org.neo4j.procedure.impl.ProcedureCompilation Maven / Gradle / Ivy
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/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [https://neo4j.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see VOID_ITERATOR =
new ResourceRawIterator<>() {
@Override
public boolean hasNext() {
return false;
}
@Override
public AnyValue[] next() {
return EMPTY_ARRAY;
}
@Override
public void close() {}
};
private static final boolean DEBUG = false;
private static final String LONG = long.class.getCanonicalName();
private static final String BOXED_LONG = Long.class.getCanonicalName();
private static final String DOUBLE = double.class.getCanonicalName();
private static final String BOXED_DOUBLE = Double.class.getCanonicalName();
private static final String BOOLEAN = boolean.class.getCanonicalName();
private static final String BOXED_BOOLEAN = Boolean.class.getCanonicalName();
private static final String NUMBER = Number.class.getCanonicalName();
private static final String STRING = String.class.getCanonicalName();
private static final String NODE = Node.class.getCanonicalName();
private static final String RELATIONSHIP = Relationship.class.getCanonicalName();
private static final String PATH = Path.class.getCanonicalName();
private static final String POINT = org.neo4j.graphdb.spatial.Point.class.getCanonicalName();
private static final String LIST = List.class.getCanonicalName();
private static final String MAP = Map.class.getCanonicalName();
private static final String BYTE_ARRAY = byte[].class.getCanonicalName();
private static final String ZONED_DATE_TIME = ZonedDateTime.class.getCanonicalName();
private static final String LOCAL_DATE_TIME = LocalDateTime.class.getCanonicalName();
private static final String LOCAL_DATE = LocalDate.class.getCanonicalName();
private static final String OFFSET_TIME = OffsetTime.class.getCanonicalName();
private static final String LOCAL_TIME = LocalTime.class.getCanonicalName();
private static final String TEMPORAL_AMOUNT = TemporalAmount.class.getCanonicalName();
private static final String PACKAGE = "org.neo4j.kernel.impl.proc";
private static final String SIGNATURE_NAME = "SIGNATURE";
private static final String USER_CLASS = "userClass";
private static final String VALUE_MAPPER_NAME = "MAPPER";
private static final AnyValue[] EMPTY_ARRAY = new AnyValue[0];
private static final MethodDeclaration.Builder USER_FUNCTION = method(
AnyValue.class, "apply", param(Context.class, "ctx"), param(AnyValue[].class, "input"))
.throwsException(typeReference(ProcedureException.class));
private static final MethodDeclaration.Builder USER_PROCEDURE = method(
parameterizedType(
ResourceRawIterator.class,
typeReference(AnyValue[].class),
typeReference(ProcedureException.class)),
"apply",
param(Context.class, "ctx"),
param(AnyValue[].class, "input"),
param(ResourceMonitor.class, "monitor"))
.throwsException(typeReference(ProcedureException.class));
private static final MethodDeclaration.Builder AGGREGATION_CREATE = method(
UserAggregator.class, "create", param(Context.class, "ctx"))
.throwsException(typeReference(ProcedureException.class));
private static final MethodDeclaration.Builder AGGREGATION_UPDATE = method(
void.class, "update", param(AnyValue[].class, "input"))
.throwsException(typeReference(ProcedureException.class));
private static final MethodDeclaration.Builder AGGREGATION_RESULT =
method(AnyValue.class, "result").throwsException(typeReference(ProcedureException.class));
private ProcedureCompilation() {
throw new UnsupportedOperationException("Do not instantiate");
}
/**
* Generates code for a user-defined function.
*
* Given a user-defined function defined by
*
*
* class MyClass {
* {@literal @}Context
* public Log log;
*
* {@literal @}UserFunction
* public double addPi(long value) {
* return value + Math.PI;
* }
* }
*
*
* we will generate something like
*
*
* class GeneratedAddPi implements CallableUserFunction {
* public static UserFunctionSignature SIGNATURE;
* public static FieldSetter SETTER_0;
*
* public AnyValue apply(Context ctx, AnyValue[] input) {
* try {
* MyClass userClass = new MyClass();
* userClass.log = (Log) SETTER_0.get(ctx);
* return Values.doubleValue(userClass.addPi( ((NumberValue) input[0]).longValue() );
* } catch (Throwable T) {
* throw new ProcedureException([appropriate error msg], T);
* }
* }
*
* public UserFunctionSignature signature() {return SIGNATURE;}
* }
*
*
* where the static fields are set once during loading via reflection.
*
* @param signature the signature of the user-defined function
* @param fieldSetters the fields to set before each call.
* @param methodToCall the method to call
* @param parentClassLoader the classloader to resolve with.
* @return a CallableUserFunction delegating to the underlying user-defined function.
