com.aipo.mobycket.markup.repeater.data.CursorDataView.java Source code

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Here is the source code for com.aipo.mobycket.markup.repeater.data.CursorDataView.java

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/*
 * Copyright 2004-2014 Aimluck,Inc.
 *
 * 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.aipo.mobycket.markup.repeater.data;

import java.util.Iterator;
import java.util.NoSuchElementException;

import org.apache.wicket.markup.repeater.data.DataView;
import org.apache.wicket.markup.repeater.data.IDataProvider;
import org.apache.wicket.model.IModel;

/**
 * 
 */
public abstract class CursorDataView<T> extends DataView<T> {

    private static final long serialVersionUID = -6950961499058839407L;

    /**
     * @param id
     * @param dataProvider
     */
    protected CursorDataView(String id, IDataProvider<T> dataProvider) {
        super(id, dataProvider);
    }

    /**
     * @param id
     * @param dataProvider
     * @param itemsPerPage
     */
    protected CursorDataView(String id, IDataProvider<T> dataProvider, int itemsPerPage) {
        super(id, dataProvider, itemsPerPage);
    }

    @Override
    protected Iterator<IModel<T>> getItemModels() {
        int offset = getCurrentPage();
        int size = getViewSize();

        Iterator<IModel<T>> models = getItemModels(offset, size);

        models = new CappedIteratorAdapter<T>(models, size);

        return models;
    }

    private static class CappedIteratorAdapter<T> implements Iterator<IModel<T>> {
        private final int max;

        private int index;

        private final Iterator<IModel<T>> delegate;

        /**
         * Constructor
         * 
         * @param delegate
         *          delegate iterator
         * @param max
         *          maximum number of items that can be accessed.
         */
        public CappedIteratorAdapter(Iterator<IModel<T>> delegate, int max) {
            this.delegate = delegate;
            this.max = max;
        }

        /**
         * @see java.util.Iterator#remove()
         */
        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }

        /**
         * @see java.util.Iterator#hasNext()
         */
        @Override
        public boolean hasNext() {
            return (index < max) && delegate.hasNext();
        }

        /**
         * @see java.util.Iterator#next()
         */
        @Override
        public IModel<T> next() {
            if (index >= max) {
                throw new NoSuchElementException();
            }
            index++;
            return delegate.next();
        }

    };

}