util.java

httptunnel.jar httptunnel java 源码

	 * Returns full path to the file stored in the demo directory of JRobin
	 * @param filename Partial path to the file stored in the demo directory of JRobin
	 * (just name and extension, without parent directories)
	 * @return Full path to the file
	 */
	public static String getJRobinDemoPath(String filename) {
		String demoDir = getJRobinDemoDirectory();
		if(demoDir != null) {
			return demoDir + filename;
		}
		else {
			return null;
		}
	}

	static boolean sameFilePath(String path1, String path2) throws IOException {
		File file1 = new File(path1);
		File file2 = new File(path2);
		return file1.getCanonicalPath().equals(file2.getCanonicalPath());
	}

	static int getMatchingDatasourceIndex(RrdDb rrd1, int dsIndex, RrdDb rrd2) throws IOException {
		String dsName = rrd1.getDatasource(dsIndex).getDsName();
		try {
			return rrd2.getDsIndex(dsName);
		} catch (RrdException e) {
			return -1;
		}
	}

	static int getMatchingArchiveIndex(RrdDb rrd1, int arcIndex, RrdDb rrd2)
		throws IOException {
		Archive archive = rrd1.getArchive(arcIndex);
		String consolFun = archive.getConsolFun();
		int steps = archive.getSteps();
		try {
			return rrd2.getArcIndex(consolFun, steps);
		} catch (RrdException e) {
			return -1;
		}
	}

	static String getTmpFilename() throws IOException {
		return File.createTempFile("JROBIN_", ".tmp").getCanonicalPath();
	}

	static final String ISO_DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";   // ISO

	/**
	 * Creates GregorianCalendar object from a string. The string should represent
	 * either a long integer (UNIX timestamp in seconds without milliseconds,
	 * like "1002354657") or a human readable date string in the format "yyyy-MM-dd HH:mm:ss"
	 * (like "2004-02-25 12:23:45").
	 * @param timeStr Input string
	 * @return GregorianCalendar object
	 */
	public static GregorianCalendar getGregorianCalendar(String timeStr) {
		// try to parse it as long
		try {
			long timestamp = Long.parseLong(timeStr);
			return Util.getGregorianCalendar(timestamp);
		} catch (NumberFormatException e) { }
		// not a long timestamp, try to parse it as data
		SimpleDateFormat df = new SimpleDateFormat(ISO_DATE_FORMAT);
		df.setLenient(false);
		try {
			Date date = df.parse(timeStr);
            return Util.getGregorianCalendar(date);
		} catch (ParseException e) {
			throw new IllegalArgumentException("Time/date not in " + ISO_DATE_FORMAT +
				" format: " + timeStr);
		}
	}

	/**
	 * Various DOM utility functions
	 */
	public static class Xml {
		public static Node[] getChildNodes(Node parentNode) {
			return getChildNodes(parentNode, null);
		}

		public static Node[] getChildNodes(Node parentNode, String childName) {
			ArrayList nodes = new ArrayList();
			NodeList nodeList = parentNode.getChildNodes();
			for (int i = 0; i < nodeList.getLength(); i++) {
				Node node = nodeList.item(i);
				if (childName == null || node.getNodeName().equals(childName)) {
					nodes.add(node);
				}
			}
			return (Node[]) nodes.toArray(new Node[0]);
		}

		public static Node getFirstChildNode(Node parentNode, String childName) throws RrdException {
			Node[] childs = getChildNodes(parentNode, childName);
			if (childs.length > 0) {
				return childs[0];
			}
			throw new RrdException("XML Error, no such child: " + childName);
		}

		public static boolean hasChildNode(Node parentNode, String childName) {
			Node[] childs = getChildNodes(parentNode, childName);
			return childs.length > 0;
		}

		// -- Wrapper around getChildValue with trim
		public static String getChildValue( Node parentNode, String childName ) throws RrdException {
			return getChildValue( parentNode, childName, true );
		}

		public static String getChildValue( Node parentNode, String childName, boolean trim ) throws RrdException {
			NodeList children = parentNode.getChildNodes();
			for (int i = 0; i < children.getLength(); i++) {
				Node child = children.item(i);
				if (child.getNodeName().equals(childName)) {
					return getValue(child, trim);
				}
			}
			throw new RrdException("XML Error, no such child: " + childName);
		}