* @throws ProcedureException if something went wrong when compiling the user-defined function.
*/
static CallableUserFunction compileFunction(
UserFunctionSignature signature,
List fieldSetters,
Method methodToCall,
ClassLoader parentClassLoader)
throws ProcedureException {
ClassHandle handle;
try {
CodeGenerator codeGenerator = codeGenerator(parentClassLoader);
try (ClassGenerator generator =
codeGenerator.generateClass(PACKAGE, className(signature), CallableUserFunction.class)) {
// static fields
FieldReference signatureField =
generator.publicStaticField(typeReference(UserFunctionSignature.class), SIGNATURE_NAME);
List fieldsToSet = createContextSetters(fieldSetters, generator);
// CallableUserFunction::apply
try (CodeBlock method = generator.generate(USER_FUNCTION)) {
try (var body = method.tryCatch(
onError -> onError(onError, format("function `%s`", signature.name())),
param(Throwable.class, "T"))) {
functionBody(body, fieldSetters, fieldsToSet, methodToCall);
}
}
// CallableUserFunction::signature
try (CodeBlock method = generator.generateMethod(UserFunctionSignature.class, "signature")) {
method.returns(getStatic(signatureField));
}
handle = generator.handle();
}
Class clazz = handle.loadClass();
// set all static fields
setAllStaticFields(signature, fieldSetters, clazz);
return (CallableUserFunction) clazz.getConstructor().newInstance();
} catch (Throwable e) {
throw ProcedureException.compilationFailed(
"function", methodToCall.getDeclaringClass().getSimpleName(), e);
}
}
/**
* Generates code for a user-defined procedure.
*
* Given a user-defined function defined by
*
*
* class MyClass {
* {@literal @}Context
* public Log log;
*
* {@literal @}Procedure
* public Stream myStream(long value) {
* ...
* }
* }
*
*
* we will generate something like
*
*
* class GeneratedMyStream implements CallableProcedure {
* public static ProcedureSignature SIGNATURE;
* public static FieldSetter SETTER_0;
*
* RawIterator apply( Context ctx, AnyValue[] in, ResourceMonitor monitor ) throws ProcedureException {
* try {
* MyClass userClass = new MyClass();
* userClass.log = (Log) SETTER_0.get(ctx);
* Stream fromUser = userClass.myStream(((NumberValue) input[0]).longValue() );
* return new GeneratedIterator(fromUser, tracker, SIGNATURE);
* } catch (Throwable T) {
* throw new ProcedureException([appropriate error msg], T);
* }
* }
*
* public ProcedureSignature signature() {return SIGNATURE;}
* }
*
*
* where the static fields are set once during loading via reflection and where the GeneratedIterator
* implements the appropriate mapping from user-types Object[] to AnyValue[].
*
* @param signature the signature of the procedure
* @param fieldSetters the fields to set before each call.
* @param methodToCall the method to call
* @param parentClassLoader the classloader to resolve with.
* @return a CallableProcedure delegating to the underlying procedure method.
* @throws ProcedureException if something went wrong when compiling the user-defined function.
*/
static CallableProcedure compileProcedure(
ProcedureSignature signature,
List fieldSetters,
Method methodToCall,
ClassLoader parentClassLoader)
throws ProcedureException {
ClassHandle handle;
try {
CodeGenerator codeGenerator = codeGenerator(parentClassLoader);
Class iterator = generateIterator(codeGenerator, procedureType(methodToCall));
try (ClassGenerator generator =
codeGenerator.generateClass(PACKAGE, className(signature), CallableProcedure.class)) {
// static fields
FieldReference signatureField =
generator.publicStaticField(typeReference(ProcedureSignature.class), SIGNATURE_NAME);
List fieldsToSet = createContextSetters(fieldSetters, generator);
// CallableProcedure::apply
try (CodeBlock method = generator.generate(USER_PROCEDURE)) {
try (var body = method.tryCatch(
onError -> onError(onError, format("procedure `%s`", signature.name())),
param(Throwable.class, "T"))) {
procedureBody(body, fieldSetters, fieldsToSet, signatureField, methodToCall, iterator);
}
}
// CallableUserFunction::signature
try (CodeBlock method = generator.generateMethod(ProcedureSignature.class, "signature")) {
method.returns(getStatic(signatureField));
}
handle = generator.handle();
}
Class clazz = handle.loadClass();
// set all static fields
setAllStaticFields(signature, fieldSetters, clazz);
return (CallableProcedure) clazz.getConstructor().newInstance();
} catch (Throwable e) {
throw ProcedureException.compilationFailed(
"procedure", methodToCall.getDeclaringClass().getSimpleName(), e);
}
}
/**
* Generates code for a user-defined aggregation function.
