Examples with PrecedingSiblingAxis org.sirix.axis.PrecedingSiblingAxis used on opensource projects

Example 1 with PrecedingSiblingAxis

use of org.sirix.axis.PrecedingSiblingAxis in project sirix by sirixdb.

the class ExpressionSingle method isDupOrd.

/**
 * Determines for a given string representation of an axis, whether this axis leads to duplicates
 * in the result sequence or not. Furthermore it determines the new state for the order state that
 * specifies, if the result sequence is in document order. This method is implemented according to
 * the automata in [Hidders, J., Michiels, P., "Avoiding Unnecessary Ordering Operations in
 * XPath", 2003]
 *
 * @param ax name of the current axis
 * @return true, if expression is still duplicate free
 */
public boolean isDupOrd(final Axis ax) {
    Axis axis = ax;
    while (axis instanceof FilterAxis) {
        axis = ((FilterAxis) axis).getAxis();
    }
    if (axis instanceof UnionAxis) {
        mOrd = mOrd.updateOrdUnion();
        mDup = mDup.updateUnion();
    } else if (axis instanceof ChildAxis) {
        mOrd = mOrd.updateOrdChild();
        mDup = mDup.updateDupChild();
    } else if (axis instanceof ParentAxis) {
        mOrd = mOrd.updateOrdParent();
        mDup = mDup.updateDupParent();
    } else if (axis instanceof DescendantAxis) {
        mOrd = mOrd.updateOrdDesc();
        mDup = mDup.updateDupDesc();
    } else if (axis instanceof AncestorAxis) {
        mOrd = mOrd.updateOrdAncestor();
        mDup = mDup.updateDupAncestor();
    } else if (axis instanceof FollowingAxis || axis instanceof PrecedingAxis) {
        mOrd = mOrd.updateOrdFollPre();
        mDup = mDup.updateDupFollPre();
    } else if (axis instanceof FollowingSiblingAxis || axis instanceof PrecedingSiblingAxis) {
        mOrd = mOrd.updateOrdFollPreSib();
        mDup = mDup.updateDupFollPreSib();
    }
    return !DupState.nodup;
}

Example 2 with PrecedingSiblingAxis

use of org.sirix.axis.PrecedingSiblingAxis in project sirix by sirixdb.

the class XPathParser method parseReverceAxis.

/**
 * Parses the the rule ReverceAxis according to the following production rule: [33] ReverseAxis
 * ::= <"parent" "::"> | <"ancestor" "::"> | <"preceding-sibling" "::">|<"preceding"
 * "::">|<"ancestor-or-self" "::"> .
 *
 * @return axis
 */
private AbstractAxis parseReverceAxis() {
    AbstractAxis axis;
    if (is("parent", true)) {
        axis = new ParentAxis(getTransaction());
    } else if (is("ancestor", true)) {
        axis = new AncestorAxis(getTransaction());
    } else if (is("ancestor-or-self", true)) {
        axis = new AncestorAxis(getTransaction(), IncludeSelf.YES);
    } else if (is("preceding", true)) {
        axis = new PrecedingAxis(getTransaction());
    } else {
        consume("preceding-sibling", true);
        axis = new PrecedingSiblingAxis(getTransaction());
    }
    consume(TokenType.COLON, true);
    consume(TokenType.COLON, true);
    return axis;
}