org.apache.aurora.common.args.parsers.MultimapParser.java Source code

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Here is the source code for org.apache.aurora.common.args.parsers.MultimapParser.java

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/**
 * 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 org.apache.aurora.common.args.parsers;

import java.lang.reflect.Type;
import java.util.List;

import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import com.google.common.reflect.TypeToken;

import org.apache.aurora.common.args.ArgParser;
import org.apache.aurora.common.args.Parser;
import org.apache.aurora.common.args.ParserOracle;
import org.apache.aurora.common.args.Parsers;

import static com.google.common.base.Preconditions.checkArgument;

/**
 * Multimap parser.
 */
@ArgParser
public class MultimapParser extends TypeParameterizedParser<Multimap<?, ?>> {

    private static final Splitter KEY_VALUE_SPLITTER = Splitter.on("=").trimResults().omitEmptyStrings();

    public MultimapParser() {
        super(2);
    }

    @SuppressWarnings("unchecked")
    @Override
    Multimap<?, ?> doParse(ParserOracle parserOracle, String raw, List<Type> typeParams) {
        Type keyType = typeParams.get(0);
        Parser<?> keyParser = parserOracle.get(TypeToken.of(keyType));

        Type valueType = typeParams.get(1);
        Parser<?> valueParser = parserOracle.get(TypeToken.of(valueType));

        ImmutableMultimap.Builder<Object, Object> multimapBuilder = ImmutableMultimap.builder();
        for (String keyAndValue : Parsers.MULTI_VALUE_SPLITTER.split(raw)) {
            List<String> fields = ImmutableList.copyOf(KEY_VALUE_SPLITTER.split(keyAndValue));
            checkArgument(fields.size() == 2, "Failed to parse key/value pair: " + keyAndValue);
            multimapBuilder.put(keyParser.parse(parserOracle, keyType, fields.get(0)),
                    valueParser.parse(parserOracle, valueType, fields.get(1)));
        }

        return multimapBuilder.build();
    }
}