*
* Given a user-defined aggregation function defined by
*
*
* class MyClass {
* {@literal @}Context
* public Log log;
*
* {@literal @}UserAggregationFunction
* public Adder create() {
* return new Adder;
* }
* }
*
* class Adder {
* private long sum;
* {@literal @}UserAggregationUpdate
* public void update(long in) {
* sum += in;
* }
* {@literal @}UserAggregationResult
* public long result() {
* return sum;
* }
* }
* }
*
*
* we will generate two classe looking something like
*
*
* class Generated implements CallableUserAggregationFunction {
* public static UserFunctionSignature SIGNATURE;
* public static FieldSetter SETTER_0;
*
* public UserAggregator create(Context ctx) {
* try {
* MyClass userClass = new MyClass();
* userClass.log = (Log) SETTER_0.get(ctx);
* return new GeneratedAdder(userClass.create());
* } catch (Throwable T) {
* throw new ProcedureException([appropriate error msg], T);
* }
* }
*
* public UserFunctionSignature signature() {return SIGNATURE;}
* }
* class GeneratedAdder implements UserAggregator {
* private Adder adder;
*
* GeneratedAdder(Adder adder) {
* this.adder = adder;
* }
*
* void update(AnyValue[] in) {
* adder.update(((NumberValue) in).longValue());
* }
*
* AnyValue result() {
* return adder.result(Values.longValue(adder.result());
* }
* }
*
*
* where the static fields are set once during loading via reflection.
*
* @param signature the signature of the user-defined function
* @param fieldSetters the fields to set before each call.
* @param create the method that creates the aggregator
* @param update the update method of the aggregator
* @param result the result method of the aggregator
* @param parentClassLoader the classloader to resolve with.
* @return a CallableUserFunction delegating to the underlying user-defined function.
* @throws ProcedureException if something went wrong when compiling the user-defined function.
*/
static CallableUserAggregationFunction compileAggregation(
UserFunctionSignature signature,
List fieldSetters,
Method create,
Method update,
Method result,
ClassLoader parentClassLoader)
throws ProcedureException {
ClassHandle handle;
try {
CodeGenerator codeGenerator = codeGenerator(parentClassLoader);
Class aggregator = generateAggregator(codeGenerator, update, result, signature);
try (ClassGenerator generator = codeGenerator.generateClass(
CallableUserAggregationFunction.BasicUserAggregationFunction.class,
PACKAGE,
className(signature),
CallableUserAggregationFunction.class)) {
// static fields
List fieldsToSet = createContextSetters(fieldSetters, generator);
// constructor
try (CodeBlock constructor =
generator.generateConstructor(param(UserFunctionSignature.class, "signature"))) {
constructor.expression(invokeSuper(
typeReference(CallableUserAggregationFunction.BasicUserAggregationFunction.class),
constructor.load("signature")));
}
// CallableUserAggregationFunction::create
try (CodeBlock method = generator.generate(AGGREGATION_CREATE)) {
try (var body = method.tryCatch(
onError -> onError(onError, format("function `%s`", signature.name())),
param(Throwable.class, "T"))) {
createAggregationBody(body, fieldSetters, fieldsToSet, create, aggregator);
}
}
handle = generator.handle();
}
Class clazz = handle.loadClass();
// set all static fields
setAllStaticFields(fieldSetters, clazz);
return (CallableUserAggregationFunction)
clazz.getConstructor(UserFunctionSignature.class).newInstance(signature);
} catch (Throwable e) {
throw ProcedureException.compilationFailed(
"function", create.getDeclaringClass().getSimpleName(), e);
}
}
/**
* Used by generated code. Needs to be public.
* @param throwable The thrown exception
* @param typeAndName the type and name of the caller, e.g "function `my.udf`"
* @return an exception with an appropriate message.
*/
public static ProcedureException rethrowProcedureException(Throwable throwable, String typeAndName) {
if (throwable instanceof ProcedureException) {
return (ProcedureException) throwable;
}
if (throwable instanceof Status.HasStatus) {
return new ProcedureException(
((Status.HasStatus) throwable).status(), throwable, throwable.getMessage(), throwable);
} else {
return ProcedureException.invocationFailed(typeAndName, throwable);
}
}
/**
* Byte arrays needs special treatment since it is not a proper Cypher type
* @param input either a ByteArray or ListValue of bytes
* @return input value converted to a byte[]
*/
public static byte[] toByteArray(AnyValue input) {
if (input instanceof ByteArray) {
return ((ByteArray) input).asObjectCopy();
}
if (input instanceof SequenceValue list) {
if (list.iterationPreference() == RANDOM_ACCESS) {
byte[] bytes = new byte[list.intSize()];
for (int a = 0; a < bytes.length; a++) {
bytes[a] = asByte(list.value(a));
}
return bytes;
} else {
// list.length may have linear complexity, still worth doing it upfront
byte[] bytes = new byte[list.intSize()];
int i = 0;
for (AnyValue anyValue : list) {
bytes[i++] = asByte(anyValue);
}
return bytes;
}
} else {
throw new IllegalArgumentException(
"Cannot convert " + input.getClass().getSimpleName() + " to byte[] for input to procedure");
}
}
/**
* Generates a tailored iterator mapping from the user-stream to the internal RawIterator
*
* The generated iterator extends {@link BaseStreamIterator} and generates a tailored
* {@link BaseStreamIterator#map(Object)} method based on the signature of the user procedure.
