net.sf.saxon.pattern.ConditionalPattern Maven / Gradle / Ivy
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2013 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
package net.sf.saxon.pattern;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.MultiIterator;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.expr.instruct.Executable;
import net.sf.saxon.expr.instruct.SlotManager;
import net.sf.saxon.expr.parser.ExpressionTool;
import net.sf.saxon.expr.parser.ExpressionVisitor;
import net.sf.saxon.expr.parser.PromotionOffer;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.iter.SingletonIterator;
import net.sf.saxon.tree.iter.UnfailingIterator;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.type.Type;
import java.util.Arrays;
import java.util.Iterator;
/**
* A ConditionalPattern tests a node against one of a number of patterns depending on the value of a condition.
* This is used only as a streaming selection.
*/
public class ConditionalPattern extends Pattern {
private Expression[] conditions;
private Pattern[] patterns;
public ConditionalPattern(Expression[] conditions, Pattern[] patterns) {
this.conditions = conditions;
this.patterns = patterns;
}
/**
* Set the executable containing this pattern
*
* @param executable the executable
*/
public void setExecutable(Executable executable) {
for (int i=0; iUnlike the corresponding method on {@link net.sf.saxon.expr.Expression}, this method does not return anything:
* it can make internal changes to the pattern, but cannot return a different pattern. Only certain
* kinds of promotion are applicable within a pattern: specifically, promotions affecting local
* variable references within the pattern.
* @param offer details of the offer, for example the offer to move
* expressions that don't depend on the context to an outer level in
* the containing expression
* @param parent
* @throws net.sf.saxon.trans.XPathException
* if any error is detected
*/
public void promote(PromotionOffer offer, Expression parent) throws XPathException {
for (int i=0; i