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package com.jsoniter.any;

import com.jsoniter.ValueType;

import com.jsoniter.output.JsonStream;

import java.io.IOException;

import java.lang.reflect.Array;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

class ArrayWrapperAny extends Any {

private final Object val;

private List<Any> cache;

public ArrayWrapperAny(Object val) {

this.val = val;

}

@Override

public ValueType valueType() {

return ValueType.ARRAY;

}

@Override

public Object object() {

fillCache();

return cache;

}

@Override

public boolean toBoolean() {

return size() != 0;

}

@Override

public int toInt() {

return size();

}

@Override

public long toLong() {

return size();

}

@Override

public float toFloat() {

return size();

}

@Override

public double toDouble() {

return size();

}

@Override

public String toString() {

if (cache == null) {

return JsonStream.serialize(val);

} else {

fillCache();

return JsonStream.serialize(cache);

}

}

@Override

public void writeTo(JsonStream stream) throws IOException {

if (cache == null) {

stream.writeVal(val);

} else {

fillCache();

stream.writeVal(cache);

}

}

@Override

public int size() {

return Array.getLength(val);

}

@Override

public Any get(int index) {

return fillCacheUntil(index);

}

@Override

public Any get(Object[] keys, int idx) {

if (idx == keys.length) {

return this;

}

Object key = keys[idx];

if (isWildcard(key)) {

fillCache();

ArrayList<Any> result = new ArrayList<Any>();

for (Any element : cache) {

Any mapped = element.get(keys, idx + 1);

if (mapped.valueType() != ValueType.INVALID) {

result.add(mapped);

}

}

return Any.rewrap(result);

}

try {

return fillCacheUntil((Integer) key).get(keys, idx + 1);

} catch (IndexOutOfBoundsException e) {

return new NotFoundAny(keys, idx, object());

} catch (ClassCastException e) {

return new NotFoundAny(keys, idx, object());

}

}

@Override

public Iterator<Any> iterator() {

return new WrapperIterator();

}

private Any fillCacheUntil(int index) {

if (cache == null) {

cache = new ArrayList<Any>();

}

if (index < cache.size()) {

return cache.get(index);

}

for (int i = cache.size(); i < size(); i++) {

Any element = Any.wrap(Array.get(val, i));

cache.add(element);

if (index == i) {

return element;

}

}

return new NotFoundAny(index, val);

}

private void fillCache() {

if (cache == null) {

cache = new ArrayList<Any>();

}

int size = size();

if (cache.size() == size) {

return;

}

for (int i = cache.size(); i < size; i++) {

Any element = Any.wrap(Array.get(val, i));

cache.add(element);

}

}

private class WrapperIterator implements Iterator<Any> {

private int index;

private final int size;

private WrapperIterator() {

size = size();

}

@Override

public boolean hasNext() {

return index < size;

}

@Override

public Any next() {

if (cache == null) {

cache = new ArrayList<Any>();

}

if (index == cache.size()) {

cache.add(Any.wrap(Array.get(val, index)));

}

return cache.get(index++);

}

@Override

public void remove() {

throw new UnsupportedOperationException();

}

}

}