*
* @param codeGenerator the current generator
* @param outputType the output type of the user procedure
* @return a tailored iterator with appropriate code mappings
*/
private static Class generateIterator(CodeGenerator codeGenerator, Class outputType) {
if (outputType.equals(void.class)) {
return VOID_ITERATOR.getClass();
}
ClassHandle handle;
try (ClassGenerator generator =
codeGenerator.generateClass(BaseStreamIterator.class, PACKAGE, iteratorName(outputType))) {
FieldReference context = generator.field(Context.class, "ctx");
try (CodeBlock constructor = generator.generateConstructor(
param(Stream.class, "stream"),
param(ResourceMonitor.class, "monitor"),
param(ProcedureSignature.class, "signature"),
param(Context.class, "ctx"))) {
constructor.expression(invokeSuper(
typeReference(BaseStreamIterator.class),
constructor.load("stream"),
constructor.load("monitor"),
constructor.load("signature")));
constructor.put(constructor.self(), context, constructor.load("ctx"));
}
try (CodeBlock method = generator.generate(method(AnyValue[].class, "map", param(Object.class, "in")))) {
method.assign(outputType, "casted", cast(outputType, method.load("in")));
// we know all fields are properly typed
List fields = ProcedureOutputSignatureCompiler.instanceFields(outputType);
Expression[] mapped = new Expression[fields.size()];
for (int i = 0; i < fields.size(); i++) {
Field f = fields.get(i);
if (outputType.isRecord()) {
// Records must be accessed through the public method with the same name as the field
mapped[i] = toAnyValue(
invoke(method.load("casted"), methodReference(outputType, f.getType(), f.getName())),
f.getType(),
get(method.self(), context));
} else {
mapped[i] = toAnyValue(
get(method.load("casted"), field(f)), f.getType(), get(method.self(), context));
}
}
method.returns(Expression.newInitializedArray(typeReference(AnyValue.class), mapped));
}
handle = generator.handle();
}
try {
return handle.loadClass();
} catch (
CompilationFailureException
e) { // We are being called from a lambda so it'll have to do with runtime exceptions here
throw new RuntimeException("Failed to generate iterator", e);
}
}
private static Class generateAggregator(
CodeGenerator codeGenerator, Method update, Method result, UserFunctionSignature signature) {
assert update.getDeclaringClass().equals(result.getDeclaringClass());
Class userAggregatorClass = update.getDeclaringClass();
ClassHandle handle;
try (ClassGenerator generator = codeGenerator.generateClass(
PACKAGE,
"Aggregator" + userAggregatorClass.getSimpleName() + System.nanoTime(),
UserAggregator.class)) {
FieldReference aggregator = generator.field(userAggregatorClass, "aggregator");
FieldReference context = generator.field(Context.class, "ctx");
// constructor
try (CodeBlock constructor = generator.generateConstructor(
param(userAggregatorClass, "aggregator"), param(Context.class, "ctx"))) {
constructor.expression(invokeSuper(OBJECT));
constructor.put(constructor.self(), aggregator, constructor.load("aggregator"));
constructor.put(constructor.self(), context, constructor.load("ctx"));
}
// update
try (CodeBlock block = generator.generate(AGGREGATION_UPDATE)) {
try (var body = block.tryCatch(
onError -> onError(onError, format("function `%s`", signature.name())),
param(Throwable.class, "T"))) {
body.expression(invoke(
get(body.self(), aggregator),
methodReference(update),
parameters(body, update, get(body.self(), context))));
}
}
// result
try (CodeBlock block = generator.generate(AGGREGATION_RESULT)) {
try (var body = block.tryCatch(
onError -> onError(onError, format("function `%s`", signature.name())),
param(Throwable.class, "T"))) {
body.returns(toAnyValue(
body,
"result",
invoke(get(body.self(), aggregator), methodReference(result)),
result.getReturnType(),
get(body.self(), context)));
}
}
handle = generator.handle();
}
try {
return handle.loadClass();
} catch (
CompilationFailureException
e) { // We are being called from a lambda so it'll have to do with runtime exceptions here
throw new RuntimeException("Failed to generate iterator", e);
}
}
private static String className(UserFunctionSignature signature) {
return format("GeneratedFunction_%s%d", signature.name().name(), System.nanoTime());
}
private static String className(ProcedureSignature signature) {
return format("GeneratedProcedure_%s%d", signature.name().name(), System.nanoTime());
}
private static String iteratorName(Class out) {
return format("Iterator_%s%d", out.getSimpleName(), System.nanoTime());
}
/**
* Generates the actual body of the function. Generated the code will look something like:
*
* userClass.field1 = (type1) SETTER_1.get(context)
* userClass.field2 = (type2) SETTER_2.get(context)
* ...
