package pt.utl.ist.fenix.tools.util;

import java.util.Properties;

public class MultiProperty extends Properties {

    @Override
    public synchronized Object put(final Object key, final Object value) {
        final StringBuilder result = new StringBuilder();
        final String property = getProperty((String) key);
        addValues(result, property);
        addValues(result, (String) value);
        return super.put(key, result.toString());
    }

    private void addValues(final StringBuilder result, final String value) {
        if (value != null && !value.isEmpty()) {
            final String[] properties = value.split(",");
            for (final String property : properties) {
                final String trimmed = property.trim();
                if (result.indexOf(trimmed) < 0) {
                    if (result.length() > 0) {
                        result.append(",");
                    }
                    result.append(trimmed);
                }
            }
        }
    }

}