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com.eclipsesource.v8.utils.V8ObjectUtils Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2014 EclipseSource and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* EclipseSource - initial API and implementation
******************************************************************************/
package com.eclipsesource.v8.utils;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import com.eclipsesource.v8.V8;
import com.eclipsesource.v8.V8Array;
import com.eclipsesource.v8.V8ArrayBuffer;
import com.eclipsesource.v8.V8Object;
import com.eclipsesource.v8.V8TypedArray;
import com.eclipsesource.v8.V8Value;
import com.eclipsesource.v8.utils.typedarrays.ArrayBuffer;
import com.eclipsesource.v8.utils.typedarrays.Float32Array;
import com.eclipsesource.v8.utils.typedarrays.Float64Array;
import com.eclipsesource.v8.utils.typedarrays.Int16Array;
import com.eclipsesource.v8.utils.typedarrays.Int32Array;
import com.eclipsesource.v8.utils.typedarrays.Int8Array;
import com.eclipsesource.v8.utils.typedarrays.TypedArray;
import com.eclipsesource.v8.utils.typedarrays.UInt16Array;
import com.eclipsesource.v8.utils.typedarrays.UInt32Array;
import com.eclipsesource.v8.utils.typedarrays.UInt8Array;
import com.eclipsesource.v8.utils.typedarrays.UInt8ClampedArray;
/**
* A set of static helper methods to convert V8Objects / V8Arrays to
* java.util Maps and Lists and back again. These conversions
* perform a deep copy.
*/
public class V8ObjectUtils {
private static final Object IGNORE = new Object();
/**
* Creates a Map from a V8Object using a deep copy. All elements
* in the V8Object are released after they are accessed. However, the root
* object itself is not released.
*
* @param object The root of the V8Object graph.
*
* @return A map representing a deep copy of the V8Object rooted at 'object'.
*/
public static Map toMap(final V8Object object) {
V8Map cache = new V8Map();
try {
return toMap(object, cache);
} finally {
cache.release();
}
}
/**
* Creates a List from a V8Array using a deep copy. All elements
* in the V8Array are released after they are accessed. However, the root
* array itself is not released.
*
* @param array The root of the V8Array graph.
*
* @return A list representing a deep copy of the V8Array rooted at 'array'.
*/
public static List toList(final V8Array array) {
V8Map cache = new V8Map();
try {
return toList(array, cache);
} finally {
cache.release();
}
}
/**
* Populates a Java array from a V8Array. The type of the array must be specified.
* Currently, only INTEGER, DOUBLE, BOOLEAN and STRING are supported.
* The V8Array must only contain elements of type 'arrayType'. The result
* can be optionally passed in as a parameter.
*
* This method will use J2V8's bulk array copy making it faster than iterating over
* all the elements in the array.
*
* @param array The V8Array to convert to a Java Array.
* @param arrayType The type of the V8Array to convert.
* @param result The array to use as the result. If null, a new array will be created.
*
* @return A Java array representing a V8Array.
*/
public static Object getTypedArray(final V8Array array, final int arrayType, final Object result) {
int length = array.length();
if (arrayType == V8Value.INTEGER) {
int[] intArray = (int[]) result;
if ((intArray == null) || (intArray.length < length)) {
intArray = new int[length];
}
array.getIntegers(0, length, intArray);
return intArray;
} else if (arrayType == V8Value.DOUBLE) {
double[] doubleArray = (double[]) result;
if ((doubleArray == null) || (doubleArray.length < length)) {
doubleArray = new double[length];
}
array.getDoubles(0, length, doubleArray);
return doubleArray;
} else if (arrayType == V8Value.BOOLEAN) {
boolean[] booleanArray = (boolean[]) result;
if ((booleanArray == null) || (booleanArray.length < length)) {
booleanArray = new boolean[length];
}
array.getBooleans(0, length, booleanArray);
return booleanArray;
} else if (arrayType == V8Value.STRING) {
String[] stringArray = (String[]) result;
if ((stringArray == null) || (stringArray.length < length)) {
stringArray = new String[length];
}
array.getStrings(0, length, stringArray);
return stringArray;
} else if (arrayType == V8Value.BYTE) {
byte[] byteArray = (byte[]) result;
if ((byteArray == null) || (byteArray.length < length)) {
byteArray = new byte[length];
}
array.getBytes(0, length, byteArray);
return byteArray;
}
throw new RuntimeException("Unsupported bulk load type: " + arrayType);
}
/**
* Creates a Java array from a V8Array. The type of the Array must be specified.
