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ArrayLazyAny.java
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262 lines (234 loc) · 6.71 KB
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package com.jsoniter.any;
import com.jsoniter.*;
import com.jsoniter.output.JsonStream;
import com.jsoniter.spi.JsonException;
import com.jsoniter.spi.TypeLiteral;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
class ArrayLazyAny extends LazyAny {
private final static TypeLiteral<List<Any>> typeLiteral = new TypeLiteral<List<Any>>() {
};
private List<Any> cache;
private int lastParsedPos;
public ArrayLazyAny(byte[] data, int head, int tail) {
super(data, head, tail);
lastParsedPos = head;
}
@Override
public ValueType valueType() {
return ValueType.ARRAY;
}
@Override
public Object object() {
fillCache();
return cache;
}
@Override
public boolean toBoolean() {
JsonIterator iter = parse();
try {
return CodegenAccess.readArrayStart(iter);
} catch (IOException e) {
throw new JsonException(e);
} finally {
JsonIteratorPool.returnJsonIterator(iter);
}
}
@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 BigInteger toBigInteger() {
return BigInteger.valueOf(size());
}
@Override
public BigDecimal toBigDecimal() {
return BigDecimal.valueOf(size());
}
@Override
public int size() {
fillCache();
return cache.size();
}
@Override
public Iterator<Any> iterator() {
if (lastParsedPos == tail) {
return cache.iterator();
} else {
return new LazyIterator();
}
}
@Override
public Any get(int index) {
try {
return fillCacheUntil(index);
} catch (IndexOutOfBoundsException e) {
return new NotFoundAny(index, object());
}
}
@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());
}
}
private void fillCache() {
if (lastParsedPos == tail) {
return;
}
if (cache == null) {
cache = new ArrayList<Any>(4);
}
JsonIterator iter = JsonIteratorPool.borrowJsonIterator();
try {
iter.reset(data, lastParsedPos, tail);
if (lastParsedPos == head) {
if (!CodegenAccess.readArrayStart(iter)) {
lastParsedPos = tail;
return;
}
cache.add(iter.readAny());
}
while (CodegenAccess.nextToken(iter) == ',') {
cache.add(iter.readAny());
}
lastParsedPos = tail;
} catch (IOException e) {
throw new JsonException(e);
} finally {
JsonIteratorPool.returnJsonIterator(iter);
}
}
private Any fillCacheUntil(int target) {
if (lastParsedPos == tail) {
return cache.get(target);
}
if (cache == null) {
cache = new ArrayList<Any>(4);
}
int i = cache.size();
if (target < i) {
return cache.get(target);
}
JsonIterator iter = JsonIteratorPool.borrowJsonIterator();
try {
iter.reset(data, lastParsedPos, tail);
if (lastParsedPos == head) {
if (!CodegenAccess.readArrayStart(iter)) {
lastParsedPos = tail;
throw new IndexOutOfBoundsException();
}
Any element = iter.readAny();
cache.add(element);
if (target == 0) {
lastParsedPos = CodegenAccess.head(iter);
return element;
}
i = 1;
}
while (CodegenAccess.nextToken(iter) == ',') {
Any element = iter.readAny();
cache.add(element);
if (i++ == target) {
lastParsedPos = CodegenAccess.head(iter);
return element;
}
}
lastParsedPos = tail;
} catch (IOException e) {
throw new JsonException(e);
} finally {
JsonIteratorPool.returnJsonIterator(iter);
}
throw new IndexOutOfBoundsException();
}
private class LazyIterator implements Iterator<Any> {
private Any next;
private int index;
public LazyIterator() {
index = 0;
try {
next = fillCacheUntil(index);
} catch (IndexOutOfBoundsException e) {
next = null;
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public boolean hasNext() {
return next != null;
}
@Override
public Any next() {
if (next == null) {
throw new IndexOutOfBoundsException();
}
Any current = next;
try {
index++;
next = fillCacheUntil(index);
} catch (IndexOutOfBoundsException e){
next = null;
}
return current;
}
}
@Override
public void writeTo(JsonStream stream) throws IOException {
if (lastParsedPos == head) {
super.writeTo(stream);
} else {
// there might be modification
fillCache();
stream.writeVal(typeLiteral, cache);
}
}
@Override
public String toString() {
if (lastParsedPos == head) {
return super.toString();
} else {
fillCache();
return JsonStream.serialize(cache);
}
}
}