src.it.unimi.dsi.fastutil.bytes.Byte2ObjectFunctions Maven / Gradle / Ivy
/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*
* Copyright (C) 2002-2013 Sebastiano Vigna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package it.unimi.dsi.fastutil.bytes;
/** A class providing static methods and objects that do useful things with type-specific functions.
*
* @see it.unimi.dsi.fastutil.Function
* @see java.util.Collections
*/
public class Byte2ObjectFunctions {
private Byte2ObjectFunctions() {}
/** An immutable class representing an empty type-specific function.
*
* This class may be useful to implement your own in case you subclass
* a type-specific function.
*/
public static class EmptyFunction extends AbstractByte2ObjectFunction implements java.io.Serializable, Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected EmptyFunction() {}
public V get( final byte k ) { return (null); }
public boolean containsKey( final byte k ) { return false; }
public V defaultReturnValue() { return (null); }
public void defaultReturnValue( final V defRetValue ) { throw new UnsupportedOperationException(); }
public V get( final Object k ) { return null; }
public int size() { return 0; }
public void clear() {}
private Object readResolve() { return EMPTY_FUNCTION; }
public Object clone() { return EMPTY_FUNCTION; }
}
/** An empty type-specific function (immutable). It is serializable and cloneable. */
@SuppressWarnings("rawtypes")
public static final EmptyFunction EMPTY_FUNCTION = new EmptyFunction();
/** An immutable class representing a type-specific singleton function.
*
* This class may be useful to implement your own in case you subclass
* a type-specific function.
*/
public static class Singleton extends AbstractByte2ObjectFunction implements java.io.Serializable, Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected final byte key;
protected final V value;
protected Singleton( final byte key, final V value ) {
this.key = key;
this.value = value;
}
public boolean containsKey( final byte k ) { return ( (key) == (k) ); }
public V get( final byte k ) { if ( ( (key) == (k) ) ) return value; return defRetValue; }
public int size() { return 1; }
public Object clone() { return this; }
}
/** Returns a type-specific immutable function containing only the specified pair. The returned function is serializable and cloneable.
*
* Note that albeit the returned function is immutable, its default return value may be changed.
*
* @param key the only key of the returned function.
* @param value the only value of the returned function.
* @return a type-specific immutable function containing just the pair <key,value>.
*/
public static Byte2ObjectFunction singleton( final byte key, V value ) {
return new Singleton ( key, value );
}
/** Returns a type-specific immutable function containing only the specified pair. The returned function is serializable and cloneable.
*
* Note that albeit the returned function is immutable, its default return value may be changed.
*
* @param key the only key of the returned function.
* @param value the only value of the returned function.
* @return a type-specific immutable function containing just the pair <key,value>.
*/
public static Byte2ObjectFunction singleton( final Byte key, final V value ) {
return new Singleton ( ((key).byteValue()), (value) );
}
/** A synchronized wrapper class for functions. */
public static class SynchronizedFunction extends AbstractByte2ObjectFunction implements java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final Byte2ObjectFunction function;
protected final Object sync;
protected SynchronizedFunction( final Byte2ObjectFunction f, final Object sync ) {
if ( f == null ) throw new NullPointerException();
this.function = f;
this.sync = sync;
}
protected SynchronizedFunction( final Byte2ObjectFunction f ) {
if ( f == null ) throw new NullPointerException();
this.function = f;
this.sync = this;
}
public int size() { synchronized( sync ) { return function.size(); } }
public boolean containsKey( final byte k ) { synchronized( sync ) { return function.containsKey( k ); } }
public V defaultReturnValue() { synchronized( sync ) { return function.defaultReturnValue(); } }
public void defaultReturnValue( final V defRetValue ) { synchronized( sync ) { function.defaultReturnValue( defRetValue ); } }
public V put( final byte k, final V v ) { synchronized( sync ) { return function.put( k, v ); } }
public void clear() { synchronized( sync ) { function.clear(); } }
public String toString() { synchronized( sync ) { return function.toString(); } }
public V put( final Byte k, final V v ) { synchronized( sync ) { return function.put( k, v ); } }
public V get( final Object k ) { synchronized( sync ) { return function.get( k ); } }
public V remove( final Object k ) { synchronized( sync ) { return function.remove( k ); } }
public V remove( final byte k ) { synchronized( sync ) { return function.remove( k ); } }
public V get( final byte k ) { synchronized( sync ) { return function.get( k ); } }
public boolean containsKey( final Object ok ) { synchronized( sync ) { return function.containsKey( ok ); } }
}
/** Returns a synchronized type-specific function backed by the given type-specific function.
*
* @param f the function to be wrapped in a synchronized function.
* @return a synchronized view of the specified function.
* @see java.util.Collections#synchronizedMap(java.util.Map)
*/
public static Byte2ObjectFunction synchronize( final Byte2ObjectFunction f ) { return new SynchronizedFunction ( f ); }
/** Returns a synchronized type-specific function backed by the given type-specific function, using an assigned object to synchronize.
*
* @param f the function to be wrapped in a synchronized function.
* @param sync an object that will be used to synchronize the access to the function.
* @return a synchronized view of the specified function.
* @see java.util.Collections#synchronizedMap(java.util.Map)
*/
public static Byte2ObjectFunction synchronize( final Byte2ObjectFunction f, final Object sync ) { return new SynchronizedFunction ( f, sync ); }
/** An unmodifiable wrapper class for functions. */
public static class UnmodifiableFunction extends AbstractByte2ObjectFunction implements java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final Byte2ObjectFunction function;
protected UnmodifiableFunction( final Byte2ObjectFunction f ) {
if ( f == null ) throw new NullPointerException();
this.function = f;
}
public int size() { return function.size(); }
public boolean containsKey( final byte k ) { return function.containsKey( k ); }
public V defaultReturnValue() { return function.defaultReturnValue(); }
public void defaultReturnValue( final V defRetValue ) { throw new UnsupportedOperationException(); }
public V put( final byte k, final V v ) { throw new UnsupportedOperationException(); }
public void clear() { throw new UnsupportedOperationException(); }
public String toString() { return function.toString(); }
public V remove( final byte k ) { throw new UnsupportedOperationException(); }
public V get( final byte k ) { return function.get( k ); }
public boolean containsKey( final Object ok ) { return function.containsKey( ok ); }
public V remove( final Object k ) { throw new UnsupportedOperationException(); }
public V get( final Object k ) { return function.get( k ); }
}
/** Returns an unmodifiable type-specific function backed by the given type-specific function.
*
* @param f the function to be wrapped in an unmodifiable function.
* @return an unmodifiable view of the specified function.
* @see java.util.Collections#unmodifiableMap(java.util.Map)
*/
public static Byte2ObjectFunction unmodifiable( final Byte2ObjectFunction f ) { return new UnmodifiableFunction ( f ); }
}