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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.
/**
* The MIT License
*
* Copyright (c) 2009-2019 PrimeTek
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.primefaces.model;
import javax.validation.constraints.Null;
import java.util.*;
public class LazyDataModelIterator implements Iterator {
private LazyDataModel model;
private int index;
private Map> pages;
@Null
private String sortField;
@Null
private SortOrder sortOrder;
@Null
private List multiSortMeta;
@Null
private Map filters;
LazyDataModelIterator(LazyDataModel model) {
this.model = model;
this.index = -1;
this.pages = new HashMap>();
}
LazyDataModelIterator(LazyDataModel model, String sortField, SortOrder sortOrder, Map filters) {
this(model);
this.sortField = sortField;
this.sortOrder = sortOrder;
this.filters = filters;
}
LazyDataModelIterator(LazyDataModel model, List multiSortMeta, Map filters) {
this(model);
this.multiSortMeta = multiSortMeta;
this.filters = filters;
}
@Override
public boolean hasNext() {
int nextIndex = index + 1;
int pageNo = nextIndex / model.getPageSize();
if (!pages.containsKey(pageNo)) {
List page;
if (sortField != null || sortOrder != null) {
page = model.load(nextIndex, model.getPageSize(), sortField, sortOrder, filters);
}
else {
page = model.load(nextIndex, model.getPageSize(), multiSortMeta, filters);
}
if (page == null || page.isEmpty()) {
return false;
}
pages.remove(pageNo - 1);
pages.put(pageNo, page);
}
int pageIndex = nextIndex % model.getPageSize();
if (pageIndex < pages.get(pageNo).size()) {
return true;
}
return false;
}
@Override
public T next() {
index++;
int pageNo = index / model.getPageSize();
int pageIndex = index % model.getPageSize();
List page = pages.get(pageNo);
if (page == null || pageIndex >= page.size()) {
throw new NoSuchElementException();
}
return page.get(pageIndex);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}