* Currently, only INTEGER, DOUBLE, BOOLEAN and STRING are supported.
* The V8Array must only contain elements of type 'arrayType'.
*
* This method will use J2V8's bulk array copy making it faster than iterating over
* all the elements in the array.
*
* @param array The V8Array to convert to a Java Array.
* @param arrayType The type of the V8Array to convert.
*
* @return A Java array representing a V8Array.
*/
public static Object getTypedArray(final V8Array array, final int arrayType) {
int length = array.length();
if (arrayType == V8Value.INTEGER) {
return array.getIntegers(0, length);
} else if (arrayType == V8Value.DOUBLE) {
return array.getDoubles(0, length);
} else if (arrayType == V8Value.BOOLEAN) {
return array.getBooleans(0, length);
} else if (arrayType == V8Value.STRING) {
return array.getStrings(0, length);
}
throw new RuntimeException("Unsupported bulk load type: " + arrayType);
}
/**
* Creates a V8Object from a java.util.Map. This is a deep copy, so if the map
* contains other maps (or lists) they will also be converted.
*
* @param v8 The runtime on which to create the result.
* @param map The map to convert to a V8Object.
*
* @return A V8Object representing the map.
*/
public static V8Object toV8Object(final V8 v8, final Map map) {
Map cache = new Hashtable();
try {
return toV8Object(v8, map, cache).twin();
} finally {
for (V8Value v8Object : cache.values()) {
v8Object.release();
}
}
}
/**
* Creates a V8Array from a java.util.List. This is a deep copy, so if the list
* contains other lists (or maps) they will also be converted.
*
* @param v8 The runtime on which to create the result.
* @param list The list to convert to a V8Array.
*
* @return A V8Array representing the list.
*/
public static V8Array toV8Array(final V8 v8, final List list) {
Map cache = new Hashtable();
try {
return toV8Array(v8, list, cache).twin();
} finally {
for (V8Value v8Object : cache.values()) {
v8Object.release();
}
}
}
/**
* Returns an object usable with a V8 Runtime which represents
* the parameter 'value'. If 'value' is an Integer, Boolean, Double
* or String, then 'value' is simply returned as these are directly
* usable on V8. If 'value' is a map / list, then it's converted to
* a V8Object / V8Array first.
*
* If the result is a V8Value, it must be released.
*
* @param v8 The runtime on which to create V8Values.
* @param value The value to convert to an object usable with V8
*
* @return An object which can be used directly with a V8 runtime.
*/
public static Object getV8Result(final V8 v8, final Object value) {
if (value == null) {
return null;
}
Map cache = new Hashtable();
try {
Object result = getV8Result(v8, value, cache);
if (result instanceof V8Object) {
return ((V8Object) result).twin();
}
return result;
} finally {
for (V8Value v8Object : cache.values()) {
v8Object.release();
}
}
}
/**
* Pushes a Java Object to a V8Array by first converting it to a V8Value if needed.
* If the value is a boxed primitive, then the primitive will be pushed. If the object
* is a Map / List then a deep copy will be performed, converting the object to a
* V8Object / V8Array first.
*
* @param v8 The runtime on which to create any needed V8Values.
* @param array The array to push the elements to.
* @param value The value to push to the array.
*/
public static void pushValue(final V8 v8, final V8Array array, final Object value) {
Map cache = new Hashtable();
try {
pushValue(v8, array, value, cache);
} finally {
for (V8Value v8Object : cache.values()) {
v8Object.release();
}
}
}
/**
* Gets a Java Object representing the value at the given index in the V8Array.
