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Uber-fast, ultra-lightweight Java classpath scanner. Scans the classpath by parsing the classfile binary format directly rather than by using reflection.
See https://github.com/lukehutch/fast-classpath-scanner
/*
* This file is part of FastClasspathScanner.
*
* Author: Luke Hutchison
*
* Hosted at: https://github.com/lukehutch/fast-classpath-scanner
*
* --
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Luke Hutchison
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the Software without restriction, including without
* limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
* LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
* EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
* OR OTHER DEALINGS IN THE SOFTWARE.
*/
package io.github.lukehutch.fastclasspathscanner.scanner;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import io.github.lukehutch.fastclasspathscanner.scanner.ScanResult.InfoObject;
import io.github.lukehutch.fastclasspathscanner.typesignature.ArrayTypeSignature;
import io.github.lukehutch.fastclasspathscanner.typesignature.ClassRefOrTypeVariableSignature;
import io.github.lukehutch.fastclasspathscanner.typesignature.MethodTypeSignature;
import io.github.lukehutch.fastclasspathscanner.typesignature.TypeParameter;
import io.github.lukehutch.fastclasspathscanner.typesignature.TypeSignature;
import io.github.lukehutch.fastclasspathscanner.typesignature.TypeUtils;
/**
* Holds metadata about methods of a class encountered during a scan. All values are taken directly out of the
* classfile for the class.
*/
public class MethodInfo extends InfoObject implements Comparable {
/** Defining class name. */
private final String className;
/** Defining class ClassInfo. */
ClassInfo classInfo;
/** Method name. */
private final String methodName;
/** Method modifiers. */
private final int modifiers;
/** Method annotations. */
final List annotationInfo;
/**
* The JVM-internal type descriptor (missing type parameters, but including types for synthetic and mandated
* method parameters).
*/
private final String typeDescriptorStr;
/** The parsed type descriptor. */
private MethodTypeSignature typeDescriptor;
/**
* The type signature (may have type parameter information included, if present and available). Method parameter
* types are unaligned.
*/
private final String typeSignatureStr;
/** The parsed type signature (or null if none). Method parameter types are unaligned. */
private MethodTypeSignature typeSignature;
/**
* Unaligned parameter names. These are only produced in JDK8+, and only if the commandline switch `-parameters`
* is provided at compiletime.
*/
private final String[] parameterNames;
/**
* Unaligned parameter modifiers. These are only produced in JDK8+, and only if the commandline switch
* `-parameters` is provided at compiletime.
*/
private final int[] parameterModifiers;
/** Unaligned parameter annotations */
final AnnotationInfo[][] parameterAnnotationInfo;
/** Aligned method parameter info */
private MethodParameterInfo[] methodParameterInfo;
private ScanResult scanResult;
/** Sets back-reference to scan result after scan is complete. */
@Override
void setScanResult(final ScanResult scanResult) {
this.scanResult = scanResult;
if (this.annotationInfo != null) {
for (int i = 0; i < this.annotationInfo.size(); i++) {
final AnnotationInfo ai = this.annotationInfo.get(i);
ai.setScanResult(scanResult);
}
}
if (this.parameterAnnotationInfo != null) {
for (int i = 0; i < this.parameterAnnotationInfo.length; i++) {
final AnnotationInfo[] pai = this.parameterAnnotationInfo[i];
if (pai != null) {
for (final AnnotationInfo ai : pai) {
ai.setScanResult(scanResult);
}
}
}
}
}
/**
* @param className
* The name of the enclosing class.
* @param methodName
* The name of the method.
* @param methodAnnotationInfo
* The list of {@link AnnotationInfo} objects for any annotations on the method.
* @param modifiers
* The method modifier bits.
* @param typeDescriptorStr
* The internal method type descriptor string.
* @param typeSignatureStr
* The internal method type signature string, or null if none.
* @param parameterNames
* The parameter names.
* @param parameterModifiers
* The parameter modifiers.
