure procedure) {
byte[] states = _states;
byte[] 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 TOByteByteProcedure value
* @return false if the loop over the entries terminated because
* the procedure returned false for some entry.
*/
public boolean forEachEntry(TByteByteProcedure procedure) {
byte[] states = _states;
byte[] keys = _set;
byte[] 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(TByteByteProcedure procedure) {
boolean modified = false;
byte[] states = _states;
byte[] keys = _set;
byte[] 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 TByteFunction value
*/
public void transformValues(TByteFunction function) {
byte[] states = _states;
byte[] 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, (byte)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, byte 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 byte adjustOrPutValue(final byte key, final byte adjust_amount, final byte put_amount ) {
int index = insertionIndex(key);
final boolean isNewMapping;
final byte 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();
byte val = in.readByte();
put(key, val);
}
}
} // TByteByteHashMap