/**
 * Redistribution and use of this software and associated documentation ("Software"), with or
 * without modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright statements and notices. Redistributions
 * must also contain a copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The name "Exolab" must not be used to endorse or promote products derived from this Software
 * without prior written permission of Intalio, Inc. For written permission, please contact
 * info@exolab.org.
 *
 * 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
 * their names without prior written permission of Intalio, Inc. Exolab is a registered trademark of
 * Intalio, Inc.
 *
 * 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTALIO, INC. OR ITS
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
 */
package org.exolab.javasource;

/**
 * A class that represents a Java comment.
 *
 * @author <a href="mailto:keith AT kvisco DOT com">Keith Visco</a>
 * @version $Revision$ $Date: 2005-02-26 17:30:28 -0700 (Sat, 26 Feb 2005) $
 */
public final class JComment {
  // --------------------------------------------------------------------------

  /**
   * The auto style, allows this JComment to automatically choose a style for this comment.
   */
  public static final short AUTO_STYLE = 0;

  /** The block comment style. \/* *\/ */
  public static final short BLOCK_STYLE = 1;

  /** The line comment style. \/\/ */
  public static final short LINE_STYLE = 2;

  /** The header style, similiar to block, but with an '*' at the start of each line. */
  public static final short HEADER_STYLE = 3;

  /** Similiar to HEADER_STYLE. But starts with: \/** */
  public static final short JAVADOC_STYLE = 4;

  private static final String START_BLOCK = "/*";
  private static final String END_BLOCK = " */";

  private static final String START_JAVADOC = "/**";
  private static final String END_JAVADOC = " */";

  private static final String ASTERIX_PREFIX = " * ";
  private static final String LINE_COMMENT_PREFIX = "// ";
  private static final String SPACE_PREFIX = " ";

  // --------------------------------------------------------------------------

  /** The style of this comment. */
  private short _style = AUTO_STYLE;

  /** The main comment for this JDocComment. */
  private StringBuffer _comment = null;

  /** The maximum number of characters per line. */
  protected static final int MAX_LENGTH = 65;

  /** The maximum number of characters to indent comments. */
  protected static final int MAX_INDENT = 17;

  // --------------------------------------------------------------------------

  /**
   * Creates a new Java Comment.
   */
  public JComment() {
    super();

    _comment = new StringBuffer();
  }

  /**
   * Creates a new Java comment with the given style.
   * 
   * @param style The desired style.
   */
  public JComment(final short style) {
    this();

    _style = style;
  }

  // --------------------------------------------------------------------------

  /**
   * Appends the comment String to this JDocComment.
   *
   * @param comment The comment to append.
   */
  public void appendComment(final String comment) {
    _comment.append(comment);
  }

  /**
   * Sets the comment String of this JDocComment.
   *
   * @param comment The comment String of this JDocComment.
   */
  public void setComment(final String comment) {
    _comment.setLength(0);
    _comment.append(comment);
  }

  /**
   * Sets the style for this JComment.
   *
   * @param style The style to use for this JComment.
   */
  public void setStyle(final short style) {
    _style = style;
  }

  // --------------------------------------------------------------------------

  /**
   * Prints this JComment using the given JSourceWriter.
   *
   * @param jsw The JSourceWriter to print to.
   */
  public void print(final JSourceWriter jsw) {
    if (jsw == null) {
      return;
    }

    JCommentFormatter formatter = null;

    // -- calculate comment length
    short currentIndent = jsw.getIndentSize();
    int maxLength = MAX_LENGTH - currentIndent;

    // -- a simple check to make sure we have some room to print the comment
    if (maxLength <= MAX_INDENT) {
      maxLength = MAX_LENGTH / 2;
    }

    short resolvedStyle = _style;

    if (_style == AUTO_STYLE) {
      // -- estimation of number of lines
      int nbrLines = _comment.length() / maxLength;

      if (nbrLines > 2) {
        resolvedStyle = BLOCK_STYLE;
      } else {
        resolvedStyle = LINE_STYLE;
      }
    }

    // -- start comment
    String prefix = null;
    String start = null;
    String end = null;

    switch (resolvedStyle) {
      case BLOCK_STYLE:
        start = START_BLOCK;
        end = END_BLOCK;
        prefix = SPACE_PREFIX;
        break;
      case HEADER_STYLE:
        start = START_BLOCK;
        end = END_BLOCK;
        prefix = ASTERIX_PREFIX;
        break;
      case JAVADOC_STYLE:
        start = START_JAVADOC;
        end = END_JAVADOC;
        prefix = ASTERIX_PREFIX;
        break;
      default: // -- LINE
        prefix = LINE_COMMENT_PREFIX;
        break;
    }

    if (start != null) {
      jsw.writeln(start);
    }
    // -- print main comment
    formatter = new JCommentFormatter(_comment.toString(), maxLength, prefix);
    while (formatter.hasMoreLines()) {
      jsw.writeln(formatter.nextLine());
    }
    if (end != null) {
      jsw.writeln(end);
    }
    jsw.flush();
  }

  /**
   * {@inheritDoc}
   */
  public String toString() {
    return "";
  }

  // --------------------------------------------------------------------------
}
