Package org.apache.jackrabbit.commons

Class NamespaceHelper

  • public class NamespaceHelper
extends java.lang.Object
    Helper class for working with JCR namespaces.
    Since:
    Jackrabbit JCR Commons 1.5

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String JCR
      The jcr namespace URI.
      static java.lang.String MIX
      The mix namespace URI.
      static java.lang.String NT
      The nt namespace URI.

    • Constructor Summary

      Constructors 
      Constructor Description
      NamespaceHelper​(Session session)
      Creates a namespace helper for the given session.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.String getJcrName​(java.lang.String name)
      Replaces the standard jcr, nt, or mix prefix in the given name with the prefix mapped to that namespace in the current session.
      java.lang.String getJcrName​(java.lang.String uri, java.lang.String name)
      Returns the prefixed JCR name for the given namespace URI and local name in the current session.
      java.util.Map<java.lang.String,​java.lang.String> getNamespaces()
      Returns a map containing all prefix to namespace URI mappings of the current session.
      java.lang.String getPrefix​(java.lang.String uri)
      Returns the prefix mapped to the given namespace URI in the current session, or null if the namespace does not exist.
      java.lang.String getURI​(java.lang.String prefix)
      Returns the namespace URI mapped to the given prefix in the current session, or null if the namespace does not exist.
      java.lang.String registerNamespace​(java.lang.String prefix, java.lang.String uri)
      Safely registers the given namespace.
      void registerNamespaces​(java.util.Map<java.lang.String,​java.lang.String> namespaces)
      Safely registers all namespaces in the given map from prefixes to namespace URIs.

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • NamespaceHelper

        public NamespaceHelper​(Session session)
        Creates a namespace helper for the given session.
        Parameters:
        session - current session

    • Method Detail

      • getNamespaces

        public java.util.Map<java.lang.String,​java.lang.String> getNamespaces()
                                                                     throws RepositoryException
        Returns a map containing all prefix to namespace URI mappings of the current session. The returned map is newly allocated and can can be freely modified by the caller.
        Returns:
        namespace mappings
        Throws:
        RepositoryException - if the namespaces could not be retrieved
        See Also:
        Session.getNamespacePrefixes()

      • getPrefix

        public java.lang.String getPrefix​(java.lang.String uri)
                           throws RepositoryException
        Returns the prefix mapped to the given namespace URI in the current session, or null if the namespace does not exist.
        Parameters:
        uri - namespace URI
        Returns:
        namespace prefix, or null
        Throws:
        RepositoryException - if the namespace could not be retrieved
        See Also:
        Session.getNamespacePrefix(String)

      • getURI

        public java.lang.String getURI​(java.lang.String prefix)
                        throws RepositoryException
        Returns the namespace URI mapped to the given prefix in the current session, or null if the namespace does not exist.
        Parameters:
        prefix - namespace prefix
        Returns:
        namespace prefix, or null
        Throws:
        RepositoryException - if the namespace could not be retrieved
        See Also:
        Session.getNamespaceURI(String)

      • getJcrName

        public java.lang.String getJcrName​(java.lang.String uri,
                                   java.lang.String name)
                            throws NamespaceException,
                                   RepositoryException
        Returns the prefixed JCR name for the given namespace URI and local name in the current session.
        Parameters:
        uri - namespace URI
        name - local name
        Returns:
        prefixed JCR name
        Throws:
        NamespaceException - if the namespace does not exist
        RepositoryException - if the namespace could not be retrieved

      • getJcrName

        public java.lang.String getJcrName​(java.lang.String name)
                            throws java.lang.IllegalArgumentException,
                                   RepositoryException
        Replaces the standard jcr, nt, or mix prefix in the given name with the prefix mapped to that namespace in the current session.

        The purpose of this method is to make it easier to write namespace-aware code that uses names in the standard JCR namespaces. For example: 

             node.getProperty(helper.getName("jcr:data"));
        Parameters:
        name - prefixed name using the standard JCR prefixes
        Returns:
        prefixed name using the current session namespace mappings
        Throws:
        java.lang.IllegalArgumentException - if the prefix is unknown
        RepositoryException - if the namespace could not be retrieved

      • registerNamespace

        public java.lang.String registerNamespace​(java.lang.String prefix,
                                          java.lang.String uri)
                                   throws RepositoryException
        Safely registers the given namespace. If the namespace already exists, then the prefix mapped to the namespace in the current session is returned. Otherwise the namespace is registered to the namespace registry. If the given prefix is already registered for some other namespace or otherwise invalid, then another prefix is automatically generated. After the namespace has been registered, the prefix mapped to it in the current session is returned.
        Parameters:
        prefix - namespace prefix
        uri - namespace URI
        Returns:
        namespace prefix in the current session
        Throws:
        RepositoryException - if the namespace could not be registered
        See Also:
        NamespaceRegistry.registerNamespace(String, String)

      • registerNamespaces

        public void registerNamespaces​(java.util.Map<java.lang.String,​java.lang.String> namespaces)
                        throws RepositoryException
        Safely registers all namespaces in the given map from prefixes to namespace URIs.
        Parameters:
        namespaces - namespace mappings
        Throws:
        RepositoryException - if the namespaces could not be registered