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Thymeleaf Layout Dialect rewritten in java.

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/*
 * Copyright 2019, Emanuel Rabina (http://www.ultraq.net.nz/)
 *
 * 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 nz.net.ultraq.thymeleaf.models.extensions;

import java.util.Iterator;
import org.thymeleaf.model.IModel;
import org.thymeleaf.model.ITemplateEvent;

/**
 * An iterator that treats a model as a queue of events.
 */
public class EventIterator implements Iterator {

    private final IModel model;
    private int currentIndex = 0;

    public EventIterator(IModel model) {
        this.model = model;
    }

    @Override
    public boolean hasNext() {
        return currentIndex < model.size();
    }

    @Override
    public ITemplateEvent next() {
        return model.get(currentIndex++);
    }

    // TODO: Not needed from Java 8 onwards - default method does this
    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }

}