Package net.sf.saxon.xpath

## Class XPathFactoryImpl

- java.lang.Object
- - javax.xml.xpath.XPathFactory
  - - net.sf.saxon.xpath.XPathFactoryImpl

- All Implemented Interfaces:
    `Configuration.ApiProvider`
  Direct Known Subclasses:
    `EnterpriseXPathFactory`, `ProfessionalXPathFactory`

      public class XPathFactoryImpl
      extends javax.xml.xpath.XPathFactory
      implements Configuration.ApiProvider

  Saxon implementation of the JAXP 1.3 XPathFactory

- - ### Field Summary

    - ### Fields inherited from class javax.xml.xpath.XPathFactory

      `DEFAULT_OBJECT_MODEL_URI, DEFAULT_PROPERTY_NAME`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `XPathFactoryImpl()` | Default constructor: this creates a Configuration as well as creating the XPathFactory.
    `XPathFactoryImpl​(Configuration config)` | Constructor using a user-supplied Configuration.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `Configuration` | `getConfiguration()` | Get the Configuration object used by this XPathFactory
    `boolean` | `getFeature​(java.lang.String feature)` | Get a feature of this XPath implementation.
    `boolean` | `isObjectModelSupported​(java.lang.String model)` | Test whether a given object model is supported.
    `javax.xml.xpath.XPath` | `newXPath()` | Create an XPath evaluator
    `void` | `setConfiguration​(Configuration config)` | Set the Configuration for the factory
    `void` | `setFeature​(java.lang.String feature, boolean b)` | Set a feature of this XPath implementation.
    `void` | `setXPathFunctionResolver​(javax.xml.xpath.XPathFunctionResolver xPathFunctionResolver)` | Set a resolver for XPath functions.
    `void` | `setXPathVariableResolver​(javax.xml.xpath.XPathVariableResolver xPathVariableResolver)` | Set a resolver for XPath variables.

    - ### Methods inherited from class javax.xml.xpath.XPathFactory

      `newDefaultInstance, newInstance, newInstance, newInstance`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### XPathFactoryImpl

          public XPathFactoryImpl()

      Default constructor: this creates a Configuration as well as creating the XPathFactory. Any documents accessed using this XPathFactory must be built using this same Configuration.

    - #### XPathFactoryImpl

          public XPathFactoryImpl​(Configuration config)

      Constructor using a user-supplied Configuration. This constructor is useful if the document to be queried already exists, as it allows the configuration associated with the document to be used with this XPathFactory.
      Parameters:
        `config` - the Saxon configuration

  - ### Method Detail

    - #### setConfiguration

          public void setConfiguration​(Configuration config)

      Set the Configuration for the factory
      Parameters:
        `config` - the Saxon Configuration to be used

    - #### getConfiguration

          public Configuration getConfiguration()

      Get the Configuration object used by this XPathFactory
      Returns:
        the Saxon configuration

    - #### isObjectModelSupported

          public boolean isObjectModelSupported​(java.lang.String model)

      Test whether a given object model is supported. Returns true if the object model is the Saxon object model, DOM, JDOM, DOM4J, or XOM
      Specified by:
        `isObjectModelSupported` in class `javax.xml.xpath.XPathFactory`
      Parameters:
        `model` - The URI identifying the object model.
      Returns:
        true if the object model is one of the following (provided that the supporting JAR file is available on the classpath) `NamespaceConstant.OBJECT_MODEL_SAXON`, `XPathConstants.DOM_OBJECT_MODEL`, `NamespaceConstant.OBJECT_MODEL_JDOM`, or `NamespaceConstant.OBJECT_MODEL_XOM`, or `NamespaceConstant.OBJECT_MODEL_DOM4J`. Saxon also allows user-defined external object models to be registered with the Configuration, and this method will return true in respect of any such model.

    - #### setFeature

          public void setFeature​(java.lang.String feature,
                                 boolean b)
                          throws javax.xml.xpath.XPathFactoryConfigurationException

      Set a feature of this XPath implementation. The features currently recognized are:
      - `XMLConstants.FEATURE_SECURE_PROCESSING`
      - `FeatureKeys.SCHEMA_VALIDATION`: requests schema validation of source documents. The property is rejected if the configuration is not schema-aware.

      In addition, any Saxon configuration feature (listed in `FeatureKeys` can be used provided the value is a boolean. (For non-boolean configuration properties, drop down to the underlying Saxon `Configuration` object and call `setConfigurationProperty()`)

      Specified by:
        `setFeature` in class `javax.xml.xpath.XPathFactory`
      Parameters:
        `feature` - a URI identifying the feature
        `b` - true to set the feature on, false to set it off
      Throws:
        `javax.xml.xpath.XPathFactoryConfigurationException` - if the feature name is not recognized

    - #### getFeature

          public boolean getFeature​(java.lang.String feature)
                             throws javax.xml.xpath.XPathFactoryConfigurationException

      Get a feature of this XPath implementation. The only features currently recognized are:
      - `FEATURE_SECURE_PROCESSING`
      - `FeatureKeys.SCHEMA_VALIDATION`: requests schema validation of source documents.

      In addition, any Saxon configuration feature (listed in `FeatureKeys` can be used provided the value is a boolean. (For non-boolean configuration properties, drop down to the underlying Saxon `Configuration` object and call `getConfigurationProperty()`)

      Specified by:
        `getFeature` in class `javax.xml.xpath.XPathFactory`
      Parameters:
        `feature` - a URI identifying the feature
      Returns:
        true if the feature is on, false if it is off
      Throws:
        `javax.xml.xpath.XPathFactoryConfigurationException` - if the feature name is not recognized

    - #### setXPathVariableResolver

          public void setXPathVariableResolver​(javax.xml.xpath.XPathVariableResolver xPathVariableResolver)

      Set a resolver for XPath variables. This will be used to obtain the value of any variable referenced in an XPath expression. The variable resolver must be allocated before the expression is compiled, but it will only be called when the expression is evaluated.
      Specified by:
        `setXPathVariableResolver` in class `javax.xml.xpath.XPathFactory`
      Parameters:
        `xPathVariableResolver` - The object used to resolve references to variables.

    - #### setXPathFunctionResolver

          public void setXPathFunctionResolver​(javax.xml.xpath.XPathFunctionResolver xPathFunctionResolver)

      Set a resolver for XPath functions. This will be used to obtain an implementation of any external function referenced in an XPath expression. This is not required for system functions, Saxon extension functions, constructor functions named after types, or extension functions bound using a namespace that maps to a Java class.
      Specified by:
        `setXPathFunctionResolver` in class `javax.xml.xpath.XPathFactory`
      Parameters:
        `xPathFunctionResolver` - The object used to resolve references to external functions.

    - #### newXPath

          public javax.xml.xpath.XPath newXPath()

      Create an XPath evaluator
      Specified by:
        `newXPath` in class `javax.xml.xpath.XPathFactory`
      Returns:
        an XPath object, which can be used to compile and execute XPath expressions.