* @author John Jenkins
 */
public class Observer {
<<<<<<< HEAD
	/**
	 * This is the contents of the JavaSciprt file that evaluates schemas and
	 * data against those schemas. This should be used in conjunction with
	 * something like Rhino, in order to create a JavaScript interpreter to
	 * evaluate the JavaScript.
	 */
	private static final String JSON_SCHEMA_JS;
	static {
		FileReader reader;
		try {
			reader =
				new FileReader(
					System.getProperty("webapp.root") + "JsonSchema.js");
		}
		catch(FileNotFoundException e) {
			throw new IllegalStateException(
				"The JSON Schema could not be found.",
				e);
		}
		
		try {
			int amountRead;
			char[] buffer = new char[4096];
			StringBuilder builder = new StringBuilder();
			while((amountRead = reader.read(buffer)) != -1) {
				builder.append(buffer, 0, amountRead);
			}
		
			JSON_SCHEMA_JS = builder.toString();
		}
		catch(IOException e) {
			throw new IllegalStateException(
				"There was a problem reading the JSON Schema's JavaScript file.",
				e);
		}
		finally {
			try {
				reader.close();
			}
			catch(IOException e) {
				throw new IllegalStateException(
	public static final String ID_PATTERN = 
					"Could not close the file reader.",
					e);
			}
		}
	}
	
	/**
	 * The pattern for allowed observer IDs.
	 */
		"([a-zA-Z0-9]+(\\.[a-zA-Z0-9]+)+){3,255}";
	/**
	 * The compiled pattern for allowed observer IDs.
	 */
	private static final Pattern PATTERN_OBSERVER_ID = 
		Pattern.compile(ID_PATTERN);
	
	/**
	 * The JSON factory for creating parsers and generators.
	 */
	private static final JsonFactory JSON_FACTORY = new MappingJsonFactory();
	
	private static final String KEY_JSON_ID = "id";
	private static final String KEY_JSON_VERSION = "version";
	private static final String KEY_JSON_NAME = "name";
	private static final String KEY_JSON_DESCRIPTION = "description";
	private static final String KEY_JSON_VERSION_STRING = "versionString";
	private static final String KEY_JSON_STREAMS = "streams";
=======
	private static final Pattern PATTERN_ID_VALIDATOR = 
		Pattern.compile("([a-zA-Z]{1}[\\w]*(\\.[a-zA-Z]{1}[\\w]*)+)?");
	private static final long MAX_OBSERVER_ID_LENGTH = 255;
>>>>>>> 5deda018dcaf5c03374c566f3550ba5f49eeb9a7

	private final String id;
	private final long version;

 * @author John Jenkins
 */
public class Observer {
	/**
	 * This is the contents of the JavaSciprt file that evaluates schemas and
	 * data against those schemas. This should be used in conjunction with
	 * something like Rhino, in order to create a JavaScript interpreter to
	 * evaluate the JavaScript.
	 */
	private static final String JSON_SCHEMA_JS;
	static {
		FileReader reader;
		try {
			reader =
				new FileReader(
					System.getProperty("webapp.root") + "JsonSchema.js");
		}
		catch(FileNotFoundException e) {
			throw new IllegalStateException(
				"The JSON Schema could not be found.",
				e);
		}
		
		try {
			int amountRead;
			char[] buffer = new char[4096];
			StringBuilder builder = new StringBuilder();
			while((amountRead = reader.read(buffer)) != -1) {
				builder.append(buffer, 0, amountRead);
			}
		
			JSON_SCHEMA_JS = builder.toString();
		}
		catch(IOException e) {
			throw new IllegalStateException(
				"There was a problem reading the JSON Schema's JavaScript file.",
				e);
		}
		finally {
			try {
				reader.close();
			}
			catch(IOException e) {
				throw new IllegalStateException(
					"Could not close the file reader.",
					e);
			}
		}
	}
	
	/**
	 * The JSON factory for creating parsers and generators.
	 */
	private static final JsonFactory JSON_FACTORY = new MappingJsonFactory();
	
	private static final String KEY_JSON_ID = "id";
	private static final String KEY_JSON_VERSION = "version";
	private static final String KEY_JSON_NAME = "name";
	private static final String KEY_JSON_DESCRIPTION = "description";
	private static final String KEY_JSON_VERSION_STRING = "versionString";
	private static final String KEY_JSON_STREAMS = "streams";
	
	private static final Pattern PATTERN_ID_VALIDATOR = 
		Pattern.compile("([a-zA-Z]{1}[\\w]*(\\.[a-zA-Z]{1}[\\w]*)+)?");
	private static final long MAX_OBSERVER_ID_LENGTH = 255;

	private final String id;
	private final long version;