Android Open Source - GuiLib Open Filter

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License

The source code is released under:

Apache License

Java Source Code

package com.gandulf.guilib.data;
// ww w  .j  a  v  a 2  s .co m
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import android.text.TextUtils;
import android.widget.Filter;

public class OpenFilter<T> extends Filter {

  protected String constraint;

  protected OpenArrayAdapter<T> list;

  /**
   * 
   */
  public OpenFilter(OpenArrayAdapter<T> list) {
    this.list = list;
  }

  /*
   * (non-Javadoc)
   * 
   * @see android.widget.Filter#performFiltering(java.lang.CharSequence)
   */
  @Override
  protected FilterResults performFiltering(CharSequence cons) {
    // NOTE: this function is *always* called from a background thread,
    // and not the UI thread.

    FilterResults result = new FilterResults();

    if (list.mOriginalValues == null) {
      synchronized (list.mLock) {
        list.mOriginalValues = list.mObjects;
        list.mObjects = new ArrayList<T>(list.mObjects);
      }
    }

    if (!TextUtils.isEmpty(cons)) {
      this.constraint = cons.toString().toLowerCase(Locale.GERMAN);
    } else {
      this.constraint = null;
    }

    if (isFilterSet()) {

      final List<T> values = list.mOriginalValues;
      final int count = values.size();
      final ArrayList<T> filt = new ArrayList<T>(count);

      for (int i = 0; i < count; i++) {
        T m = values.get(i);

        if (filter(m)) {
          filt.add(m);
        }
      }

      result.count = filt.size();
      result.values = filt;

    } else {
      synchronized (list.mLock) {
        result.values = list.mOriginalValues;
        result.count = list.mOriginalValues.size();
      }
    }
    return result;

  }

  protected boolean isFilterSet() {
    return constraint != null;
  }

  public boolean filter(T m) {
    boolean valid = true;

    if (constraint != null && m.toString().toLowerCase(Locale.GERMAN).startsWith(constraint)) {
      valid &= true;
    }

    return valid;
  }

  /*
   * (non-Javadoc)
   * 
   * @see android.widget.Filter#publishResults(java.lang.CharSequence, android.widget.Filter.FilterResults)
   */
  @SuppressWarnings("unchecked")
  @Override
  protected void publishResults(CharSequence constraint, FilterResults results) {
    list.mObjects = (List<T>) results.values;

    if (results.count > 0) {
      list.notifyDataSetChanged(false);
    } else {
      list.notifyDataSetInvalidated();
    }
  }

}

Java Source Code List

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