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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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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.cassandra.cql3;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

public enum Operator
{
    EQ(0), LT(4), LTE(3), GTE(1), GT(2), IN(7), CONTAINS(5), CONTAINS_KEY(6), NEQ(8);

    /**
     * The binary representation of this Enum value.
     */
    private final int b;

    /**
     * Creates a new Operator with the specified binary representation.
     * @param b the binary representation of this Enum value
     */
    private Operator(int b)
    {
        this.b = b;
    }

    /**
     * Write the serialized version of this Operator to the specified output.
     *
     * @param output the output to write to
     * @throws IOException if an I/O problem occurs while writing to the specified output
     */
    public void writeTo(DataOutput output) throws IOException
    {
        output.writeInt(b);
    }

    /**
     * Deserializes a Operator instance from the specified input.
     *
     * @param input the input to read from
     * @return the Operator instance deserialized
     * @throws IOException if a problem occurs while deserializing the Type instance.
     */
    public static Operator readFrom(DataInput input) throws IOException
    {
          int b = input.readInt();
          for (Operator operator : values())
              if (operator.b == b)
                  return operator;

          throw new IOException(String.format("Cannot resolve Relation.Type from binary representation: %s", b));
    }

    @Override
    public String toString()
    {
        switch (this)
        {
            case EQ:
                return "=";
            case LT:
                return "<";
            case LTE:
                return "<=";
            case GT:
                return ">";
            case GTE:
                return ">=";
            case NEQ:
                return "!=";
            case CONTAINS_KEY:
                return "CONTAINS KEY";
            default:
                return this.name();
        }
    }
}