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There is a newer version: 4.3.0
/*
 * Original Code Copyright Prime Technology.
 * Subsequent Code Modifications Copyright 2011-2014 ICEsoft Technologies Canada Corp. (c)
 *
 * 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.
 *
 * NOTE THIS CODE HAS BEEN MODIFIED FROM ORIGINAL FORM
 *
 * Subsequent Code Modifications have been made and contributed by ICEsoft Technologies Canada Corp. (c).
 *
 * Code Modification 1: Integrated with ICEfaces Advanced Component Environment.
 * Contributors: ICEsoft Technologies Canada Corp. (c)
 *
 * Code Modification 2: [ADD BRIEF DESCRIPTION HERE]
 * Contributors: ______________________
 * Contributors: ______________________
 */
package org.icefaces.ace.model.table;

import javax.faces.model.DataModel;
import java.io.Serializable;
import java.util.List;
import java.util.Map;

/**
 * Custom lazy loading DataModel to deal with huge datasets
 */
public abstract class LazyDataModel extends DataModel implements Serializable {

	private int rowIndex = -1;

	private int rowCount;

	private int pageSize = 1;

	private List data;

	public LazyDataModel() {
		super();
	}
	
	public boolean isRowAvailable() {
		if(data == null) {
            return false;
        }

		return rowIndex >= 0 && rowIndex < data.size();
	}

	public int getRowCount() {
		return rowCount;
	}

	public Object getRowData() {
        return data.get(rowIndex);
	}

    public int getRowIndex() {
        return this.rowIndex;
    }
    
    public void setRowIndex(int rowIndex) {
		if (pageSize == 0) this.rowIndex = rowIndex;
        else this.rowIndex = (rowIndex % pageSize);
    }

	public Object getWrappedData() {
		return data;
	}
	public void setWrappedData(Object list) {
		this.data = (List) list;
	}
	
	public int getPageSize() {
		return pageSize;
	}
	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}

    public void setRowCount(int rowCount) {
        this.rowCount = rowCount;
    }

    public abstract List load(int first, int pageSize, SortCriteria[] sortCriteria, Map filters);

	public List load(int first, int pageSize, SortCriteria[] sortCriteria, Map filters, Map minFilters, Map maxFilter) {
		return load(first, pageSize, sortCriteria, filters);
	}
}