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chore: moved methods around, should now be a lot more organised

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zaaarf 2023-03-16 15:40:11 +01:00
parent dca13711d5
commit 2999aef5a5
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3 changed files with 276 additions and 247 deletions
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176
src/main/java/ftbsc/lll/processor/LilleroProcessor.java
View file

@ -4,8 +4,6 @@ import com.squareup.javapoet.*;
import ftbsc.lll.IInjector; import ftbsc.lll.IInjector;
import ftbsc.lll.exceptions.AmbiguousDefinitionException; import ftbsc.lll.exceptions.AmbiguousDefinitionException;
import ftbsc.lll.exceptions.InvalidResourceException; import ftbsc.lll.exceptions.InvalidResourceException;
import ftbsc.lll.exceptions.MappingNotFoundException;
import ftbsc.lll.exceptions.TargetNotFoundException;
import ftbsc.lll.processor.annotations.*; import ftbsc.lll.processor.annotations.*;
import ftbsc.lll.processor.tools.obfuscation.ObfuscationMapper; import ftbsc.lll.processor.tools.obfuscation.ObfuscationMapper;
import ftbsc.lll.proxies.FieldProxy; import ftbsc.lll.proxies.FieldProxy;
@ -21,16 +19,15 @@ import javax.tools.FileObject;
import javax.tools.JavaFileObject; import javax.tools.JavaFileObject;
import javax.tools.StandardLocation; import javax.tools.StandardLocation;
import java.io.*; import java.io.*;
import java.lang.annotation.Annotation;
import java.net.URI; import java.net.URI;
import java.net.URISyntaxException; import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets; import java.nio.charset.StandardCharsets;
import java.util.*; import java.util.*;
import java.util.function.Function;
import java.util.stream.Collectors; import java.util.stream.Collectors;
import static ftbsc.lll.processor.tools.ASTUtils.*; import static ftbsc.lll.processor.tools.ASTUtils.*;
import static ftbsc.lll.processor.tools.ASTUtils.getClassFullyQualifiedName; import static ftbsc.lll.processor.tools.ASTUtils.getClassFullyQualifiedName;
import static ftbsc.lll.processor.tools.JavaPoetUtils.*;
/** /**
* The actual annotation processor behind the magic. * The actual annotation processor behind the magic.
@ -59,6 +56,7 @@ public class LilleroProcessor extends AbstractProcessor {
* @param processingEnv environment to access facilities the tool framework * @param processingEnv environment to access facilities the tool framework
* provides to the processor * provides to the processor
* @throws IllegalStateException if this method is called more than once. * @throws IllegalStateException if this method is called more than once.
* @since 0.3.0
*/ */
@Override @Override
public synchronized void init(ProcessingEnvironment processingEnv) { public synchronized void init(ProcessingEnvironment processingEnv) {
@ -147,153 +145,6 @@ public class LilleroProcessor extends AbstractProcessor {
} }
} }
/**
* Finds the class name and maps it to the correct format.
* @param name the fully qualified name of the class to convert
* @param mapper the {@link ObfuscationMapper} to use, may be null
* @return the fully qualified class name
* @since 0.3.0
*/
private static String findClassName(String name, ObfuscationMapper mapper) {
try {
return mapper == null ? name : mapper.obfuscateClass(name).replace('/', '.');
} catch(MappingNotFoundException e) {
return name;
}
}
/**
* Finds the class name and maps it to the correct format.
*
* @param patchAnn the {@link Patch} annotation containing target class info
* @param finderAnn an annotation containing metadata to fall back on, may be null
* @param parentFun the function to get the parent from the finderAnn
* @return the fully qualified class name
* @since 0.3.0
*/
private static <T extends Annotation> String findClassName(Patch patchAnn, T finderAnn, Function<T, Class<?>> parentFun) {
String fullyQualifiedName =
finderAnn == null || parentFun.apply(finderAnn) == Object.class
? getClassFullyQualifiedName(patchAnn, Patch::value)
: getClassFullyQualifiedName(finderAnn, parentFun);
return findClassName(fullyQualifiedName, null);
}
/**
* Finds the member name and maps it to the correct format.
