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An OSGi bundle for Saxon-HE
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 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.style;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.Literal;
import net.sf.saxon.expr.instruct.Choose;
import net.sf.saxon.expr.instruct.Executable;
import net.sf.saxon.om.AttributeCollection;
import net.sf.saxon.om.AxisInfo;
import net.sf.saxon.om.GroundedValue;
import net.sf.saxon.om.StandardNames;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.value.BooleanValue;
/**
* Handler for xsl:if elements in stylesheet.
* The xsl:if element has a mandatory attribute test, a boolean expression.
* The content is output if the test condition is true.
*/
public class XSLIf extends StyleElement {
/*@Nullable*/ private Expression test;
/**
* Determine whether this node is an instruction.
* @return true - it is an instruction
*/
public boolean isInstruction() {
return true;
}
/**
* Determine the type of item returned by this instruction (only relevant if
* it is an instruction).
* @return the item type returned
*/
protected ItemType getReturnedItemType() {
return getCommonChildItemType();
}
/**
* Determine whether this type of element is allowed to contain a template-body
* @return true: yes, it may contain a template-body
*/
public boolean mayContainSequenceConstructor() {
return true;
}
public void prepareAttributes() throws XPathException {
test = prepareTestAttribute(this);
if (test==null) {
reportAbsence("test");
}
}
/**
* Process all the attributes, for an element where the only permitted attribute is "test"
* @param se the containing element
* @return the expression represented by the test attribute, or null if the attribute is absent
* @throws XPathException if an error is encountered
*/
public static Expression prepareTestAttribute(StyleElement se) throws XPathException {
String testAtt=null;
AttributeCollection atts = se.getAttributeList();
for (int a=0; a