Android Open Source - Jello Database File

From Project

Back to project page Jello.
License

The source code is released under:
Apache License
If you think the Android project Jello listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package com.atteo.jello;
//from  ww  w  .  j av  a  2 s.  com
import java.util.HashMap;

import com.atteo.jello.klass.KlassManager;
import com.atteo.jello.space.SpaceManagerPolicy;
import com.atteo.jello.store.HeaderPage;
import com.atteo.jello.store.PagedFile;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Singleton;
import com.google.inject.name.Named;

@Singleton
public class DatabaseFile {
  private final PagedFile pagedFile;
  private HeaderPage headerPage;
  private SpaceManagerPolicy spaceManagerPolicy;

  private KlassManager klassManager;
  private final Injector injector;

  private final int headerPageId;
  private final int minimumPages;

  @Inject
  private DatabaseFile(final Injector injector, final PagedFile pagedFile,
      @Named("headerPageId") final int headerPageId,
      @Named("minimumPages") final int minimumPages) {

    this.injector = injector;
    this.pagedFile = pagedFile;
    this.headerPageId = headerPageId;
    this.minimumPages = minimumPages;
  }

  public void close() {
    pagedFile.close();
  }

  public HashMap<String, String> getReadProperties() {
    int mp = headerPage.getFreeSpaceInfoPageId();
    if (mp < headerPage.getKlassManagerPageId())
      mp = headerPage.getKlassManagerPageId();
    mp++;

    HashMap<String, String> properties = new HashMap<String, String>();
    properties.put("pageSize", String.valueOf(headerPage.getPageSize()));
    properties.put("blockSize", String.valueOf(headerPage.getBlockSize()));
    properties.put("freeSpaceInfoPageId", String.valueOf(headerPage.getFreeSpaceInfoPageId()));
    properties.put("klassManagerPageId", String.valueOf(headerPage.getKlassManagerPageId()));
    properties.put("fileFormatVersion", String.valueOf(headerPage.getFileFormatVersion()));
    properties.put("minimumPages", String.valueOf(mp));

    return properties;
  }

  public boolean createStructure() {
    if (pagedFile.addPages(minimumPages) != minimumPages - 1)
      return false;

    headerPage = injector.getInstance(HeaderPage.class);
    headerPage.setId(headerPageId);
    pagedFile.writePage(headerPage);

    spaceManagerPolicy = injector.getInstance(SpaceManagerPolicy.class);
    spaceManagerPolicy.create();
    for (int i = 0; i < minimumPages; i++)
      spaceManagerPolicy.setPageUsed(i, true);
    
    klassManager = injector.getInstance(KlassManager.class);
    klassManager.create();

    return true;
  }

  public PagedFile getPagedFile() {
    return pagedFile;
  }

  public SpaceManagerPolicy getSpaceManagerPolicy() {
    return spaceManagerPolicy;
  }

  public boolean loadHeader() {
    if (pagedFile.getPageCount() < minimumPages)
      return false;

    headerPage = injector.getInstance(HeaderPage.class);

    headerPage.setId(headerPageId);
    pagedFile.readPage(headerPage);
    if (!headerPage.load())
      return false;

    return true;
  }

  public boolean loadStructure() {
    spaceManagerPolicy = injector.getInstance(SpaceManagerPolicy.class);
    if (!spaceManagerPolicy.load())
      return false;
    klassManager = injector.getInstance(KlassManager.class);
    if (!klassManager.load())
      return false;

    return true;
  }

  /**
   * Either loadStructure or createStructure must be called in order for
   * isValid to return true
   * 
   * @return
   */
  public int open() {
    return pagedFile.open();
  }
}
Java Source Code List
