com.networknt.schema.utils.SetView Maven / Gradle / Ivy
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package com.networknt.schema.utils;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Set;
/**
* View of a list of sets.
*
* This is used for performance to reduce copies but breaks the semantics of the
* set where the elements must all be unique.
*
* @param the type contains in the set
*/
public class SetView implements Set {
private final List> sets = new ArrayList<>();
/**
* Adds a set to the view.
*
* @param set to add to the view
* @return the view
*/
public SetView union(Set set) {
if (set != null && !set.isEmpty()) {
this.sets.add(set);
}
return this;
}
@Override
public int size() {
int size = 0;
for (Set set : sets) {
size += set.size();
}
return size;
}
@Override
public boolean isEmpty() {
return sets.isEmpty();
}
@Override
public boolean contains(Object o) {
for (Set set : sets) {
if (set.contains(o)) {
return true;
}
}
return false;
}
@Override
public Iterator iterator() {
return new SetViewIterator<>(this);
}
@Override
public Object[] toArray() {
int size = size();
Object[] result = new Object[size];
Iterator iterator = iterator();
for (int x = 0; x < size; x++) {
result[x] = iterator.hasNext() ? iterator.next() : null;
}
return result;
}
@SuppressWarnings("unchecked")
@Override
public T[] toArray(T[] a) {
int size = size();
T[] result = size <= a.length ? a : (T[]) Array.newInstance(a.getClass().getComponentType(), size);
Iterator iterator = iterator();
for (int x = 0; x < size; x++) {
result[x] = iterator.hasNext() ? (T) iterator.next() : null;
}
return result;
}
@Override
public boolean containsAll(Collection c) {
for (Object e : c) {
if (!contains(e)) {
return false;
}
}
return true;
}
@Override
public boolean add(E e) {
throw new UnsupportedOperationException();
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
@Override
public boolean addAll(Collection coll) {
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(Collection coll) {
throw new UnsupportedOperationException();
}
@Override
public boolean retainAll(Collection coll) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
throw new UnsupportedOperationException();
}
/**
* Iterator.
*
* @param the type contains in the set
*/
public static class SetViewIterator implements Iterator {
private Iterator> sets = null;
private Iterator current = null;
public SetViewIterator(SetView view) {
this.sets = view.sets.iterator();
if (this.sets.hasNext()) {
this.current = this.sets.next().iterator();
}
}
@Override
public boolean hasNext() {
if (this.current.hasNext()) {
return true;
}
while (this.sets.hasNext()) {
this.current = this.sets.next().iterator();
if (this.current.hasNext()) {
return true;
}
}
return false;
}
@Override
public E next() {
return this.current.next();
}
}
@Override
public int hashCode() {
return Objects.hash(sets);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Set)) {
return false;
}
Collection collection = (Collection) obj;
if (collection.size() != size()) {
return false;
}
try {
return containsAll(collection);
} catch (ClassCastException ignore) {
return false;
} catch (NullPointerException ignore) {
return false;
}
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append('[');
Iterator iterator = iterator();
if (iterator.hasNext()) {
builder.append(iterator.next().toString());
}
while (iterator.hasNext()) {
builder.append(", ");
builder.append(iterator.next().toString());
}
builder.append(']');
return builder.toString();
}
}