Android Open Source - Jello Paged File Native

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.store;
//from   w  w  w  .j  a v  a 2  s .  c  o m
import java.io.File;
import java.io.IOException;

import com.atteo.jello.Jello;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;

@Singleton
public class PagedFileNative implements PagedFile {
  private boolean readOnly;
  private final short pageSize;
  private final File file;

  static {
    System.loadLibrary("PagedFileNative");
  }

  @Inject
  public PagedFileNative(@Named("pageSize") final short pageSize,
      @Named("fullpath") final String fullpath) {
    this.pageSize = pageSize;

    file = new File(fullpath);

    init();
  }

  synchronized native public int addPages(int count);

  synchronized native public void close();

  public boolean create() {
    file.getParentFile().mkdirs();
    if (!file.getParentFile().exists())
      return false;
    try {
      file.createNewFile();
    } catch (final IOException e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }

  public boolean exists() {
    return file.exists();
  }

  native public long getFileLength();

  native public int getPageCount();

  public boolean isReadOnly() {
    return readOnly;
  }

  synchronized public int open() {
    if (!file.exists())
      return Jello.OPEN_FAILED;

    if (!file.canRead())
      return Jello.OPEN_FAILED;

    readOnly = !file.canWrite();

    try {
      openNative(file.getCanonicalPath(), readOnly, pageSize);
    } catch (final IOException e) {
      e.printStackTrace();
      return Jello.OPEN_FAILED;
    }

    if (readOnly)
      return Jello.OPEN_READONLY;
    else
      return Jello.OPEN_SUCCESS;
  }

  native public void readPage(Page page);

  public void remove() {
    file.delete();
  }

  synchronized native public void removePages(int count);

  native public void syncAll();

  native public void syncPages(int startPage, int count);

  synchronized native public void writePage(Page page);

  private native void init();

  native private int openNative(String fullpath, boolean readOnly,
      short pageSize) throws IOException;

  @Override
  protected void finalize() {
    close();
  }

}

Java Source Code List