Android Open Source - android-bubble-text Auto Complete Manager

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License

The source code is released under:
MIT License
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Java Source Code

package com.oliveira.bubble;
//from   w  w w . j  a v  a  2 s.c  o  m
import android.os.Handler;
import android.text.TextUtils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicInteger;

public class AutoCompleteManager {

    private Resolver resolver;
    private String latestQuery;
    private Handler handler;
    boolean tryToBeSmart;

    public AutoCompleteManager() {
        handler = new Handler();
        tryToBeSmart = true;
    }

    public void setResolver(Resolver resolver) {
        this.resolver = resolver;
    }

    public interface Resolver {
        public ArrayList<AutoCompletePopover.Entity> getSuggestions(String query) throws Exception;

        public ArrayList<AutoCompletePopover.Entity> getDefaultSuggestions();

        public void update(String query, ArrayList<AutoCompletePopover.Entity> results);
    }

    public void search(String query) {

        latestQuery = query;
        if (query != null) {

            if (query.trim().length() < 3) {
                query = "";
            }

            new SearchTask(query).start();

        } else {
            new SearchTask(null).start();
        }
    }

    private AtomicInteger searchVenueTaskCount = new AtomicInteger(0);

    private HashMap<String, ArrayList<AutoCompletePopover.Entity>> queriesSoFar =
            new HashMap<String, ArrayList<AutoCompletePopover.Entity>>();

    private class SearchTask {

        private String query = null;

        private SearchTask(String query) {
            if (query != null)
                this.query = query.trim();
        }

        protected void onPreExecute() {
            searchVenueTaskCount.incrementAndGet();
        }

        protected ArrayList<AutoCompletePopover.Entity> doInBackground() {
            try {
                ArrayList<AutoCompletePopover.Entity> results = resolver.getSuggestions(query);
                if (results != null && !TextUtils.isEmpty(query))
                    queriesSoFar.put(query, results);
                return results;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        protected void onCancelled() {
            decrement();
        }

        protected void onPostExecute(ArrayList<AutoCompletePopover.Entity> results) {
            if (resolver != null && results != null && (latestQuery.startsWith(query) || latestQuery.equals(query))) {
                resolver.update(query, results);
            }
            decrement();
        }

        private void execute() {
            onPreExecute();
            Thread t = new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        final ArrayList<AutoCompletePopover.Entity> results = doInBackground();
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                onPostExecute(results);
                            }
                        });
                    } catch (Throwable t) {
                        onCancelled();
                    }
                }
            });
            t.setPriority(Thread.MIN_PRIORITY);
            t.start();
        }

        private void decrement() {
            searchVenueTaskCount.decrementAndGet();
        }

        public void start() {

            if (TextUtils.isEmpty(query) && resolver != null) {
                resolver.update("", resolver.getDefaultSuggestions());
                return;
            }

            boolean alreadyQueriedSomethingSimilar = false;
            for (java.util.Map.Entry<String, ArrayList<AutoCompletePopover.Entity>> e : queriesSoFar.entrySet()) {
                if (tryToBeSmart && query.startsWith(e.getKey()) && e.getValue().size() == 0) {
                    alreadyQueriedSomethingSimilar = true;
                    break;
                } else if (query.equals(e.getKey()) && e.getValue().size() > 0) {
                    alreadyQueriedSomethingSimilar = true;
                    if (resolver != null) {
                        resolver.update(query, e.getValue());
                    }
                    break;
                }
            }

            if (!alreadyQueriedSomethingSimilar) {
                this.execute();
            }
        }
    }
}
Java Source Code List
