Android Open Source - logback-android-ui Tree Adapter

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License

The source code is released under:

Copyright (C) 2011-2012 Vanderbilt University Permission is hereby granted, free of charge, to any person obtaining a copy of this data, including any software or models in source or binary form, as ...

Java Source Code

/*Copyright (C) 2010-2012 Institute for Software Integrated Systems (ISIS)
This software was developed by the Institute for Software Integrated
Systems (ISIS) at Vanderbilt University, Tennessee, USA for the 
Transformative Apps program under DARPA, Contract # HR011-10-C-0175.
The United States Government has unlimited rights to this software. 
The US government has the right to use, modify, reproduce, release, 
perform, display, or disclose computer software or computer software 
documentation in whole or in part, in any manner and for any 
purpose whatsoever, and to have or authorize others to do so.
 *//*w ww .  jav a2 s. c  om*/
package edu.vu.isis.logger.util;

import java.util.ArrayList;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import edu.vu.isis.logger.lib.Tree;

/**
 * An adapter that properly pads a list of items to reflect their Tree
 * representation.
 * 
 * @author Nick King
 * 
 * @param <T>
 *            The type of object contained in the Tree that this Adapter wraps
 */
public class TreeAdapter<T> extends BaseAdapter {

  private LayoutInflater mInflater;
  private Tree<T> mObjects;
  private ArrayList<T> objList;
  private Context mContext;

  private int mResource;
  private int textViewId;

  private int leftPadding;
  private int topPadding;
  private int rightPadding;
  private int bottomPadding;

  public TreeAdapter(Tree<T> objects, Context context, int resource,
      int textViewResourceId) {

    refill(objects);

    mContext = context;
    textViewId = textViewResourceId;
    mResource = resource;
    mInflater = (LayoutInflater) context
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    leftPadding = 20;
    topPadding = rightPadding = bottomPadding = 5;
  }

  public void refill(Tree<T> objects) {

    mObjects = objects;

    objList = new ArrayList<T>();
    objList.add(objects.getPayload());
    objList = buildObjectList(objects, objects.getPayload(), objList);

  }

  @Override
  public int getCount() {
    return objList.size();
  }

  public Context getContext() {
    return mContext;
  }

  @Override
  public T getItem(int position) {
    return objList.get(position);
  }

  @Override
  public long getItemId(int position) {
    return position;
  }

  public void setLeftPadding(int padding) {
    leftPadding = padding;
  }

  public void setRightPadding(int padding) {
    rightPadding = padding;
  }

  public void setTopPadding(int padding) {
    topPadding = padding;
  }

  public void setBottomPadding(int padding) {
    bottomPadding = padding;
  }

  private ArrayList<T> buildObjectList(Tree<T> tree, T head, ArrayList<T> arr) {
    ArrayList<T> successorList = (ArrayList<T>) tree.getSuccessors(head);
    if (successorList == null) {
      return arr;
    } else {
      for (T successor : successorList) {
        Tree<T> subTree = tree.getTree(successor);
        arr.add(successor);
        buildObjectList(subTree, successor, arr);
      }
      return arr;
    }

  }

  @Override
  public View getView(int position, View convertView, ViewGroup group) {

    final ViewHolder holder;

    if (convertView == null) {
      convertView = mInflater.inflate(mResource, group, false);
      holder = new ViewHolder();

      try {
        holder.tv = (TextView) convertView.findViewById(textViewId);
      } catch (ClassCastException e) {
        Log.e("TreeAdapter",
            "You must supply a resource ID for a TextView");
        throw new IllegalStateException(
            "TreeAdapter requires the resource ID to be a TextView",
            e);
      }
      convertView.setTag(holder);
    } else {
      holder = (ViewHolder) convertView.getTag();
    }

    int nestLevel = getNestLevel(mObjects.getTree(objList.get(position)), 0);

    T item = getItem(position);
    if (item instanceof CharSequence) {
      holder.tv.setText((CharSequence) item);
    } else {
      holder.tv.setText(item.toString());
    }

    convertView.setPadding(leftPadding * nestLevel, topPadding,
        rightPadding, bottomPadding);

    return convertView;

  }

  public static class ViewHolder {
    public TextView tv;
  }

  private int getNestLevel(Tree<T> tree, int nestLvl) {
    Tree<T> parent = tree.getParent();
    if (parent == null) {
      return nestLvl;
    } else {
      return getNestLevel(parent, nestLvl + 1);
    }
  }

}

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