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   *  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
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.exp;
  
  import org.apache.cayenne.util.Util;
  
  import java.io.Serializable;
  import java.util.Objects;
  
  /**
   * Named parameter for parameterized expressions.
   */
  public class ExpressionParameter implements Serializable {
  
  	private static final long serialVersionUID = -8324061115570177022L;
  	
  	protected String name;
  
  	/**
  	 * Constructor for ExpressionParam.
  	 */
  	public ExpressionParameter(String name) {
  		this.name = name;
  	}
  
  	/**
  	 * Returns the name of the expression parameter.
  	 */
  	public String getName() {
  		return name;
  	}
  
  	@Override
  	public String toString() {
  		return '$' + name;
  	}
  
  	@Override
  	public boolean equals(Object o) {
  		if (!(o instanceof ExpressionParameter)) {
  			return false;
  		}
  
  		ExpressionParameter parameter = (ExpressionParameter) o;
  		return Util.nullSafeEquals(name, parameter.name);
  	}
  
  	@Override
  	public int hashCode() {
  		return Objects.hash(name);
  	}
  }
  