com.evolveum.midpoint.web.component.util.ListDataProvider.java Source code

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Here is the source code for com.evolveum.midpoint.web.component.util.ListDataProvider.java

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/*
 * Copyright (c) 2010-2013 Evolveum
 *
 * 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.evolveum.midpoint.web.component.util;

import com.evolveum.midpoint.web.component.data.BaseSortableDataProvider;
import com.evolveum.midpoint.web.util.WebMiscUtil;
import org.apache.commons.lang.Validate;
import org.apache.wicket.Component;
import org.apache.wicket.model.IModel;

import java.io.Serializable;
import java.util.Iterator;
import java.util.List;

/**
 * @author lazyman
 */
public class ListDataProvider<T extends Serializable> extends BaseSortableDataProvider<T> {

    private IModel<List<T>> model;

    public ListDataProvider(Component Component, IModel<List<T>> model) {
        super(Component);

        Validate.notNull(model);
        this.model = model;
    }

    @Override
    public Iterator<? extends T> internalIterator(long first, long count) {
        getAvailableData().clear();

        List<T> list = model.getObject();
        if (list != null) {
            for (long i = first; i < first + count; i++) {
                if (i < 0 || i >= list.size()) {
                    throw new ArrayIndexOutOfBoundsException(
                            "Trying to get item on index " + i + " but list size is " + list.size());
                }
                getAvailableData().add(list.get(WebMiscUtil.safeLongToInteger(i)));
            }
        }

        return getAvailableData().iterator();
    }

    @Override
    protected int internalSize() {
        List<T> list = model.getObject();
        if (list == null) {
            return 0;
        }

        return list.size();
    }
}