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Javet is Java + V8 (JAVa + V + EighT). It is an awesome way of embedding Node.js and V8 in Java.
The newest version!
/*
* Copyright (c) 2021-2024. caoccao.com Sam Cao
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.caoccao.javet.utils;
import com.caoccao.javet.annotations.CheckReturnValue;
import com.caoccao.javet.enums.V8ValueErrorType;
import com.caoccao.javet.exceptions.JavetException;
import com.caoccao.javet.exceptions.V8ErrorTemplate;
import com.caoccao.javet.interop.V8Runtime;
import com.caoccao.javet.interop.V8Scope;
import com.caoccao.javet.values.V8Value;
import com.caoccao.javet.values.primitive.V8ValueUndefined;
import com.caoccao.javet.values.reference.*;
import java.util.Map;
import java.util.StringJoiner;
/**
* The type V8 value utils.
*
* @since 0.7.1
*/
public final class V8ValueUtils {
private V8ValueUtils() {
}
/**
* Call asInt() by V8 value array and index.
*
* @param v8Values the V8 values
* @param index the index
* @return the int value
* @throws JavetException the javet exception
* @since 3.0.4
*/
public static int asInt(V8Value[] v8Values, int index) throws JavetException {
return asInt(v8Values, index, 0);
}
/**
* Call asInt() by V8 value array and index.
*
* @param v8Values the V8 values
* @param index the index
* @param defaultValue the default value
* @return the int value
* @throws JavetException the javet exception
* @since 3.0.4
*/
public static int asInt(V8Value[] v8Values, int index, int defaultValue) throws JavetException {
if (v8Values != null && index >= 0 && index < v8Values.length && v8Values[index] != null) {
return v8Values[index].asInt();
}
return defaultValue;
}
/**
* Call toString() by V8 value array and index.
*
* @param v8Values the V8 values
* @param index the index
* @return the string
* @since 3.0.4
*/
public static String asString(V8Value[] v8Values, int index) {
return asString(v8Values, index, V8ValueUndefined.UNDEFINED);
}
/**
* Call toString() by V8 value array and index.
*
* @param v8Values the V8 values
* @param index the index
* @param defaultValue the default value
* @return the string
* @since 3.0.4
*/
public static String asString(V8Value[] v8Values, int index, String defaultValue) {
if (v8Values != null && index >= 0 && index < v8Values.length && v8Values[index] != null) {
return v8Values[index].toString();
}
return defaultValue;
}
/**
* Call toString() by V8 value.
*
* @param v8Value the V8 value
* @return the string
* @since 3.0.4
*/
public static String asString(V8Value v8Value) {
return asString(v8Value, V8ValueUndefined.UNDEFINED);
}
/**
* Call toString() by V8 value.
*
* @param v8Value the V8 value
* @param defaultValue the default value
* @return the string
* @since 3.0.4
*/
public static String asString(V8Value v8Value, String defaultValue) {
return v8Value == null ? defaultValue : v8Value.toString();
}
/**
* As V8Value by V8 value array and index.
*
* @param v8Values the V8 values
* @param index the index
* @return the V8 value
* @since 3.0.4
*/
@CheckReturnValue
public static V8Value asV8Value(V8Value[] v8Values, int index) {
if (v8Values != null && index >= 0 && index < v8Values.length) {
return v8Values[index];
}
return null;
}
/**
* Get V8ValueFunction by V8 value array and index.
*
* @param v8Values the V8 values
* @param index the index
* @return the V8 value function
* @since 3.0.4
*/
@CheckReturnValue
public static V8ValueFunction asV8ValueFunction(V8Value[] v8Values, int index) {
if (ArrayUtils.isNotEmpty(v8Values) && index >= 0 && index < v8Values.length) {
V8Value v8Value = v8Values[index];
if (v8Value instanceof V8ValueFunction) {
return (V8ValueFunction) v8Value;
}
}
return null;
}
/**
* Get V8ValueFunction by V8 value array and index.
* If the V8ValueFunction is invalid, throw a TypeError.
*
* @param v8Runtime the V8 runtime
* @param v8Values the V8 values
* @param index the index
* @return the V8 value function
* @since 3.0.4
*/
@CheckReturnValue
public static V8ValueFunction asV8ValueFunctionWithError(V8Runtime v8Runtime, V8Value[] v8Values, int index) {
V8Value v8Value = null;
if (ArrayUtils.isNotEmpty(v8Values) && index >= 0 && index < v8Values.length) {
v8Value = v8Values[index];
if (v8Value instanceof V8ValueFunction) {
return (V8ValueFunction) v8Value;
}
}
v8Runtime.throwError(V8ValueErrorType.TypeError, V8ErrorTemplate.typeErrorValueIsNotAFunction(v8Value));
return null;
}
/**
* As V8ValueObject by V8 value array and index.
*
* @param v8Values the V8 values
* @param index the index
* @return the V8 value object
* @since 3.0.4
*/
@CheckReturnValue
public static V8ValueObject asV8ValueObject(V8Value[] v8Values, int index) {
if (v8Values != null && index >= 0 && index < v8Values.length
&& v8Values[index] instanceof V8ValueObject) {
return (V8ValueObject) v8Values[index];
}
return null;
}
/**
* Concat string.
