manifold.api.highjump.ExpressionClass Maven / Gradle / Ivy
/*
* Copyright (c) 2019 - Manifold Systems LLC
*
* 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 manifold.api.highjump;
import java.util.Map;
import java.util.concurrent.atomic.LongAdder;
import manifold.util.ReflectUtil;
class ExpressionClass
{
private static final LongAdder COUNT = new LongAdder();
final String _fqn;
final Options _options;
Class _class;
public ExpressionClass( Options options, Map fqnToExprClass )
{
_options = options;
_fqn = HighjumpTypeManifold.FQN_PREFIX + incCount();
fqnToExprClass.put( _fqn, this );
}
Options getOptions()
{
return _options;
}
Object evaluate()
{
ReflectUtil.ConstructorRef ctor = ReflectUtil.constructor( getExprClass() );
if( ctor == null )
{
throw new RuntimeException( "Missing no-argument constructor: " + getExprClass().getTypeName() );
}
return ReflectUtil.method( ctor.newInstance(), "evaluate" ).invoke();
}
Class getExprClass()
{
if( _class == null )
{
try
{
_class = _options.contextLoader == null ? Class.forName( _fqn ) : Class.forName( _fqn, true, _options.contextLoader );
}
catch( ClassNotFoundException e )
{
ClassLoader threadContextClassLoader = Thread.currentThread().getContextClassLoader();
try
{
_class = Class.forName( _fqn, true, threadContextClassLoader );
}
catch( ClassNotFoundException ex )
{
throw new RuntimeException( e );
}
}
}
return _class;
}
private static long incCount()
{
COUNT.increment();
return COUNT.longValue();
}
}