/*
* plist - An open source library to parse and generate property lists
* Copyright (C) 2014 Daniel Dreibrodt
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.dd.plist;
import org.w3c.dom.*;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.List;
/**
* Parses XML property lists.
*
* @author Daniel Dreibrodt
*/
public class XMLPropertyListParser {
/**
* Instantiation is prohibited by outside classes.
*/
protected XMLPropertyListParser() {
/** empty **/
}
private static DocumentBuilderFactory docBuilderFactory = null;
/**
* Initialize the document builder factory so that it can be reused and does not need to
* be reinitialized for each parse action.
*/
private static synchronized void initDocBuilderFactory() {
docBuilderFactory = DocumentBuilderFactory.newInstance();
docBuilderFactory.setIgnoringComments(true);
docBuilderFactory.setCoalescing(true);
}
/**
* Gets a DocumentBuilder to parse a XML property list.
* As DocumentBuilders are not thread-safe a new DocBuilder is generated for each request.
*
* @return A new DocBuilder that can parse property lists w/o an internet connection.
* @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
* could not be created. This should not occur.
*/
private static synchronized DocumentBuilder getDocBuilder() throws ParserConfigurationException {
if (docBuilderFactory == null)
initDocBuilderFactory();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
docBuilder.setEntityResolver(new EntityResolver() {
public InputSource resolveEntity(String publicId, String systemId) {
if ("-//Apple Computer//DTD PLIST 1.0//EN".equals(publicId) || // older publicId
"-//Apple//DTD PLIST 1.0//EN".equals(publicId)) { // newer publicId
// return a dummy, zero length DTD so we don't have to fetch
// it from the network.
return new InputSource(new ByteArrayInputStream(new byte[0]));
}
return null;
}
});
return docBuilder;
}
/**
* Parses a XML property list file.
*
* @param f The XML property list file.
* @return The root object of the property list. This is usually a NSDictionary but can also be a NSArray.
* @see javax.xml.parsers.DocumentBuilder#parse(java.io.File)
* @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
* could not be created. This should not occur.
* @throws java.io.IOException If any IO error occurs while reading the file.
* @throws org.xml.sax.SAXException If any parse error occurs.
* @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
* @throws java.text.ParseException If a date string could not be parsed.
*/
public static NSObject parse(File f) throws ParserConfigurationException, IOException, SAXException, PropertyListFormatException, ParseException {
DocumentBuilder docBuilder = getDocBuilder();
Document doc = docBuilder.parse(f);
return parse(doc);
}
/**
* Parses a XML property list from a byte array.
*
* @param bytes The byte array containing the property list's data.
* @return The root object of the property list. This is usually a NSDictionary but can also be a NSArray.
* @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
* could not be created. This should not occur.
* @throws java.io.IOException If any IO error occurs while reading the file.
* @throws org.xml.sax.SAXException If any parse error occurs.
* @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
* @throws java.text.ParseException If a date string could not be parsed.
*/
public static NSObject parse(final byte[] bytes) throws ParserConfigurationException, ParseException, SAXException, PropertyListFormatException, IOException {
ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
return parse(bis);
}
/**
* Parses a XML property list from an input stream.
*
* @param is The input stream pointing to the property list's data.
* @return The root object of the property list. This is usually a NSDictionary but can also be a NSArray.
* @see javax.xml.parsers.DocumentBuilder#parse(java.io.InputStream)
* @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
* could not be created. This should not occur.
* @throws java.io.IOException If any IO error occurs while reading the file.
* @throws org.xml.sax.SAXException If any parse error occurs.
* @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
* @throws java.text.ParseException If a date string could not be parsed.
*/
public static NSObject parse(InputStream is) throws ParserConfigurationException, IOException, SAXException, PropertyListFormatException, ParseException {
DocumentBuilder docBuilder = getDocBuilder();
Document doc = docBuilder.parse(is);
return parse(doc);
}
/**
* Parses a property list from an XML document.
*
* @param doc The XML document.
* @return The root NSObject of the property list contained in the XML document.
* @throws java.io.IOException If any IO error occurs while reading the file.
* @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
* @throws java.text.ParseException If a date string could not be parsed.
