| /* FilteredSAXEventSink.java -- |
| Copyright (C) 1999,2000,2001 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.xml.dom.ls; |
| |
| import java.util.LinkedList; |
| import org.w3c.dom.Attr; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.Text; |
| import org.w3c.dom.ls.LSParserFilter; |
| import org.w3c.dom.traversal.NodeFilter; |
| import org.xml.sax.Attributes; |
| import org.xml.sax.SAXException; |
| |
| /** |
| * A SAX event sink that calls out to a parser filter in order to decide |
| * whether to insert nodes into the tree. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| class FilteredSAXEventSink |
| extends SAXEventSink |
| { |
| |
| final LSParserFilter filter; |
| final int whatToShow; |
| |
| /** |
| * Stack of elements to insert. |
| */ |
| LinkedList nodes; |
| |
| /** |
| * Corresponding stack of filter decisions about the nodes. |
| */ |
| LinkedList decisions; |
| |
| /** |
| * True when rejecting child nodes. |
| */ |
| boolean rejecting; |
| |
| FilteredSAXEventSink(LSParserFilter filter) |
| { |
| this.filter = filter; |
| whatToShow = filter.getWhatToShow(); |
| } |
| |
| public void startDocument() |
| throws SAXException |
| { |
| if (interrupted) |
| { |
| return; |
| } |
| nodes = new LinkedList(); |
| decisions = new LinkedList(); |
| |
| super.startDocument(); |
| } |
| |
| public void endDocument() |
| throws SAXException |
| { |
| if (interrupted) |
| { |
| return; |
| } |
| super.endDocument(); |
| |
| switch (getDecision(ctx, false)) |
| { |
| case LSParserFilter.FILTER_REJECT: |
| ctx = null; |
| doc = null; |
| break; |
| } |
| |
| nodes = null; |
| decisions = null; |
| } |
| |
| public void startElement(String uri, String localName, String qName, |
| Attributes atts) |
| throws SAXException |
| { |
| if (rejecting || interrupted) |
| { |
| return; |
| } |
| Element element = createElement(uri, localName, qName, atts); |
| ctx = element; |
| |
| short decision = getDecision(element, true); |
| nodes.addLast(element); |
| decisions.addLast(new Short(decision)); |
| |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_REJECT: |
| rejecting = true; |
| break; |
| case LSParserFilter.FILTER_INTERRUPT: |
| interrupted = true; |
| break; |
| } |
| } |
| |
| protected Attr createAttr(Attributes atts, int index) |
| { |
| Attr attr = super.createAttr(atts, index); |
| short decision = getDecision(attr, false); |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_REJECT: |
| return null; |
| case LSParserFilter.FILTER_INTERRUPT: |
| interrupted = true; |
| return null; |
| } |
| return attr; |
| } |
| |
| public void endElement(String uri, String localName, String qName) |
| throws SAXException |
| { |
| if (rejecting || interrupted) |
| { |
| return; |
| } |
| super.endElement(uri, localName, qName); |
| |
| Element element = (Element) nodes.removeLast(); |
| Node parent = nodes.isEmpty() ? doc : (Node) nodes.getLast(); |
| ctx = parent; |
| short decision = ((Short) decisions.removeLast()).shortValue(); |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_SKIP: |
| // Add all children of element to parent |
| for (Node child = element.getFirstChild(); child != null; |
| child = child.getNextSibling()) |
| { |
| parent.insertBefore(child, element); |
| } |
| return; |
| case LSParserFilter.FILTER_REJECT: |
| rejecting = false; |
| break; |
| } |
| decision = getDecision(element, false); |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_ACCEPT: |
| parent.appendChild(element); |
| break; |
| case LSParserFilter.FILTER_INTERRUPT: |
| interrupted = true; |
| break; |
| } |
| } |
| |
| public void characters(char[] c, int off, int len) |
| throws SAXException |
| { |
| if (rejecting || interrupted) |
| { |
| return; |
