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/* This file is part of the OWL API.
* The contents of this file are subject to the LGPL License, Version 3.0.
* Copyright 2014, The University of Manchester
*
* This program 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 3 of the License, or (at your option) any later version.
* This program 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 this program. If not, see http://www.gnu.org/licenses/.
*
* Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0 in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
* 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.semanticweb.owlapi.rdf.rdfxml.renderer;
import static org.semanticweb.owlapi.util.OWLAPIPreconditions.checkNotNull;
import static org.semanticweb.owlapi.util.OWLAPIPreconditions.verifyNotNull;
import java.io.IOException;
import java.io.StringReader;
import java.io.Writer;
import java.util.Collections;
import java.util.Deque;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.StringTokenizer;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.xml.parsers.SAXParser;
import org.semanticweb.owlapi.io.XMLUtils;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.parameters.ConfigurationOptions;
import org.semanticweb.owlapi.util.SAXParsers;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* Developed as part of the CO-ODE project http://www.co-ode.org
*
* @author Matthew Horridge, The University Of Manchester, Medical Informatics Group
* @since 2.0.0
*/
public class XMLWriterImpl implements XMLWriter {
@Nonnull
private final Deque elementStack;
@Nonnull
protected final Writer writer;
private String encoding = "";
@Nonnull
private final String xmlBase;
@Nonnull
private final XMLWriterNamespaceManager xmlWriterNamespaceManager;
private Map entities;
private static final int TEXT_CONTENT_WRAP_LIMIT = Integer.MAX_VALUE;
private boolean preambleWritten;
private static final String PERCENT_ENTITY = "%";
protected final XMLWriterPreferences xmlPreferences;
/**
* @param writer writer
* @param xmlWriterNamespaceManager namespace manager
* @param xmlBase XML base
* @param preferences XML writer preferences instance
*/
public XMLWriterImpl(@Nonnull Writer writer,
@Nonnull XMLWriterNamespaceManager xmlWriterNamespaceManager, @Nonnull String xmlBase,
@Nonnull XMLWriterPreferences preferences) {
this.writer = checkNotNull(writer, "writer cannot be null");
this.xmlWriterNamespaceManager =
checkNotNull(xmlWriterNamespaceManager, "xmlWriterNamespaceManager cannot be null");
this.xmlBase = checkNotNull(xmlBase, "xmlBase cannot be null");
xmlPreferences = checkNotNull(preferences, "preferences cannot be null");
elementStack = new LinkedList<>();
setupEntities();
}
private void setupEntities() {
entities = new LinkedHashMap<>();
for (String curNamespace : xmlWriterNamespaceManager.getNamespaces()) {
assert curNamespace != null;
String curPrefix = "";
if (xmlWriterNamespaceManager.getDefaultNamespace().equals(curNamespace)) {
curPrefix = xmlWriterNamespaceManager.getDefaultPrefix();
} else {
curPrefix = xmlWriterNamespaceManager.getPrefixForNamespace(curNamespace);
}
assert curPrefix != null;
if (!curPrefix.isEmpty()) {
entities.put(curNamespace, '&' + curPrefix + ';');
}
}
}
protected String swapForEntity(String value) {
for (String curEntity : entities.keySet()) {
String entityVal = entities.get(curEntity);
if (value.length() > curEntity.length()) {
String repVal = value.replace(curEntity, entityVal);
if (repVal.length() < value.length()) {
return repVal;
}
}
}
return value;
}
/**
* @return default namespace
*/
public String getDefaultNamespace() {
return xmlWriterNamespaceManager.getDefaultNamespace();
}
@Override
public String getXMLBase() {
return xmlBase;
}
@Override
public XMLWriterNamespaceManager getNamespacePrefixes() {
return xmlWriterNamespaceManager;
}
@Override
public void setEncoding(String encoding) {
this.encoding = encoding;
}
@Override
public void setWrapAttributes(boolean b) {
if (!elementStack.isEmpty()) {
XMLElement element = elementStack.peek();
element.setWrapAttributes(b);
}
}
@Override
public void writeStartElement(IRI name) throws IOException {
String qName = xmlWriterNamespaceManager.getQName(name);
if (!XMLUtils.isQName(qName)) {
// Could not generate a valid QName, therefore, we cannot
// write valid XML - just throw an exception!