* @param parentFQN the already mapped FQN of the parent class
* @param memberName the name of the member
* @param mapper the {@link ObfuscationMapper} to use, may be null
* @return the internal class name
* @since 0.3.0
*/
private static String findMemberName(String parentFQN, String memberName, String methodDescriptor, ObfuscationMapper mapper) {
try {
return mapper == null ? memberName : mapper.obfuscateMember(parentFQN, memberName, methodDescriptor);
} catch(MappingNotFoundException e) {
return memberName;
}
}
/**
* Finds a method given name, container and descriptor.
* @param parentFQN the fully qualified name of the parent class of the method
* @param name the name to search for
* @param descr the descriptor to search for
* @param strict whether the search should be strict (see {@link Target#strict()} for more info)
* @return the desired method, if it exists
* @throws AmbiguousDefinitionException if it finds more than one candidate
* @throws TargetNotFoundException if it finds no valid candidate
* @since 0.3.0
*/
private ExecutableElement findMethod(String parentFQN, String name, String descr, boolean strict) {
TypeElement parent = processingEnv.getElementUtils().getTypeElement(parentFQN);
if(parent == null)
throw new AmbiguousDefinitionException(String.format("Could not find parent class %s!", parentFQN));
//try to find by name
List<ExecutableElement> candidates = parent.getEnclosedElements()
.stream()
.filter(e -> e instanceof ExecutableElement)
.map(e -> (ExecutableElement) e)
.filter(e -> e.getSimpleName().contentEquals(name))
.collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(String.format("%s %s", name, descr));
if(candidates.size() == 1 && !strict)
return candidates.get(0);
if(descr == null) {
throw new AmbiguousDefinitionException(
String.format("Found %d methods named %s in class %s!", candidates.size(), name, parentFQN)
);
} else {
candidates = candidates.stream()
.filter(strict
? c -> descr.equals(descriptorFromExecutableElement(c))
: c -> descr.split("\\)")[0].equalsIgnoreCase(descriptorFromExecutableElement(c).split("\\)")[0])
).collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(String.format("%s %s", name, descr));
if(candidates.size() > 1)
throw new AmbiguousDefinitionException(
String.format("Found %d methods named %s in class %s!", candidates.size(), name, parentFQN)
);
return candidates.get(0);
}
}
/**
* Finds the real class member (field or method) corresponding to a stub annotated with
* {@link Target} or {@link FindMethod} or {@link FindField}.
* @param stub the {@link ExecutableElement} for the stub
* @return the {@link Element} corresponding to the method or field
* @throws AmbiguousDefinitionException if it finds more than one candidate
* @throws TargetNotFoundException if it finds no valid candidate
* @since 0.3.0
*/
private Element findMemberFromStub(ExecutableElement stub) {
//the parent always has a @Patch annotation
Patch patchAnn = stub.getEnclosingElement().getAnnotation(Patch.class);
//there should ever only be one of these
Target targetAnn = stub.getAnnotation(Target.class); //if this is null strict mode is always disabled
FindMethod findMethodAnn = stub.getAnnotation(FindMethod.class); //this may be null, it means no fallback info
FindField findFieldAnn = stub.getAnnotation(FindField.class);
String parentFQN, memberName;
if(findFieldAnn == null) { //methods
parentFQN = findClassName(patchAnn, findMethodAnn, FindMethod::parent);
String methodDescriptor =
findMethodAnn != null
? methodDescriptorFromParams(findMethodAnn, FindMethod::params, processingEnv.getElementUtils())
: descriptorFromExecutableElement(stub);
memberName =
findMethodAnn != null && !findMethodAnn.name().equals("")
? findMethodAnn.name()
: stub.getSimpleName().toString();
return findMethod(
parentFQN,
memberName,
methodDescriptor,
targetAnn != null && targetAnn.strict()
);
} else { //fields
parentFQN = findClassName(patchAnn, findFieldAnn, FindField::parent);
memberName = findFieldAnn.name().equals("")
? stub.getSimpleName().toString()
: findFieldAnn.name();
TypeElement parent = processingEnv.getElementUtils().getTypeElement(parentFQN);
List<VariableElement> candidates =
parent.getEnclosedElements()
.stream()
.filter(f -> f instanceof VariableElement)
.filter(f -> f.getSimpleName().contentEquals(memberName))
.map(f -> (VariableElement) f)
.collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(stub.getSimpleName().toString());
else return candidates.get(0); //there can only ever be one
}
}
/** /**
* Generates the Injector(s) contained in the given class. * Generates the Injector(s) contained in the given class.
