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The backport-spi library is backport of Service Provider Interface to Java5 with extra features.

There is a newer version: 1.0.1

/*
 *    Copyright 2010 The backport-spi Team
 *
 *    Licensed 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 com.googlecode.bspi;

import java.util.Iterator;
import java.util.Map.Entry;

/**
 * 
 *
 * @version $Id: ProviderIterator.java 3 2010-07-24 18:40:40Z simone.tripodi $
 * @param 
 */
final class ProviderIterator implements Iterator {

    private final Iterator> knownProviders;

    private final ServiceIterator serviceIterator;

    public ProviderIterator(Iterator> knownProviders,
            ServiceIterator serviceIterator) {
        this.knownProviders = knownProviders;
        this.serviceIterator = serviceIterator;
    }

    public boolean hasNext() {
        if (this.knownProviders.hasNext()) {
            return true;
        }
        return this.serviceIterator.hasNext();
    }

    public S next() {
        if (this.knownProviders.hasNext()) {
            return this.knownProviders.next().getValue();
        }
        return this.serviceIterator.next();
    }

    public void remove() {
        throw new UnsupportedOperationException();
    }

}