		// -- Wrapper around getValue with trim
		public static String getValue(Node node) {
			return getValue( node, true );
		}

		public static String getValue(Node node, boolean trimValue ) {
			String value = null;
			Node child = node.getFirstChild();
			if(child != null) {
				value = child.getNodeValue();
				if( value != null && trimValue ) {
					value = value.trim();
				}
			}
			return value;
		}

		public static int getChildValueAsInt(Node parentNode, String childName) throws RrdException {
			String valueStr = getChildValue(parentNode, childName);
			return Integer.parseInt(valueStr);
		}

		public static int getValueAsInt(Node node) {
			String valueStr = getValue(node);
			return Integer.parseInt(valueStr);
		}

		public static long getChildValueAsLong(Node parentNode, String childName) throws RrdException {
			String valueStr = getChildValue(parentNode, childName);
			return Long.parseLong(valueStr);
		}

		public static long getValueAsLong(Node node) {
			String valueStr = getValue(node);
			return Long.parseLong(valueStr);
		}

		public static double getChildValueAsDouble(Node parentNode, String childName) throws RrdException {
			String valueStr = getChildValue(parentNode, childName);
			return Util.parseDouble(valueStr);
		}

		public static double getValueAsDouble(Node node) {
			String valueStr = getValue(node);
			return Util.parseDouble(valueStr);
		}

		public static boolean getChildValueAsBoolean(Node parentNode, String childName) throws RrdException {
			String valueStr = getChildValue(parentNode, childName);
			return Util.parseBoolean(valueStr);
		}

		public static boolean getValueAsBoolean(Node node) {
			String valueStr = getValue(node);
			return Util.parseBoolean(valueStr);
		}

		public static Element getRootElement(InputSource inputSource) throws RrdException, IOException	{
			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			factory.setValidating(false);
			factory.setNamespaceAware(false);
			try {
				DocumentBuilder builder = factory.newDocumentBuilder();
				Document doc = builder.parse(inputSource);
				return doc.getDocumentElement();
			} catch (ParserConfigurationException e) {
				throw new RrdException(e);
			} catch (SAXException e) {
				throw new RrdException(e);
			}
		}

		public static Element getRootElement(String xmlString)	throws RrdException, IOException {
			return getRootElement(new InputSource(new StringReader(xmlString)));
		}

		public static Element getRootElement(File xmlFile)	throws RrdException, IOException {
			Reader reader = null;
			try {
				reader = new FileReader(xmlFile);
				return getRootElement(new InputSource(reader));
			}
			finally {
				if(reader != null) {
					reader.close();
				}
			}
		}
	}

	private static Date lastLap = new Date();

	/**
	 * Function used for debugging purposes and performance bottlenecks detection.
	 * Probably of no use for end users of JRobin.
	 * @return String representing time in seconds since last
	 * <code>getLapTime()</code> method call.
	 */
	public static String getLapTime() {
		Date newLap = new Date();
		double seconds = (newLap.getTime() - lastLap.getTime()) / 1000.0;
		lastLap = newLap;
		return "[" + seconds + " sec]";
	}

	/**
	 * Returns the root directory of the JRobin distribution. Useful in some demo applications,
	 * probably of no use anywhere else.<p>
	 *
	 * The function assumes that all JRobin .class files are placed under
	 * the &lt;root&gt;/classes subdirectory and that all jars (libraries) are placed in the
	 * &lt;root&gt;/lib subdirectory (the original JRobin directory structure).<p>
	 *
	 * @return absolute path to JRobin's home directory
	 */
	public static String getJRobinHomeDirectory() {
		String className = Util.class.getName().replace('.', '/');
		String uri = Util.class.getResource("/" + className + ".class").toString();
		if(uri.startsWith("file:/")) {
			uri = uri.substring(6);
			File file = new File(uri);
			// let's go 5 steps backwards
			for(int i = 0; i < 5; i++) {
				file = file.getParentFile();
			}
			uri = file.getAbsolutePath();
		}
		else if(uri.startsWith("jar:file:/")) {
			uri = uri.substring(10, uri.lastIndexOf('!'));
			File file = new File(uri);
			// let's go 2 steps backwards
			for(int i = 0; i < 2; i++) {
				file = file.getParentFile();
			}
			uri = file.getAbsolutePath();
		}
		else {
			uri = null;
		}
		return uri;
	}

	/**
	 * Compares two doubles, but returns true if x = y = Double.NaN
	 * @param x First double
	 * @param y Second double
	 * @return true, if doubles are equal, false otherwise.
	 */
	public static boolean equal(double x, double y) {
		if(Double.isNaN(x) && Double.isNaN(y)) {
			return true;
		}
		else {
			return x == y;
		}
	}

}