* If the value is a primitive (int, boolean or double) then a boxed instance
* is returned. If the value is a String, then a String is returned. If
* the value is a V8Object or V8Array, then a Map or List is returned.
*
* @param array The array on which to lookup the value. The array is not
* released.
* @param index The index whose element to lookup.
*
* @return A Java Object representing the value at a given index.
*/
public static Object getValue(final V8Array array, final int index) {
V8Map cache = new V8Map();
try {
return getValue(array, index, cache);
} finally {
cache.release();
}
}
/**
* Gets a Java Object representing the value with the given key in the V8Object.
* If the value is a primitive (int, boolean or double) then a boxed instance
* is returned. If the value is a String, then a String is returned. If
* the value is a V8Object or V8Array, then a Map or List is returned.
*
* @param object The object on which to lookup the value. The object is not
* released.
* @param key The key to use to lookup the value.
*
* @return A Java Object representing the value at a given key.
*/
public static Object getValue(final V8Object object, final String key) {
V8Map cache = new V8Map();
try {
return getValue(object, key, cache);
} finally {
cache.release();
}
}
@SuppressWarnings("unchecked")
private static Map toMap(final V8Object object, final V8Map cache) {
if (object == null) {
return Collections.emptyMap();
}
if (cache.containsKey(object)) {
return (Map) cache.get(object);
}
Map result = new V8PropertyMap();
cache.put(object, result);
String[] keys = object.getKeys();
for (String key : keys) {
Object value = getValue(object, key, cache);
if (value != IGNORE) {
result.put(key, value);
}
}
return result;
}
@SuppressWarnings("unchecked")
private static List toList(final V8Array array, final V8Map cache) {
if (array == null) {
return Collections.emptyList();
}
if (cache.containsKey(array)) {
return (List) cache.get(array);
}
List result = new ArrayList();
cache.put(array, result);
for (int i = 0; i < array.length(); i++) {
Object value = getValue(array, i, cache);
if (value != IGNORE) {
result.add(getValue(array, i, cache));
}
}
return result;
}
private static V8Object toV8Object(final V8 v8, final Map map, final Map cache) {
if (cache.containsKey(map)) {
return (V8Object) cache.get(map);
}
V8Object result = new V8Object(v8);
cache.put(map, result);
try {
for (Entry entry : map.entrySet()) {
setValue(v8, result, entry.getKey(), entry.getValue(), cache);
}
} catch (IllegalStateException e) {
result.release();
throw e;
}
return result;
}
private static V8Array toV8Array(final V8 v8, final List list, final Map cache) {
if (cache.containsKey(new ListWrapper(list))) {
return (V8Array) cache.get(new ListWrapper(list));
}
V8Array result = new V8Array(v8);
cache.put(new ListWrapper(list), result);
try {
for (int i = 0; i < list.size(); i++) {
Object value = list.get(i);
pushValue(v8, result, value, cache);
}
} catch (IllegalStateException e) {
result.release();
throw e;
}
return result;
}
private static V8ArrayBuffer toV8ArrayBuffer(final V8 v8, final ArrayBuffer arrayBuffer, final Map cache) {
if (cache.containsKey(arrayBuffer)) {
return (V8ArrayBuffer) cache.get(arrayBuffer);
}
V8ArrayBuffer result = new V8ArrayBuffer(v8, arrayBuffer.getByteBuffer());
cache.put(arrayBuffer, result);
return result;
}
private static V8TypedArray toV8TypedArray(final V8 v8, final TypedArray typedArray, final Map cache) {
if (cache.containsKey(typedArray)) {
return (V8TypedArray) cache.get(typedArray);
}
V8ArrayBuffer arrayBuffer = new V8ArrayBuffer(v8, typedArray.getByteBuffer());