* @param parameterAnnotationInfo
* The parameter {@link AnnotationInfo}.
*/
public MethodInfo(final String className, final String methodName,
final List methodAnnotationInfo, final int modifiers, final String typeDescriptorStr,
final String typeSignatureStr, final String[] parameterNames, final int[] parameterModifiers,
final AnnotationInfo[][] parameterAnnotationInfo) {
this.className = className;
this.methodName = methodName;
this.modifiers = modifiers;
this.typeDescriptorStr = typeDescriptorStr;
this.typeSignatureStr = typeSignatureStr;
this.parameterNames = parameterNames;
this.parameterModifiers = parameterModifiers;
this.parameterAnnotationInfo = parameterAnnotationInfo;
this.annotationInfo = methodAnnotationInfo == null || methodAnnotationInfo.isEmpty()
? Collections. emptyList()
: methodAnnotationInfo;
}
// -------------------------------------------------------------------------------------------------------------
/**
* Returns the modifier bits for the method.
*
* @return The modifier bits for the method.
*/
public int getModifiers() {
return modifiers;
}
/**
* Get the method modifiers as a String, e.g. "public static final". For the modifier bits, call
* {@link #getModifiers()}.
*
* @return The modifiers for the method, as a String.
*/
public String getModifiersStr() {
return TypeUtils.modifiersToString(getModifiers(), /* isMethod = */ true);
}
/**
* Get the name of the class this method is part of.
*
* @return The name of the enclosing class.
*/
public String getClassName() {
return className;
}
/**
* Returns the name of the method. Note that constructors are named {@code ""}, and private static class
* initializer blocks are named {@code ""}.
*
* @return The name of the method.
*/
public String getMethodName() {
return methodName;
}
/**
* Returns the low-level internal type descriptor for the method, e.g. {@code "(Ljava/util/List;)V"}. This is
* the internal type descriptor used by the JVM, so does not include type parameters (due to type erasure), and
* does include any synthetic and/or mandated parameters generated by the compiler. See also
* {@link #getTypeDescriptor()}.
*
* @return The internal type descriptor for the method.
*/
public String getTypeDescriptorStr() {
return typeDescriptorStr;
}
/**
* Returns the low-level internal type Signature for the method, e.g.
* {@code "(Ljava/util/List)V"}. This may or may not include synthetic and/or mandated
* parameters, depending on the compiler. May be null, if there is no type signature in the classfile. See also
* {@link #getTypeDescriptorStr()}.
*
* @return The internal type signature for the method, or null if not available.
*/
public String getTypeSignatureStr() {
return typeSignatureStr;
}
/**
* Returns the parsed type descriptor for the method, which will not include type parameters. If you need
* generic type parameters, call getTypeSignature() instead.
*
* @return The parsed type descriptor for the method.
*/
public MethodTypeSignature getTypeDescriptor() {
if (typeDescriptor == null) {
typeDescriptor = MethodTypeSignature.parse(classInfo, typeDescriptorStr);
}
return typeDescriptor;
}
/**
* Returns the parsed type signature for the method, possibly including type parameters. If this returns null,
* indicating that no type signature information is available for this method, call getTypeDescriptor() instead.
*
* @return The parsed type signature for the method, or null if not available.
*/
public MethodTypeSignature getTypeSignature() {
if (typeSignature == null && typeSignatureStr != null) {
typeSignature = MethodTypeSignature.parse(classInfo, typeSignatureStr);
}
return typeSignature;
}
/**
* Returns the parsed type signature for the method, possibly including type parameters. If the parsed type
* signature is null, indicating that no type signature information is available for this method, returns the
* parsed type descriptor instead.
*
* @return The parsed type signature for the method, or if not available, the parsed type descriptor for the
* method.
*/
public MethodTypeSignature getTypeSignatureOrTypeDescriptor() {
final MethodTypeSignature typeSig = getTypeSignature();
if (typeSig != null) {
return typeSig;
} else {
return getTypeDescriptor();
}
}
// -------------------------------------------------------------------------------------------------------------
/**
* Returns true if this method is a constructor. Constructors have the method name {@code
* ""}. This returns false for private static class initializer blocks, which are named
* {@code ""}.
