/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
package org.apache.cocoon.woody.transformation;
import java.util.LinkedList;
import org.apache.cocoon.woody.Constants;
import org.apache.cocoon.xml.AbstractXMLPipe;
import org.apache.cocoon.xml.SaxBuffer;
import org.apache.cocoon.xml.XMLConsumer;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.helpers.AttributesImpl;
// TODO: Reduce the Element creation and deletion churn by providing startElement
// and endElement methods which do not create or use Elements on the stack.
/*
* Base class for XMLPipe's. Allows the structure of the source code of
* the XMLPipe to match the structure of the data being transformed.
*
* @author Timothy Larson
* @version $Id: EffectPipe.java,v 1.11 2004/03/09 13:54:12 reinhard Exp $
*/
public class EffectPipe extends AbstractXMLPipe {
protected static final int EVENT_SET_DOCUMENT_LOCATOR = 0;
protected static final int EVENT_START_DOCUMENT = 1;
protected static final int EVENT_END_DOCUMENT = 2;
protected static final int EVENT_START_PREFIX_MAPPING = 3;
protected static final int EVENT_END_PREFIX_MAPPING = 4;
protected static final int EVENT_START_ELEMENT = 5;
protected static final int EVENT_END_ELEMENT = 6;
protected static final int EVENT_ELEMENT = 7;
protected static final int EVENT_CHARACTERS = 8;
protected static final int EVENT_IGNORABLE_WHITESPACE = 9;
protected static final int EVENT_PROCESSING_INSTRUCTION =10;
protected static final int EVENT_SKIPPED_ENTITY =11;
protected static final int EVENT_START_DTD =12;
protected static final int EVENT_END_DTD =13;
protected static final int EVENT_START_ENTITY =14;
protected static final int EVENT_END_ENTITY =15;
protected static final int EVENT_START_CDATA =16;
protected static final int EVENT_END_CDATA =17;
protected static final int EVENT_COMMENT =18;
protected class Element {
public String prefix;
public String uri;
public String loc;
public String raw;
public Attributes attrs;
public boolean mine;
public Element() {
prefix = null; uri = null; loc = null; raw = null; attrs = Constants.EMPTY_ATTRS; mine = true;
}
public Element(String prefix, String uri) {
this.prefix = prefix;
this.uri = uri;
}
public Element(String uri, String loc, String raw, Attributes attrs) {
this.uri = uri;
this.loc = loc;
this.raw = raw;
this.attrs = Constants.EMPTY_ATTRS;
if (attrs == null) {
this.attrs = Constants.EMPTY_ATTRS;
mine = true;
} else {
this.attrs = attrs;
mine = false;
}
}
public void addAttributes(Attributes attrs) {
if (attrs != null) {
if (mine == true) {
if (this.attrs == Constants.EMPTY_ATTRS) {
this.attrs = attrs;
mine = false;
} else {
((AttributesImpl)this.attrs).setAttributes(attrs);
}
} else {
this.attrs = new AttributesImpl(this.attrs);
((AttributesImpl)this.attrs).setAttributes(attrs);
mine = true;
}
}
}
public void addAttribute(String uri, String loc, String raw, String type, String value) {
if (!mine || attrs == Constants.EMPTY_ATTRS) {
attrs = new AttributesImpl(attrs);
mine = true;
}
((AttributesImpl)attrs).addAttribute(uri, loc, raw, type, value);
}
public void addAttribute(String prefix, String uri, String loc, String value) {
if (!mine || attrs == Constants.EMPTY_ATTRS) {
attrs = new AttributesImpl(attrs);
mine = true;
}
((AttributesImpl)attrs).addAttribute(uri, loc, prefix + ":" +loc, "CDATA", value);
}
public void addAttribute(String loc, String value) {
if (!mine || attrs == Constants.EMPTY_ATTRS) {
attrs = new AttributesImpl(attrs);
mine = true;
}
((AttributesImpl)attrs).addAttribute("", loc, loc, "CDATA", value);
}
public void claimAttributes() {
if (!mine) {
attrs = new AttributesImpl(attrs);
mine = true;
}
}
}
protected abstract class Handler {
public abstract Handler process() throws SAXException;
}
protected class NullHandler extends Handler {
public Handler process() throws SAXException {
return this;
}
}
protected class BufferHandler extends Handler {
public Handler process() throws SAXException {
switch (event) {
case EVENT_ELEMENT:
return this;
default:
out.buffer();
return this;
}
}
}
protected class Output extends AbstractXMLPipe {
private LinkedList buffers = null;
private SaxBuffer saxBuffer = null;
private LinkedList elements = null;
protected Element element = null;
public Output() { elements = new LinkedList(); }
public void startPrefixMapping() throws SAXException {
super.startPrefixMapping(input.prefix, input.uri);
}
public void endPrefixMapping() throws SAXException {
super.endPrefixMapping(input.prefix);
}
public void element(String prefix, String uri, String loc, Attributes attrs) throws SAXException {