* Basically implements the {@link IInjector} interface for you. * Basically implements the {@link IInjector} interface for you.
@ -448,21 +299,6 @@ public class LilleroProcessor extends AbstractProcessor {
} }
} }
/**
* Builds a {@link MethodSpec} for a public method whose body simply returns a {@link String}.
* @param name the name of the method
* @param returnString the {@link String} to return
* @return the built {@link MethodSpec}
*/
private static MethodSpec buildStringReturnMethod(String name, String returnString) {
return MethodSpec.methodBuilder(name)
.addModifiers(Modifier.PUBLIC)
.addAnnotation(Override.class)
.returns(String.class)
.addStatement("return $S", returnString)
.build();
}
/** /**
* Finds any method annotated with {@link FindMethod} or {@link FindField} within the given * Finds any method annotated with {@link FindMethod} or {@link FindField} within the given
* class, and builds the {@link MethodSpec} necessary for building it. * class, and builds the {@link MethodSpec} necessary for building it.
@ -477,7 +313,7 @@ public class LilleroProcessor extends AbstractProcessor {
.filter(m -> !m.getModifiers().contains(Modifier.STATIC)) //skip static stuff as we can't override it .filter(m -> !m.getModifiers().contains(Modifier.STATIC)) //skip static stuff as we can't override it
.filter(m -> !m.getModifiers().contains(Modifier.FINAL)) //in case someone is trying to be funny .filter(m -> !m.getModifiers().contains(Modifier.FINAL)) //in case someone is trying to be funny
.forEach(m -> { .forEach(m -> {
ExecutableElement targetMethod = (ExecutableElement) findMemberFromStub(m); ExecutableElement targetMethod = (ExecutableElement) findMemberFromStub(m, processingEnv);
MethodSpec.Builder b = MethodSpec.overriding(m); MethodSpec.Builder b = MethodSpec.overriding(m);
String targetParentFQN = findClassName(((TypeElement) targetMethod.getEnclosingElement()).getQualifiedName().toString(), mapper); String targetParentFQN = findClassName(((TypeElement) targetMethod.getEnclosingElement()).getQualifiedName().toString(), mapper);
@ -506,7 +342,7 @@ public class LilleroProcessor extends AbstractProcessor {
.filter(m -> !m.getModifiers().contains(Modifier.STATIC)) .filter(m -> !m.getModifiers().contains(Modifier.STATIC))
.filter(m -> !m.getModifiers().contains(Modifier.FINAL)) .filter(m -> !m.getModifiers().contains(Modifier.FINAL))
.forEach(m -> { .forEach(m -> {
VariableElement targetField = (VariableElement) findMemberFromStub(m); VariableElement targetField = (VariableElement) findMemberFromStub(m, processingEnv);
MethodSpec.Builder b = MethodSpec.overriding(m); MethodSpec.Builder b = MethodSpec.overriding(m);
String targetParentFQN = findClassName(((TypeElement) targetField.getEnclosingElement()).getQualifiedName().toString(), mapper); String targetParentFQN = findClassName(((TypeElement) targetField.getEnclosingElement()).getQualifiedName().toString(), mapper);
@ -551,7 +387,7 @@ public class LilleroProcessor extends AbstractProcessor {
* Container for information about a class that is to be generated. * Container for information about a class that is to be generated.
