Android Open Source - Jello Simple Klass Manager

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License

The source code is released under:
Apache License
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Java Source Code

package com.atteo.jello.klass;
/* w  w w .  j a  v  a  2  s .  c o m*/
import java.util.ArrayList;

import android.util.Log;

import com.atteo.jello.index.Index;
import com.atteo.jello.index.IndexFactory;
import com.atteo.jello.schema.SchemaManager;
import com.atteo.jello.schema.SchemaManagerFactory;
import com.atteo.jello.space.SpaceManagerPolicy;
import com.atteo.jello.store.ListPage;
import com.atteo.jello.store.PagedFile;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;

@Singleton
public class SimpleKlassManager implements KlassManager {
  private final ArrayList<Integer> pageIds;
  private final ArrayList<KlassInfo> klasses;
  private final ListPage listPage;
  private final SpaceManagerPolicy spaceManagerPolicy;
  private final IndexFactory indexFactory;
  private final SchemaManagerFactory schemaManagerFactory;
  private final PagedFile pagedFile;

  @Inject
  public SimpleKlassManager(final IndexFactory indexFactory,
      final SchemaManagerFactory schemaManagerFactory,
      @Named("klassManagerPageId") final int klassManagerPageId,
      final ListPage listPage,
      final SpaceManagerPolicy spaceManagerPolicy,
      final PagedFile pagedFile) {
    pageIds = new ArrayList<Integer>();
    pageIds.add(klassManagerPageId);
    this.listPage = listPage;

    this.spaceManagerPolicy = spaceManagerPolicy;

    this.indexFactory = indexFactory;
    this.schemaManagerFactory = schemaManagerFactory;
    this.pagedFile = pagedFile;

    klasses = new ArrayList<KlassInfo>();

  }

  public void addKlass(final String klassName) {
    final KlassInfo klassInfo = new KlassInfo();
    klassInfo.index = null;
    klassInfo.schemaManager = null;
    klassInfo.schemaManagerPageId = spaceManagerPolicy.acquirePage();
    klassInfo.indexPageId = spaceManagerPolicy.acquirePage();
    klassInfo.name = klassName;
    klassInfo.nextId = 0;
    klasses.add(klassInfo);
  }

  public void commit() {
    int klassesOnPage = 0;
    int currentPage = 0;
    final int l = klasses.size();
    int free = listPage.getCapacity() - 4;
    listPage.position(4);
    for (int i = 0; i < l; i++) {
      final KlassInfo info = klasses.get(i);
      final int nameLength = info.name.length();
      if (free < nameLength + 16) {
        if (currentPage + 1 >= pageIds.size())
          pageIds.add(spaceManagerPolicy.acquirePage());
        listPage.setNext(pageIds.get(currentPage + 1));
        listPage.setId(pageIds.get(currentPage));
        listPage.reset();
        listPage.putInt(klassesOnPage);
        pagedFile.writePage(listPage);
        currentPage++;
        listPage.position(4);
        free = listPage.getCapacity();
        klassesOnPage = 0;
      }

      free -= nameLength + 16;
      klassesOnPage++;
      listPage.putInt(nameLength);
      listPage.putString(info.name);
      listPage.putInt(info.schemaManagerPageId);
      listPage.putInt(info.indexPageId);
      listPage.putInt(info.nextId);
    }

    listPage.setNext(ListPage.NO_MORE_PAGES);
    listPage.setId(pageIds.get(currentPage));
    listPage.position(0);
    listPage.putInt(klassesOnPage);
    pagedFile.writePage(listPage);

    for (int i = currentPage + 1; i < pageIds.size(); i++) {
      spaceManagerPolicy.releasePage(pageIds.get(i));
      pageIds.remove(i);
    }
  }

  public void create() {
    listPage.setNext(ListPage.NO_MORE_PAGES);
    listPage.setId(pageIds.get(0));
    listPage.reset();
    listPage.putInt(0);
    pagedFile.writePage(listPage);
  }

  public int getIdFor(final String klassName) {
    final int l = klasses.size();
    for (int i = 0; i < l; i++) {
      final KlassInfo storedKlass = klasses.get(i);
      if (klassName.equals(storedKlass.name)) {
        storedKlass.nextId++;
        return storedKlass.nextId - 1;
      }
    }
    throw new IllegalArgumentException("Class is not managed");
  }

  public Index getIndexFor(final String klassName) {
    final int l = klasses.size();
    for (int i = 0; i < l; i++)
      if (klassName.equals(klasses.get(i).name)) {
        if (klasses.get(i).index == null)
          klasses.get(i).index = indexFactory
              .create(klasses.get(i).indexPageId);
        return klasses.get(i).index;
      }

    return null;
  }

  public SchemaManager getSchemaManagerFor(final String klassName) {
    final int l = klasses.size();
    for (int i = 0; i < l; i++)
      if (klassName.equals(klasses.get(i).name)) {
        if (klasses.get(i).schemaManager == null)
          klasses.get(i).schemaManager = schemaManagerFactory
              .create(klasses.get(i).schemaManagerPageId);
        return klasses.get(i).schemaManager;
      }

    return null;
  }

  public boolean isKlassManaged(final String klassName) {
    final int l = klasses.size();
    for (int i = 0; i < l; i++)
      if (klassName.equals(klasses.get(i).name))
        return true;
    return false;
  }

  public boolean load() {
    int next;
    listPage.setId(pageIds.get(0));
    pagedFile.readPage(listPage);
    next = listPage.getNext();
    readKlassesFromPage(listPage);

    while (next != ListPage.NO_MORE_PAGES) {
      pageIds.add(next);
      listPage.setId(next);
      pagedFile.readPage(listPage);
      next = listPage.getNext();
      readKlassesFromPage(listPage);

    }

    return true;
  }

  public void removeKlass(final String klassName) {
    final int l = klasses.size();
    for (int i = 0; i < l; i++)
      if (klassName.equals(klasses.get(i).name)) {
        klasses.remove(i);
        break;
      }
  }

  private void readKlassesFromPage(final ListPage page) {
    page.reset();
    final int klassesOnPage = page.getInt();
    int l;
    for (int i = 0; i < klassesOnPage; i++) {
      final KlassInfo info = new KlassInfo();
      l = page.getInt();
      info.name = page.getString(l);
      info.schemaManagerPageId = page.getInt();
      info.indexPageId = page.getInt();
      info.nextId = page.getInt();
      info.schemaManager = schemaManagerFactory
          .create(info.schemaManagerPageId);
      info.schemaManager.load();
      info.index = indexFactory.create(info.indexPageId);
      Log.i("Jello", "loading index for class " + info.name);
      info.index.load();
      klasses.add(info);
    }
  }

  class KlassInfo {
    String name;
    int schemaManagerPageId;
    int indexPageId;
    int nextId;
    SchemaManager schemaManager;
    Index index;
  }

}
Java Source Code List
