/*
* Chrysalix
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
* See the AUTHORS.txt file in the distribution for a full listing of
* individual contributors.
*
* Chrysalix is free software. Unless otherwise indicated, all code in Chrysalix
* is licensed to you 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.
*
* Chrysalix 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.chrysalix.operation;
import org.chrysalix.ChrysalixException;
import org.chrysalix.ChrysalixI18n;
import org.chrysalix.transformation.Operation;
import org.chrysalix.transformation.OperationDescriptor;
import org.chrysalix.transformation.Transformation;
import org.chrysalix.transformation.TransformationFactory;
import org.chrysalix.transformation.ValidationProblem;
import org.chrysalix.transformation.ValidationProblems;
import org.chrysalix.transformation.ValueDescriptor;
import org.modelspace.ModelObject;
import org.modelspace.ModelspaceException;
/**
* Provides a random number with a positive sign, greater than or equal to {@code 0.0} and less than {@code 1.0}. There is an
* optional term for a seed value.
*/
public final class Random extends AbstractOperation< Double > {
static final String DESCRIPTION =
"Provides a random number with a positive sign, greater than or equal to 0.0 and less than 1.0.";
private static final String INVALID_NUMBER_OF_TERMS = "Random operation in transformation '%s' cannot have any terms";
static final String NAME = "Random";
/**
* The output descriptor.
*/
public static final OperationDescriptor< Double > DESCRIPTOR =
new AbstractOperationDescriptor< Double >( TransformationFactory.createId( Random.class ),
ChrysalixI18n.localize( DESCRIPTION ),
ChrysalixI18n.localize( NAME ),
Double.class,
ValueDescriptor.NO_DESCRIPTORS ) {
/**
* {@inheritDoc}
*
* @see org.chrysalix.transformation.OperationDescriptor#newInstance(org.modelspace.ModelObject,
* org.chrysalix.transformation.Transformation)
*/
@Override
public Operation< Double > newInstance( final ModelObject operation,
final Transformation transformation ) throws ModelspaceException, ChrysalixException {
return new Random( operation, transformation );
}
};
/**
* @param operation
* the operation model object (cannot be <code>null</code>)
* @param transformation
* the transformation containing this operation (cannot be <code>null</code>)
* @throws ModelspaceException
* if an error with the model object occurs
* @throws ChrysalixException
* if a non-model object error occurs
* @throws IllegalArgumentException
* if the input is <code>null</code>
*/
Random( final ModelObject operation,
final Transformation transformation ) throws ModelspaceException, ChrysalixException {
super( operation, transformation );
}
/**
* {@inheritDoc}
*
* @see org.chrysalix.operation.AbstractOperation#calculate()
*/
@Override
protected Double calculate() throws ChrysalixException {
assert !problems().isError();
return Math.random();
}
/**
* {@inheritDoc}
*
* @see org.chrysalix.operation.AbstractOperation#problems()
*/
@Override
public ValidationProblems problems() throws ChrysalixException {
this.problems.clear();
// make sure there is at most one term
if ( inputs().length != 0 ) {
final ValidationProblem problem =
TransformationFactory.createError( transformationId(),
ChrysalixI18n.localize( INVALID_NUMBER_OF_TERMS, transformationId() ) );
problems().add( problem );
}
return super.problems();
}
}