scriptella.driver.xpath

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Java Source Code / Java Documentation » Scripting » scriptella » scriptella.driver.xpath

XPath Driver for Scriptella.

Allows querying an XML file based on XPath expressions.

General information

Driver class:	`scriptella.driver.xpath.Driver`
URL:	`XML file URL. URIs are resolved relative to a script file directory.`
Runtime dependencies:	`None`

Driver Specific Properties

Name	Description	Required
trim	Value of `true` specifies that the leading and trailing whitespaces in text file lines should be omitted..	No, the default value is `true`.

Query Syntax

XPath driver supports XPath syntax to query text files.

The query is executed on a XML Document and produces a rowset for matched nodes. The attribute and element values can be referenced from nested scripts/queries. The following example illustrates querying mechanism:

Example:

XPath: /A selects root element <A>

<A B="1">
    <B>2</B>
    <C>3</C>
</A>

Available variables for matched element <A>:

Name	Value
A	2 3
B	1
C	3

The value of variable A represents text content inside XML element <A>, the value of variable B represents value of B attribute and the value of variable C represents text content inside element <C>.

Additional notes:

Currently only Node Set can be selected in XPath expressions, i.e. attributes or elements but not String, Boolean or Number

Script Syntax

Properties substitution

In query elements ${property} or $property syntax is used for properties/variables substition.

Examples

<connection id="in" driver="xpath" url="data.xml"/>
<connection id="out" driver="text" url="report.csv"/>

<query connection-id="in">
    /HTML/BODY/TABLE/TR
    <script connection-id="out">
        $rownum;${td[0]};${td[1]}
    </script>
</query>

Extracts rows from tables in data.xml file and produces report.csv.

Java Source File Name Type Comment

Driver.java Class Represents a driver for querying XML files with XPath expressions.

XPathConnection.java Class Represents a connection to an XML file.

XPathConnectionPerfTest.java Class Tests for scriptella.driver.xpath.XPathConnection .

XPathDriverITest.java Class Integration test for scriptella.driver.xpath.Driver XPath driver .

XPathExpressionCompiler.java Class Represents a facade for compiling xpath expressions.

XPathProviderException.java Class Thrown to indicate a problem with XML file querying.

XPathQueryExecutor.java Class Executor for XPath queries.

XPathQueryExecutorTest.java Class Tests for XPathQueryExecutor .

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