/*
 * 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.awt.font.LineMetrics;

final class StandardTextSource extends TextSource {

    private final char[] chars;
    private final int start;
    private final int len;
    private final int cstart;
    private final int clen;
    private final int level; // assumed all uniform
    private final int flags; // see GlyphVector.java
    private final Font font;
    private final FontRenderContext frc;
    private final CoreMetrics cm;

    
Create a simple implementation of a TextSource.
Chars is an array containing clen chars in the context, in
logical order, contiguously starting at cstart.  Start and len
represent that portion of the context representing the true
source; start, like cstart, is relative to the start of the
character array.
Level is the bidi level (0-63 for the entire context. Flags is
the layout flags. Font is the font, frc is the render context,
and lm is the line metrics for the entire source text, but not
necessarily the context.
/**
     * Create a simple implementation of a TextSource.
     *
     * Chars is an array containing clen chars in the context, in
     * logical order, contiguously starting at cstart.  Start and len
     * represent that portion of the context representing the true
     * source; start, like cstart, is relative to the start of the
     * character array.
     *
     * Level is the bidi level (0-63 for the entire context. Flags is
     * the layout flags. Font is the font, frc is the render context,
     * and lm is the line metrics for the entire source text, but not
     * necessarily the context.
     */
    StandardTextSource(char[] chars,
                       int start,
                       int len,
                       int cstart,
                       int clen,
                       int level,
                       int flags,
                       Font font,
                       FontRenderContext frc,
                       CoreMetrics cm) {
    if (chars == null) {
      throw new IllegalArgumentException("bad chars: null");
    }
    if (cstart < 0) {
      throw new IllegalArgumentException("bad cstart: " + cstart);
    }
    if (start < cstart) {
      throw new IllegalArgumentException("bad start: " + start + " for cstart: " + cstart);
    }
    if (clen < 0) {
      throw new IllegalArgumentException("bad clen: " + clen);
    }
    if (cstart + clen > chars.length) {
      throw new IllegalArgumentException("bad clen: " + clen + " cstart: " + cstart + " for array len: " + chars.length);
    }
    if (len < 0) {
      throw new IllegalArgumentException("bad len: " + len);
    }
    if ((start + len) > (cstart + clen)) {
      throw new IllegalArgumentException("bad len: " + len + " start: " + start + " for cstart: " + cstart + " clen: " + clen);
    }
    if (font == null) {
      throw new IllegalArgumentException("bad font: null");
    }
    if (frc == null) {
      throw new IllegalArgumentException("bad frc: null");
    }

    this.chars = chars;
    this.start = start;
    this.len = len;
    this.cstart = cstart;
    this.clen = clen;
    this.level = level;
    this.flags = flags;
    this.font = font;
    this.frc = frc;

    if (cm != null) {
        this.cm = cm;
    } else {
        LineMetrics metrics = font.getLineMetrics(chars, cstart, clen, frc);
        this.cm = ((FontLineMetrics)metrics).cm;
    }
  }

  // TextSource API

  public char[] getChars() {
    return chars;
  }

  public int getStart() {
    return start;
  }

  public int getLength() {
    return len;
  }

  public int getContextStart() {
    return cstart;
  }

  public int getContextLength() {
    return clen;
  }

  public int getLayoutFlags() {
    return flags;
  }

  public int getBidiLevel() {
    return level;
  }

  public Font getFont() {
    return font;
  }

  public FontRenderContext getFRC() {
    return frc;
  }

  public CoreMetrics getCoreMetrics() {
    return cm;
  }

  public TextSource getSubSource(int start, int length, int dir) {
    if (start < 0 || length < 0 || (start + length) > len) {
      throw new IllegalArgumentException("bad start (" + start + ") or length (" + length + ")");
    }

    int level = this.level;
    if (dir != TextLineComponent.UNCHANGED) {
        boolean ltr = (flags & 0x8) == 0;
        if (!(dir == TextLineComponent.LEFT_TO_RIGHT && ltr) &&
                !(dir == TextLineComponent.RIGHT_TO_LEFT && !ltr)) {
            throw new IllegalArgumentException("direction flag is invalid");
        }
        level = ltr? 0 : 1;
    }

    return new StandardTextSource(chars, this.start + start, length, cstart, clen, level, flags, font, frc, cm);
  }

  public String toString() {
    return toString(WITH_CONTEXT);
  }

  public String toString(boolean withContext) {
    StringBuilder sb = new StringBuilder(super.toString());
    sb.append("[start:");
    sb.append(start);
    sb.append(", len:" );
    sb.append(len);
    sb.append(", cstart:");
    sb.append(cstart);
    sb.append(", clen:" );
    sb.append(clen);
    sb.append(", chars:\"");
    int chStart, chLimit;
    if (withContext == WITH_CONTEXT) {
        chStart = cstart;
        chLimit = cstart + clen;
    }
    else {
        chStart = start;
        chLimit = start + len;
    }
    for (int i = chStart; i < chLimit; ++i) {
      if (i > chStart) {
        sb.append(" ");
      }
      sb.append(Integer.toHexString(chars[i]));
    }
    sb.append("\"");
    sb.append(", level:");
    sb.append(level);
    sb.append(", flags:");
    sb.append(flags);
    sb.append(", font:");
    sb.append(font);
    sb.append(", frc:");
    sb.append(frc);
    sb.append(", cm:");
    sb.append(cm);
    sb.append("]");

    return sb.toString();
  }
}