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 * Portions Copyrighted 2012 Sun Microsystems, Inc.
 */
package org.netbeans.modules.css.visual;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

/**
 * Descriptor of a filter.
 *
 * @author Jan Stola
 */
public class Filter {
    /** Name of the property fired when the pattern changes. */
    public static final String PROPERTY_PATTERN = "pattern"; // NOI18N
    /** Pattern of this filter. */
    private String pattern;
    /** Property change support. */
    private PropertyChangeSupport changeSupport = new PropertyChangeSupport(this);

    /**
     * Returns the pattern of this filter.
     *
     * @return pattern of this filter.
     */
    public String getPattern() {
        return pattern;
    }

    /**
     * Sets the pattern of this filter.
     *
     * @param pattern new pattern of this filter.
     */
    void setPattern(String pattern) {
        String oldPattern = this.pattern;
        this.pattern = pattern;
        changeSupport.firePropertyChange(PROPERTY_PATTERN, oldPattern, pattern);
    }

    /**
     * Registers a property change listener.
     *
     * @param listener listener to register.
     */
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        changeSupport.addPropertyChangeListener(listener);
    }

    /**
     * Unregisters a property change listener.
     *
     * @param listener listener to unregister.
     */
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        changeSupport.removePropertyChangeListener(listener);
    }

    /**
     * Unregisters all previously registered property change listeners.
     */
    public void removePropertyChangeListeners() {
        for (PropertyChangeListener listener : changeSupport.getPropertyChangeListeners()) {
            removePropertyChangeListener(listener);
        }
    }

}
