org.apache.slider.common.params.ArgOps.java Source code

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Here is the source code for org.apache.slider.common.params.ArgOps.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.slider.common.params;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.slider.core.exceptions.BadCommandArgumentsException;
import org.apache.slider.core.exceptions.ErrorStrings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Static argument manipulation operations
 */
public class ArgOps {

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

    /**
     * create a 3-tuple
     */
    public static List<Object> triple(String msg, int min, int max) {
        List<Object> l = new ArrayList<Object>(3);
        l.add(msg);
        l.add(min);
        l.add(max);
        return l;
    }

    /**
     * Create a tuple
     */
    public static List<Object> tuple(String msg, int min) {
        return triple(msg, min, min);
    }

    public static void applyFileSystemBinding(String filesystemBinding, Configuration conf) {
        if (filesystemBinding != null) {
            //filesystem argument was set -this overwrites any defaults in the
            //configuration
            FileSystem.setDefaultUri(conf, filesystemBinding);
        }
    }

    public static void splitPairs(Collection<String> pairs, Map<String, String> dest) {
        for (String prop : pairs) {
            String[] keyval = prop.split("=", 2);
            if (keyval.length == 2) {
                dest.put(keyval[0], keyval[1]);
            }
        }
    }

    public static void applyDefinitions(Map<String, String> definitionMap, Configuration conf) {
        for (Map.Entry<String, String> entry : definitionMap.entrySet()) {
            String key = entry.getKey();
            String val = entry.getValue();
            log.debug("configuration[{}]<=\"{}\"", key, val);
            conf.set(key, val, "command line");
        }
    }

    /**
     * Create a map from a tuple list like ['worker','2','master','1] into a map
     * ['worker':'2',"master":'1'];
     * Duplicate entries also trigger errors
     * @param description description for errors
     * @param list list to conver to tuples
     * @return the map of key value pairs -unordered.
     * @throws BadCommandArgumentsException odd #of arguments received
     */
    public static Map<String, String> convertTupleListToMap(String description, List<String> list)
            throws BadCommandArgumentsException {
        Map<String, String> results = new HashMap<String, String>();
        if (list != null && !list.isEmpty()) {
            int size = list.size();
            if (size % 2 != 0) {
                //odd number of elements, not permitted
                throw new BadCommandArgumentsException(ErrorStrings.ERROR_PARSE_FAILURE + description);
            }
            for (int count = 0; count < size; count += 2) {
                String key = list.get(count);
                String val = list.get(count + 1);
                if (results.get(key) != null) {
                    throw new BadCommandArgumentsException(
                            ErrorStrings.ERROR_DUPLICATE_ENTRY + description + ": " + key);
                }
                results.put(key, val);
            }
        }
        return results;
    }

    /**
     * Create a map from a tuple list like
     * ['worker','heapsize','5G','master','heapsize','2M'] into a map
     * ['worker':'2',"master":'1'];
     * Duplicate entries also trigger errors
        
     * @throws BadCommandArgumentsException odd #of arguments received
     */
    public static Map<String, Map<String, String>> convertTripleListToMaps(String description, List<String> list)
            throws BadCommandArgumentsException {
        Map<String, Map<String, String>> results = new HashMap<String, Map<String, String>>();
        if (list != null && !list.isEmpty()) {
            int size = list.size();
            if (size % 3 != 0) {
                //wrong number of elements, not permitted
                throw new BadCommandArgumentsException(ErrorStrings.ERROR_PARSE_FAILURE + description);
            }
            for (int count = 0; count < size; count += 3) {
                String role = list.get(count);
                String key = list.get(count + 1);
                String val = list.get(count + 2);
                Map<String, String> roleMap = results.get(role);
                if (roleMap == null) {
                    //demand create new role map
                    roleMap = new HashMap<String, String>();
                    results.put(role, roleMap);
                }
                if (roleMap.get(key) != null) {
                    throw new BadCommandArgumentsException(ErrorStrings.ERROR_DUPLICATE_ENTRY + description
                            + ": for key " + key + " under " + role);
                }
                roleMap.put(key, val);
            }
        }
        return results;
    }
}