throw new IllegalElementNameException(name.toString());
}
XMLElement element = new XMLElement(qName, elementStack.size());
if (!elementStack.isEmpty()) {
XMLElement topElement = elementStack.peek();
if (topElement != null) {
topElement.writeElementStart(false);
}
}
elementStack.push(element);
}
@Override
public void writeEndElement() throws IOException {
// Pop the element off the stack and write it out
if (!elementStack.isEmpty()) {
XMLElement element = elementStack.pop();
element.writeElementEnd();
}
}
@Override
public void writeAttribute(String attr, String val) {
XMLElement element = elementStack.peek();
String qName = xmlWriterNamespaceManager.getQName(attr);
if (qName != null) {
element.setAttribute(qName, val);
}
}
@Override
public void writeAttribute(@Nonnull IRI attr, String val) {
XMLElement element = elementStack.peek();
String qName = xmlWriterNamespaceManager.getQName(attr);
if (!qName.isEmpty()) {
element.setAttribute(qName, val);
}
}
@Override
public void writeTextContent(String text) {
XMLElement element = elementStack.peek();
element.setText(text);
}
@Override
public void writeComment(String commentText) throws IOException {
XMLElement element = new XMLElement(null, elementStack.size());
element.setText("");
if (!elementStack.isEmpty()) {
XMLElement topElement = elementStack.peek();
if (topElement != null) {
topElement.writeElementStart(false);
}
}
if (preambleWritten) {
element.writeElementStart(true);
} else {
elementStack.push(element);
}
}
private void writeEntities(@Nonnull IRI rootName) throws IOException {
String qName = xmlWriterNamespaceManager.getQName(rootName);
if (qName.isEmpty()) {
throw new IOException(
"Cannot create valid XML: qname for " + rootName + " is null or empty");
}
writer.write("\n\n\n");
}
writer.write("]>\n\n\n");
}
@Override
public void startDocument(@Nonnull IRI rootElement) throws IOException {
String encodingString = "";
if (!encoding.isEmpty()) {
encodingString = " encoding=\"" + encoding + '"';
}
writer.write("\n");
if (xmlPreferences.isUseNamespaceEntities()) {
writeEntities(rootElement);
}
preambleWritten = true;
while (!elementStack.isEmpty()) {
elementStack.pop().writeElementStart(true);
}
writeStartElement(rootElement);
setWrapAttributes(true);
writeAttribute("xmlns", xmlWriterNamespaceManager.getDefaultNamespace());
if (!xmlBase.isEmpty()) {
writeAttribute("xml:base", xmlBase);
}
for (String curPrefix : xmlWriterNamespaceManager.getPrefixes()) {
if (!curPrefix.isEmpty()) {
writeAttribute("xmlns:" + curPrefix,
verifyNotNull(xmlWriterNamespaceManager.getNamespaceForPrefix(curPrefix)));
}
}
}
@Override
public void endDocument() throws IOException {
// Pop of each element
while (!elementStack.isEmpty()) {
writeEndElement();
}
writer.flush();
}
/** xml element */
public class XMLElement {
private final String name;
private final Map attributes;
@Nullable
String textContent;
private boolean startWritten;
private int indentation;
private boolean wrapAttributes;
/**
* @param name name
* @param indentation indentation
*/
public XMLElement(String name, int indentation) {
this.name = name;
attributes = new LinkedHashMap<>();
this.indentation = indentation;
textContent = null;
startWritten = false;
}
/**
* @param b b
*/
public void setWrapAttributes(boolean b) {
wrapAttributes = b;
}
/**
* @param attribute attribute
* @param value value
*/
public void setAttribute(String attribute, String value) {
attributes.put(attribute, value);
}
/**
* @param content content
*/
public void setText(String content) {
textContent = content;
}
/**
* @param close close
* @throws IOException if there was a problem writing to the output stream
*/
public void writeElementStart(boolean close) throws IOException {
if (!startWritten) {
startWritten = true;
insertIndentation();
if (name != null) {
writer.write('<');
writer.write(name);
writeAttributes();
if (textContent != null) {
boolean wrap = textContent.length() > TEXT_CONTENT_WRAP_LIMIT;
if (wrap) {
writeNewLine();
indentation++;
insertIndentation();
}
writer.write('>');
writeTextContent();
if (wrap) {
indentation--;
}
}
if (close) {
if (textContent != null) {
writeElementEnd();
} else {
writer.write("/>");
writeNewLine();
}
} else {
if (textContent == null) {
writer.write('>');
writeNewLine();
}
}
} else {
// Name is null so by convension this is a comment
if (textContent != null) {
writer.write("\n\n\n");
StringTokenizer tokenizer = new StringTokenizer(textContent, "\n", true);
while (tokenizer.hasMoreTokens()) {
String token = tokenizer.nextToken();
if (!token.equals("\n")) {
insertIndentation();
}
writer.write(token);
}
writer.write("\n\n");
}
}
}
}
/**
* write end element
*
* @throws IOException if there was a problem writing to the output stream
*/
public void writeElementEnd() throws IOException {
if (name != null) {
if (!startWritten) {
writeElementStart(true);
} else {
if (textContent == null) {
insertIndentation();
}
writer.write("");
writeNewLine();
}
}
}
private void writeAttribute(String attr, String val) throws IOException {
writer.write(attr);
writer.write('=');
writer.write('"');
if (xmlPreferences.isUseNamespaceEntities()) {
writer.write(swapForEntity(XMLUtils.escapeXML(val)));
} else {
writer.write(XMLUtils.escapeXML(val));
}
writer.write('"');
}
private void writeAttributes() throws IOException {
for (Iterator it = attributes.keySet().iterator(); it.hasNext();) {
String attr = it.next();
String val = attributes.get(attr);
writer.write(' ');
writeAttribute(attr, val);
if (it.hasNext() && wrapAttributes) {
writer.write("\n");
indentation++;
insertIndentation();
indentation--;
}
}
}
private void writeTextContent() throws IOException {
if (textContent != null) {
// only escape the data if this is not an XML literal
if (isRDFXMLLiteral()) {
checkProperXMLLiteral(textContent);
writer.write(textContent);
} else {
writer.write(XMLUtils.escapeXML(textContent));
}
}
}
private boolean isRDFXMLLiteral() {
return "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral"
.equals(attributes.get("rdf:datatype"))
|| "Literal".equals(attributes.get("rdf:parseType"));
}
private void checkProperXMLLiteral(String text) throws IOException {
try {
String expansions = ConfigurationOptions.ENTITY_EXPANSION_LIMIT
.getValue(String.class, Collections.emptyMap());
SAXParser parser = SAXParsers.initParserWithOWLAPIStandards(null, expansions);
parser.parse(new InputSource(new StringReader(text)), new DefaultHandler());
} catch (SAXException e) {
throw new IOException("XML literal is not self contained: \"" + text + "\"", e);
}
}
private void insertIndentation() throws IOException {
if (xmlPreferences.isIndenting()) {
for (int i = 0; i < indentation * xmlPreferences.getIndentSize(); i++) {
writer.write(' ');
}
}
}
private void writeNewLine() throws IOException {
writer.write('\n');
}
}
}
