yap-6.3/packages/swig/android/JavaYap.java

/**** using sqlite
For example,the following:

import android.database.sqlite.SQLiteDatabase;

should be replaced with:

import org.sqlite.database.sqlite.SQLiteDatabase;

As well as replacing all uses of the classes in the android.database.sqlite.* namespace, the application must also be sure to use the following two:

org.sqlite.database.SQLException
org.sqlite.database.DatabaseErrorHandler

instead of:

android.database.SQLException
android.database.DatabaseErrorHandler

Aside from namespace changes, there are other differences from the stock Android interface that applications need to be aware of:

The SQLiteStatement.simpleQueryForBlobFileDescriptor() API is not available. The collation sequence "UNICODE" is not available. The collation sequence "LOCALIZED", which normally changes with the system's current locale, is always equivalent to SQLite's built in collation BINARY.

****/

import pt.up.fc.dcc.Yap.*;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.ScrollView;
import android.text.method.ScrollingMovementMethod;
import android.content.pm.PackageManager;
import android.content.pm.PackageInfo;
import  android.content.pm.PackageManager.NameNotFoundException;
import  android.util.Log;
import android.content.res.AssetManager;
import 	android.widget.EditText;
import 	java.text.ParseException;
import org.sqlite.database.sqlite.SQLiteDatabase;
import org.sqlite.database.sqlite.SQLiteStatement;
import org.sqlite.database.sqlite.SQLiteDatabaseCorruptException;
import org.sqlite.database.sqlite.SQLiteOpenHelper;

import org.sqlite.database.SQLException;
import org.sqlite.database.DatabaseErrorHandler;

class DoNotDeleteErrorHandler implements DatabaseErrorHandler {
    private static final String TAG = "DoNotDeleteErrorHandler";
    public void onCorruption(SQLiteDatabase dbObj) {
        Log.e(TAG, "Corruption reported by sqlite on database: " + dbObj.getPath());
    }
}

public class JavaYap extends Activity
{
    TextView outputText = null;
    ScrollView scroller = null;
    YAPEngine eng = null;
    EditText text;
    String str;
    String buf;
    YAPQuery q;
    Boolean running = false, compute = true;
    int i=1;
    YAPListTerm vs0;
    private AssetManager mgr;

    void runQuery(String str, Boolean more)
    {
        try
        {
            // check if at initial query
            if (!running) {

                            if (BuildConfig.DEBUG) {
                                Log.i(TAG, "query "+str);
                            }

	      q = eng.query( str );
                // get the uninstantiated query variables.
                vs0 = q.namedVars();
                running = true;
            }
            // start computing
            compute = true;

            if (BuildConfig.DEBUG) {
                Log.i(TAG, "onQueryButtonClick called");
            }

            Boolean rc = true;

            // text.setText("");
            if (vs0.nil()) {
                if (BuildConfig.DEBUG) {
                    Log.i(TAG, "q0=\n");
                }
                if (compute && (rc = q.next())) {
                    outputText.append( "yes\n" );
                    running = compute = more;
                } else {
                    outputText.append( "no\n" );
                    running = false;
                    compute = false;
                }
            } else {
                if (BuildConfig.DEBUG) {
                    Log.i(TAG, "q1= "+vs0.text()+"\n");
                }
                while (compute && (rc = q.next()) ) {
                    YAPListTerm vs = q.namedVars();
                    while(!vs.nil()){
                        if (BuildConfig.DEBUG) {
                            Log.i(TAG, "q= "+vs0.text()+"\n");
                        }
                        YAPTerm eq = vs.car();
                        //outputText.append(Integer.toString(i) + ": " + eq.text() );
                        outputText.append(Integer.toString(i++));
                        outputText.append(":\t" + eq.getArg(1).text() + " = " + eq.getArg(2).text() +"\n" );
                        vs = vs.cdr();
                    }
                    compute = more;
                }
            }
            if ( !rc) {
                q.close();
                compute = true;
                running = false;
            }
        } catch(Exception e){
            outputText.append("Exception thrown  :" + e);
            q.close();
            compute = true;
            running = false;
        }
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        String s = null;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        try {
            PackageManager m = getPackageManager();
            s = getPackageName();
            PackageInfo p = m.getPackageInfo(s, 0);
            //s = p.applicationInfo.dataDir;
            mgr = getResources().getAssets();
            Log.i(TAG, "mgr0=" +mgr + " " + s);
            load(mgr);
        } catch(NameNotFoundException e) {
            Log.e(TAG, "Couldn't find package  information in PackageManager", e);
        }
        Log.i(TAG, "mgr=" +mgr);