try {
V8TypedArray result = new V8TypedArray(v8, arrayBuffer, typedArray.getType(), 0, typedArray.length());
cache.put(typedArray, result);
return result;
} finally {
arrayBuffer.release();
}
}
@SuppressWarnings("unchecked")
private static Object getV8Result(final V8 v8, final Object value, final Map cache) {
if (cache.containsKey(value)) {
return cache.get(value);
}
if (value instanceof Map) {
return toV8Object(v8, (Map) value, cache);
} else if (value instanceof List) {
return toV8Array(v8, (List) value, cache);
} else if (value instanceof TypedArray) {
return toV8TypedArray(v8, (TypedArray) value, cache);
} else if (value instanceof ArrayBuffer) {
return toV8ArrayBuffer(v8, (ArrayBuffer) value, cache);
}
return value;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static void pushValue(final V8 v8, final V8Array result, final Object value, final Map cache) {
if (value == null) {
result.pushUndefined();
} else if (value instanceof Integer) {
result.push((Integer) value);
} else if (value instanceof Long) {
result.push(new Double((Long) value));
} else if (value instanceof Double) {
result.push((Double) value);
} else if (value instanceof Float) {
result.push((Float) value);
} else if (value instanceof String) {
result.push((String) value);
} else if (value instanceof Boolean) {
result.push((Boolean) value);
} else if (value instanceof V8Object) {
result.push((V8Object) value);
} else if (value instanceof TypedArray) {
V8TypedArray v8TypedArray = toV8TypedArray(v8, (TypedArray) value, cache);
result.push(v8TypedArray);
} else if (value instanceof ArrayBuffer) {
V8ArrayBuffer v8ArrayBuffer = toV8ArrayBuffer(v8, (ArrayBuffer) value, cache);
result.push(v8ArrayBuffer);
} else if (value instanceof Map) {
V8Object object = toV8Object(v8, (Map) value, cache);
result.push(object);
} else if (value instanceof List) {
V8Array array = toV8Array(v8, (List) value, cache);
result.push(array);
} else {
throw new IllegalStateException("Unsupported Object of type: " + value.getClass());
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static void setValue(final V8 v8, final V8Object result, final String key, final Object value, final Map cache) {
if (value == null) {
result.addUndefined(key);
} else if (value instanceof Integer) {
result.add(key, (Integer) value);
} else if (value instanceof Long) {
result.add(key, (int) (long) (Long) value);
} else if (value instanceof Double) {
result.add(key, (Double) value);
} else if (value instanceof Float) {
result.add(key, (Float) value);
} else if (value instanceof String) {
result.add(key, (String) value);
} else if (value instanceof Boolean) {
result.add(key, (Boolean) value);
} else if (value instanceof V8Object) {
result.add(key, (V8Object) value);
} else if (value instanceof TypedArray) {
V8TypedArray typedArray = toV8TypedArray(v8, (TypedArray) value, cache);
result.add(key, typedArray);
} else if (value instanceof ArrayBuffer) {
V8ArrayBuffer v8ArrayBuffer = toV8ArrayBuffer(v8, (ArrayBuffer) value, cache);
result.add(key, v8ArrayBuffer);
} else if (value instanceof Map) {
V8Object object = toV8Object(v8, (Map) value, cache);
result.add(key, object);
} else if (value instanceof List) {
V8Array array = toV8Array(v8, (List) value, cache);
result.add(key, array);
} else {
throw new IllegalStateException("Unsupported Object of type: " + value.getClass());
}
}
private static Object getValue(final V8Array array, final int index, final V8Map cache) {
int valueType = array.getType(index);
switch (valueType) {
case V8Value.INTEGER:
return array.getInteger(index);