* return [CONVERT TO AnyVALUE](userClass.call( [CONVERT_TO_JAVA] input[0], ... );
*/
private static void functionBody(
CodeBlock block, List fieldSetters, List fieldsToSet, Method methodToCall) {
// generate: `UserClass userClass = new UserClass();
block.assign(
typeReference(methodToCall.getDeclaringClass()),
USER_CLASS,
invoke(
newInstance(methodToCall.getDeclaringClass()),
constructorReference(methodToCall.getDeclaringClass())));
// inject fields in user class
injectFields(block, fieldSetters, fieldsToSet);
// get parameters to the user-method to call
Expression[] parameters = parameters(block, methodToCall, block.load("ctx"));
// call the actual function
block.assign(
methodToCall.getReturnType(),
"fromFunction",
invoke(block.load(USER_CLASS), methodReference(methodToCall), parameters));
block.returns(toAnyValue(block.load("fromFunction"), methodToCall.getReturnType(), block.load("ctx")));
}
private static void procedureBody(
CodeBlock block,
List fieldSetters,
List fieldsToSet,
FieldReference signature,
Method methodToCall,
Class iterator) {
// generate: `UserClass userClass = new UserClass();
block.assign(
typeReference(methodToCall.getDeclaringClass()),
USER_CLASS,
invoke(
newInstance(methodToCall.getDeclaringClass()),
constructorReference(methodToCall.getDeclaringClass())));
injectFields(block, fieldSetters, fieldsToSet);
Expression[] parameters = parameters(block, methodToCall, block.load("ctx"));
if (iterator.equals(
VOID_ITERATOR.getClass())) { // if we are calling a void method we just need to call and return empty
block.expression(invoke(block.load(USER_CLASS), methodReference(methodToCall), parameters));
block.returns(getStatic(FieldReference.field(
typeReference(ProcedureCompilation.class),
typeReference(ResourceRawIterator.class),
"VOID_ITERATOR")));
} else { // here we must both call and map stream to an iterator
block.assign(
parameterizedType(Stream.class, procedureType(methodToCall)),
"fromProcedure",
invoke(block.load(USER_CLASS), methodReference(methodToCall), parameters));
block.returns(invoke(
newInstance(iterator),
constructorReference(
iterator, Stream.class, ResourceMonitor.class, ProcedureSignature.class, Context.class),
block.load("fromProcedure"),
block.load("monitor"),
getStatic(signature),
block.load("ctx")));
}
}
private static Class procedureType(Method method) {
// return type is always Stream<> or void
if (method.getReturnType().equals(void.class)) {
return void.class;
} else {
ParameterizedType returnType = (ParameterizedType) method.getGenericReturnType();
return (Class) returnType.getActualTypeArguments()[0];
}
}
private static void createAggregationBody(
CodeBlock block,
List fieldSetters,
List fieldsToSet,
Method createMethod,
Class aggregator) {
// generate: `UserClass userClass = new UserClass();
block.assign(
typeReference(createMethod.getDeclaringClass()),
USER_CLASS,
invoke(
newInstance(createMethod.getDeclaringClass()),
constructorReference(createMethod.getDeclaringClass())));
// inject fields in user class
injectFields(block, fieldSetters, fieldsToSet);
// call the actual function
block.assign(
createMethod.getReturnType(),
"fromUser",
invoke(block.load(USER_CLASS), methodReference(createMethod)));
block.returns(invoke(
newInstance(aggregator),
constructorReference(aggregator, createMethod.getReturnType(), Context.class),
block.load("fromUser"),
block.load("ctx")));
}
/**
* Handle errors by redirecting to {@link #rethrowProcedureException(Throwable, String)} }
*/
private static void onError(CodeBlock block, String typeAndName) {
block.throwException(invoke(
methodReference(
ProcedureCompilation.class,
ProcedureException.class,
"rethrowProcedureException",
Throwable.class,
String.class),
block.load("T"),
constant(typeAndName)));
}
/**
* Used for properly setting a primitive field
*
* For example say that the class has a field of type long. Then we will generate the RHS of.