*
* @return True if this method is a constructor.
*/
public boolean isConstructor() {
return "".equals(methodName);
}
/**
* Returns true if this method is public.
*
* @return True if this method is public.
*/
public boolean isPublic() {
return Modifier.isPublic(modifiers);
}
/**
* Returns true if this method is private.
*
* @return True if this method is private.
*/
public boolean isPrivate() {
return Modifier.isPrivate(modifiers);
}
/**
* Returns true if this method is protected.
*
* @return True if this method is protected.
*/
public boolean isProtected() {
return Modifier.isProtected(modifiers);
}
/**
* Returns true if this method is package-private.
*
* @return True if this method is package-private.
*/
public boolean isPackagePrivate() {
return !isPublic() && !isPrivate() && !isProtected();
}
/**
* Returns true if this method is static.
*
* @return True if this method is static.
*/
public boolean isStatic() {
return Modifier.isStatic(modifiers);
}
/**
* Returns true if this method is final.
*
* @return True if this method is final.
*/
public boolean isFinal() {
return Modifier.isFinal(modifiers);
}
/**
* Returns true if this method is synchronized.
*
* @return True if this method is synchronized.
*/
public boolean isSynchronized() {
return Modifier.isSynchronized(modifiers);
}
/**
* Returns true if this method is a bridge method.
*
* @return True if this is a bridge method.
*/
public boolean isBridge() {
// From: http://anonsvn.jboss.org/repos/javassist/trunk/src/main/javassist/bytecode/AccessFlag.java
return (modifiers & 0x0040) != 0;
}
/**
* Returns true if this method is a varargs method.
*
* @return True if this is a varargs method.
*/
public boolean isVarArgs() {
// From: http://anonsvn.jboss.org/repos/javassist/trunk/src/main/javassist/bytecode/AccessFlag.java
return (modifiers & 0x0080) != 0;
}
/**
* Returns true if this method is a native method.
*
* @return True if this method is native.
*/
public boolean isNative() {
return Modifier.isNative(modifiers);
}
// -------------------------------------------------------------------------------------------------------------
private static final String[] EMPTY_STRING_ARRAY = new String[0];
private static final TypeParameter[] EMPTY_TYPE_PARAMETER_ARRAY = new TypeParameter[0];
private static final ClassRefOrTypeVariableSignature[] EMPTY_CLASS_TYPE_OR_TYPE_VARIABLE_SIGNATURE_ARRAY //
= new ClassRefOrTypeVariableSignature[0];
private static final Class[] EMPTY_CLASS_REF_ARRAY = new Class[0];
private static final AnnotationInfo[] EMPTY_ANNOTATION_INFO_ARRAY = new AnnotationInfo[0];
private static String[] toStringArray(final List list) {
if (list.size() == 0) {
return EMPTY_STRING_ARRAY;
} else {
final String[] stringArray = new String[list.size()];
for (int i = 0; i < list.size(); i++) {
stringArray[i] = list.get(i).toString();
}
return stringArray;
}
}
private static Class[] toClassRefs(final List typeDescriptors,
final ScanResult scanResult) {
if (typeDescriptors.size() == 0) {
return EMPTY_CLASS_REF_ARRAY;
} else {
final Class[] classRefArray = new Class[typeDescriptors.size()];
for (int i = 0; i < typeDescriptors.size(); i++) {
classRefArray[i] = typeDescriptors.get(i).instantiate(scanResult);
}
return classRefArray;
}
}
private static Class[] toClassRefs(final TypeSignature[] typeDescriptors, final ScanResult scanResult) {
if (typeDescriptors.length == 0) {
return EMPTY_CLASS_REF_ARRAY;
} else {
final Class[] classRefArray = new Class[typeDescriptors.length];
for (int i = 0; i < typeDescriptors.length; i++) {
classRefArray[i] = typeDescriptors[i].instantiate(scanResult);
}
return classRefArray;
}
}
private static ClassRefOrTypeVariableSignature[] toTypeOrTypeVariableSignatureArray(
final List typeSignatures) {
if (typeSignatures.size() == 0) {
return EMPTY_CLASS_TYPE_OR_TYPE_VARIABLE_SIGNATURE_ARRAY;
} else {
return typeSignatures.toArray(new ClassRefOrTypeVariableSignature[typeSignatures.size()]);
}
}
private static TypeParameter[] toTypeParameterArray(final List typeParameters) {
if (typeParameters.size() == 0) {
return EMPTY_TYPE_PARAMETER_ARRAY;
} else {
return typeParameters.toArray(new TypeParameter[typeParameters.size()]);
}
}
// -------------------------------------------------------------------------------------------------------------
/**
* Get the available information on method parameters.