        text = (EditText)findViewById(R.id.EditText01);
        outputText = (TextView)findViewById(R.id.OutputText);
        outputText.setText("Application " + s + "\nPress 'Query' to start...\n");
        outputText.setMovementMethod(new ScrollingMovementMethod());
        scroller = (ScrollView)findViewById(R.id.Scroller);
        if (BuildConfig.DEBUG) {
            Log.i(TAG, "window making done");
        }
        eng = new YAPEngine(  );
        if (BuildConfig.DEBUG) {
            Log.i(TAG, "engine done");
        }
        if (BuildConfig.DEBUG) {
            Log.i(TAG, "onClearButtonClick called");
        }
        JavaCallback callback = new JavaCallback( outputText );
        // set the Java Callback
        if (BuildConfig.DEBUG) {
            Log.i(TAG, "before setting callback");
        }
        eng.setYAPCallback(callback);
        if (BuildConfig.DEBUG) {
	  Log.i(TAG, "callback done");
        }
    }

    public void onClearButtonClick(View view)
    {
        if (BuildConfig.DEBUG) {
            Log.i(TAG, "onClearButtonClick called");
        }
        // Ensure scroll to end of text
        scroller.post(new Runnable() {
            public void run() {
	      scroller.fullScroll(ScrollView.FOCUS_DOWN);
	      if (running) {
		q.close();
		q = null;
	      }
	      running = false;
	      text.setText("");
            }
        });
    }

    public void onFirstButtonClick(View view)
    {
        if (BuildConfig.DEBUG) {
            Log.i(TAG, "onQueryButtonClick called");
        }
        // Ensure scroll to end of text
        scroller.post(new Runnable() {
            public void run() {
                scroller.fullScroll(ScrollView.FOCUS_DOWN);
                str = text.getText().toString();
                //outputText.append("?- " + str+"\n\n");
                Log.i(TAG, "onQueryAnyButtonClick "+str + "\n");
                runQuery(str, false);
            }
        });
    }

    public void onAllButtonClick(View view)
    {
        if (BuildConfig.DEBUG) {
            Log.i(TAG, "onQueryButtonClick called");
        }
        // Ensure scroll to end of text
        scroller.post(new Runnable() {
            public void run() {
                scroller.fullScroll(ScrollView.FOCUS_DOWN);
                str = text.getText().toString();
                outputText.append("?- " + str + "\n\n");
                Log.i(TAG, "onAllButtonClick "+str + "\n");
                runQuery(str, true);
            }
        });
    }



    /** static constructor */
    static {
        System.loadLibrary("android");
        System.loadLibrary("log");
        System.loadLibrary("gmp");
        System.loadLibrary("sqlite3");
        System.loadLibrary("utf8proc");
        System.loadLibrary("Yap");
        System.loadLibrary("Yap++");
        System.loadLibrary("YapDroid");
    }

    private static native void load(AssetManager mgr);

    private static final String TAG = "JavaYap";

}

class JavaCallback extends YAPCallback
{
    TextView output;

    public JavaCallback( TextView outputText )
    {
        super();
        output =  outputText;
        Log.i(TAG, "java callback init");
    }

    public void run(String s)
    {
        Log.i(TAG, "java callback ");
        output.append(s);
    }

    private static final String TAG = "JavaCallback";

}