*
* userClass.longField = ((Long) invoke).longValue()
*
*
* @param fieldType the type of the field
* @param invoke the expression used to set the field
* @return an expression where casting and boxing/unboxing has been taken care of.
*/
private static Expression unboxIfNecessary(Class fieldType, Expression invoke) {
if (fieldType.isPrimitive()) {
return unbox(cast(toBoxedType(typeReference(fieldType)), invoke));
} else {
return cast(fieldType, invoke);
}
}
private static CodeGenerator codeGenerator(ClassLoader parentClassLoader)
throws CodeGenerationNotSupportedException {
if (DEBUG) {
return generateCode(parentClassLoader, SOURCECODE, PRINT_SOURCE);
} else {
return generateCode(parentClassLoader, BYTECODE);
}
}
private static byte asByte(AnyValue value) {
if (value instanceof ByteValue) {
return ((ByteValue) value).value();
} else {
throw new IllegalArgumentException(
"Cannot convert " + value.map(new DefaultValueMapper(null)) + " to byte for input to procedure");
}
}
/**
* Takes an expression evaluating to one of the supported java values and turns
* it into the corresponding AnyValue
*
* The expression is evaluated once and stored in a local variable
*
* @param block the surrounding code block in which the expression will be evaluated
* @param expressionVariableName the name of the local variable in which the evaluated expression will be stored.
* @param expression the expression to evaluate
* @param userType the type of the expression to map
* @return an expression properly mapped to AnyValue
*/
private static Expression toAnyValue(
CodeBlock block,
String expressionVariableName,
Expression expression,
Class userType,
Expression context) {
block.assign(userType, expressionVariableName, expression);
return toAnyValue(block.load(expressionVariableName), userType, context);
}
/**
* Takes an expression evaluating to one of the supported java values and turns
* it into the corresponding AnyValue
*
* The expression may be evaluated twice, depending on the userType.
* If the expression needs to be evaluated only once, use {@link #toAnyValue(CodeBlock, String, Expression, Class, Expression)}.
*
* @param expression the expression to evaluate
* @param userType the type of the expression to map
* @return an expression properly mapped to AnyValue
*/
private static Expression toAnyValue(Expression expression, Class userType, Expression context) {
if (AnyValue.class.isAssignableFrom(userType)) {
return nullCheck(expression, cast(userType, expression));
}
String type = userType.getCanonicalName();
if (type.equals(LONG)) {
return invoke(methodReference(Values.class, LongValue.class, "longValue", long.class), expression);
} else if (type.equals(BOXED_LONG)) {
return nullCheck(
expression,
invoke(methodReference(Values.class, LongValue.class, "longValue", long.class), unbox(expression)));
} else if (type.equals(DOUBLE)) {
return invoke(methodReference(Values.class, DoubleValue.class, "doubleValue", double.class), expression);
} else if (type.equals(BOXED_DOUBLE)) {
return nullCheck(
expression,
invoke(
methodReference(Values.class, DoubleValue.class, "doubleValue", double.class),
unbox(expression)));
} else if (type.equals(NUMBER)) {
return nullCheck(
expression,
invoke(methodReference(Values.class, NumberValue.class, "numberValue", Number.class), expression));
} else if (type.equals(BOOLEAN)) {
return invoke(methodReference(Values.class, BooleanValue.class, "booleanValue", boolean.class), expression);
} else if (type.equals(BOXED_BOOLEAN)) {
return nullCheck(
expression,
invoke(
methodReference(Values.class, BooleanValue.class, "booleanValue", boolean.class),
unbox(expression)));
} else if (type.equals(STRING)) {
return invoke(methodReference(Values.class, Value.class, "stringOrNoValue", String.class), expression);
} else if (type.equals(BYTE_ARRAY)) {
return nullCheck(
expression,
invoke(methodReference(Values.class, ByteArray.class, "byteArray", byte[].class), expression));
} else if (type.equals(LIST)) {
return nullCheck(
expression,
invoke(
methodReference(
ValueUtils.class, ListValue.class, "asListValue", Iterable.class, boolean.class),
expression,
constant(true)));
} else if (type.equals(MAP)) {
return nullCheck(
expression,
invoke(
methodReference(ValueUtils.class, MapValue.class, "asMapValue", Map.class, boolean.class),
expression,
constant(true)));
} else if (type.equals(ZONED_DATE_TIME)) {
return nullCheck(
expression,
invoke(
methodReference(DateTimeValue.class, DateTimeValue.class, "datetime", ZonedDateTime.class),
