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A Library for Using, Editing, and Creating SFNT-based Fonts
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/*
 * Copyright 2010 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.typography.font.sfntly.table;

import com.google.typography.font.sfntly.data.ReadableFontData;
import com.google.typography.font.sfntly.data.WritableFontData;

import java.io.IOException;

/**
 * An abstract builder base for byte array based tables.
 *
 * @author Stuart Gill
 */
public abstract class ByteArrayTableBuilder extends TableBasedTableBuilder<
    T> {

  /**
   * Constructor.
   *
   * @param header
   * @param data
   */
  protected ByteArrayTableBuilder(Header header, WritableFontData data) {
    super(header, data);
  }

  /**
   * Constructor.
   *
   * @param header
   * @param data
   */
  protected ByteArrayTableBuilder(Header header, ReadableFontData data) {
    super(header, data);
  }

  /**
   * Get the byte value at the specified index. The index is relative to the
   * start of the table.
   *
   * @param index
   *     index relative to the start of the table
   * @return byte value at the given index
   * @throws IOException
   */
  public int byteValue(int index) throws IOException {
    ReadableFontData data = this.internalReadData();
    if (data == null) {
      throw new IOException("No font data for the table.");
    }
    return data.readByte(index);
  }

  /**
   * Get the byte value at the specified index. The index is relative to the
   * start of the table.
   *
   * @param index
   *     index relative to the start of the table
   * @param b
   *     byte value to tset
   * @throws IOException
   */
  public void setByteValue(int index, byte b) throws IOException {
    WritableFontData data = this.internalWriteData();
    if (data == null) {
      throw new IOException("No font data for the table.");
    }
    data.writeByte(index, b);
  }

  /**
   * Get the number of bytes set for this table. It may include padding bytes at
   * the end.
   *
   * @return number of bytes for the table
   * @throws IOException
   */
  public int byteCount() throws IOException {
    ReadableFontData data = this.internalReadData();
    if (data == null) {
      throw new IOException("No font data for the table.");
    }
    return data.length();
  }

}