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/*
* Copyright (C) 2002-2016 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 PACKAGE;
/** 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 FUNCTIONS {
private FUNCTIONS() {}
/** 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 KEY_VALUE_GENERIC extends ABSTRACT_FUNCTION KEY_VALUE_GENERIC implements java.io.Serializable, Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected EmptyFunction() {}
public VALUE_GENERIC_TYPE GET_VALUE( final KEY_TYPE k ) { return VALUE_NULL; }
public boolean containsKey( final KEY_TYPE k ) { return false; }
public VALUE_GENERIC_TYPE defaultReturnValue() { return VALUE_NULL; }
public void defaultReturnValue( final VALUE_GENERIC_TYPE defRetValue ) { throw new UnsupportedOperationException(); }
#if KEYS_PRIMITIVE
#if VALUES_PRIMITIVE
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
#endif
@Override
public VALUE_GENERIC_CLASS get( final Object k ) { return null; }
#endif
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. */
SUPPRESS_WARNINGS_KEY_VALUE_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 KEY_VALUE_GENERIC extends ABSTRACT_FUNCTION KEY_VALUE_GENERIC implements java.io.Serializable, Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected final KEY_GENERIC_TYPE key;
protected final VALUE_GENERIC_TYPE value;
protected Singleton( final KEY_GENERIC_TYPE key, final VALUE_GENERIC_TYPE value ) {
this.key = key;
this.value = value;
}
public boolean containsKey( final KEY_TYPE k ) { return KEY_EQUALS( key, k ); }
public VALUE_GENERIC_TYPE GET_VALUE( final KEY_TYPE k ) { if ( KEY_EQUALS( 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 KEY_VALUE_GENERIC FUNCTION KEY_VALUE_GENERIC singleton( final KEY_GENERIC_TYPE key, VALUE_GENERIC_TYPE value ) {
return new Singleton KEY_VALUE_GENERIC( key, value );
}
#if KEYS_PRIMITIVE || VALUES_PRIMITIVE
/** 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 KEY_VALUE_GENERIC FUNCTION KEY_VALUE_GENERIC singleton( final KEY_GENERIC_CLASS key, final VALUE_GENERIC_CLASS value ) {
return new Singleton KEY_VALUE_GENERIC( KEY_CLASS2TYPE( key ), VALUE_CLASS2TYPE( value ) );
}
#endif
/** A synchronized wrapper class for functions. */
public static class SynchronizedFunction KEY_VALUE_GENERIC extends ABSTRACT_FUNCTION KEY_VALUE_GENERIC implements java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final FUNCTION KEY_VALUE_GENERIC function;
protected final Object sync;
protected SynchronizedFunction( final FUNCTION KEY_VALUE_GENERIC f, final Object sync ) {
if ( f == null ) throw new NullPointerException();
this.function = f;
this.sync = sync;
}
protected SynchronizedFunction( final FUNCTION KEY_VALUE_GENERIC 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 KEY_TYPE k ) { synchronized( sync ) { return function.containsKey( k ); } }
public VALUE_GENERIC_TYPE defaultReturnValue() { synchronized( sync ) { return function.defaultReturnValue(); } }
public void defaultReturnValue( final VALUE_GENERIC_TYPE defRetValue ) { synchronized( sync ) { function.defaultReturnValue( defRetValue ); } }
public VALUE_GENERIC_TYPE put( final KEY_GENERIC_TYPE k, final VALUE_GENERIC_TYPE v ) { synchronized( sync ) { return function.put( k, v ); } }
public void clear() { synchronized( sync ) { function.clear(); } }
public String toString() { synchronized( sync ) { return function.toString(); } }
#if KEYS_PRIMITIVE || VALUES_PRIMITIVE
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
@Override