*/
public static NSObject parse(Document doc) throws PropertyListFormatException, IOException, ParseException {
DocumentType docType = doc.getDoctype();
if (docType == null) {
if (!doc.getDocumentElement().getNodeName().equals("plist")) {
throw new UnsupportedOperationException("The given XML document is not a property list.");
}
} else if (!docType.getName().equals("plist")) {
throw new UnsupportedOperationException("The given XML document is not a property list.");
}
Node rootNode;
if (doc.getDocumentElement().getNodeName().equals("plist")) {
//Root element wrapped in plist tag
List<Node> rootNodes = filterElementNodes(doc.getDocumentElement().getChildNodes());
if (rootNodes.isEmpty()) {
throw new PropertyListFormatException("The given XML property list has no root element!");
} else if (rootNodes.size() == 1) {
rootNode = rootNodes.get(0);
} else {
throw new PropertyListFormatException("The given XML property list has more than one root element!");
}
} else {
//Root NSObject not wrapped in plist-tag
rootNode = doc.getDocumentElement();
}
return parseObject(rootNode);
}
/**
* Parses a node in the XML structure and returns the corresponding NSObject
*
* @param n The XML node.
* @return The corresponding NSObject.
* @throws java.io.IOException If any IO error occurs while parsing a Base64 encoded NSData object.
* @throws java.text.ParseException If a date string could not be parsed.
*/
private static NSObject parseObject(Node n) throws ParseException, IOException {
String type = n.getNodeName();
if (type.equals("dict")) {
NSDictionary dict = new NSDictionary();
List<Node> children = filterElementNodes(n.getChildNodes());
for (int i = 0; i < children.size(); i += 2) {
Node key = children.get(i);
Node val = children.get(i + 1);
String keyString = getNodeTextContents(key);
dict.put(keyString, parseObject(val));
}
return dict;
} else if (type.equals("array")) {
List<Node> children = filterElementNodes(n.getChildNodes());
NSArray array = new NSArray(children.size());
for (int i = 0; i < children.size(); i++) {
array.setValue(i, parseObject(children.get(i)));
}
return array;
} else if (type.equals("true")) {
return new NSNumber(true);
} else if (type.equals("false")) {
return new NSNumber(false);
} else if (type.equals("integer")) {
return new NSNumber(getNodeTextContents(n));
} else if (type.equals("real")) {
return new NSNumber(getNodeTextContents(n));
} else if (type.equals("string")) {
return new NSString(getNodeTextContents(n));
} else if (type.equals("data")) {
return new NSData(getNodeTextContents(n));
} else if (type.equals("date")) {
return new NSDate(getNodeTextContents(n));
}
return null;
}
/**
* Returns all element nodes that are contained in a list of nodes.
*
* @param list The list of nodes to search.
* @return The sub-list containing only nodes representing actual elements.
*/
private static List<Node> filterElementNodes(NodeList list) {
List<Node> result = new ArrayList<Node>(list.getLength());
for (int i = 0; i < list.getLength(); i++) {
if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
result.add(list.item(i));
}
}
return result;
}
/**
* Returns a node's text content.
* This method will return the text value represented by the node's direct children.
* If the given node is a TEXT or CDATA node, then its value is returned.
*
* @param n The node.
* @return The node's text content.
*/
private static String getNodeTextContents(Node n) {
if (n.getNodeType() == Node.TEXT_NODE || n.getNodeType() == Node.CDATA_SECTION_NODE) {
Text txtNode = (Text) n;
String content = txtNode.getWholeText(); //This concatenates any adjacent text/cdata/entity nodes
if (content == null)
return "";
else
return content;
} else {
if (n.hasChildNodes()) {
NodeList children = n.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
//Skip any non-text nodes, like comments or entities
Node child = children.item(i);
if (child.getNodeType() == Node.TEXT_NODE || child.getNodeType() == Node.CDATA_SECTION_NODE) {
Text txtNode = (Text) child;
String content = txtNode.getWholeText(); //This concatenates any adjacent text/cdata/entity nodes
if (content == null)
return "";
else
return content;
}
}
return "";
} else {
return "";
}
}
}
}