com.moz.fiji.common.flags.parser.StringMapParser.java Source code

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Here is the source code for com.moz.fiji.common.flags.parser.StringMapParser.java

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/**
 * Licensed to WibiData, Inc. under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  WibiData, Inc.
 * 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.moz.fiji.common.flags.parser;

import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import com.google.common.collect.Maps;

import com.moz.fiji.common.flags.FlagSpec;
import com.moz.fiji.common.flags.IllegalFlagValueException;
import com.moz.fiji.common.flags.ValueParser;

/**
 * Parser for a list of strings.
 *
 * Usage example:
 *   <code>tool --flag=key1=value1 --flag=key2=value2 --value=key3=value3</code>
 */
public class StringMapParser implements ValueParser<Map> {
    /** {@inheritDoc} */
    @Override
    public Class<? extends Map> getParsedClass() {
        return Map.class;
    }

    /** {@inheritDoc} */
    @Override
    public boolean parsesSubclasses() {
        return true;
    }

    /** {@inheritDoc} */
    @Override
    public Map<String, String> parse(FlagSpec flag, List<String> values) {
        final TreeMap<String, String> map = Maps.newTreeMap();
        for (String keyValue : values) {
            if (keyValue == null) {
                throw new IllegalFlagValueException(flag, keyValue);
            }
            final String[] split = keyValue.split("=", 2);
            if (split.length != 2) {
                throw new IllegalFlagValueException(flag, keyValue);
            }
            map.put(split[0], split[1]);
        }
        return map;
    }
}