*
* @param delimiter the delimiter
* @param v8Values the V8 values
* @return the string
* @since 0.7.1
*/
public static String concat(String delimiter, V8Value... v8Values) {
if (ArrayUtils.isEmpty(v8Values)) {
return StringUtils.EMPTY;
}
if (delimiter == null) {
delimiter = StringUtils.EMPTY;
}
StringJoiner stringJoiner = new StringJoiner(delimiter);
for (V8Value v8Value : v8Values) {
stringJoiner.add(asString(v8Value));
}
return stringJoiner.toString();
}
/**
* Convert to virtual objects.
*
* @param v8Values the V8 values
* @return the javet virtual objects
* @since 0.9.10
*/
public static JavetVirtualObject[] convertToVirtualObjects(V8Value... v8Values) {
final int length = v8Values == null ? 0 : v8Values.length;
JavetVirtualObject[] javetVirtualObjects = new JavetVirtualObject[length];
for (int i = 0; i < length; ++i) {
javetVirtualObjects[i] = new JavetVirtualObject(v8Values[i]);
}
return javetVirtualObjects;
}
/**
* Create V8 value array from object array.
*
* @param v8Runtime the V8 runtime
* @param objects the objects
* @return the V8 value array
* @throws JavetException the javet exception
* @since 3.0.4
*/
@CheckReturnValue
public static V8ValueArray createV8ValueArray(V8Runtime v8Runtime, Object... objects) throws JavetException {
try (V8Scope v8Scope = v8Runtime.getV8Scope()) {
V8ValueArray v8ValueArray = v8Scope.createV8ValueArray();
if (ArrayUtils.isNotEmpty(objects)) {
v8ValueArray.push(objects);
}
v8Scope.setEscapable();
return v8ValueArray;
}
}
/**
* Create V8 value map from map.
*
* @param v8Runtime the V8 runtime
* @param map the map
* @return the V8 value map
* @throws JavetException the javet exception
* @since 3.0.4
*/
@CheckReturnValue
public static V8ValueMap createV8ValueMap(V8Runtime v8Runtime, Map map) throws JavetException {
try (V8Scope v8Scope = v8Runtime.getV8Scope()) {
V8ValueMap v8ValueMap = v8Scope.createV8ValueMap();
if (map != null && !map.isEmpty()) {
Object[] keyAndValuePairs = new Object[map.size() << 1];
int index = 0;
for (Map.Entry entry : map.entrySet()) {
keyAndValuePairs[index++] = entry.getKey();
keyAndValuePairs[index++] = entry.getValue();
}
v8ValueMap.set(keyAndValuePairs);
}
v8Scope.setEscapable();
return v8ValueMap;
}
}
/**
* Create V8 value object from object array.
*
* @param v8Runtime the V8 runtime
* @param objects the objects
* @return the V8 value object
* @throws JavetException the javet exception
* @since 3.0.4
*/
@CheckReturnValue
public static V8ValueObject createV8ValueObject(V8Runtime v8Runtime, Object... objects) throws JavetException {
try (V8Scope v8Scope = v8Runtime.getV8Scope()) {
V8ValueObject v8ValueObject = v8Scope.createV8ValueObject();
if (ArrayUtils.isNotEmpty(objects)) {
v8ValueObject.set(objects);
}
v8Scope.setEscapable();
return v8ValueObject;
}
}
/**
* Create V8 value set from object array.
*
* @param v8Runtime the V8 runtime
* @param objects the objects
* @return the V8 value set
* @throws JavetException the javet exception
* @since 3.0.4
*/
@CheckReturnValue
public static V8ValueSet createV8ValueSet(V8Runtime v8Runtime, Object... objects) throws JavetException {
try (V8Scope v8Scope = v8Runtime.getV8Scope()) {
V8ValueSet v8ValueSet = v8Scope.createV8ValueSet();
if (ArrayUtils.isNotEmpty(objects)) {
for (Object object : objects) {
v8ValueSet.add(object);
}
}
v8Scope.setEscapable();
return v8ValueSet;
}
}
/**
* Convert V8 values to objects.
*
* @param v8Runtime the V8 runtime
* @param v8Values the V8 values
* @return the array
* @throws JavetException the javet exception
* @since 3.0.3
*/
public static Object[] toArray(V8Runtime v8Runtime, V8Value... v8Values) throws JavetException {
final int length = v8Values == null ? 0 : v8Values.length;
Object[] objects = new Object[length];
for (int i = 0; i < length; ++i) {
objects[i] = v8Runtime.toObject(v8Values[i]);
}
return objects;
}
/**
* Trim anonymous function source code.
*
* @param sourceCode the source code
* @return the trimmed source code
* @since 1.0.0
*/
public static String trimAnonymousFunction(String sourceCode) {
if (sourceCode != null) {
final int length = sourceCode.length();
if (length > 0) {
int endPosition = length;
boolean completed = false;
while (!completed && endPosition > 0) {
switch (sourceCode.charAt(endPosition - 1)) {
case ' ':
case '\n':
case '\r':
case '\t':
case ';':
endPosition--;
break;
default:
completed = true;
break;
}
}
if (endPosition == length) {
return sourceCode;
} else {
return sourceCode.substring(0, endPosition);
}
}
}
return null;
}
}