| } |
| Text text = createText(c, off, len); |
| short decision = getDecision(text, false); |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_ACCEPT: |
| ctx.appendChild(text); |
| break; |
| case LSParserFilter.FILTER_INTERRUPT: |
| interrupted = true; |
| break; |
| } |
| } |
| |
| public void processingInstruction(String target, String data) |
| throws SAXException |
| { |
| if (rejecting || interrupted || inDTD) |
| { |
| return; |
| } |
| Node pi = createProcessingInstruction(target, data); |
| short decision = getDecision(pi, false); |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_ACCEPT: |
| ctx.appendChild(pi); |
| break; |
| case LSParserFilter.FILTER_INTERRUPT: |
| interrupted = true; |
| break; |
| } |
| } |
| |
| public void startDTD(String name, String publicId, String systemId) |
| throws SAXException |
| { |
| if (interrupted) |
| { |
| return; |
| } |
| Node doctype = createDocumentType(name, publicId, systemId); |
| ctx = doctype; |
| inDTD = true; |
| nodes.addLast(doctype); |
| decisions.addLast(new Short(LSParserFilter.FILTER_ACCEPT)); |
| } |
| |
| public void endDTD() |
| throws SAXException |
| { |
| if (interrupted) |
| { |
| return; |
| } |
| Node doctype = (Node) nodes.removeLast(); |
| decisions.removeLast(); |
| inDTD = false; |
| ctx = doc; |
| short decision = getDecision(doctype, false); |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_ACCEPT: |
| ctx.appendChild(doctype); |
| break; |
| case LSParserFilter.FILTER_INTERRUPT: |
| interrupted = true; |
| break; |
| } |
| } |
| |
| public void comment(char[] c, int off, int len) |
| throws SAXException |
| { |
| if (rejecting || interrupted || inDTD) |
| { |
| return; |
| } |
| Node comment = createComment(c, off, len); |
| short decision = getDecision(comment, false); |
| switch (decision) |
| { |
| case LSParserFilter.FILTER_ACCEPT: |
| ctx.appendChild(comment); |
| break; |
| case LSParserFilter.FILTER_INTERRUPT: |
| interrupted = true; |
| break; |
| } |
| } |
| |
| // TODO declarations |
| |
| short getDecision(Node node, boolean start) |
| { |
| boolean show = (whatToShow == NodeFilter.SHOW_ALL); |
| if (!show) |
| { |
| switch (node.getNodeType()) |
| { |
| case Node.ATTRIBUTE_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_ATTRIBUTE) != 0); |
| break; |
| case Node.TEXT_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_TEXT) != 0); |
| break; |
| case Node.CDATA_SECTION_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_CDATA_SECTION) != 0); |
| break; |
| case Node.ELEMENT_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_ELEMENT) != 0); |
| break; |
| case Node.COMMENT_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_COMMENT) != 0); |
| break; |
| case Node.DOCUMENT_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_DOCUMENT) != 0); |
| break; |
| case Node.PROCESSING_INSTRUCTION_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_PROCESSING_INSTRUCTION) != 0); |
| break; |
| case Node.DOCUMENT_FRAGMENT_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_DOCUMENT_FRAGMENT) != 0); |
| break; |
| case Node.DOCUMENT_TYPE_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_DOCUMENT_TYPE) != 0); |
| break; |
| case Node.ENTITY_REFERENCE_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_ENTITY_REFERENCE) != 0); |
| break; |
| case Node.ENTITY_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_ENTITY) != 0); |
| break; |
| case Node.NOTATION_NODE: |
| show = ((whatToShow & NodeFilter.SHOW_NOTATION) != 0); |
| break; |
| } |
| } |
| if (!show) |
| { |
| return LSParserFilter.FILTER_ACCEPT; |
| } |
| if (start) |
| { |
| return filter.startElement((Element) node); |
| } |
| return filter.acceptNode(node); |
| } |
| |
| } |
| |
