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/*
* Copyright (C) 2002-2014 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;
/** An abstract class providing basic methods for functions implementing a type-specific interface.
*
* <P>Optional operations just throw an {@link
* UnsupportedOperationException}. Generic versions of accessors delegate to
* the corresponding type-specific counterparts following the interface rules
* (they take care of returning <code>null</code> on a missing key).
*
* <P>This class handles directly a default return
* value (including {@linkplain #defaultReturnValue() methods to access
* it}). Instances of classes inheriting from this class have just to return
* <code>defRetValue</code> to denote lack of a key in type-specific methods. The value
* is serialized.
*
* <P>Implementing subclasses have just to provide type-specific <code>get()</code>,
* type-specific <code>containsKey()</code>, and <code>size()</code> methods.
*
*/
public abstract class ABSTRACT_FUNCTION KEY_VALUE_GENERIC implements FUNCTION KEY_VALUE_GENERIC, java.io.Serializable {
private static final long serialVersionUID = -4940583368468432370L;
protected ABSTRACT_FUNCTION() {}
/**
* The default return value for <code>get()</code>, <code>put()</code> and
* <code>remove()</code>.
*/
protected VALUE_GENERIC_TYPE defRetValue;
public void defaultReturnValue( final VALUE_GENERIC_TYPE rv ) {
defRetValue = rv;
}
public VALUE_GENERIC_TYPE defaultReturnValue() {
return defRetValue;
}
public VALUE_GENERIC_TYPE put( KEY_GENERIC_TYPE key, VALUE_GENERIC_TYPE value ) {
throw new UnsupportedOperationException();
}
public VALUE_GENERIC_TYPE REMOVE_VALUE( KEY_TYPE key ) {
throw new UnsupportedOperationException();
}
public void clear() {
throw new UnsupportedOperationException();
}
#if #keys(primitive)
public boolean containsKey( final Object ok ) {
return containsKey( KEY_OBJ2TYPE( ok ) );
}
#endif
#if #keys(primitive) || #values(primitive)
/** Delegates to the corresponding type-specific method, taking care of returning <code>null</code> on a missing key.
*
* <P>This method must check whether the provided key is in the map using <code>containsKey()</code>. Thus,
* it probes the map <em>twice</em>. Implementors of subclasses should override it with a more efficient method.
*/
public VALUE_GENERIC_CLASS get( final Object ok ) {
final KEY_TYPE k = KEY_OBJ2TYPE( ok );
return containsKey( k ) ? VALUE2OBJ( GET_VALUE( k ) ) : null;
}
/** Delegates to the corresponding type-specific method, taking care of returning <code>null</code> on a missing key.
*
* <P>This method must check whether the provided key is in the map using <code>containsKey()</code>. Thus,
* it probes the map <em>twice</em>. Implementors of subclasses should override it with a more efficient method.
*/
public VALUE_GENERIC_CLASS put( final KEY_GENERIC_CLASS ok, final VALUE_GENERIC_CLASS ov ) {
final KEY_GENERIC_TYPE k = KEY_CLASS2TYPE( ok );
final boolean containsKey = containsKey( k );
final VALUE_GENERIC_TYPE v = put( k, VALUE_CLASS2TYPE( ov ) );
return containsKey ? VALUE2OBJ( v ) : null;
}
/** Delegates to the corresponding type-specific method, taking care of returning <code>null</code> on a missing key.
*
* <P>This method must check whether the provided key is in the map using <code>containsKey()</code>. Thus,
* it probes the map <em>twice</em>. Implementors of subclasses should override it with a more efficient method.
*/
public VALUE_GENERIC_CLASS remove( final Object ok ) {
final KEY_TYPE k = KEY_OBJ2TYPE( ok );
final boolean containsKey = containsKey( k );
final VALUE_GENERIC_TYPE v = REMOVE_VALUE( k );
return containsKey ? VALUE2OBJ( v ) : null;
}
#endif
}
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