/*
 * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.traccar.helper;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Parser {

    private int position = 1;
    private Matcher matcher;

    public Parser(Pattern pattern, String input) {
        matcher = pattern.matcher(input);
    }

    public boolean matches() {
        return matcher.matches();
    }

    public boolean hasNext() {
        if (matcher.group(position) != null) {
            return true;
        } else {
            position++;
            return false;
        }
    }

    public String next() {
        return matcher.group(position++);
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

    public int nextInt(int radix) {
        return Integer.parseInt(next(), radix);
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }

    // Format: (degrees)(minutes)(hemisphere)
    public double nextCoordinate() {
        double coordinate = nextDouble();
        coordinate += nextDouble() / 60;
        String hemisphere = next();
        if (hemisphere.equals("S") || hemisphere.equals("W")) {
            coordinate = -coordinate;
        }
        return coordinate;
    }

}

@@ -1272,39 +1272,26 @@
  return 
-Integer.parseInt(next()
+nextInt(10
 );%0A    %7D
@@ -1324,24 +1324,53 @@
 nt radix) %7B%0A
+        if (hasNext()) %7B%0A    
         retu
@@ -1405,16 +1405,65 @@
 radix);%0A
+        %7D else %7B%0A            return 0;%0A        %7D%0A
     %7D%0A%0A 
@@ -1490,24 +1490,53 @@
 tDouble() %7B%0A
+        if (hasNext()) %7B%0A    
         retu
@@ -1566,16 +1566,67 @@
 ext());%0A
+        %7D else %7B%0A            return 0.0;%0A        %7D%0A
     %7D%0A%0A 

Handle empty capture groups