expression));
} else if (type.equals(OFFSET_TIME)) {
return nullCheck(
expression,
invoke(methodReference(TimeValue.class, TimeValue.class, "time", OffsetTime.class), expression));
} else if (type.equals(LOCAL_DATE)) {
return nullCheck(
expression,
invoke(methodReference(DateValue.class, DateValue.class, "date", LocalDate.class), expression));
} else if (type.equals(LOCAL_TIME)) {
return nullCheck(
expression,
invoke(
methodReference(LocalTimeValue.class, LocalTimeValue.class, "localTime", LocalTime.class),
expression));
} else if (type.equals(LOCAL_DATE_TIME)) {
return nullCheck(
expression,
invoke(
methodReference(
LocalDateTimeValue.class,
LocalDateTimeValue.class,
"localDateTime",
LocalDateTime.class),
expression));
} else if (type.equals(TEMPORAL_AMOUNT)) {
return nullCheck(
expression,
invoke(
methodReference(Values.class, DurationValue.class, "durationValue", TemporalAmount.class),
expression));
} else if (type.equals(NODE)) {
Expression internalTransaction = invoke(
context, methodReference(Context.class, InternalTransaction.class, "internalTransactionOrNull"));
Expression dbValidation = invoke(
internalTransaction,
methodReference(InternalTransaction.class, Entity.class, "validateSameDB", Entity.class),
expression);
Expression getNode = ternary(equal(internalTransaction, constant(null)), expression, dbValidation);
return nullCheck(
expression,
invoke(
methodReference(
ValueUtils.class, VirtualNodeValue.class, "maybeWrapNodeEntity", Node.class),
getNode));
} else if (type.equals(RELATIONSHIP)) {
Expression internalTransaction = invoke(
context, methodReference(Context.class, InternalTransaction.class, "internalTransactionOrNull"));
Expression dbValidation = invoke(
internalTransaction,
methodReference(InternalTransaction.class, Entity.class, "validateSameDB", Entity.class),
expression);
Expression getRelationship = ternary(equal(internalTransaction, constant(null)), expression, dbValidation);
return nullCheck(
expression,
invoke(
methodReference(
ValueUtils.class,
VirtualRelationshipValue.class,
"maybeWrapRelationshipEntity",
Relationship.class),
getRelationship));
} else if (type.equals(PATH)) {
return nullCheck(
expression,
invoke(
methodReference(ValueUtils.class, VirtualPathValue.class, "maybeWrapPath", Path.class),
expression));
} else if (type.equals(POINT)) {
return nullCheck(
expression,
invoke(
methodReference(ValueUtils.class, PointValue.class, "asPointValue", Point.class),
expression));
} else {
return invoke(
methodReference(ValueUtils.class, AnyValue.class, "of", Object.class, boolean.class),
expression,
constant(true));
}
}
/**
* Converts from an `AnyValue` to the type specified by the procedure or function.
*
* In a lot of cases we can figure out the conversion statically, for example `LongValue` will
* be turned into ((LongValue) value).longValue() etc. For composite types as Lists and Maps and also
* for Graph types such as Nodes, Relationships and Paths we will use a ValueMapper.
*
* @param expectedType the java type expected by the procedure or function
* @param expression an expression that will evaluate to an AnyValue
* @param block The current code block.
* @param context The current context.
* @return an expression properly typed to be consumed by function or procedure
*/
private static Expression fromAnyValue(
Class expectedType, Expression expression, CodeBlock block, Expression context) {
if (AnyValue.class.isAssignableFrom(expectedType)) {
return cast(expectedType, expression);
}
String type = expectedType.getCanonicalName();
if (type.equals(LONG)) {
return invoke(
cast(NumberValue.class, expression), methodReference(NumberValue.class, long.class, "longValue"));
} else if (type.equals(BOXED_LONG)) {
return noValueCheck(
expression,
box(invoke(
cast(NumberValue.class, expression),
methodReference(NumberValue.class, long.class, "longValue"))));
} else if (type.equals(DOUBLE)) {
return invoke(
cast(NumberValue.class, expression),
methodReference(NumberValue.class, double.class, "doubleValue"));
} else if (type.equals(BOXED_DOUBLE)) {
return noValueCheck(
expression,
box(invoke(
cast(NumberValue.class, expression),
methodReference(NumberValue.class, double.class, "doubleValue"))));
} else if (type.equals(NUMBER)) {
return noValueCheck(
expression,
invoke(
cast(NumberValue.class, expression),
methodReference(NumberValue.class, Number.class, "asObjectCopy")));
} else if (type.equals(BOOLEAN)) {
return invoke(
cast(BooleanValue.class, expression),
