Package org.apache.cocoon.xml.sax

Class NamespacesTable

java.lang.Object
org.apache.cocoon.xml.sax.NamespacesTable
@Deprecated(since="2022-01-27") public class NamespacesTable extends Object
Deprecated.
This API is deprecated, migrate code to the XML APIs provided by the JDK.
Keeps track of namespaces declarations and resolve namespaces names.

This class also provides a very convenient and safe way of handling namespace declarations in SAX pipes. It also allows to filter duplicate namespace declarations that too often clutter up XML documents that went through several transformations, and avoid useless namespace declarations that aren't followed by element events.

Usage example in a SAX pipe: 

    NamespacesTable namespaces = new NamespacesTable();
    ContentHandler nextHandler;

    public void startPrefixMapping(String prefix, String uri) throws SAXException {
        namespaces.addDeclaration(prefix, uri);
    }

    public void startElement(...) throws SAXException {
        // automatically start mappings for this scope
        namespaces.enterScope(nextHandler);
        nextHandler.startElement(...);
    }

    public void endElement(...) throws SAXException {
        nextHandler.endElement(...);
        // automatically end mappings for this scope
        namespaces.leaveScope(nextHandler);
    }

    public void endPrefixMapping(String prefix) throws SAXException {
        // Ignore, it is handled by leaveScope()
    }

  • Constructor Details

    • NamespacesTable

      public NamespacesTable()
      Deprecated.
      Construct a new NamespacesTable instance.

  • Method Details

    • clear

      public void clear()
      Deprecated.
      Clear and reinitialize this namespace table before reuse.
      Since:
      2.1.8

    • addDeclaration

      public NamespacesTable.Declaration addDeclaration(String prefix, String uri)
      Deprecated.
      Declare a new namespace prefix-uri mapping.
      Returns:
      The newly added Declaration.

    • removeDeclaration

      public NamespacesTable.Declaration removeDeclaration(String prefix)
      Deprecated.
      Undeclare a namespace prefix-uri mapping. If the prefix was previously declared mapping another URI, its value is restored.

      When using enterScope()/leaveScope(), this method does nothing and always returns null, as declaration removal is handled in leaveScope().

      Returns:
      the removed Declaration or null.

    • enterScope

      public void enterScope()
      Deprecated.
      Enter a new scope. This starts a new, empty list of declarations for the new scope.

      Typically called in a SAX handler before sending a startElement() event.

      Since:
      2.1.8

    • enterScope

      public void enterScope(ContentHandler handler) throws SAXException
      Deprecated.
      Start all declared mappings of the current scope and enter a new scope. This starts a new, empty list of declarations for the new scope.

      Typically called in a SAX handler before sending a startElement() event.

      Parameters:
      handler - the handler that will receive startPrefixMapping events.
      Throws:
      SAXException
      Since:
      2.1.8

    • leaveScope

      public void leaveScope()
      Deprecated.
      Leave a scope. The namespace declarations that occured before the corresponding enterScope() are no more visible using the resolution methods, but still available using getCurrentScopeDeclarations() until the next call to addDeclaration(String, String) or enterScope().

      Typically called in a SAX handler after sending a endElement() event.

      Since:
      2.1.8

    • leaveScope

      public void leaveScope(ContentHandler handler) throws SAXException
      Deprecated.
      Leave a scope. The namespace declarations that occured before the corresponding enterScope() are no more visible using the resolution methods, but still available using getCurrentScopeDeclarations() until the next call to addDeclaration(String, String) or enterScope().

      Typically called in a SAX handler after sending a endElement() event.

      Parameters:
      handler - the handler that will receive endPrefixMapping events.
      Throws:
      SAXException
      Since:
      2.1.8

    • getCurrentScopeDeclarations

      public NamespacesTable.Declaration[] getCurrentScopeDeclarations()
      Deprecated.
      Get the declarations that were declared within the current scope.
      Returns:
      the declarations (possibly empty, but never null)
      Since:
      2.1.8

    • getUri

      public String getUri(String prefix)
      Deprecated.
      Return the URI associated with the given prefix or null if the prefix was not mapped.

    • getPrefixes

      public String[] getPrefixes(String uri)
      Deprecated.
      Return an array with all prefixes currently mapped to the specified URI.
      The array length might be zero if no prefixes are associated with the specified uri.
      Returns:
      A non-null String array.

    • getPrefix

      public String getPrefix(String uri)
      Deprecated.
      Return one of the prefixes currently mapped to the specified URI or null.

    • resolve

      public NamespacesTable.Name resolve(String uri, String raw, String prefix, String local) throws SAXException
      Deprecated.
      Resolve a namespace-aware name against the current namespaces declarations.
      Parameters:
      uri - The namespace URI or null if not known.
      raw - The raw (complete) name or null if not known.
      prefix - The namespace prefix or null if not known.
      local - The local name or null if not known.
      Returns:
      A non-null Name.
      Throws:
      SAXException - If the name cannot be resolved.