ei.ne.ke.cassandra.cql3.template.Comparator.java Source code

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Here is the source code for ei.ne.ke.cassandra.cql3.template.Comparator.java

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/*
 * Copyright 2013 EK3 Technologies, Inc.
 *
 * 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 ei.ne.ke.cassandra.cql3.template;

import java.util.Map;

import org.apache.commons.lang.StringUtils;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

/**
 *
 */
public enum Comparator {

    EQ("="), LT("<"), GT(">"), LT_OR_EQ("<="), GT_OR_EQ(">="), IN("IN");

    private static final Map<String, Comparator> STR_LOOKUP;
    private final String literal;

    /**
     * @param literal
     */
    private Comparator(String literal) {
        this.literal = literal;
    }

    /**
     *
     *
     * @param literal
     * @return
     */
    public static Comparator getEnum(String literal) {
        String trimmedLiteral = StringUtils.trim(literal);
        if (!STR_LOOKUP.containsKey(trimmedLiteral)) {
            throw new IllegalArgumentException("Unknown comparator: " + trimmedLiteral);
        }
        return STR_LOOKUP.get(trimmedLiteral);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return literal;
    }

    static {
        Map<String, Comparator> tmp = Maps.newHashMap();
        for (Comparator comp : Comparator.values()) {
            tmp.put(comp.literal, comp);
        }
        STR_LOOKUP = ImmutableMap.copyOf(tmp);
    }

}