/*

 * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package build.tools.logutil;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.InputStreamReader;

import java.io.IOException;

import java.util.LinkedList;

import java.util.Queue;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Input {

  /**

   * The name of the package this class will inhabit.

   */

  private String packageName;

  /**

   * The name of the generated class.

   */

  private String className;

  /**

   * The name of the group of exceptions handled by the class.

   */

  private String groupName;

  /**

   * The group of exceptions.

   */

  private Queue<InputException> exceptions;

  /**

   * Represents the current state of parsing the input.

   */

  private enum State

  {

    OUTER,

    IN_CLASS,

    IN_EXCEPTION_LIST

  };

  /**

   * Regular expression to match each code line.

   */

  private static final Pattern EXCEPTION_INFO_REGEX =

    Pattern.compile("(\\w+)\\s*(\\d+)\\s*(\\w+)");

  /**

   * Parses the specified file to create a new {@link Input}

   * object.

   *

   * @param filename the file to parse.

   * @throws FileNotFoundException if the file can't be found.

   * @throws IOException if an I/O error occurs.

   */

  public Input(final String filename)

  throws FileNotFoundException, IOException {

    BufferedReader r =

      new BufferedReader(new InputStreamReader(new FileInputStream(filename)));

    State state = State.OUTER;

    InputException current = null;

    exceptions = new LinkedList<InputException>();

    String line;

    while ((line = r.readLine()) != null) {

      // Skip ; comments

      if (line.startsWith(";"))

        continue;

      int index = line.indexOf("(");

      if (index == -1)

        continue;

      switch (state) {

      case OUTER:

        state = State.IN_CLASS;

        String[] classInfo = line.substring(index).split(" ");

        packageName = classInfo[0].substring(2, classInfo[0].length() - 1);

        className = classInfo[1].substring(1, classInfo[1].length() - 1);

        groupName = classInfo[2];

        break;

      case IN_CLASS:

        state = State.IN_EXCEPTION_LIST;

        break;

      case IN_EXCEPTION_LIST:

        boolean inQuote = false;

        boolean inCode = false;

        boolean end = false;

        int start = index + 1;

        Queue<String> lines = new LinkedList<String>();

        for (int a = start; a < line.length(); ++a) {

          if (line.charAt(a) == '(' && !inCode && !inQuote) {

            if (current == null)

              current =

                new InputException(line.substring(start, a).trim());

            start = a + 1;

            inCode = true;

          }

          if (line.charAt(a) == '"')

            inQuote = !inQuote;

          if (line.charAt(a) == ')' && !inQuote) {

            if (inCode) {

              lines.offer(line.substring(start, a));

              inCode = false;

            } else

              end = true;

          }

          if (!end && a == line.length() - 1)

            line += r.readLine();

        }

        for (String l : lines) {

          int stringStart = l.indexOf("\"") + 1;

          int stringEnd = l.indexOf("\"", stringStart);

          Matcher matcher = EXCEPTION_INFO_REGEX.matcher(l.substring(0, stringStart));

          if (matcher.find())

            current.add(new InputCode(matcher.group(1),

                                      Integer.parseInt(matcher.group(2)),

                                      matcher.group(3),

                                      l.substring(stringStart, stringEnd)));

        }

        exceptions.offer(current);

        current = null;

        break;

      }

    }

  }

  /**

   * Returns the name of this group of exceptions.

   *

   * @return the name of this group of exceptions.

   */

  public String getGroupName()

  {

    return groupName;

  }

  /**

   * Returns the name of the package this class will go in.

   *

   * @return the name of the package.

   */

  public String getPackageName()

  {

    return packageName;

  }

  /**

   * Returns the name of the generated class.

   *

   * @return the name of the class.

   */

  public String getClassName()

  {

    return className;

  }

  /**

   * Returns the exceptions contained in this class.

   *

   * @return the exceptions.

   */

  public Queue<InputException> getExceptions() {

    return exceptions;

  }

  /**

   * Returns a textual representation of this input.

   *

   * @return a textual representation.

   */

  public String toString() {

    return getClass().getName() +

      "[packageName=" + packageName +

      ",className=" + className +

      ",groupName=" + groupName +

      ",exceptions=" + exceptions +

      "]";

  }

}