XML:DB API

org.xmldb.api.modules
Interface XPathQueryService

All Superinterfaces:
Configurable, Service

public interface XPathQueryService
extends Service

XPathQueryService is a Service that enables the execution of XPath queries within the context of a Collection or against a single XML Resource stored in the Collection.


Field Summary
static java.lang.String SERVICE_NAME
           
 
Method Summary
 void clearNamespaces()
          Removes all namespace mappings stored in the internal namespace map.
 java.lang.String getNamespace(java.lang.String prefix)
          Returns the URI string associated with prefix from the internal namespace map.
 ResourceSet query(java.lang.String query)
          Run an XPath query against the Collection.
 ResourceSet queryResource(java.lang.String id, java.lang.String query)
          Run an XPath query against an XML resource stored in the Collection associated with this service.
 void removeNamespace(java.lang.String prefix)
          Removes the namespace mapping associated with prefix from the internal namespace map.
 void setNamespace(java.lang.String prefix, java.lang.String uri)
          Sets a namespace mapping in the internal namespace map used to evaluate queries.
 
Methods inherited from interface org.xmldb.api.base.Service
getName, getVersion, setCollection
 
Methods inherited from interface org.xmldb.api.base.Configurable
getProperty, setProperty
 

Field Detail

SERVICE_NAME

static final java.lang.String SERVICE_NAME
See Also:
Constant Field Values
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 - with expected error codes.
ErrorCodes.VENDOR_ERROR for any vendor specific errors that occur.
TODO: probably need some special error here.

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.

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
Removes all namespace mappings stored in the internal namespace map.

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
Run an XPath query against the Collection. The XPath will be applied to all XML resources stored in the Collection. The result is a ResourceSet containing the results of the query. Any namespaces used in the query string will be evaluated using the mappings setup using setNamespace.

Parameters:
query - The XPath query string to use.
Returns:
A ResourceSet containing the results of the query.
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
Run an XPath query against an XML resource stored in the Collection associated with this service. The result is a ResourceSet containing the results of the query. Any namespaces used in the query string will be evaluated using the mappings setup using setNamespace.

Parameters:
query - The XPath query string to use.
id - The id of the document to run the query against.
Returns:
A ResourceSet containing the results of the query.
Throws:
XMLDBException - with expected error codes.
ErrorCodes.VENDOR_ERROR for any vendor specific errors that occur.

XML:DB API

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