Android Open Source - Jello Storable Collection

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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;
/*w  w w .j a  va 2 s .  c o  m*/
import java.util.ArrayList;

import android.util.Log;

import com.atteo.jello.index.Index;
import com.atteo.jello.klass.KlassManager;
import com.google.inject.Inject;

public class StorableCollection<T extends Storable> {
  private String orderBy = null;
  private Expression where = null;
  private Class<T> klass;
  private ArrayList<T> arrayList = null;
  
  @Inject
  static private KlassManager klassManager;

  public StorableCollection(Class<T> klass) {
    this.klass = klass;
  }

  public StorableCollection<T> where(Expression expression) {
    arrayList = null;
    if (where == null)
      where = expression;
    else
      where = new Expression(where, Expression.OPERATOR_AND, expression);
    return this;
  }

  public StorableCollection<T> orderBy(String orderBy) {
    arrayList = null;
    this.orderBy = orderBy;
    return this;
  }

  public T getFirst() {
    ArrayList<T> list = toArrayList();
    if (list.size() == 0)
      return null;
    else
      return list.get(0);
  }

  public int getCount() {
    return toArrayList().size();
  }

  public <S extends Storable> StorableCollection<S> children(Class<S> klass,
      String field) {
    StorableCollection<S> result = new StorableCollection<S>(klass);
    result.where(new Expression(field, Expression.OPERATOR_IN, this));
    return result;
  }

  public void createArrayList() {
    arrayList = new ArrayList<T>();
    String klassName = klass.getCanonicalName();

    Index index = klassManager.getIndexFor(klassName);
    
    index.iterate();
    int nextId = index.nextId();
    
    while(nextId != -1){
      T storable = StorableFactory.createStorable(klass);
      storable.setId(nextId);
      storable.load();

      if (where == null)
        arrayList.add(storable);
      else {
        if (where.evaluate(storable))
          arrayList.add(storable);

      }
      nextId = index.nextId();
    }
  }
  
  public ArrayList<T> toArrayList() {
    if (arrayList == null)
      createArrayList();
    return arrayList;
  }
}

Java Source Code List