org.walkmod.javalang.compiler.reflection.CompatibleMethodReferencePredicate Maven / Gradle / Ivy
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Library of compiler components to processs Java code.
/*
* Copyright (C) 2015 Raquel Pau and Albert Coroleu.
*
* Walkmod is free software: you can redistribute it and/or modify it under the terms of the GNU
* Lesser General Public License as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* Walkmod 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with Walkmod. If
* not, see extends CompatibleArgsPredicate implements Predicate {
private MethodReferenceExpr expression = null;
private VoidVisitor typeResolver;
private A ctx;
private SymbolType sd;
private List methodCallCandidates = null;
private SymbolTable symTable;
private Class thisClass;
private Method[] methodsArray = null;
public CompatibleMethodReferencePredicate(MethodReferenceExpr expression, VoidVisitor typeResolver, A ctx,
Map mapping, SymbolTable symTable) {
this.expression = expression;
this.typeResolver = typeResolver;
this.symTable = symTable;
this.ctx = ctx;
setTypeMapping(mapping);
thisClass = symTable.getType("this").getClazz();
}
@Override
public boolean filter(T elem) throws Exception {
int elemParameterCount = 0;
Type[] genericParameterTypes = null;
Class declaringClass = null;
if (elem instanceof Method) {
elemParameterCount = ((Method) elem).getParameterTypes().length;
genericParameterTypes = ((Method) elem).getGenericParameterTypes();
declaringClass = ((Method) elem).getDeclaringClass();
} else if (elem instanceof Constructor) {
elemParameterCount = ((Constructor) elem).getParameterTypes().length;
genericParameterTypes = ((Constructor) elem).getGenericParameterTypes();
declaringClass = ((Constructor) elem).getDeclaringClass();
} else {
return false;
}
Object equivalentMethod = null;
sd = (SymbolType) expression.getScope().getSymbolData();
if (sd == null) {
expression.getScope().accept(typeResolver, ctx);
sd = (SymbolType) expression.getScope().getSymbolData();
if (!expression.getIdentifier().equals("new")) {
if (methodsArray == null) {
Set methods = MethodInspector.getVisibleMethods(sd.getClazz(), thisClass);
methodsArray = new Method[methods.size()];
methods.toArray(methodsArray);
ExecutableSorter sorter = new ExecutableSorter();
List sortedMethods = sorter.sort(methodsArray, null);
sortedMethods.toArray(methodsArray);
}
ArrayFilter filter = new ArrayFilter(methodsArray);
filter.appendPredicate(new MethodsByNamePredicate(expression.getIdentifier()));
methodCallCandidates = filter.filter();
}
}
boolean found = false;
if (!expression.getIdentifier().equals("new")) {
Iterator it = methodCallCandidates.iterator();
while (it.hasNext() && !found) {
Method md = it.next();
int mdParameterCount = md.getParameterTypes().length;
Map typeMapping = getTypeMapping();
FunctionalGenericsBuilder builder =
new FunctionalGenericsBuilder(md, typeResolver, typeMapping);
builder.build(expression);
SymbolType[] args = builder.getArgs();
if (!Modifier.isStatic(md.getModifiers())) {
if (mdParameterCount == elemParameterCount - 1) {
// may be, just taking into account the type variables,
// it matches
SymbolType[] genericArgs = new SymbolType[genericParameterTypes.length];
boolean allAreGenerics = true;
for (int i = 0; i < genericParameterTypes.length && allAreGenerics; i++) {
if (genericParameterTypes[i] instanceof TypeVariable) {
TypeVariable td = (TypeVariable) genericParameterTypes[i];
genericArgs[i] = typeMapping.get(td.getName());
allAreGenerics = genericArgs[i] != null;
} else {
allAreGenerics = false;
}
}
if (allAreGenerics) {
setTypeArgs(genericArgs);
found = super.filter(elem);
} else {
// the implicit parameter is an argument of the
// invisible
// lambda
SymbolType[] staticArgs = new SymbolType[args.length + 1];
for (int i = 0; i < args.length; i++) {
staticArgs[i + 1] = args[i];
}
staticArgs[0] = (SymbolType) sd;
args = staticArgs;
setTypeArgs(args);
found = super.filter(elem);
}
} else {
Expression scope = expression.getScope();
SymbolType stype = (SymbolType) scope.getSymbolData();
boolean isField = stype.getField() != null;
boolean isVariable = false;
boolean isSuper = scope instanceof SuperExpr;
if (!isField && !isSuper) {
String name = scope.toString();
isVariable = (symTable.findSymbol(name, ReferenceType.VARIABLE) != null);
}
// it is a variable
if ((isField || isVariable || isSuper) && mdParameterCount == elemParameterCount) {
setTypeArgs(args);
found = super.filter(elem);
}
}
} else if (mdParameterCount == elemParameterCount) {
setTypeArgs(args);
found = super.filter(elem);
}
if (found) {
equivalentMethod = md;
}
}
} else {
Constructor[] constructors = sd.getClazz().getDeclaredConstructors();
for (int i = 0; i < constructors.length && !found; i++) {
FunctionalGenericsBuilder builder =
new FunctionalGenericsBuilder(constructors[i], typeResolver,
getTypeMapping());
builder.build(expression);
SymbolType[] args = builder.getArgs();
setTypeArgs(args);
found = super.filter(elem);
if (found) {
equivalentMethod = constructors[i];
}
}
}
if (found && elem instanceof Method) {
Map mapping = getTypeMapping();
SymbolType realResultType = null;
if (equivalentMethod instanceof Method) {
// R apply(T t); -> Quote::parse ( T= String y R = Quote)
realResultType = SymbolType.valueOf((Method) equivalentMethod, mapping);
java.lang.reflect.Type genericReturnType = ((Method) elem).getGenericReturnType();
resolveTypeMapping(genericReturnType, realResultType, mapping);
}
realResultType = SymbolType.valueOf(declaringClass, mapping);
expression.setSymbolData(realResultType);
SymbolType st = SymbolType.valueOf((Method) elem, mapping);
expression.setReferencedMethodSymbolData(st);
expression.setReferencedArgsSymbolData(getTypeArgs());
}
return found;
}
private void resolveTypeMapping(java.lang.reflect.Type type, SymbolType reference,
Map mapping) {
if (type instanceof TypeVariable) {
TypeVariable tv = (TypeVariable) type;
SymbolType st = mapping.get(tv.getName());
if (st == null || "java.lang.Object".equals(st.getName())) {
mapping.put(tv.getName(), reference);
} else {
mapping.put(tv.getName(), (SymbolType) reference.merge(st));
}
}
}
}
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