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package javax.faces.flow;

import javax.el.ValueExpression;

/**
 * Represents a parameter in any of several
 * places where parameters are needed when processing flows.
 * 
 * @since 2.2
 */
public abstract class Parameter {
    
    /**
     * Return the name of the parameter
     * 
     * @since 2.2
     * 
     * @return the name of the parameter
     */
    
    public abstract String getName();

    /**
     * Return a {@code ValueExpression} for the
     * value of the parameter.  Depending on the context, this expression
     * may only ever be evaluated in a "get" operation.
     * 
     * @since 2.2
     * 
     * @return a {@code ValueExpression} for the value of the parameter
     */
    public abstract ValueExpression getValue();

}