* Only used internally. * Only used internally.
*/ */
public class InjectorInfo { private class InjectorInfo {
/** /**
* The {@link ExecutableElement} corresponding to the injector method. * The {@link ExecutableElement} corresponding to the injector method.
*/ */
@ -575,7 +411,7 @@ public class LilleroProcessor extends AbstractProcessor {
public InjectorInfo(ExecutableElement injector, ExecutableElement targetStub) { public InjectorInfo(ExecutableElement injector, ExecutableElement targetStub) {
this.injector = injector; this.injector = injector;
this.targetStub = targetStub; this.targetStub = targetStub;
this.target = (ExecutableElement) findMemberFromStub(targetStub); this.target = (ExecutableElement) findMemberFromStub(targetStub, processingEnv);
} }
} }
} }

237
src/main/java/ftbsc/lll/processor/tools/ASTUtils.java
View file

@ -1,12 +1,17 @@
package ftbsc.lll.processor.tools; package ftbsc.lll.processor.tools;
import com.squareup.javapoet.*; import com.squareup.javapoet.*;
import ftbsc.lll.tools.DescriptorBuilder; import ftbsc.lll.exceptions.AmbiguousDefinitionException;
import ftbsc.lll.exceptions.MappingNotFoundException;
import ftbsc.lll.exceptions.TargetNotFoundException;
import ftbsc.lll.processor.annotations.FindField;
import ftbsc.lll.processor.annotations.FindMethod;
import ftbsc.lll.processor.annotations.Patch;
import ftbsc.lll.processor.annotations.Target;
import ftbsc.lll.processor.tools.obfuscation.ObfuscationMapper;
import javax.annotation.processing.ProcessingEnvironment; import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.ExecutableElement; import javax.lang.model.element.*;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.MirroredTypeException; import javax.lang.model.type.MirroredTypeException;
import javax.lang.model.type.MirroredTypesException; import javax.lang.model.type.MirroredTypesException;
import javax.lang.model.type.TypeMirror; import javax.lang.model.type.TypeMirror;
@ -18,8 +23,11 @@ import java.util.List;
import java.util.function.Function; import java.util.function.Function;
import java.util.stream.Collectors; import java.util.stream.Collectors;
import static ftbsc.lll.processor.tools.JavaPoetUtils.descriptorFromExecutableElement;
import static ftbsc.lll.processor.tools.JavaPoetUtils.methodDescriptorFromParams;
/** /**
* Collection of static utils that didn't really fit into the main class. * Collection of AST-related static utils that didn't really fit into the main class.
*/ */
public class ASTUtils { public class ASTUtils {
/** /**
@ -38,67 +46,6 @@ public class ASTUtils {
.collect(Collectors.toList()); .collect(Collectors.toList());
} }
/**
* Builds a type descriptor from the given {@link TypeName}.
* @param type the {@link TypeName} representing the desired type
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromType(TypeName type) {
StringBuilder desc = new StringBuilder();
//add array brackets
while(type instanceof ArrayTypeName) {
desc.append("[");
type = ((ArrayTypeName) type).componentType;
}
if(type instanceof ClassName || type instanceof ParameterizedTypeName) {
ClassName var = type instanceof ParameterizedTypeName ? ((ParameterizedTypeName) type).rawType : (ClassName) type;
desc.append(DescriptorBuilder.nameToDescriptor(var.canonicalName(), 0));
} else {
if(TypeName.BOOLEAN.equals(type))
desc.append("Z");
else if(TypeName.CHAR.equals(type))
desc.append("C");
else if(TypeName.BYTE.equals(type))
desc.append("B");
else if(TypeName.SHORT.equals(type))
desc.append("S");
else if(TypeName.INT.equals(type))
desc.append("I");
else if(TypeName.FLOAT.equals(type))
desc.append("F");
else if(TypeName.LONG.equals(type))
desc.append("J");
else if(TypeName.DOUBLE.equals(type))
desc.append("D");
else if(TypeName.VOID.equals(type))
desc.append("V");
}
return desc.toString();
}
/**
* Builds a type descriptor from the given {@link TypeMirror}.
