Utils.java

/*
 * 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.tron.common.util;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

import org.fusesource.hawtjni.runtime.Library;

public interface Utils {
    Library LIBRARY = new Library("zksnarkjni", Utils.class);

  static String getParamsFile(String fileName) {
    try {
      File target = Paths.get(System.getProperty("java.io.tmpdir"),
          fileName + "." + System.currentTimeMillis()).toFile();
      try (InputStream in = Thread.currentThread().getContextClassLoader()
          .getResourceAsStream("params" + File.separator + fileName);
           ){
        if (in != null) {
          Files.copy(in, target.toPath(), StandardCopyOption.REPLACE_EXISTING);
          target.deleteOnExit();
          return target.getAbsolutePath();
        } else {
          throw new IOException("Resource not found: " + fileName);
        }
      }
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }

}