methodReference(BooleanValue.class, boolean.class, "booleanValue"));
} else if (type.equals(BOXED_BOOLEAN)) {
return noValueCheck(
expression,
box(invoke(
cast(BooleanValue.class, expression),
methodReference(BooleanValue.class, boolean.class, "booleanValue"))));
} else if (type.equals(STRING)) {
return noValueCheck(
expression,
invoke(
cast(TextValue.class, expression),
methodReference(TextValue.class, String.class, "stringValue")));
} else if (type.equals(BYTE_ARRAY)) {
return noValueCheck(
expression,
invoke(
methodReference(ProcedureCompilation.class, byte[].class, "toByteArray", AnyValue.class),
expression));
} else if (type.equals(ZONED_DATE_TIME)) {
return noValueCheck(
expression,
cast(
ZonedDateTime.class,
invoke(
cast(DateTimeValue.class, expression),
methodReference(DateTimeValue.class, Temporal.class, "asObjectCopy"))));
} else if (type.equals(OFFSET_TIME)) {
return noValueCheck(
expression,
cast(
OffsetTime.class,
invoke(
cast(TimeValue.class, expression),
methodReference(TimeValue.class, Temporal.class, "asObjectCopy"))));
} else if (type.equals(LOCAL_DATE)) {
return noValueCheck(
expression,
cast(
LocalDate.class,
invoke(
cast(DateValue.class, expression),
methodReference(DateValue.class, Temporal.class, "asObjectCopy"))));
} else if (type.equals(LOCAL_TIME)) {
return noValueCheck(
expression,
cast(
LocalTime.class,
invoke(
cast(LocalTimeValue.class, expression),
methodReference(LocalTimeValue.class, Temporal.class, "asObjectCopy"))));
} else if (type.equals(LOCAL_DATE_TIME)) {
return noValueCheck(
expression,
cast(
LocalDateTime.class,
invoke(
cast(LocalDateTimeValue.class, expression),
methodReference(LocalDateTimeValue.class, Temporal.class, "asObjectCopy"))));
} else if (type.equals(TEMPORAL_AMOUNT)) {
return noValueCheck(expression, cast(TemporalAmount.class, expression));
} else if (type.equals(POINT)) {
return noValueCheck(
expression,
invoke(
cast(PointValue.class, expression),
methodReference(PointValue.class, Point.class, "asObjectCopy")));
} else {
return cast(
expectedType,
invoke(
expression,
methodReference(AnyValue.class, Object.class, "map", ValueMapper.class),
invoke(context, methodReference(Context.class, ValueMapper.class, "valueMapper"))));
}
}
/**
* toCheck == null ? Values.NO_VALUE : onNotNull;
*/
private static Expression nullCheck(Expression toCheck, Expression onNotNull) {
return ternary(equal(toCheck, constant(null)), noValue(), onNotNull);
}
/**
* toCheck == NO_VALUE ? null : onNotNoValue;
*/
private static Expression noValueCheck(Expression toCheck, Expression onNotNoValue) {
return ternary(equal(toCheck, noValue()), constant(null), onNotNoValue);
}
/**
* @return Values.NO_VALUE;
*/
private static Expression noValue() {
return getStatic(field(typeReference(Values.class), typeReference(Value.class), "NO_VALUE"));
}
private static Expression[] parameters(CodeBlock block, Method methodToCall, Expression context) {
Class[] parameterTypes = methodToCall.getParameterTypes();
Expression[] parameters = new Expression[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
parameters[i] =
fromAnyValue(parameterTypes[i], arrayLoad(block.load("input"), constant(i)), block, context);
}
return parameters;
}
private static void injectFields(
CodeBlock block, List fieldSetters, List fieldsToSet) {
for (int i = 0; i < fieldSetters.size(); i++) {
FieldSetter setter = fieldSetters.get(i);
Field field = setter.field();
Class fieldType = field.getType();
block.put(
block.load(USER_CLASS),
field(field),
unboxIfNecessary(
fieldType,
invoke(
getStatic(fieldsToSet.get(i)),
methodReference(
typeReference(FieldSetter.class),
OBJECT,
"get",
typeReference(Context.class)),
block.load("ctx"))));
}
}
private static List createContextSetters(List fieldSetters, ClassGenerator generator) {
List fieldsToSet = new ArrayList<>(fieldSetters.size());
for (int i = 0; i < fieldSetters.size(); i++) {
fieldsToSet.add(generator.publicStaticField(typeReference(FieldSetter.class), "SETTER_" + i));
}
return fieldsToSet;
}
private static void setAllStaticFields(Object signature, List fieldSetters, Class clazz)
throws IllegalAccessException, NoSuchFieldException {
clazz.getDeclaredField(SIGNATURE_NAME).set(null, signature);
setAllStaticFields(fieldSetters, clazz);
}
private static void setAllStaticFields(List fieldSetters, Class clazz)
throws IllegalAccessException, NoSuchFieldException {
for (int i = 0; i < fieldSetters.size(); i++) {
clazz.getDeclaredField("SETTER_" + i).set(null, fieldSetters.get(i));
}
}
}