r7322 - dumbhippo/trunk/server/src/com/dumbhippo

[commits mugshot org]

Author: walters
Date: 2008-02-20 10:24:18 -0600 (Wed, 20 Feb 2008)
New Revision: 7322

Added:
   dumbhippo/trunk/server/src/com/dumbhippo/XmlUtils.java
Log:
The sane way to parse XML.


Added: dumbhippo/trunk/server/src/com/dumbhippo/XmlUtils.java
===================================================================
--- dumbhippo/trunk/server/src/com/dumbhippo/XmlUtils.java	2008-02-19 21:47:09 UTC (rev 7321)
+++ dumbhippo/trunk/server/src/com/dumbhippo/XmlUtils.java	2008-02-20 16:24:18 UTC (rev 7322)
@@ -0,0 +1,85 @@
+package com.dumbhippo;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.io.StringReader;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import javax.xml.namespace.NamespaceContext;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathFactory;
+
+import org.w3c.dom.Document;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+/* The sane way to parse XML. */
+public class XmlUtils {
+	public static class XmlParseData {
+		public XmlParseData(Document doc, XPath xpath) {
+			this.doc = doc;
+			this.xpath = xpath;
+		}
+		public Document doc;
+		public XPath xpath;
+	}
+	public static XmlParseData parseXml(InputSource source, final Map<String,String> namespaces) throws SAXException, IOException {
+		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+		factory.setNamespaceAware(true);
+		Document doc;		
+		try {
+			doc = factory.newDocumentBuilder().parse(source);
+		} catch (ParserConfigurationException e) {
+			throw new RuntimeException(e);
+		}
+		XPath xpath = XPathFactory.newInstance().newXPath();
+		NamespaceContext nshandler = new javax.xml.namespace.NamespaceContext() {
+			public String getNamespaceURI(String prefix) {
+				return namespaces == null ? null : namespaces.get(prefix);
+			}
+			public Iterator<?> getPrefixes(String val) { return null; }
+			public String getPrefix(String uri) { return null; }
+		};
+		xpath.setNamespaceContext(nshandler);
+		return new XmlParseData(doc, xpath);
+	}
+	
+	private static Map<String,String> stringsToMap(String[] array) {
+		if (array.length % 2 != 0)
+			throw new IllegalArgumentException("Invalid mapping arrray literal; must have an even number of items");
+		Map<String,String> map = new HashMap<String, String>();
+		for (int i = 0; i < array.length; i+=2) {
+			map.put(array[i], array[i]+1);
+		}
+		return map;
+	}
+	
+	public static XmlParseData parseXml(InputStream stream, Map<String,String> namespaces) throws SAXException, IOException {
+		return parseXml(new InputSource(stream), namespaces);
+	}
+	
+	public static XmlParseData parseXml(Reader stream, Map<String,String> namespaces) throws SAXException, IOException {
+		return parseXml(new InputSource(stream), namespaces);
+	}
+	
+	public static XmlParseData parseXml(InputStream stream, String[] namespaces) throws SAXException, IOException {
+		return parseXml(new InputSource(stream), stringsToMap(namespaces));
+	}
+	
+	public static XmlParseData parseXml(Reader stream, String[] namespaces) throws SAXException, IOException {
+		return parseXml(new InputSource(stream), stringsToMap(namespaces));
+	}	
+	
+	public static XmlParseData parseXml(InputStream stream) throws SAXException, IOException {
+		return parseXml(new InputSource(stream), null);
+	}
+	
+	public static XmlParseData parseXml(Reader stream) throws SAXException, IOException {
+		return parseXml(new InputSource(stream), null);
+	}
+}