/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.intel.chimera.utils;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.logging.Log;

public class IOUtils {
  public static void readFully(InputStream in, byte buf[],
      int off, int len) throws IOException {
    int toRead = len;
    while (toRead > 0) {
      int ret = in.read(buf, off, toRead);
      if (ret < 0) {
        throw new IOException( "Premature EOF from inputStream");
      }
      toRead -= ret;
      off += ret;
    }
  }

  /**
   * Close the Closeable objects and <b>ignore</b> any {@link IOException} or 
   * null pointers. Must only be used for cleanup in exception handlers.
   *
   * @param log the log to record problems to at debug level. Can be null.
   * @param closeables the objects to close
   */
  public static void cleanup(Log log, java.io.Closeable... closeables) {
    for (java.io.Closeable c : closeables) {
      if (c != null) {
        try {
          c.close();
        } catch(Throwable e) {
          if (log != null && log.isDebugEnabled()) {
            log.debug("Exception in closing " + c, e);
          }
        }
      }
    }
  }
}