element = new Element(uri, loc, prefix + ":" + loc, attrs);
}
public void element(String prefix, String uri, String loc) throws SAXException {
element(prefix, uri, loc, null);
}
public void element(String loc, Attributes attrs) throws SAXException {
element = new Element("", loc, loc, attrs);
}
public void element(String loc) throws SAXException {
element(loc, null);
}
public void element() throws SAXException {
element = new Element(input.uri, input.loc, input.raw, input.attrs);
}
public void attribute(String prefix, String uri, String name, String value) throws SAXException {
element.addAttribute(prefix, uri, name, value);
}
public void attribute(String name, String value) throws SAXException {
element.addAttribute(name, value);
}
public void copyAttribute(String prefix, String uri, String name) throws SAXException {
String value = null;
if (input.attrs != null && (value = input.attrs.getValue(uri, name)) != null) {
attribute(prefix, uri, name, value);
} else {
throw new SAXException("Attribute \"" + name + "\" cannot be copied because it does not exist.");
}
}
public void attributes(Attributes attrs) throws SAXException {
element.addAttributes(attrs);
}
public void attributes() throws SAXException {
attributes(input.attrs);
}
public void startElement() throws SAXException {
if (element.attrs == null) {
element.attrs = Constants.EMPTY_ATTRS;
}
super.startElement(element.uri, element.loc, element.raw, element.attrs);
elements.addFirst(element);
element = null;
}
public void endElement() throws SAXException {
element = (Element)elements.removeFirst();
super.endElement(element.uri, element.loc, element.raw);
element = null;
}
public void startElement(String uri, String loc, String raw, Attributes attrs) throws SAXException {
super.startElement(uri, loc, raw, attrs);
}
public void endElement(String uri, String loc, String raw) throws SAXException {
super.endElement(uri, loc, raw);
}
public void copy() throws SAXException {
switch(event) {
case EVENT_SET_DOCUMENT_LOCATOR: this.setDocumentLocator(locator); break;
case EVENT_START_DOCUMENT: this.startDocument(); break;
case EVENT_END_DOCUMENT: this.endDocument(); break;
case EVENT_START_PREFIX_MAPPING: this.startPrefixMapping(); break;
case EVENT_END_PREFIX_MAPPING: this.endPrefixMapping(); break;
case EVENT_START_ELEMENT: this.element(); attributes(); startElement(); break;
case EVENT_END_ELEMENT: this.endElement(); break;
case EVENT_CHARACTERS: this.characters(c, start, len); break;
case EVENT_IGNORABLE_WHITESPACE: this.ignorableWhitespace(c, start, len); break;
case EVENT_PROCESSING_INSTRUCTION: this.processingInstruction(target, data); break;
case EVENT_SKIPPED_ENTITY: this.skippedEntity(name); break;
case EVENT_START_DTD: this.startDTD(name, publicId, systemId); break;
case EVENT_END_DTD: this.endDTD(); break;
case EVENT_START_ENTITY: this.startEntity(name); break;
case EVENT_END_ENTITY: this.endEntity(name); break;
case EVENT_START_CDATA: this.startCDATA(); break;
case EVENT_END_CDATA: this.endCDATA(); break;
case EVENT_COMMENT: this.comment(c, start, len); break;
}
}
protected void bufferInit() {
if (saxBuffer != null) {
if (buffers == null) {
buffers = new LinkedList();
}
buffers.addFirst(saxBuffer);
}
saxBuffer = new SaxBuffer();
}
protected void bufferFini() {
if (buffers != null && buffers.size() > 0) {
saxBuffer = (SaxBuffer)buffers.removeFirst();
} else {
saxBuffer = null;
}
}
protected SaxBuffer getBuffer() {
return saxBuffer;
}
public void buffer() throws SAXException {
switch(event) {
case EVENT_SET_DOCUMENT_LOCATOR: saxBuffer.setDocumentLocator(locator); break;
case EVENT_START_DOCUMENT: saxBuffer.startDocument(); break;
case EVENT_END_DOCUMENT: saxBuffer.endDocument(); break;
case EVENT_START_PREFIX_MAPPING: saxBuffer.startPrefixMapping(prefix, uri); break;
case EVENT_END_PREFIX_MAPPING: saxBuffer.endPrefixMapping(prefix); break;
case EVENT_START_ELEMENT: saxBuffer.startElement(input.uri, input.loc, input.raw, input.attrs); break;
case EVENT_END_ELEMENT: saxBuffer.endElement(input.uri, input.loc, input.raw); break;
case EVENT_CHARACTERS: saxBuffer.characters(c, start, len); break;
case EVENT_IGNORABLE_WHITESPACE: saxBuffer.ignorableWhitespace(c, start, len); break;
case EVENT_PROCESSING_INSTRUCTION: saxBuffer.processingInstruction(target, data); break;
case EVENT_SKIPPED_ENTITY: saxBuffer.skippedEntity(name); break;
case EVENT_START_DTD: saxBuffer.startDTD(name, publicId, systemId); break;
case EVENT_END_DTD: saxBuffer.endDTD(); break;
case EVENT_START_ENTITY: saxBuffer.startEntity(name); break;
case EVENT_END_ENTITY: saxBuffer.endEntity(name); break;
