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Its an port to fix bugs in OSGi support. ... The Apache Commons Discovery 0.5 component is about discovering, or finding, implementations for pluggable interfaces.

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/*
 * 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.commons.discovery;

/**
 * Iterator over discovered SPI type.
 *
 * @param  The SPI type
 */
public abstract class ResourceClassIterator extends ResourceIterator {

    /**
     * Returns the next SPI Class in the iteration.
     *
     * @param  Any type extends T
     * @return The next SPI Class in the iteration
     */
    public abstract  ResourceClass nextResourceClass();

    /**
     * {@inheritDoc}
     */
    @Override
    public Resource nextResource() {
        return nextResourceClass();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String nextResourceName() {
        return nextResourceClass().getName();
    }

}