* @param t the {@link TypeMirror} representing the desired type
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromType(TypeMirror t) {
return descriptorFromType(TypeName.get(t));
}
/**
* Builds a method descriptor from the given {@link ExecutableElement}.
* @param m the {@link ExecutableElement} for the method
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromExecutableElement(ExecutableElement m) {
StringBuilder methodSignature = new StringBuilder();
methodSignature.append("(");
m.getParameters().forEach(p -> methodSignature.append(descriptorFromType(p.asType())));
methodSignature.append(")");
methodSignature.append(descriptorFromType(m.getReturnType()));
return methodSignature.toString();
}
/** /**
* Maps a {@link javax.lang.model.element.Modifier} to its reflective * Maps a {@link javax.lang.model.element.Modifier} to its reflective
* {@link java.lang.reflect.Modifier} equivalent. * {@link java.lang.reflect.Modifier} equivalent.
@ -172,18 +119,154 @@ public class ASTUtils {
return params; return params;
} }
/** /**
* Builds a (partial, not including the return type) method descriptor from its parameters * Finds the class name and maps it to the correct format.
* @param ann the annotation containing the class * @param name the fully qualified name of the class to convert
* @param fun the annotation function returning the class * @param mapper the {@link ObfuscationMapper} to use, may be null
* @return the method descriptor * @return the fully qualified class name
* @since 0.3.0
*/ */
public static <T extends Annotation> String methodDescriptorFromParams(T ann, Function<T, Class<?>[]> fun, Elements elementUtils) { public static String findClassName(String name, ObfuscationMapper mapper) {
List<TypeMirror> mirrors = classArrayFromAnnotation(ann, fun, elementUtils); try {
StringBuilder sb = new StringBuilder("("); return mapper == null ? name : mapper.obfuscateClass(name).replace('/', '.');
for(TypeMirror t : mirrors) } catch(MappingNotFoundException e) {
sb.append(descriptorFromType(t)); return name;
sb.append(")"); }
return sb.toString(); }
/**
* Finds the class name and maps it to the correct format.
*
* @param patchAnn the {@link Patch} annotation containing target class info
* @param finderAnn an annotation containing metadata to fall back on, may be null
* @param parentFun the function to get the parent from the finderAnn
* @return the fully qualified class name
* @since 0.3.0
*/
private static <T extends Annotation> String findClassName(Patch patchAnn, T finderAnn, Function<T, Class<?>> parentFun) {
String fullyQualifiedName =
finderAnn == null || parentFun.apply(finderAnn) == Object.class
? getClassFullyQualifiedName(patchAnn, Patch::value)
: getClassFullyQualifiedName(finderAnn, parentFun);
return findClassName(fullyQualifiedName, null);
}
/**
* Finds the member name and maps it to the correct format.
* @param parentFQN the already mapped FQN of the parent class
* @param memberName the name of the member
* @param mapper the {@link ObfuscationMapper} to use, may be null
* @return the internal class name
* @since 0.3.0
*/
public static String findMemberName(String parentFQN, String memberName, String methodDescriptor, ObfuscationMapper mapper) {
try {
return mapper == null ? memberName : mapper.obfuscateMember(parentFQN, memberName, methodDescriptor);
} catch(MappingNotFoundException e) {
return memberName;
}
}
/**
* Finds a method given name, container and descriptor.