*
* @return The {@link MethodParameterInfo} objects for the method parameters, one per parameter.
*/
public MethodParameterInfo[] getParameterInfo() {
if (methodParameterInfo == null) {
// Get params from the type descriptor, and from the type signature if available
final List paramTypeDescriptors = getTypeDescriptor().getParameterTypeSignatures();
final List paramTypeSignatures = getTypeSignature() != null
? getTypeSignature().getParameterTypeSignatures()
: null;
// Figure out the number of params in the alignment (should be num params in type descriptor)
final int numParams = paramTypeDescriptors.size();
if (paramTypeSignatures != null && paramTypeSignatures.size() > paramTypeDescriptors.size()) {
// Should not happen
throw new RuntimeException(
"typeSignatureParamTypes.size() > typeDescriptorParamTypes.size() for method " + className
+ "." + methodName);
}
// Figure out number of other fields that need alignment, and check length for consistency
final int otherParamMax = Math.max(parameterNames == null ? 0 : parameterNames.length,
Math.max(parameterModifiers == null ? 0 : parameterModifiers.length,
parameterAnnotationInfo == null ? 0 : parameterAnnotationInfo.length));
if (otherParamMax > numParams) {
// Should not happen
throw new RuntimeException("Type descriptor for method " + className + "." + methodName
+ " has insufficient parameters");
}
// Kotlin is very inconsistent about the arity of each of the parameter metadata types, see:
// https://github.com/lukehutch/fast-classpath-scanner/issues/175#issuecomment-363031510
// As a workaround, we assume that any synthetic / mandated parameters must come first in the
// parameter list, when the arities don't match, and we right-align the metadata fields.
// This is probably the safest assumption across JVM languages, even though this convention
// is by no means the only possibility. (Unfortunately we can't just rely on the modifier
// bits to find synthetic / mandated parameters, because these bits are not always available,
// and even when they are, they don't always give the right alignment, at least for Kotlin-
// generated code).
