RandUnuran.java

/*
 * Class:        RandUnuran
 * Description:  provides the access point to the C package UNURAN
 * Environment:  Java
 * Software:     SSJ
 * Copyright (C) 2001  Pierre L'Ecuyer and Universite de Montreal
 * Organization: DIRO, Universite de Montreal
 * @author       Éric Buist
 * @since
 *
 *
 * 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 umontreal.ssj.randvar;
 
import umontreal.ssj.rng.*;
import umontreal.ssj.util.NativeUtils;

class RandUnuran {
 
   // These arrays are used to store precomputed uniforms
   // from main and auxiliary streams when generating
   // arrays of variates.
   protected double[] unifArray = null;
   protected double[] unifAuxArray = null;
 
   protected RandomStream mainStream;
   protected RandomStream auxStream;
   protected long nativeParams = 0;
 
   protected RandUnuran() {
   }
 
   protected native void init(String genStr);
 
   protected void finalize() {
      close();
   }
 
   public native void close();
 
   // random variate generation native methods
   protected native int getRandDisc(double u, long np);
 
   protected native double getRandCont(double u, long np);
 
   protected native void getRandVec(double u, long np, double[] vec);
 
   // random array of variates generation native methods
   protected native void getRandDiscArray(long np, double[] u, double[] uaux, int[] v, int start, int n);
 
   protected native void getRandContArray(long np, double[] u, double[] uaux, double[] v, int start, int n);
 
   // methods to query the type of distribution for error checking
   protected native boolean isDiscrete();
 
   protected native boolean isContinuous();
 
   protected native boolean isContinuousMultivariate();
 
   protected native boolean isEmpirical();
 
   protected native boolean isEmpiricalMultivariate();
 
   static {
      try {
         NativeUtils.loadLibraryFromJar("/jni/" + System.mapLibraryName("randvar"));
      } catch (java.io.IOException e) {
         throw new UnsatisfiedLinkError(e.getMessage());
      }
   }
}