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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 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.functions;
import net.sf.saxon.expr.Callable;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.StaticProperty;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.om.SequenceTool;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.AnyURIValue;
/**
* This class implements the XSLT 3.0 function current-output-uri()
*/
public class CurrentOutputUri extends SystemFunction implements Callable {
/**
* Determine the special properties of this function. The general rule
* is that a system function call is non-creative if its return type is
* atomic, or if all its arguments are non-creative. This is overridden
* for the generate-id() function, which is considered creative if
* its operand is creative (because the result depends on the
* identity of the operand)
* @param arguments the actual arguments to the function call
*/
@Override
public int getSpecialProperties(Expression[] arguments) {
// Prevent inlining of stylesheet functions calling current-output-uri()
return super.getSpecialProperties(arguments) | StaticProperty.HAS_SIDE_EFFECTS;
}
/**
* Evaluate in a general context
*/
public AnyURIValue evaluateItem(XPathContext context) throws XPathException {
String uri = context.getCurrentOutputUri();
return uri == null ? null : new AnyURIValue(uri);
}
/**
* Call the Callable.
*
* @param context the dynamic evaluation context
* @param arguments the values of the arguments, supplied as Sequences.
* Generally it is advisable, if calling iterate() to process a supplied sequence, to
* call it only once; if the value is required more than once, it should first be converted
* to a {@link net.sf.saxon.om.GroundedValue} by calling the utility methd
* SequenceTool.toGroundedValue().
* If the expected value is a single item, the item should be obtained by calling
* Sequence.head(): it cannot be assumed that the item will be passed as an instance of
* {@link net.sf.saxon.om.Item} or {@link net.sf.saxon.value.AtomicValue}.
* It is the caller's responsibility to perform any type conversions required
* to convert arguments to the type expected by the callee. An exception is where
* this Callable is explicitly an argument-converting wrapper around the original
* Callable.
* @return the result of the evaluation, in the form of a Sequence. It is the responsibility
* of the callee to ensure that the type of result conforms to the expected result type.
* @throws net.sf.saxon.trans.XPathException
* if a dynamic error occurs during the evaluation of the expression
*/
@Override
public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException {
return SequenceTool.itemOrEmpty(evaluateItem(context));
}
}