Examples with UnionAxis org.sirix.service.xml.xpath.expr.UnionAxis used on opensource projects

Example 1 with UnionAxis

use of org.sirix.service.xml.xpath.expr.UnionAxis 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 UnionAxis

use of org.sirix.service.xml.xpath.expr.UnionAxis in project sirix by sirixdb.

the class ExpressionSingleTest method testDup.

@Test
public void testDup() throws SirixException {
    ExpressionSingle builder = new ExpressionSingle();
    builder.add(new ChildAxis(holder.getReader()));
    builder.add(new DescendantAxis(holder.getReader()));
    assertTrue(builder.getExpr() instanceof NestedAxis);
    builder = new ExpressionSingle();
    builder.add(new ChildAxis(holder.getReader()));
    builder.add(new DescendantAxis(holder.getReader()));
    assertEquals(true, builder.isOrdered());
    assertTrue(builder.getExpr() instanceof NestedAxis);
    builder = new ExpressionSingle();
    builder.add(new ChildAxis(holder.getReader()));
    builder.add(new DescendantAxis(holder.getReader()));
    builder.add(new ChildAxis(holder.getReader()));
    assertEquals(false, builder.isOrdered());
    builder = new ExpressionSingle();
    builder = new ExpressionSingle();
    builder.add(new ChildAxis(holder.getReader()));
    builder.add(new DescendantAxis(holder.getReader()));
    builder.add(new ChildAxis(holder.getReader()));
    builder.add(new ParentAxis(holder.getReader()));
    assertEquals(true, builder.isOrdered());
    builder = new ExpressionSingle();
    builder.add(new ChildAxis(holder.getReader()));
    builder.add(new DescendantAxis(holder.getReader()));
    builder.add(new FollowingSiblingAxis(holder.getReader()));
    assertEquals(false, builder.isOrdered());
    builder = new ExpressionSingle();
    builder.add(new UnionAxis(holder.getReader(), new DescendantAxis(holder.getReader()), new ParentAxis(holder.getReader())));
    assertEquals(false, builder.isOrdered());
    assertTrue(builder.getExpr() instanceof DupFilterAxis);
}

Example 3 with UnionAxis

use of org.sirix.service.xml.xpath.expr.UnionAxis in project sirix by sirixdb.

the class PipelineBuilder method addUnionExpression.

/**
 * Adds a union expression to the pipeline.
 *
 * @param mTransaction Transaction to operate with.
 */
public void addUnionExpression(final XdmNodeReadTrx mTransaction) {
    assert getPipeStack().size() >= 2;
    final Axis mOperand2 = getPipeStack().pop().getExpr();
    final Axis mOperand1 = getPipeStack().pop().getExpr();
    if (getPipeStack().empty() || getExpression().getSize() != 0) {
        addExpressionSingle();
    }
    getExpression().add(new DupFilterAxis(mTransaction, new UnionAxis(mTransaction, mOperand1, mOperand2)));
}