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// For information as to what this class does, see the Javadoc, below.       //
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// Scheines, Joseph Ramsey, and Clark Glymour.                               //
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package edu.cmu.tetrad.study.gene.tetrad.gene.graph;

import edu.cmu.tetrad.study.gene.tetrad.gene.history.LaggedFactor;

/**
 * Translates display names of lagged variables (e.g. "V1:L1") into model names
 * (e.g. "V1:1") and vice-versa.
 *
 * @author josephramsey
 */
public final class DisplayNameHandler {

    /**
     * Converts the given lagged factor into a display string.
     */
    public static String getDisplayString(LaggedFactor laggedFactor) {
        return DisplayNameHandler.getDisplayString(laggedFactor.getFactor(),
                laggedFactor.getLag());
    }

    /**
     * Uses the given factor and lag information to construct a display string.
     */
    public static String getDisplayString(String factor, int lag) {
        return factor + ":L" + lag;
    }

    /**
     * Parses the given string and returns the LaggedFactor it represents.
     */
    public static LaggedFactor getLaggedFactor(String displayString) {

        String factor = DisplayNameHandler.extractFactor_Display(displayString);
        int lag = DisplayNameHandler.extractLag_Display(displayString);

        return new LaggedFactor(factor, lag);
    }

    /**
     * Parses the given string representing a lagged factor and return the part
     * that represents the factor.
     */
    public static String extractFactor_Display(String laggedFactor) {

        int colonIndex = laggedFactor.indexOf(":L");

        return laggedFactor.substring(0, colonIndex);
    }

    /**
     * Extracts the lag from the lagged factor name string. precondition
     * laggedFactor is a legal lagged factor.
     *
     * @param laggedFactor the lagged factor whose lag is wanted.
     * @return the lag of this lagged factor.
     */
    public static int extractLag_Display(String laggedFactor) {

        int colonIndex = laggedFactor.indexOf(":L");

        return Integer.parseInt(
                laggedFactor.substring(colonIndex + 2));
    }
}





