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package com.datastax.data.dataset;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.HashMap;
import java.util.Map;


public abstract class DataCommand {
    
    private String shortDescription;
    
    
    private static final Object UNDEFINED = new Object();
    
    
    private Map params = new HashMap();
    
    
    private PropertyChangeSupport pcs = new PropertyChangeSupport(this);
    
    
    public void setShortDescription(String shortDescription) {
        this.shortDescription = shortDescription == null ? "" : shortDescription;
    }
    
    
    public String getShortDescription() {
        return shortDescription;
    }
    
    
    public void setParameter(String name, Object value) {
        params.put(name, value);
    }
    
    
    public void clearParameter(String name) {
        params.put(name, UNDEFINED);
    }
    
    
    public void clearParameters() {
        for (String name : params.keySet()) {
            params.put(name, UNDEFINED);
        }
    }
    
    
    public Object getParameter(String name) {
        return params.get(name);
    }
    
    
    public abstract String[] getParameterNames();
    
    
    public Object[] getParameterValues() {
        return params.values().toArray();
    }

    protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
	pcs.firePropertyChange(propertyName, oldValue, newValue);
    }
    
    
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        pcs.addPropertyChangeListener(listener);
    }

    
    public void addPropertyChangeListener(String propertyName,
            PropertyChangeListener listener) {
        pcs.addPropertyChangeListener(propertyName, listener);
    }
    
    
    public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
    	pcs.removePropertyChangeListener(propertyName, listener);
    }
}