com.intel.cryptostream.utils.IOUtils.java Source code

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Here is the source code for com.intel.cryptostream.utils.IOUtils.java

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/**
 * 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.cryptostream.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);
                    }
                }
            }
        }
    }
}