Android Open Source - Jello Record

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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;
//from  w  w  w  .j a va 2s . co  m
import android.util.Poolable;

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

/*
 * This class is really messy and should be rewritten
 */
public class Record implements Poolable<Record> {
  private Record nextPoolable;
  private int id;
  private int schemaVersion;
  private final PageUsage[] pages;
  private int pagesUsed;

  @Inject
  static Injector injector;
  @Inject
  static @Named("maxRecordPages")
  int maxRecordPages;

  Record() {
    pages = new PageUsage[maxRecordPages];

    for (int i = 0; i < maxRecordPages; i++)
      pages[i] = new PageUsage();

    pagesUsed = 0;

  }

  public void clearUsage() {
    pagesUsed = 0;
    for (int i = 0; i < maxRecordPages; i++)
      if (pages[i].pageId != -1) {
        pages[i].pageId = -1;
        final int len = pages[i].usage.length;
        final byte[] u = pages[i].usage;
        for (int j = 0; j < len; j++)
          u[j] = 0;
      }
  }

  public int getId() {
    return id;
  }

  public Record getNextPoolable() {
    return nextPoolable;
  }

  public int getPagesUsed() {
    return pagesUsed;
  }

  public PageUsage getPageUsage(final int page) {
    int p = 0;
    for (int i = 0; i < maxRecordPages; i++)
      if (pages[i].pageId != -1) {
        if (p == page)
          return pages[i];
        p++;
      }

    throw new IllegalArgumentException("Record doesn't use so many pages ("
        + page + ")");
  }

  public int getSchemaVersion() {
    return schemaVersion;
  }

  public void setChunkUsed(final int pageId, final short start,
      final short end, final boolean used) {
    int index = -1;
    int empty = -1;
    for (int i = 0; i < maxRecordPages; i++) {
      if (pages[i].pageId == pageId) {
        index = i;
        break;
      }

      if (pages[i].pageId == -1 && empty == -1)
        empty = i;
    }

    if (index == -1) {
      if (empty == -1)
        throw new IllegalArgumentException("Record can use up to "
            + String.valueOf(maxRecordPages) + " pages");

      if (used == false)
        return;

      index = empty;
      pagesUsed++;
      pages[index].pageId = pageId;

    }

    if (used) {
      pages[index].blocksUsed += end - start;
      for (int i = start; i < end; i++)
        pages[index].usage[i / Byte.SIZE] |= 1 << i % Byte.SIZE;
    } else {
      pages[index].blocksUsed -= end - start;
      if (pages[index].blocksUsed == 0) {
        pages[index].pageId = -1;
        pagesUsed--;
      }
      for (int i = start; i < end; i++)
        pages[index].usage[i / Byte.SIZE] &= ~(1 << i % Byte.SIZE);
    }
  }

  public void setId(final int id) {
    this.id = id;
  }

  public void setNextPoolable(final Record element) {
    nextPoolable = element;
  }

  public void setPagesUsed(final int pagesUsed) {
    clearUsage();
    this.pagesUsed = pagesUsed;
    for (int i = 0; i < pagesUsed; i++)
      pages[i].pageId = 0;
  }

  public void setSchemaVersion(final int schemaVersion) {
    this.schemaVersion = schemaVersion;
  }

}

Java Source Code List