Android Open Source - Jello Header Page

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Back to project page Jello.

License

The source code is released under:

Apache License

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Java Source Code

package com.atteo.jello.store;
//from w w w . j a  v  a2  s  .c o m
import java.util.Arrays;

import com.google.inject.Inject;
import com.google.inject.name.Named;

public class HeaderPage extends Page {
  private short pageSize;
  private short blockSize;

  private int freeSpaceInfoPageId;
  private int klassManagerPageId;

  private int fileFormatVersion;
  private final byte[] magic;

  @Inject
  private HeaderPage(@Named("pageSize") final short pageSize,
      @Named("blockSize") final short blockSize,
      @Named("freeSpaceInfoPageId") final int freeSpaceInfoPageId,
      @Named("klassManagerPageId") final int klassManagerPageId,
      @Named("fileFormatVersion") final int fileFormatVersion,
      @Named("magic") final String magic) {
    super();

    this.pageSize = pageSize;
    this.blockSize = blockSize;
    this.freeSpaceInfoPageId = freeSpaceInfoPageId;
    this.klassManagerPageId = klassManagerPageId;
    this.fileFormatVersion = fileFormatVersion;
    this.magic = magic.getBytes();

    byteBuffer.put(magic.getBytes());
    byteBuffer.putInt(fileFormatVersion);
    byteBuffer.putShort(pageSize);
    byteBuffer.putShort(blockSize);
    byteBuffer.putInt(freeSpaceInfoPageId);
    byteBuffer.putInt(klassManagerPageId);
  }

  public short getBlockSize() {
    return blockSize;
  }

  public int getFileFormatVersion() {
    return fileFormatVersion;
  }

  public int getFreeSpaceInfoPageId() {
    return freeSpaceInfoPageId;
  }

  public int getKlassManagerPageId() {
    return klassManagerPageId;
  }

  public short getPageSize() {
    return pageSize;
  }

  public boolean load() {
    final byte[] readMagic = new byte[magic.length];
    byteBuffer.position(0);
    byteBuffer.get(readMagic);
    if (!Arrays.equals(readMagic, magic))
      return false;

    fileFormatVersion = byteBuffer.getInt();
    pageSize = byteBuffer.getShort();
    blockSize = byteBuffer.getShort();
    freeSpaceInfoPageId = byteBuffer.getInt();
    klassManagerPageId = byteBuffer.getInt();

    return true;
  }

}

Java Source Code List