RangeGroup.java

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package org.hsqldb;

/**
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.3.2
 * @since 2.2.9
 */

public interface RangeGroup {

    RangeGroup emptyGroup = new RangeGroupEmpty();
    RangeGroup[] emptyArray = new RangeGroup[]{
        emptyGroup };

    RangeVariable[] getRangeVariables();

    void setCorrelated();

    boolean isVariable();

    public class RangeGroupSimple implements RangeGroup {

        RangeVariable[] ranges;
        RangeGroup      baseGroup;
        TableDerived    table;
        boolean         isVariable;

        public RangeGroupSimple(TableDerived table) {
            ranges     = RangeVariable.emptyArray;
            this.table = table;
        }

        public RangeGroupSimple(RangeVariable[] ranges, RangeGroup baseGroup) {
            this.ranges    = ranges;
            this.baseGroup = baseGroup;
        }

        public RangeGroupSimple(RangeVariable[] ranges, boolean isVariable) {
            this.ranges     = ranges;
            this.isVariable = isVariable;
        }

        public RangeVariable[] getRangeVariables() {
            return ranges;
        }

        public void setCorrelated() {

            if (baseGroup != null) {
                baseGroup.setCorrelated();
            }

            if (table != null) {
                table.setCorrelated();
            }
        }

        public boolean isVariable() {
            return isVariable;
        }
    }

    public class RangeGroupEmpty implements RangeGroup {

        RangeGroupEmpty() {

            //
        }

        public RangeVariable[] getRangeVariables() {
            return RangeVariable.emptyArray;
        }

        public void setCorrelated() {

            //
        }

        public boolean isVariable() {
            return false;
        }
    }
}