org.paxml.util.CachedIterator.java Source code

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Here is the source code for org.paxml.util.CachedIterator.java

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/**
 * This file is part of PaxmlCore.
 *
 * PaxmlCore is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PaxmlCore is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with PaxmlCore.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.paxml.util;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.collections.iterators.AbstractIteratorDecorator;

public class CachedIterator<T> extends AbstractIteratorDecorator {

    private int cacheSize;

    public CachedIterator(int cacheSize, Iterator iterator) {
        super(iterator);

        setCacheSize(cacheSize);
    }

    public int getCacheSize() {
        return cacheSize;
    }

    @Override
    public List<T> next() {
        List<T> r = new ArrayList<T>(cacheSize);
        for (int i = 0; i < cacheSize && super.hasNext(); i++) {
            r.add((T) super.next());
        }
        return r;

    }

    public void setCacheSize(int cacheSize) {
        if (cacheSize < 1) {
            cacheSize = 1;
        }
        this.cacheSize = cacheSize;
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException("Remove unsupported");
    }

}