public VALUE_GENERIC_CLASS put( final KEY_GENERIC_CLASS k, final VALUE_GENERIC_CLASS v ) { synchronized( sync ) { return function.put( k, v ); } }
#if VALUES_PRIMITIVE
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
#endif
@Override
public VALUE_GENERIC_CLASS get( final Object k ) { synchronized( sync ) { return function.get( k ); } }
#if VALUES_PRIMITIVE
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
#endif
@Override
public VALUE_GENERIC_CLASS remove( final Object k ) { synchronized( sync ) { return function.remove( k ); } }
#endif
#if KEYS_PRIMITIVE
@Override
public VALUE_GENERIC_TYPE remove( final KEY_GENERIC_TYPE k ) { synchronized( sync ) { return function.remove( k ); } }
@Override
public VALUE_GENERIC_TYPE get( final KEY_GENERIC_TYPE k ) { synchronized( sync ) { return function.get( k ); } }
public boolean containsKey( final Object ok ) { synchronized( sync ) { return function.containsKey( ok ); } }
#endif
#if KEYS_REFERENCE
@Override
public VALUE_GENERIC_TYPE REMOVE_VALUE( final Object k ) { synchronized( sync ) { return function.REMOVE_VALUE( k ); } }
@Override
public VALUE_GENERIC_TYPE GET_VALUE( final Object k ) { synchronized( sync ) { return function.GET_VALUE( k ); } }
#endif
}
/** 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 KEY_VALUE_GENERIC FUNCTION KEY_VALUE_GENERIC synchronize( final FUNCTION KEY_VALUE_GENERIC f ) { return new SynchronizedFunction KEY_VALUE_GENERIC( 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 KEY_VALUE_GENERIC FUNCTION KEY_VALUE_GENERIC synchronize( final FUNCTION KEY_VALUE_GENERIC f, final Object sync ) { return new SynchronizedFunction KEY_VALUE_GENERIC( f, sync ); }
/** An unmodifiable wrapper class for functions. */
public static class UnmodifiableFunction KEY_VALUE_GENERIC extends ABSTRACT_FUNCTION KEY_VALUE_GENERIC implements java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final FUNCTION KEY_VALUE_GENERIC function;
protected UnmodifiableFunction( final FUNCTION KEY_VALUE_GENERIC f ) {
if ( f == null ) throw new NullPointerException();
this.function = f;
}
public int size() { return function.size(); }
public boolean containsKey( final KEY_TYPE k ) { return function.containsKey( k ); }
public VALUE_GENERIC_TYPE defaultReturnValue() { return function.defaultReturnValue(); }
public void defaultReturnValue( final VALUE_GENERIC_TYPE defRetValue ) { throw new UnsupportedOperationException(); }
public VALUE_GENERIC_TYPE put( final KEY_GENERIC_TYPE k, final VALUE_GENERIC_TYPE v ) { throw new UnsupportedOperationException(); }
public void clear() { throw new UnsupportedOperationException(); }
public String toString() { return function.toString(); }
#if KEYS_PRIMITIVE
#if VALUES_PRIMITIVE
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
#endif
@Override
public VALUE_GENERIC_TYPE remove( final KEY_GENERIC_TYPE k ) { throw new UnsupportedOperationException(); }
#if VALUES_PRIMITIVE
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
#endif
@Override
public VALUE_GENERIC_TYPE get( final KEY_GENERIC_TYPE k ) { return function.get( k ); }
public boolean containsKey( final Object ok ) { return function.containsKey( ok ); }
#endif
#if KEYS_REFERENCE || VALUES_REFERENCE
@Override
public VALUE_GENERIC_TYPE REMOVE_VALUE( final Object k ) { throw new UnsupportedOperationException(); }
@Override
public VALUE_GENERIC_TYPE GET_VALUE( final Object k ) { return function.GET_VALUE( k ); }
#endif
}
/** 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 KEY_VALUE_GENERIC FUNCTION KEY_VALUE_GENERIC unmodifiable( final FUNCTION KEY_VALUE_GENERIC f ) { return new UnmodifiableFunction KEY_VALUE_GENERIC( f ); }
}