org.apache.batik.bridge.svg12.AbstractContentSelector Maven / Gradle / Ivy
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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
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http://www.apache.org/licenses/LICENSE-2.0
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See the License for the specific language governing permissions and
limitations under the License.
*/
package org.apache.batik.bridge.svg12;
import java.util.HashMap;
import org.apache.batik.anim.dom.XBLOMContentElement;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* A base class for handlers of different XBL content element includes
* attribute syntaxes.
*
* @author Cameron McCormack
* @version $Id: AbstractContentSelector.java 1733416 2016-03-03 07:07:13Z gadams $
*/
public abstract class AbstractContentSelector {
/**
* The ContentManager object that owns this selector.
*/
protected ContentManager contentManager;
/**
* The XBL content element.
*/
protected XBLOMContentElement contentElement;
/**
* The bound element.
*/
protected Element boundElement;
/**
* Creates a new AbstractContentSelector object.
*/
public AbstractContentSelector(ContentManager cm,
XBLOMContentElement content,
Element bound) {
contentManager = cm;
contentElement = content;
boundElement = bound;
}
/**
* Returns a list of nodes that were matched by this selector.
*/
public abstract NodeList getSelectedContent();
/**
* Forces this selector to update its selected nodes list.
* Returns true if the selected node list needed updating.
* This assumes that the previous content elements in this
* shadow tree (in document order) have up-to-date selectedContent
* lists.
*/
abstract boolean update();
/**
* Returns true if the given node has already been selected
* by a content element.
*/
protected boolean isSelected(Node n) {
return contentManager.getContentElement(n) != null;
}
/**
* Map of selector languages to factories.
*/
protected static HashMap selectorFactories = new HashMap();
static {
ContentSelectorFactory f1 = new XPathPatternContentSelectorFactory();
ContentSelectorFactory f2 = new XPathSubsetContentSelectorFactory();
selectorFactories.put(null, f1);
selectorFactories.put("XPathPattern", f1);
selectorFactories.put("XPathSubset", f2);
}
/**
* Creates a new selector object.
* @param content The content element using this selector.
* @param bound The bound element whose children will be selected.
* @param selector The selector string.
*/
public static AbstractContentSelector createSelector
(String selectorLanguage,
ContentManager cm,
XBLOMContentElement content,
Element bound,
String selector) {
ContentSelectorFactory f =
(ContentSelectorFactory) selectorFactories.get(selectorLanguage);
if (f == null) {
throw new RuntimeException
("Invalid XBL content selector language '"
+ selectorLanguage
+ "'");
}
return f.createSelector(cm, content, bound, selector);
}
/**
* An interface for content selector factories.
*/
protected static interface ContentSelectorFactory {
/**
* Creates a new selector object.
*/
AbstractContentSelector createSelector(ContentManager cm,
XBLOMContentElement content,
Element bound,
String selector);
}
/**
* A factory for XPathSubsetContentSelector objects.
*/
protected static class XPathSubsetContentSelectorFactory
implements ContentSelectorFactory {
/**
* Creates a new XPathSubsetContentSelector object.
*/
public AbstractContentSelector createSelector(ContentManager cm,
XBLOMContentElement content,
Element bound,
String selector) {
return new XPathSubsetContentSelector(cm, content, bound, selector);
}
}
/**
* A factory for XPathPatternContentSelector objects.
*/
protected static class XPathPatternContentSelectorFactory
implements ContentSelectorFactory {
/**
* Creates a new XPathPatternContentSelector object.
*/
public AbstractContentSelector createSelector(ContentManager cm,
XBLOMContentElement content,
Element bound,
String selector) {
return new XPathPatternContentSelector(cm, content, bound, selector);
}
}
}