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The XSLT and XQuery Processor

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2015 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.trace;

import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.StaticContext;
import net.sf.saxon.om.StructuredQName;

/**
 * A code injector that wraps every expression (other than a literal) in a TraceExpression, which causes
 * a TraceListener to be notified when the expression is evaluated
 */
public class XSLTTraceCodeInjector extends TraceCodeInjector {

    /**
     * If tracing, wrap an expression in a trace instruction
     *
     * @param exp       the expression to be wrapped
     * @param env       the static context
     * @param construct integer constant identifying the kind of construct
     * @param qName     the name of the construct (if applicable)
     * @return the expression that does the tracing
     */

    public Expression inject(Expression exp, /*@NotNull*/ StaticContext env, int construct, StructuredQName qName) {
        if (XSLTTraceListener.tagName(construct) != null) {
            return super.inject(exp, env, construct, qName);
        } else {
            return exp;
        }
    }
}