annis.utils.Utils.java Source code

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Here is the source code for annis.utils.Utils.java

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/*
 * Copyright 2009-2011 Collaborative Research Centre SFB 632 
 *
 * 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 annis.utils;

import java.io.File;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Utils {

    private static final Logger log = LoggerFactory.getLogger(Utils.class);

    public static File getAnnisHomeLocation() {
        String annisHome = System.getProperty("annis.home");
        Validate.notNull(annisHome);
        File fAnnisHome = new File(annisHome);
        return fAnnisHome;
    }

    public static File getAnnisFile(String subpath) {
        File annisConfig = getAnnisHomeLocation();
        return new File(annisConfig, subpath);
    }

    public static String min(List<Long> runtimeList) {
        long min = Long.MAX_VALUE;
        for (long value : runtimeList) {
            min = Math.min(min, value);
        }
        return String.valueOf(min);
    }

    public static String max(List<Long> runtimeList) {
        long max = Long.MIN_VALUE;
        for (long value : runtimeList) {
            max = Math.max(max, value);
        }
        return String.valueOf(max);
    }

    public static String avg(List<Long> runtimeList) {
        if (runtimeList.isEmpty()) {
            return "";
        }

        long sum = 0;
        for (long value : runtimeList) {
            sum += value;
        }
        return String.valueOf(sum / runtimeList.size());
    }

    public static Long[] split2Long(String text, char seperator) {
        String[] str = StringUtils.split(text, seperator);
        Long[] lng = new Long[str.length];

        for (int i = 0; i < lng.length; i++) {
            try {
                lng[i] = Long.parseLong(str[i]);
            } catch (NumberFormatException ex) {
                log.error("Could not parse long value, assuming \"0\" as default", ex);
            }
        }

        return lng;
    }

    /** Hashes a string using SHA-256. */
    public static String calculateSHAHash(String s) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(s.getBytes("UTF-8"));
        byte[] digest = md.digest();

        StringBuilder hashVal = new StringBuilder();
        for (byte b : digest) {
            hashVal.append(String.format("%02x", b));
        }

        return hashVal.toString();
    }
}