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ReadableNativeMap.java
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ReadableNativeMap.java
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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
package com.facebook.react.bridge;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.facebook.infer.annotation.Assertions;
import com.facebook.jni.HybridData;
import com.facebook.proguard.annotations.DoNotStrip;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Implementation of a read-only map in native memory. This will generally be constructed and filled
* in native code so you shouldn't construct one yourself.
*/
@DoNotStrip
public class ReadableNativeMap extends NativeMap implements ReadableMap {
static {
ReactBridge.staticInit();
}
protected ReadableNativeMap(HybridData hybridData) {
super(hybridData);
}
private @Nullable String[] mKeys;
private @Nullable HashMap<String, Object> mLocalMap;
private @Nullable HashMap<String, ReadableType> mLocalTypeMap;
private static int mJniCallCounter;
public static int getJNIPassCounter() {
return mJniCallCounter;
}
private void ensureKeysAreImported() {
if (mKeys != null) {
return;
}
synchronized (this) {
mKeys = Assertions.assertNotNull(importKeys());
mJniCallCounter++;
}
}
private HashMap<String, Object> getLocalMap() {
if (mLocalMap != null) {
return mLocalMap;
}
synchronized (this) {
ensureKeysAreImported();
if (mLocalMap == null) {
Object[] values = Assertions.assertNotNull(importValues());
mJniCallCounter++;
int length = mKeys.length;
mLocalMap = new HashMap<>(length);
for (int i = 0; i < length; i++) {
mLocalMap.put(mKeys[i], values[i]);
}
}
}
return mLocalMap;
}
private native String[] importKeys();
private native Object[] importValues();
private @NonNull HashMap<String, ReadableType> getLocalTypeMap() {
if (mLocalTypeMap != null) {
return mLocalTypeMap;
}
synchronized (this) {
ensureKeysAreImported();
if (mLocalTypeMap == null) {
Object[] types = Assertions.assertNotNull(importTypes());
mJniCallCounter++;
int length = mKeys.length;
mLocalTypeMap = new HashMap<>(length);
for (int i = 0; i < length; i++) {
mLocalTypeMap.put(mKeys[i], (ReadableType) types[i]);
}
}
}
return mLocalTypeMap;
}
private native Object[] importTypes();
@Override
public boolean hasKey(@NonNull String name) {
return getLocalMap().containsKey(name);
}
@Override
public boolean isNull(@NonNull String name) {
if (getLocalMap().containsKey(name)) {
return getLocalMap().get(name) == null;
}
throw new NoSuchKeyException(name);
}
private @NonNull Object getValue(@NonNull String name) {
if (hasKey(name) && !(isNull(name))) {
return Assertions.assertNotNull(getLocalMap().get(name));
}
throw new NoSuchKeyException(name);
}
private <T> T getValue(String name, Class<T> type) {
Object value = getValue(name);
checkInstance(name, value, type);
return (T) value;
}
private @Nullable Object getNullableValue(String name) {
if (hasKey(name)) {
return getLocalMap().get(name);
}
return null;
}
private @Nullable <T> T getNullableValue(String name, Class<T> type) {
Object value = getNullableValue(name);
checkInstance(name, value, type);
return (T) value;
}
private void checkInstance(String name, Object value, Class type) {
if (value != null && !type.isInstance(value)) {
throw new UnexpectedNativeTypeException(
"Value for "
+ name
+ " cannot be cast from "
+ value.getClass().getSimpleName()
+ " to "
+ type.getSimpleName());
}
}
@Override
public boolean getBoolean(@NonNull String name) {
return getValue(name, Boolean.class).booleanValue();
}
@Override
public double getDouble(@NonNull String name) {
return getValue(name, Double.class).doubleValue();
}
@Override
public int getInt(@NonNull String name) {
// All numbers coming out of native are doubles, so cast here then truncate
return getValue(name, Double.class).intValue();
}
@Override
public long getLong(@NonNull String name) {
return getValue(name, Long.class).longValue();
}
@Override
public @Nullable String getString(@NonNull String name) {
return getNullableValue(name, String.class);
}
@Override
public @Nullable ReadableArray getArray(@NonNull String name) {
return getNullableValue(name, ReadableArray.class);
}
@Override
public @Nullable ReadableNativeMap getMap(@NonNull String name) {
return getNullableValue(name, ReadableNativeMap.class);
}
@Override
public @NonNull ReadableType getType(@NonNull String name) {
if (getLocalTypeMap().containsKey(name)) {
return Assertions.assertNotNull(getLocalTypeMap().get(name));
}
throw new NoSuchKeyException(name);
}
@Override
public @NonNull Dynamic getDynamic(@NonNull String name) {
return DynamicFromMap.create(this, name);
}
@Override
public @NonNull Iterator<Map.Entry<String, Object>> getEntryIterator() {
synchronized (this) {
ensureKeysAreImported();
final String[] iteratorKeys = mKeys;
final Object[] iteratorValues = Assertions.assertNotNull(importValues());
mJniCallCounter++;
return new Iterator<Map.Entry<String, Object>>() {
int currentIndex = 0;
@Override
public boolean hasNext() {
return currentIndex < iteratorKeys.length;
}
@Override
public Map.Entry<String, Object> next() {
final int index = currentIndex++;
return new Map.Entry<String, Object>() {
@Override
public String getKey() {
return iteratorKeys[index];
}
@Override
public Object getValue() {
return iteratorValues[index];
}
@Override
public Object setValue(Object value) {
throw new UnsupportedOperationException(
"Can't set a value while iterating over a ReadableNativeMap");
}
};
}
};
}
}
@Override
public @NonNull ReadableMapKeySetIterator keySetIterator() {
ensureKeysAreImported();
final String[] iteratorKeys = mKeys;
return new ReadableMapKeySetIterator() {
int currentIndex = 0;
@Override
public boolean hasNextKey() {
return currentIndex < iteratorKeys.length;
}
@Override
public String nextKey() {
return iteratorKeys[currentIndex++];
}
};
}
@Override
public int hashCode() {
return getLocalMap().hashCode();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof ReadableNativeMap)) {
return false;
}
ReadableNativeMap other = (ReadableNativeMap) obj;
return getLocalMap().equals(other.getLocalMap());
}
@Override
public @NonNull HashMap<String, Object> toHashMap() {
// we can almost just return getLocalMap(), but we need to convert nested arrays and maps to the
// correct types first
HashMap<String, Object> hashMap = new HashMap<>(getLocalMap());
Iterator iterator = hashMap.keySet().iterator();
while (iterator.hasNext()) {
String key = (String) iterator.next();
switch (getType(key)) {
case Null:
case Boolean:
case Number:
case String:
break;
case Map:
hashMap.put(key, Assertions.assertNotNull(getMap(key)).toHashMap());
break;
case Array:
hashMap.put(key, Assertions.assertNotNull(getArray(key)).toArrayList());
break;
default:
throw new IllegalArgumentException("Could not convert object with key: " + key + ".");
}
}
return hashMap;
}
}