/*
* Copyright 2012 Objectos, Fábrica de Software LTDA.
*
* 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 br.com.objectos.way.ui;
import static com.google.common.collect.Lists.newArrayList;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import br.com.objectos.way.relational.Page;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
/**
* @author marcio.endo@objectos.com.br (Marcio Endo)
*/
public class PageList<T> {
private final boolean empty;
private final List<T> rows;
private final Pager pager;
public PageList(List<T> rows) {
this.empty = rows.isEmpty();
this.rows = rows;
this.pager = new PagerJson(rows);
}
public PageList(List<T> rows, Pager pager) {
this.empty = rows.isEmpty();
this.rows = rows;
this.pager = pager;
}
public static <T> PageList<T> of() {
List<T> list = ImmutableList.of();
return new PageList<T>(list);
}
public static <T> PageList<T> of(Iterable<T> rows) {
List<T> list = ImmutableList.copyOf(rows);
return new PageList<T>(list);
}
public PageList<T> filter(Predicate<T> predicate) {
List<T> filtered = FluentIterable.from(rows)
.filter(predicate)
.toList();
return PageList.of(filtered);
}
public PageList<T> page(RequestWrapper wrapper) {
Page page = wrapper.getPage();
List<T> limit = page.limit(rows);
Pager nextPager = pager.to(page);
return new PageList<T>(limit, nextPager);
}
public PageList<T> sort(Comparator<? super T> comparator) {
List<T> rows = getRows();
ArrayList<T> mutable = newArrayList(rows);
Collections.sort(mutable, comparator);
return new PageList<T>(mutable, pager);
}
public <E> PageList<E> transform(Function<T, E> function) {
List<E> lazy = Lists.transform(rows, function);
List<E> rows = ImmutableList.copyOf(lazy);
return new PageList<E>(rows, pager);
}
public Context toContext(String var) {
return Context.of()
.put(var, this);
}
public boolean isEmpty() {
return empty;
}
public List<T> getRows() {
return rows;
}
public Pager getPager() {
return pager;
}
public int size() {
return rows.size();
}
}