/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.geronimo.gshell.event;

/**
 * Adapter for typed {@link Event} processing.
 *
 * @version $Rev$ $Date$
 */
public abstract class EventAdapter<T extends Event>
    implements EventListener
{
    @SuppressWarnings({"unchecked"})
    public void onEvent(final Event event) throws Exception {
        T targetEvent = null;

        // HACK: Can't check the type from T, so just handle the CCE, might not be very efficent though :-(
        try {
            targetEvent = (T)event;
        }
        catch (ClassCastException ignore) {}

        if (targetEvent != null) {
            handleEvent(targetEvent);
        }
    }

    protected abstract void handleEvent(T event) throws Exception;
}
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.geronimo.gshell.event;

/**
 * Adapter for typed {@link Event} processing.
 *
 * @version $Rev$ $Date$
 */
public abstract class EventAdapter<T extends Event>
    implements EventListener
{
    @SuppressWarnings({"unchecked"})
    public void onEvent(final Event event) throws Exception {
        assert event != null;

        // HACK: Can't check the type from T, so just handle the CCE, might not be very efficent though :-(
        try {
            handleEvent((T)event);
        }
        catch (ClassCastException ignore) {}
    }

    protected abstract void handleEvent(T event) throws Exception;
}
Revert back to first hack attempt, maybe need to implement a better event subscription model
Revert back to first hack attempt, maybe need to implement a better event subscription model


git-svn-id: cd28ba526fba5b39766c0a4e72305690b33c2c6e@702414 13f79535-47bb-0310-9956-ffa450edef68
