/**
 * Copyright 2010 JBoss Inc
 *
 * 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.eclipse.webdav.dom;

import org.eclipse.webdav.Policy;
import org.eclipse.webdav.http.client.Response;

/**
 * A <code>Status</code> parses an http status string.
 * <p>
 * <b>Note:</b> This class/interface is part of an interim API that is still under 
 * development and expected to change significantly before reaching stability. 
 * It is being made available at this early stage to solicit feedback from pioneering 
 * adopters on the understanding that any code that uses this API will almost 
 * certainly be broken (repeatedly) as the API evolves.
 * </p>
 */
public class Status {

	private int fStatusCode;
	private String fStatusMessage;

	/**
	 * Creates a new status from the given http status string.
	 *
	 * @param  status the http status string; for example, "HTTP/1.1 200 OK"
	 * @throws MalformedElementException if the given status is malformed
	 */
	public Status(String status) throws MalformedElementException {
		status = status.trim();
		int len = status.length();

		int end;
		int start = 0;

		while (start < len && !Character.isWhitespace(status.charAt(start))) {
			++start;
		}
		while (start < len && Character.isWhitespace(status.charAt(start))) {
			++start;
		}

		if (start >= len) {
			throw new MalformedElementException(Policy.bind("exception.malformedStatus", status)); //$NON-NLS-1$
		}

		end = start;
		while (end < len && Character.isDigit(status.charAt(end))) {
			++end;
		}

		if (end == start || end >= len) {
			throw new MalformedElementException(Policy.bind("exception.malformedStatus", status)); //$NON-NLS-1$
		}

		fStatusCode = Integer.parseInt(status.substring(start, end));

		start = end;
		while (start < len && Character.isWhitespace(status.charAt(start))) {
			++start;
		}

		if (start >= len) {
			throw new MalformedElementException(Policy.bind("exception.malformedStatus", status)); //$NON-NLS-1$
		}

		fStatusMessage = status.substring(start, len);
	}

	/**
	 * Returns this status' status code. For example, if the http status
	 * string was "HTTP/1.1 200 OK", the status code would be 200.
	 *
	 * @return this status' status code
	 * @see    Response
	 */
	public int getStatusCode() {
		return fStatusCode;
	}

	/**
	 * Returns this status' status message; for example, if the http status
	 * string was "HTTP/1.1 200 OK", the status message would be "OK".
	 *
	 * @return this status' status message
	 */
	public String getStatusMessage() {
		return fStatusMessage;
	}
}