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The official specificiation and library for the Concourse Criteria Language

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/*
 * Copyright (c) 2013-2017 Cinchapi 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 com.cinchapi.ccl.grammar;

/**
 * A {@link Symbol} that represents a value.
 */
public abstract class ValueTokenSymbol implements PostfixNotationSymbol {

    /**
     * The content of the {@link Symbol}.
     */
    protected final T value;

    /**
     * Construct a new instance.
     *
     * @param value
     */
    public ValueTokenSymbol(T value) {
        this.value = value;
    }

    @Override
    public boolean equals(Object obj) {
        if(obj instanceof ValueTokenSymbol) {
            return value.equals(((ValueTokenSymbol) obj).value);
        }
        else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        return value.hashCode();
    }
    
    @Override
    public String toString() {
        return value.toString();
    }

    /**
     * Return the value that this {@link Symbol} expresses.
     *
     * @return the value
     */
    public T value() {
        return value;
    }
}