/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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 org.hawkular.alerts.api.model.paging;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Spliterator;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.function.UnaryOperator;
import java.util.stream.Stream;
/**
* A read-only list representing a single page of some results.
*
* <p>Contains a reference to the paging state object that describes the position of the page in some overall results.
*
* @author Lukas Krejci
* @since 0.0.1
*/
public final class Page<T> implements List<T> {
private final List<T> wrapped;
private final PageContext pageContext;
private final long totalSize;
public Page(List<T> wrapped, PageContext pageContext, long totalSize) {
this.wrapped = wrapped;
this.pageContext = pageContext;
this.totalSize = totalSize;
}
/**
* @return the information about the page of the results that this object represents
*/
public PageContext getPageContext() {
return pageContext;
}
/**
* @return the total number of results of which this page is a subset of
*/
public long getTotalSize() {
return totalSize;
}
@Override
public boolean add(T t) {
throw new UnsupportedOperationException();
}
@Override
public void add(int index, T element) {
throw new UnsupportedOperationException();
}
@Override
public boolean addAll(Collection<? extends T> c) {
throw new UnsupportedOperationException();
}
@Override
public boolean addAll(int index, Collection<? extends T> c) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
throw new UnsupportedOperationException();
}
@Override
public boolean contains(Object o) {
return wrapped.contains(o);
}
@Override
public boolean containsAll(Collection<?> c) {
return wrapped.containsAll(c);
}
@Override
public boolean equals(Object o) {
return wrapped.equals(o);
}
@Override
public T get(int index) {
return wrapped.get(index);
}
@Override
public int hashCode() {
return wrapped.hashCode();
}
@Override
public int indexOf(Object o) {
return wrapped.indexOf(o);
}
@Override
public boolean isEmpty() {
return wrapped.isEmpty();
}
@Override
public Iterator<T> iterator() {
Iterator<T> it = wrapped.iterator();
return new Iterator<T>() {
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public T next() {
return it.next();
}
};
}
@Override
public int lastIndexOf(Object o) {
return wrapped.lastIndexOf(o);
}
@Override
public ListIterator<T> listIterator() {
ListIterator<T> it = wrapped.listIterator();
return new ListIterator<T>() {
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public T next() {
return it.next();
}
@Override
public boolean hasPrevious() {
return it.hasPrevious();
}
@Override
public T previous() {
return it.previous();
}
@Override
public int nextIndex() {
return it.nextIndex();
}
@Override
public int previousIndex() {
return it.previousIndex();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public void set(T t) {
throw new UnsupportedOperationException();
}
@Override
public void add(T t) {
throw new UnsupportedOperationException();
}
};
}
@Override
public ListIterator<T> listIterator(int index) {
return wrapped.listIterator(index);
}
@Override
public T remove(int index) {
throw new UnsupportedOperationException();
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
@Override
public void replaceAll(UnaryOperator<T> operator) {
throw new UnsupportedOperationException();
}
@Override
public boolean retainAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
@Override
public T set(int index, T element) {
throw new UnsupportedOperationException();
}
@Override
public int size() {
return wrapped.size();
}
@Override
public void sort(Comparator<? super T> c) {
throw new UnsupportedOperationException();
}
@Override
public Spliterator<T> spliterator() {
return wrapped.spliterator();
}
@Override
public List<T> subList(int fromIndex, int toIndex) {
return new Page<>(wrapped.subList(fromIndex, toIndex), Pager.unlimited(pageContext.getOrder()), totalSize);
}
@Override
public Object[] toArray() {
return wrapped.toArray();
}
@Override
public <T1> T1[] toArray(T1[] a) {
return wrapped.toArray(a);
}
@Override
public Stream<T> parallelStream() {
return wrapped.parallelStream();
}
@Override
public boolean removeIf(Predicate<? super T> filter) {
throw new UnsupportedOperationException();
}
@Override
public Stream<T> stream() {
return wrapped.stream();
}
@Override
public void forEach(Consumer<? super T> action) {
wrapped.forEach(action);
}
}