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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.fo;
-
- import java.util.HashMap;
-
- import javax.xml.parsers.DocumentBuilderFactory;
- import javax.xml.parsers.ParserConfigurationException;
-
- import org.w3c.dom.DOMImplementation;
-
- import org.apache.xmlgraphics.util.QName;
-
- /**
- * Abstract base class for Element Mappings (including FO Element Mappings)
- * which provide the framework of valid elements and attibutes for a given
- * namespace.
- */
- public abstract class ElementMapping {
- /** constant for defining the default value */
- public static final String DEFAULT = "<default>";
-
- /** The HashMap table of formatting objects defined by the ElementMapping */
- protected HashMap foObjs = null;
-
- /** The namespace for the ElementMapping */
- protected String namespaceURI = null;
-
- /**
- * Returns a HashMap of maker objects for this element mapping
- *
- * @return Table of Maker objects for this ElementMapping
- */
- public HashMap getTable() {
- if (foObjs == null) {
- initialize();
- }
- return foObjs;
- }
-
- /**
- * Returns the namespace URI for this element mapping
- *
- * @return Namespace URI for this element mapping
- */
- public String getNamespaceURI() {
- return namespaceURI;
- }
-
- /**
- * Returns the DOMImplementation used by this ElementMapping. The value returned may be null
- * for cases where no DOM is used to represent the element tree (XSL-FO, for example). This
- * method is used by the intermediate format to instantiate the right kind of DOM document
- * for foreign objects. For example, SVG handled through Apache Batik has to use a special
- * DOMImplementation.
- * @return the DOMImplementation used by this ElementMapping, may be null
- */
- public DOMImplementation getDOMImplementation() {
- return null; //For namespaces not used in foreign objects
- }
-
- /**
- * @return the default DOMImplementation when no specialized DOM is necessary.
- */
- public static DOMImplementation getDefaultDOMImplementation() {
- DocumentBuilderFactory fact = DocumentBuilderFactory.newInstance();
- fact.setNamespaceAware(true);
- fact.setValidating(false);
- try {
- return fact.newDocumentBuilder().getDOMImplementation();
- } catch (ParserConfigurationException e) {
- throw new RuntimeException(
- "Cannot return default DOM implementation: " + e.getMessage());
- }
- }
-
- /** @return the standard namespace prefix for this namespace or null if it is not known. */
- public String getStandardPrefix() {
- return null;
- }
-
- /**
- * Indicates whether a particular attribute of the namespace is a property, i.e. the attribute
- * value should be converted to a property value.
- * @param attributeName the attribute name
- * @return true if the attribute should be converted to a property
- */
- public boolean isAttributeProperty(QName attributeName) {
- return false;
- }
-
- /**
- * Initializes the set of maker objects associated with this ElementMapping
- */
- protected abstract void initialize();
-
- /**
- * Base class for all Makers. It is responsible to return the right kind of FONode for a
- * particular element.
- */
- public static class Maker {
-
- /**
- * Creates a new FONode (or rather a specialized subclass of it).
- * @param parent the parent FONode
- * @return the newly created FONode instance
- */
- public FONode make(FONode parent) {
- return null;
- }
- }
- }
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