Java example source code file (TextSource.java)

This example Java source code file (TextSource.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, coremetrics, font, fontrendercontext, string, textsource, with_context, without_context

The TextSource.java Java example source code

/*
 * Copyright (c) 1998, 2003, 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.
 */
/*
 *
 * (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;

/**
 * A text source represents text for rendering, plus context information.
 * All text in the source uses the same font, metrics, and render context,
 * and is at the same bidi level.
 */

public abstract class TextSource {
  /** Source character data. */
  public abstract char[] getChars();

  /** Start of source data in char array returned from getChars. */
  public abstract int getStart();

  /** Length of source data. */
  public abstract int getLength();

  /** Start of context data in char array returned from getChars. */
  public abstract int getContextStart();

  /** Length of context data. */
  public abstract int getContextLength();

  /** Return the layout flags */
  public abstract int getLayoutFlags();

  /** Bidi level of all the characters in context. */
  public abstract int getBidiLevel();

  /** Font for source data. */
  public abstract Font getFont();

  /** Font render context to use when measuring or rendering source data. */
  public abstract FontRenderContext getFRC();

  /** Line metrics for source data. */
  public abstract CoreMetrics getCoreMetrics();

  /** Get subrange of this TextSource. dir is one of the TextLineComponent constants */
  public abstract TextSource getSubSource(int start, int length, int dir);

  /** Constant for toString(boolean).  Indicates that toString should not return info
      outside of the context of this instance. */
  public static final boolean WITHOUT_CONTEXT = false;

  /** Constant for toString(boolean).  Indicates that toString should return info
      outside of the context of this instance. */
  public static final boolean WITH_CONTEXT = true;

  /** Get debugging info about this TextSource instance. Default implementation just
      returns toString.  Subclasses should implement this to match the semantics of
      the toString constants. */
  public abstract String toString(boolean withContext);
}