case EVENT_START_CDATA: saxBuffer.startCDATA(); break;
case EVENT_END_CDATA: saxBuffer.endCDATA(); break;
case EVENT_COMMENT: saxBuffer.comment(c, start, len); break;
}
}
}
protected int event = 0;
protected Handler nullHandler = new NullHandler();
protected Handler bufferHandler = new BufferHandler();
protected LinkedList handlers = null;
protected Handler handler = null;
protected LinkedList elements = null;
protected Element input = null;
protected Locator locator = null;
protected String name = null;
protected String publicId = null;
protected String systemId = null;
protected String target = null;
protected String data = null;
protected String prefix = null;
protected String uri = null;
protected char c[] = null;
protected int start = 0;
protected int len = 0;
public Output out = null;
public void init() {
handlers = new LinkedList();
elements = new LinkedList();
out = new Output();
}
//====================================
// Methods overriding AbstractXMLPipe
//====================================
public void setConsumer(XMLConsumer consumer) {
super.setConsumer(consumer);
out.setConsumer(consumer);
}
public void setContentHandler(ContentHandler handler) {
super.setContentHandler(handler);
out.setContentHandler(handler);
}
public void setLexicalHandler(LexicalHandler handler) {
super.setLexicalHandler(handler);
out.setLexicalHandler(handler);
}
public void recycle() {
super.recycle();
handlers = null;
elements = null;
out = null;
}
public void setDocumentLocator(Locator locator) {
this.locator = locator;
try {
event = EVENT_SET_DOCUMENT_LOCATOR; handler = handler.process();
} catch(Exception e) {
throw new RuntimeException(e.getMessage());
}
}
public void startDocument() throws SAXException { event = EVENT_START_DOCUMENT; handler = handler.process(); }
public void endDocument() throws SAXException { event = EVENT_END_DOCUMENT; handler = handler.process(); }
public void startPrefixMapping(String prefix, String uri) throws SAXException {
input = new Element(prefix, uri);
elements.addFirst(input);
//this.prefix = prefix; this.uri = uri;
event = EVENT_START_PREFIX_MAPPING; handler = handler.process();
}
public void endPrefixMapping(String prefix) throws SAXException {
input = (Element)elements.removeFirst();
//this.prefix = prefix;
event = EVENT_END_PREFIX_MAPPING; handler = handler.process();
input = null;
}
public void startElement(String uri, String loc, String raw, Attributes attrs) throws SAXException {
input = new Element(uri, loc, raw, attrs);
elements.addFirst(input);
handlers.addFirst(handler);
event = EVENT_ELEMENT; handler = handler.process();
event = EVENT_START_ELEMENT; handler = handler.process();
}
public void endElement(String uri, String loc, String raw) throws SAXException {
input = (Element)elements.removeFirst();
event = EVENT_END_ELEMENT; handler.process();
handler = (Handler)handlers.removeFirst();
input = null;
}
public void characters(char c[], int start, int len) throws SAXException {
this.c = c; this.start = start; this.len = len;
event = EVENT_CHARACTERS; handler = handler.process();
}
public void ignorableWhitespace(char c[], int start, int len) throws SAXException {
this.c = c; this.start = start; this.len = len;
event = EVENT_IGNORABLE_WHITESPACE; handler = handler.process();
}
public void processingInstruction(String target, String data) throws SAXException {
this.target = target; this.data = data;
event = EVENT_PROCESSING_INSTRUCTION; handler = handler.process();
}
public void skippedEntity(String name) throws SAXException {
this.name = name;
event = EVENT_SKIPPED_ENTITY; handler = handler.process();
}
public void startDTD(String name, String publicId, String systemId) throws SAXException {
this.name = name; this.publicId = publicId; this.systemId = systemId;
event = EVENT_START_DTD; handler = handler.process();
}
public void endDTD() throws SAXException { event = EVENT_END_DTD; handler = handler.process(); }
public void startEntity(String name) throws SAXException {
this.name = name;
event = EVENT_START_ENTITY; handler = handler.process();
}
public void endEntity(String name) throws SAXException {
this.name = name;
event = EVENT_END_ENTITY; handler = handler.process();
}
public void startCDATA() throws SAXException {
event = EVENT_START_CDATA; handler = handler.process();
}
public void endCDATA() throws SAXException {
event = EVENT_END_CDATA; handler = handler.process();
}
public void comment(char c[], int start, int len) throws SAXException {
this.c = c; this.start = start; this.len = len;
event = EVENT_COMMENT; handler = handler.process();
}
}