/*

 * Copyright (c) 1998, 2015, 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

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/*

 *

 * (C) Copyright IBM Corp. 1998-2003 All Rights Reserved

 */

package sun.font;

import java.awt.Font;

import java.awt.font.FontRenderContext;

import java.text.Bidi;

  /**

   * A factory for text labels.  Basically this just holds onto the stuff that

   * doesn't change-- the render context, context, and bidi info for the context-- and gets

   * called for each subrange you want to create.

   *

   * @see Font

   * @see FontRenderContext

   * @see GlyphVector

   * @see TextLabel

   * @see ExtendedTextLabel

   * @see Bidi

   * @see TextLayout

   */

public final class TextLabelFactory {

  private final FontRenderContext frc;

  private final char[] text;

  private final Bidi bidi;

  private Bidi lineBidi;

  private final int flags;

  private int lineStart;

  private int lineLimit;

  /**

   * Initialize a factory to produce glyph arrays.

   * @param frc the FontRenderContext to use for the arrays to be produced.

   * @param text the text of the paragraph.

   * @param bidi the bidi information for the paragraph text, or null if the

   * entire text is left-to-right text.

   */

  public TextLabelFactory(FontRenderContext frc,

                          char[] text,

                          Bidi bidi,

                          int flags) {

    this.frc = frc;

    this.text = text.clone();

    this.bidi = bidi;

    this.flags = flags;

    this.lineBidi = bidi;

    this.lineStart = 0;

    this.lineLimit = text.length;

  }

  public FontRenderContext getFontRenderContext() {

    return frc;

  }

  public Bidi getLineBidi() {

    return lineBidi;

  }

  /**

   * Set a line context for the factory.  Shaping only occurs on this line.

   * Characters are ordered as they would appear on this line.

   * @param lineStart the index within the text of the start of the line.

   * @param lineLimit the index within the text of the limit of the line.

   */

  public void setLineContext(int lineStart, int lineLimit) {

    this.lineStart = lineStart;

    this.lineLimit = lineLimit;

    if (bidi != null) {

      lineBidi = bidi.createLineBidi(lineStart, lineLimit);

    }

  }

  /**

   * Create an extended glyph array for the text between start and limit.

   *

   * @param font the font to use to generate glyphs and character positions.

   * @param start the start of the subrange for which to create the glyph array

   * @param limit the limit of the subrange for which to create glyph array

   *

   * Start and limit must be within the bounds of the current line.  If no

   * line context has been set, the entire text is used as the current line.

   * The text between start and limit will be treated as though it all has

   * the same bidi level (and thus the same directionality) as the character

   * at start.  Clients should ensure that all text between start and limit

   * has the same bidi level for the current line.

   */

  public ExtendedTextLabel createExtended(Font font,

                                          CoreMetrics lm,

                                          Decoration decorator,

                                          int start,

                                          int limit) {

    if (start >= limit || start < lineStart || limit > lineLimit) {

      throw new IllegalArgumentException("bad start: " + start + " or limit: " + limit);

    }

    int level = lineBidi == null ? 0 : lineBidi.getLevelAt(start - lineStart);

    int linedir = (lineBidi == null || lineBidi.baseIsLeftToRight()) ? 0 : 1;

    int layoutFlags = flags & ~0x9; // remove bidi, line direction flags

    if ((level & 0x1) != 0) layoutFlags |= 1; // rtl

    if ((linedir & 0x1) != 0) layoutFlags |= 8; // line rtl

    TextSource source = new StandardTextSource(text, start, limit - start, lineStart, lineLimit - lineStart, level, layoutFlags, font, frc, lm);

    return new ExtendedTextSourceLabel(source, decorator);

  }

  /**

   * Create a simple glyph array for the text between start and limit.

   *

   * @param font the font to use to generate glyphs and character positions.

   * @param start the start of the subrange for which to create the glyph array

   * @param limit the limit of the subrange for which to create glyph array

   */

  public TextLabel createSimple(Font font,

                                CoreMetrics lm,

                                int start,

                                int limit) {

    if (start >= limit || start < lineStart || limit > lineLimit) {

      throw new IllegalArgumentException("bad start: " + start + " or limit: " + limit);

    }

    int level = lineBidi == null ? 0 : lineBidi.getLevelAt(start - lineStart);

    int linedir = (lineBidi == null || lineBidi.baseIsLeftToRight()) ? 0 : 1;

    int layoutFlags = flags & ~0x9; // remove bidi, line direction flags

    if ((level & 0x1) != 0) layoutFlags |= 1; // rtl

    if ((linedir & 0x1) != 0) layoutFlags |= 8; // line rtl

    TextSource source = new StandardTextSource(text, start, limit - start, lineStart, lineLimit - lineStart, level, layoutFlags, font, frc, lm);

    return new TextSourceLabel(source);

  }

}