* @param parentFQN the fully qualified name of the parent class of the method
* @param name the name to search for
* @param descr the descriptor to search for
* @param strict whether the search should be strict (see {@link Target#strict()} for more info)
* @param env the {@link ProcessingEnvironment} to perform the operation in
* @return the desired method, if it exists
* @throws AmbiguousDefinitionException if it finds more than one candidate
* @throws TargetNotFoundException if it finds no valid candidate
* @since 0.3.0
*/
private static ExecutableElement findMethod(String parentFQN, String name, String descr, boolean strict, ProcessingEnvironment env) {
TypeElement parent = env.getElementUtils().getTypeElement(parentFQN);
if(parent == null)
throw new AmbiguousDefinitionException(String.format("Could not find parent class %s!", parentFQN));
//try to find by name
List<ExecutableElement> candidates = parent.getEnclosedElements()
.stream()
.filter(e -> e instanceof ExecutableElement)
.map(e -> (ExecutableElement) e)
.filter(e -> e.getSimpleName().contentEquals(name))
.collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(String.format("%s %s", name, descr));
if(candidates.size() == 1 && !strict)
return candidates.get(0);
if(descr == null) {
throw new AmbiguousDefinitionException(
String.format("Found %d methods named %s in class %s!", candidates.size(), name, parentFQN)
);
} else {
candidates = candidates.stream()
.filter(strict
? c -> descr.equals(descriptorFromExecutableElement(c))
: c -> descr.split("\\)")[0].equalsIgnoreCase(descriptorFromExecutableElement(c).split("\\)")[0])
).collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(String.format("%s %s", name, descr));
if(candidates.size() > 1)
throw new AmbiguousDefinitionException(
String.format("Found %d methods named %s in class %s!", candidates.size(), name, parentFQN)
);
return candidates.get(0);
}
}
/**
* Finds the real class member (field or method) corresponding to a stub annotated with
* {@link Target} or {@link FindMethod} or {@link FindField}.
* @param stub the {@link ExecutableElement} for the stub
* @param env the {@link ProcessingEnvironment} to perform the operation in
* @return the {@link Element} corresponding to the method or field
* @throws AmbiguousDefinitionException if it finds more than one candidate
* @throws TargetNotFoundException if it finds no valid candidate
* @since 0.3.0
*/
public static Element findMemberFromStub(ExecutableElement stub, ProcessingEnvironment env) {
//the parent always has a @Patch annotation
Patch patchAnn = stub.getEnclosingElement().getAnnotation(Patch.class);
//there should ever only be one of these
Target targetAnn = stub.getAnnotation(Target.class); //if this is null strict mode is always disabled
FindMethod findMethodAnn = stub.getAnnotation(FindMethod.class); //this may be null, it means no fallback info
FindField findFieldAnn = stub.getAnnotation(FindField.class);
String parentFQN, memberName;
if(findFieldAnn == null) { //methods
parentFQN = findClassName(patchAnn, findMethodAnn, FindMethod::parent);
String methodDescriptor =
findMethodAnn != null
? methodDescriptorFromParams(findMethodAnn, FindMethod::params, env.getElementUtils())
: descriptorFromExecutableElement(stub);
memberName =
findMethodAnn != null && !findMethodAnn.name().equals("")
? findMethodAnn.name()
: stub.getSimpleName().toString();
return findMethod(
parentFQN,
memberName,
methodDescriptor,
targetAnn != null && targetAnn.strict(),
env
);
} else { //fields
parentFQN = findClassName(patchAnn, findFieldAnn, FindField::parent);
memberName = findFieldAnn.name().equals("")
? stub.getSimpleName().toString()
: findFieldAnn.name();
TypeElement parent = env.getElementUtils().getTypeElement(parentFQN);
List<VariableElement> candidates =
parent.getEnclosedElements()
.stream()
.filter(f -> f instanceof VariableElement)
.filter(f -> f.getSimpleName().contentEquals(memberName))
.map(f -> (VariableElement) f)
.collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(stub.getSimpleName().toString());
else return candidates.get(0); //there can only ever be one
}
} }
} }

110
src/main/java/ftbsc/lll/processor/tools/JavaPoetUtils.java Normal file
View file

@ -0,0 +1,110 @@
package ftbsc.lll.processor.tools;
import com.squareup.javapoet.*;
import ftbsc.lll.tools.DescriptorBuilder;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import java.lang.annotation.Annotation;
import java.util.List;
import java.util.function.Function;
import static ftbsc.lll.processor.tools.ASTUtils.classArrayFromAnnotation;
/**
* Collection of static utils that rely on JavaPoet to function.
