/**
 * Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package org.evosuite.symbolic.expr;

import java.util.HashSet;
import java.util.Set;

public abstract class AbstractExpression<T> implements Expression<T> {

	private static final long serialVersionUID = 2896502683190522448L;

	private Expression<?> parent = null;

	protected T concreteValue;

	private final int size;

	public AbstractExpression(T concreteValue, int size, boolean containsSymbolicVariable) {
		this.concreteValue = concreteValue;
		this.size = size;
		this.containsSymbolicVariable = containsSymbolicVariable;
	}

	@Override
	public final int getSize() {
		return size;
	}

	/**
	 * <p>
	 * Getter for the field <code>parent</code>.
	 * </p>
	 * 
	 * @return a {@link org.evosuite.symbolic.expr.Expression} object.
	 */
	@Override
	public final Expression<?> getParent() {
		return this.parent;
	}

	/** {@inheritDoc} */
	@Override
	public final void setParent(Expression<?> expr) {
		this.parent = expr;
	}

	private final boolean containsSymbolicVariable;

	@Override
	public final boolean containsSymbolicVariable() {
		return containsSymbolicVariable;
	}

	/** {@inheritDoc} */
	@Override
	public final T getConcreteValue() {
		return concreteValue;
	}

	@Override
	public Set<Object> getConstants() {
		Set<Object> result = new HashSet<Object>();
		result.add(this.concreteValue);
		return result;
	}

}