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

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Here is the source code for org.apache.aurora.common.args.parsers.UnitParser.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.util.EnumSet;
import java.util.Map;

import com.google.common.base.Functions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;

import org.apache.aurora.common.args.ArgParser;
import org.apache.aurora.common.quantity.Data;
import org.apache.aurora.common.quantity.Time;
import org.apache.aurora.common.quantity.Unit;

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

/**
 * Unit parser.
 * Units are matched (case sensitively) against the result of {@link Unit#toString()}.
 */
@ArgParser
public class UnitParser extends NonParameterizedTypeParser<Unit<?>> {

    private final Map<String, Unit<?>> unitValues;

    public UnitParser() {
        unitValues = Maps.uniqueIndex(
                ImmutableList.<Unit<?>>builder().add(Time.values()).add(Data.values()).build(),
                Functions.toStringFunction());
    }

    @Override
    public Unit<?> doParse(String raw) {
        Unit<?> unit = unitValues.get(raw);

        checkArgument(unit != null, String.format("No Units found matching %s, options: (Time): %s, (Data): %s",
                raw, EnumSet.allOf(Time.class), EnumSet.allOf(Data.class)));
        return unit;
    }
}