Examples of net.sf.saxon.query.XQueryExpression.evaluateSingle()

Class net.sf.saxon.query.XQueryExpression

Examples of net.sf.saxon.query.XQueryExpression.evaluateSingle()

net.sf.saxon.query.XQueryExpression.evaluateSingle()
Execute the compiled Query, returning the first item in the result. This is useful where it is known that the expression will only return a singleton value (for example, a single node, or a boolean). @param env Provides the dynamic query evaluation context @return The first item in the sequence returned by the expression. If the expressionreturns an empty sequence, this method returns null. Otherwise, it returns the first item in the result sequence, represented as a Java object using the same mapping as for the {@link XQueryExpression#evaluate evaluate} method

        final NodeInfo doc = (NodeInfo)exp1.evaluateSingle(dynamicContext);


        // Run the second query
        dynamicContext.clearParameters();
        dynamicContext.setContextItem(doc);
        final Object result = exp2.evaluateSingle(dynamicContext);
        System.out.println("3*3 + 5 = " + result);
        // The result is actually a java.lang.Double
    }


    /**

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        final Configuration config = new Configuration();
        final StaticQueryContext sqc = new StaticQueryContext(config);
        final XQueryExpression exp = sqc.compileQuery("avg(for $i in 1 to 10 return $i*$i)");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final BigDecimal result = (BigDecimal)exp.evaluateSingle(dynamicContext);
        System.out.println(result);


    }


    /**

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        final XQueryExpression exp = sqc.compileQuery("declare variable $in as xs:integer external;" +
                "$in * $in");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        dynamicContext.setParameter("in", new Long(17));
        final Long result = (Long)exp.evaluateSingle(dynamicContext);
        System.out.println("17 * 17 = " + result);


    }


    /**

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        final NodeInfo doc = (NodeInfo)exp1.evaluateSingle(dynamicContext);


        // Run the second query
        dynamicContext.clearParameters();
        dynamicContext.setContextNode(doc);
        final Object result = exp2.evaluateSingle(dynamicContext);
        System.out.println("3*3 + 5 = " + result);
        // The result is actually a java.lang.Double
    }


    /**

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