*/
public class JavaPoetUtils {
/**
* Builds a {@link MethodSpec} for a public method whose body simply returns a {@link String}.
* @param name the name of the method
* @param returnString the {@link String} to return
* @return the built {@link MethodSpec}
*/
public static MethodSpec buildStringReturnMethod(String name, String returnString) {
return MethodSpec.methodBuilder(name)
.addModifiers(Modifier.PUBLIC)
.addAnnotation(Override.class)
.returns(String.class)
.addStatement("return $S", returnString)
.build();
}
/**
* Builds a type descriptor from the given {@link TypeName}.
* @param type the {@link TypeName} representing the desired type
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromType(TypeName type) {
StringBuilder desc = new StringBuilder();
//add array brackets
while(type instanceof ArrayTypeName) {
desc.append("[");
type = ((ArrayTypeName) type).componentType;
}
if(type instanceof ClassName || type instanceof ParameterizedTypeName) {
ClassName var = type instanceof ParameterizedTypeName ? ((ParameterizedTypeName) type).rawType : (ClassName) type;
desc.append(DescriptorBuilder.nameToDescriptor(var.canonicalName(), 0));
} else {
if(TypeName.BOOLEAN.equals(type))
desc.append("Z");
else if(TypeName.CHAR.equals(type))
desc.append("C");
else if(TypeName.BYTE.equals(type))
desc.append("B");
else if(TypeName.SHORT.equals(type))
desc.append("S");
else if(TypeName.INT.equals(type))
desc.append("I");
else if(TypeName.FLOAT.equals(type))
desc.append("F");
else if(TypeName.LONG.equals(type))
desc.append("J");
else if(TypeName.DOUBLE.equals(type))
desc.append("D");
else if(TypeName.VOID.equals(type))
desc.append("V");
}
return desc.toString();
}
/**
* Builds a type descriptor from the given {@link TypeMirror}.
* @param t the {@link TypeMirror} representing the desired type
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromType(TypeMirror t) {
return descriptorFromType(TypeName.get(t));
}
/**
* Builds a method descriptor from the given {@link ExecutableElement}.
* @param m the {@link ExecutableElement} for the method
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromExecutableElement(ExecutableElement m) {
StringBuilder methodSignature = new StringBuilder();
methodSignature.append("(");
m.getParameters().forEach(p -> methodSignature.append(descriptorFromType(p.asType())));
methodSignature.append(")");
methodSignature.append(descriptorFromType(m.getReturnType()));
return methodSignature.toString();
}
/**
* Builds a (partial, not including the return type) method descriptor from its parameters
* @param ann the annotation containing the class
* @param fun the annotation function returning the class
* @return the method descriptor
*/
public static <T extends Annotation> String methodDescriptorFromParams(T ann, Function<T, Class<?>[]> fun, Elements elementUtils) {
List<TypeMirror> mirrors = classArrayFromAnnotation(ann, fun, elementUtils);
StringBuilder sb = new StringBuilder("(");
for(TypeMirror t : mirrors)
sb.append(descriptorFromType(t));
sb.append(")");
return sb.toString();
}
}