/*
 * Copyright 2014-2016 the libsecp256k1 contributors
 *
 * 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 org.bitcoin;

/**
 * This class holds the context reference used in native methods
 * to handle ECDSA operations.
 */
public class Secp256k1Context {
  private static final boolean enabled; //true if the library is loaded
  private static final long context; //ref to pointer to context obj

  static { //static initializer
    boolean isEnabled = true;
    long contextRef = -1;
    try {
      System.loadLibrary("secp256k1");
      contextRef = secp256k1InitContext();
    } catch (UnsatisfiedLinkError e) {
      System.out.println("UnsatisfiedLinkError: " + e);
      isEnabled = false;
    }
    enabled = isEnabled;
    context = contextRef;
  }

  public static boolean isEnabled() {
    return enabled;
  }

  public static long getContext() {
    if (!enabled) return -1; //sanity check
    return context;
  }

  private static native long secp256k1InitContext();
}