model.java

package tmp;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Model {
    
    public Map<String, Class> parameterTypes;
    
    public Map<String, Object> defaultValues;
    
    public Map<String, Object> currentValues;
    
    public Model(List<IGenerator> generators) {
        parameterTypes = new HashMap<String, Class>();
        defaultValues = new HashMap<String, Object>();
        currentValues = new HashMap<String, Object>();
        for (IGenerator generator : generators) {
            for (String parameterName : generator.getParameterNames()) {
                register(parameterName, 
                        generator.getParameterType(parameterName),
                        generator.getParameterDefault(parameterName));
            }
        }
    }
    
    public void register(String parameter, Class type, Object defaultValue) {
        parameterTypes.put(parameter, type);
        defaultValues.put(parameter, defaultValue);
    }
    
    public Object get(String parameterName) {
        if (currentValues.containsKey(parameterName)) {
            return currentValues.get(parameterName);
        } else {
            return defaultValues.get(parameterName);
        }
    }
    
    public void set(String parameterName, Object value) throws Exception {
        Class requiredClass = parameterTypes.get(parameterName);
        if (value.getClass() == requiredClass) {
            currentValues.put(parameterName, value);
        } else {
            throw new Exception();
        }
    }

}