case V8Value.DOUBLE:
return array.getDouble(index);
case V8Value.BOOLEAN:
return array.getBoolean(index);
case V8Value.STRING:
return array.getString(index);
case V8Value.V8_FUNCTION:
return IGNORE;
case V8Value.V8_ARRAY_BUFFER:
V8ArrayBuffer buffer = (V8ArrayBuffer) array.get(index);
try {
return new ArrayBuffer(buffer.getBackingStore());
} finally {
buffer.release();
}
case V8Value.V8_TYPED_ARRAY:
V8Array typedArray = array.getArray(index);
try {
return toTypedArray(typedArray);
} finally {
if (typedArray instanceof V8Array) {
typedArray.release();
}
}
case V8Value.V8_ARRAY:
V8Array arrayValue = array.getArray(index);
try {
return toList(arrayValue, cache);
} finally {
if (arrayValue instanceof V8Array) {
arrayValue.release();
}
}
case V8Value.V8_OBJECT:
V8Object objectValue = array.getObject(index);
try {
return toMap(objectValue, cache);
} finally {
if (objectValue instanceof V8Object) {
objectValue.release();
}
}
case V8Value.NULL:
return null;
case V8Value.UNDEFINED:
return V8.getUndefined();
default:
throw new IllegalStateException("Cannot find type for index: " + index);
}
}
private static Object toTypedArray(final V8Array typedArray) {
int arrayType = typedArray.getType();
ByteBuffer buffer = ((V8TypedArray) typedArray).getByteBuffer();
switch (arrayType) {
case V8Value.INT_8_ARRAY:
return new Int8Array(buffer);
case V8Value.UNSIGNED_INT_8_ARRAY:
return new UInt8Array(buffer);
case V8Value.UNSIGNED_INT_8_CLAMPED_ARRAY:
return new UInt8ClampedArray(buffer);
case V8Value.INT_16_ARRAY:
return new Int16Array(buffer);
case V8Value.UNSIGNED_INT_16_ARRAY:
return new UInt16Array(buffer);
case V8Value.INT_32_ARRAY:
return new Int32Array(buffer);
case V8Value.UNSIGNED_INT_32_ARRAY:
return new UInt32Array(buffer);
case V8Value.FLOAT_32_ARRAY:
return new Float32Array(buffer);
case V8Value.FLOAT_64_ARRAY:
return new Float64Array(buffer);
default:
throw new IllegalStateException("Known Typed Array type: " + V8Value.getStringRepresentaion(arrayType));
}
}
private static Object getValue(final V8Object object, final String key, final V8Map cache) {
int valueType = object.getType(key);
switch (valueType) {
case V8Value.INTEGER:
return object.getInteger(key);
case V8Value.DOUBLE:
return object.getDouble(key);
case V8Value.BOOLEAN:
return object.getBoolean(key);
case V8Value.STRING:
return object.getString(key);
case V8Value.V8_FUNCTION:
return IGNORE;
case V8Value.V8_ARRAY_BUFFER:
V8ArrayBuffer buffer = (V8ArrayBuffer) object.get(key);
try {
return new ArrayBuffer(buffer.getBackingStore());
} finally {
buffer.release();
}
case V8Value.V8_TYPED_ARRAY:
V8Array typedArray = object.getArray(key);
try {
return toTypedArray(typedArray);
} finally {
if (typedArray instanceof V8Array) {
typedArray.release();
}
}
case V8Value.V8_ARRAY:
V8Array array = object.getArray(key);
try {
return toList(array, cache);
} finally {
if (array instanceof V8Array) {
array.release();
}
}
case V8Value.V8_OBJECT:
V8Object child = object.getObject(key);
try {
return toMap(child, cache);
} finally {
if (child instanceof V8Object) {
child.release();
}
}
case V8Value.NULL:
return null;
case V8Value.UNDEFINED:
return V8.getUndefined();
default:
throw new IllegalStateException("Cannot find type for key: " + key);
}
}
private V8ObjectUtils() {
}
static class ListWrapper {
private List list;
public ListWrapper(final List list) {
this.list = list;
}
@Override
public boolean equals(final Object obj) {
if (obj instanceof ListWrapper) {
return ((ListWrapper) obj).list == list;
}
return false;
}
@Override
public int hashCode() {
return System.identityHashCode(list);
}
}
}
