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package org.apache.tuscany.sca.osgi.remoteserviceadmin;

import org.osgi.framework.Bundle;

/**
 * 
 * Provides the event information for a Remote Admin event.
 * 
 * @Immutable
 */
public class RemoteServiceAdminEvent {
    /**
     * Add an import registration. The Remote Services Admin will call this
     * method when it imports a service. When this service is registered, the
     * Remote Service Admin must notify the listener of all existing Import
     * Registrations.
     * 
     */
    public static final int IMPORT_REGISTRATION = 1;

    /**
     * Add an export registration. The Remote Services Admin will call this
     * method when it exports a service. When this service is registered, the
     * Remote Service Admin must notify the listener of all existing Export
     * Registrations.
     */
    public static final int EXPORT_REGISTRATION = 2;

    /**
     * Remove an export registration. The Remote Services Admin will call this
     * method when it removes the export of a service.
     * 
     */
    public static final int EXPORT_UNREGISTRATION = 3;

    /**
     * Remove an import registration. The Remote Services Admin will call this
     * method when it removes the import of a service.
     * 
     */
    public static final int IMPORT_UNREGISTRATION = 4;

    /**
     * A fatal importing error occurred. The Import Registration has been
     * closed.
     */
    public static final int IMPORT_ERROR = 5;

    /**
     * A fatal exporting error occurred. The Export Registration has been
     * closed.
     */
    public static final int EXPORT_ERROR = 6;

    /**
     * A problematic situation occurred, the export is still active.
     */
    public static final int EXPORT_WARNING = 7;
    /**
     * A problematic situation occurred, the import is still active.
     */
    public static final int IMPORT_WARNING = 8;

    private final ImportRegistration importRegistration;
    private final ExportRegistration exportRegistration;
    private final Throwable exception;
    private final int type;
    private final Bundle source;

    /**
     * Private constructor.
     * 
     * @param type The event type
     * @param source The source bundle, must not be <code>null</code>.
     * @param importRegistration The importRegistration, can be <code>null</code>.
     * @param exportRegistration The exportRegistration, can be <code>null</code>.
     * @param exception Any exceptions encountered, can be <code>null</code>
     */
    RemoteServiceAdminEvent(int type,
                            Bundle source,
                            ImportRegistration importRegistration,
                            ExportRegistration exportRegistration,
                            Throwable exception) {
        this.type = type;
        this.source = source;
        this.importRegistration = importRegistration;
        this.exportRegistration = exportRegistration;
        this.exception = exception;
    }

    /**
     * Create a Remote Service Admin Event for an export issue.
     * 
     * @param type The event type
     * @param source The source bundle, must not be <code>null</code>.
     * @param exportRegistration The exportRegistration, can not be <code>null</code>.
     * @param exception Any exceptions encountered, can be <code>null</code>
     */
    public RemoteServiceAdminEvent(int type, Bundle source, ExportRegistration exportRegistration, Throwable exception) {
        this(type, source, null, exportRegistration, exception);
    }

    /**
     * Create a Remote Service Admin Event for an import issue.
     * 
     * @param type The event type
     * @param source The source bundle, must not be <code>null</code>.
     * @param importRegistration The importRegistration, can not be <code>null</code>.
     * @param exception Any exceptions encountered, can be <code>null</code>
     */
    public RemoteServiceAdminEvent(int type, Bundle source, ImportRegistration importRegistration, Throwable exception) {
        this(type, source, importRegistration, null, exception);
    }

    /**
     * @return the importRegistration or <code>null</code>
     */
    public ImportRegistration getImportRegistration() {
        return importRegistration;
    }

    /**
     * @return the exportRegistration or <code>null</code>
     */
    public ExportRegistration getExportRegistration() {
        return exportRegistration;
    }

    /**
     * @return the exception or <code>null</code>
     */
    public Throwable getException() {
        return exception;
    }

    /**
     * @return the type
     */
    public int getType() {
        return type;
    }

    /**
     * @return the source
     */
    public Bundle getSource() {
        return source;
    }
}