Package org.xmldb.api.modules

Interface XQueryService

    • Method Detail

      • setNamespace

        void setNamespace​(java.lang.String prefix,
                  java.lang.String uri)
           throws XMLDBException
        Sets a namespace mapping in the internal namespace map used to evaluate queries. If prefix is null or empty the default namespace is associated with the provided URI. A null or empty uri results in an exception being thrown.
        Parameters:
        prefix - The prefix to set in the map. If prefix is empty or null the default namespace will be associated with the provided URI.
        uri - The URI for the namespace to be associated with prefix.
        Throws:
        XMLDBException - if an error occurs whilst setting the namespace.

      • getNamespace

        java.lang.String getNamespace​(java.lang.String prefix)
                       throws XMLDBException
        Returns the URI string associated with prefix from the internal namespace map. If prefix is null or empty the URI for the default namespace will be returned. If a mapping for the prefix can not be found null is returned.
        Parameters:
        prefix - The prefix to retrieve from the namespace map.
        Returns:
        The URI associated with prefix
        Throws:
        XMLDBException - with expected error codes. ErrorCodes.VENDOR_ERROR for any vendor specific errors that occur.
        XMLDBException - if an error occurs whilst getting the namespace.

      • removeNamespace

        void removeNamespace​(java.lang.String prefix)
              throws XMLDBException
        Removes the namespace mapping associated with prefix from the internal namespace map. If prefix is null or empty the mapping for the default namespace will be removed.
        Parameters:
        prefix - The prefix to remove from the namespace map. If prefix is null or empty the mapping for the default namespace will be removed.
        Throws:
        XMLDBException - with expected error codes. ErrorCodes.VENDOR_ERROR for any vendor specific errors that occur.

      • clearNamespaces

        void clearNamespaces()
              throws XMLDBException
        Clears all namespace mappings defined.
        Throws:
        XMLDBException - with expected error codes. ErrorCodes.VENDOR_ERROR for any vendor specific errors that occur.

      • query

        ResourceSet query​(java.lang.String query)
           throws XMLDBException
        Executes the given query and returns the result as a resource set.
        Parameters:
        query - The query to be executed
        Returns:
        The query result
        Throws:
        XMLDBException - with expected error codes. ErrorCodes.VENDOR_ERROR for any vendor specific errors that occur.

      • queryResource

        ResourceSet queryResource​(java.lang.String id,
                          java.lang.String query)
                   throws XMLDBException
        Executes the given query and returns the result as a resource set.
        Parameters:
        id - The id of a resource
        query - The query to be executed
        Returns:
        The query result
        Throws:
        XMLDBException - with expected error codes. ErrorCodes.VENDOR_ERROR for any vendor specific errors that occur.

      • execute

        ResourceSet execute​(CompiledExpression expression)
             throws XMLDBException
        Execute a compiled XQuery. The implementation should pass all namespaces and variables declared through XQueryService to the compiled XQuery code.
        Parameters:
        expression - the compiled query expression
        Returns:
        the result of the query
        Throws:
        XMLDBException - if an error occurs whilst executing the query.

      • declareVariable

        void declareVariable​(java.lang.String qname,
                     java.lang.Object initialValue)
              throws XMLDBException
        Declare a global, external XQuery variable and assign a value to it. The variable has the same status as a variable declare through the declare variable statement in the XQuery prolog. The variable can be referenced inside the XQuery expression as $variable. For example, if you declare a variable with 
         declareVariable("name", "HAMLET");
        you may use the variable in an XQuery expression as follows: 
         // SPEECH[SPEAKER=$name]
        Parameters:
        qname - a valid QName by which the variable is identified. Any prefix should have been mapped to a namespace, using setNamespace(String, String). For example, if a variable is called x:name, a prefix/namespace mapping should have been defined for prefix x before calling this method.
        initialValue - the initial value, which is assigned to the variable
        Throws:
        XMLDBException - if an error occurs whilst declaring the variable.

      • setXPathCompatibility

        void setXPathCompatibility​(boolean backwardsCompatible)
        Enable or disable XPath 1.0 compatibility mode. In XPath 1.0 compatibility mode, some XQuery expressions will behave different. In particular, additional automatic type conversions will be applied to the operands of numeric operators.
        Parameters:
        backwardsCompatible - true it XPath 1.0 compatibility mode should be enabled.

      • setModuleLoadPath

        void setModuleLoadPath​(java.lang.String path)
        Sets the new module load path.
        Parameters:
        path - The module load path to be set.