org.apache.hadoop.io.crypto.bee.BeeUtil.java Source code

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Here is the source code for org.apache.hadoop.io.crypto.bee.BeeUtil.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 org.apache.hadoop.io.crypto.bee;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class BeeUtil {
    private static final Log LOG = LogFactory.getLog(BeeUtil.class);

    public static String getStackTrace(Throwable throwable) {
        // for LOG, you can directly use LOG.error("", e).
        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        throwable.printStackTrace(printWriter);
        return writer.toString();
    }

    /**
     * To retrieve property from
     * BeeConstants.BEE_CRYPTO_PROPERTIES_FILE(/usr/lib/bee
     * /bee-crypto/bee.properties)
     * 
     * @param propertyName
     * @return property value or null for Exception FileNotFoundException or
     *         IOException
     * @throws IOException
     */
    public static String getCryptoProperty(String propertyName) throws IOException {
        FileInputStream fiStream = null;
        try {
            Properties prop = new Properties();
            fiStream = new FileInputStream(new File(BeeConstants.BEE_CRYPTO_PROPERTIES_FILE));
            prop.load(fiStream);
            return prop.getProperty(propertyName);
        } catch (FileNotFoundException e) {
            LOG.warn("bee-crypto perperties file not found: " + BeeConstants.BEE_CRYPTO_PROPERTIES_FILE);
        } catch (IOException e) {
            LOG.warn("Fail to retrieve property:" + propertyName, e);
        } finally {
            if (fiStream != null)
                fiStream.close();
        }
        return null;
    }

}