String[] paramNamesAligned = null;
if (parameterNames != null && numParams > 0) {
if (parameterNames.length == numParams) {
// No alignment necessary
paramNamesAligned = parameterNames;
} else {
// Right-align when not the right length
paramNamesAligned = new String[numParams];
for (int i = 0, lenDiff = numParams - parameterNames.length; i < parameterNames.length; i++) {
paramNamesAligned[lenDiff + i] = parameterNames[i];
}
}
}
int[] paramModifiersAligned = null;
if (parameterModifiers != null && numParams > 0) {
if (parameterModifiers.length == numParams) {
// No alignment necessary
paramModifiersAligned = parameterModifiers;
} else {
// Right-align when not the right length
paramModifiersAligned = new int[numParams];
for (int i = 0, lenDiff = numParams
- parameterModifiers.length; i < parameterModifiers.length; i++) {
paramModifiersAligned[lenDiff + i] = parameterModifiers[i];
}
}
}
AnnotationInfo[][] paramAnnotationInfoAligned = null;
if (parameterAnnotationInfo != null && numParams > 0) {
if (parameterAnnotationInfo.length == numParams) {
// No alignment necessary
paramAnnotationInfoAligned = parameterAnnotationInfo;
} else {
// Right-align when not the right length
paramAnnotationInfoAligned = new AnnotationInfo[numParams][];
for (int i = 0, lenDiff = numParams
- parameterAnnotationInfo.length; i < parameterAnnotationInfo.length; i++) {
paramAnnotationInfoAligned[lenDiff + i] = parameterAnnotationInfo[i];
}
}
}
List paramTypeSignaturesAligned = null;
if (paramTypeSignatures != null && numParams > 0) {
if (paramTypeSignatures.size() == paramTypeDescriptors.size()) {
// No alignment necessary
paramTypeSignaturesAligned = paramTypeSignatures;
} else {
// Right-align when not the right length
paramTypeSignaturesAligned = new ArrayList<>(numParams);
for (int i = 0, n = numParams - paramTypeSignatures.size(); i < n; i++) {
// Left-pad with nulls
paramTypeSignaturesAligned.add(null);
}
paramTypeSignaturesAligned.addAll(paramTypeSignatures);
}
}
// Generate MethodParameterInfo entries
methodParameterInfo = new MethodParameterInfo[numParams];
for (int i = 0; i < numParams; i++) {
methodParameterInfo[i] = new MethodParameterInfo(
paramAnnotationInfoAligned == null ? null : paramAnnotationInfoAligned[i],
paramModifiersAligned == null ? 0 : paramModifiersAligned[i], paramTypeDescriptors.get(i),
paramTypeSignaturesAligned == null ? null : paramTypeSignaturesAligned.get(i),
paramNamesAligned == null ? null : paramNamesAligned[i]);
}
}
return methodParameterInfo;
}
/**
* Get the number of parameters of the method.
*
* @return The number of method parameters, i.e. {@code getParameterInfo().size()}.
*/
public int getNumParameters() {
// return getTypeSignature().getParameterTypeSignatures().size();
return getParameterInfo().length;
}
/**
* Returns the parameter types for the method. If the method has no parameters, returns a zero-sized array.
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
*
* Note that this calls Class.forName() on the parameter types, which will cause the class to be loaded, and
* possibly initialized. If the class is initialized, this can trigger side effects.
*
* @return The list of {@code Class} references for the method parameter types.
* @throws IllegalArgumentException
* if the parameter types of the method could not be loaded.
*/
public Class[] getParameterTypes() throws IllegalArgumentException {
// Can't instantiate type signatures, since they may have type variables.
// Therefore, we use type descriptors, which are the result of type erasure.
final MethodParameterInfo[] parameterInfo = getParameterInfo();
final TypeSignature[] paramTypeDescriptors = new TypeSignature[parameterInfo.length];
for (int i = 0; i < parameterInfo.length; i++) {
final MethodParameterInfo paramInfo = parameterInfo[i];
final TypeSignature typeDesc = paramInfo.getTypeDescriptor();
paramTypeDescriptors[i] = typeDesc;
}
return toClassRefs(paramTypeDescriptors, scanResult);
}
/**
* Returns the parameter type signatures for the method. If the method has no parameters, returns a zero-sized
* array.
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
* @return The method parameter types, as an array of parsed type signatures.
*/
public TypeSignature[] getParameterTypeSignatures() {
final MethodParameterInfo[] parameterInfo = getParameterInfo();
final TypeSignature[] paramTypeSignaturesOrTypeDescriptors = new TypeSignature[parameterInfo.length];
for (int i = 0; i < parameterInfo.length; i++) {
final MethodParameterInfo paramInfo = parameterInfo[i];
final TypeSignature typeSig = paramInfo.getTypeSignature();
paramTypeSignaturesOrTypeDescriptors[i] = typeSig == null ? paramInfo.getTypeDescriptor() : typeSig;
}
return paramTypeSignaturesOrTypeDescriptors;
}
/**
* Returns the method parameter names, if available (only available in classfiles compiled in JDK8 or above
* using the -parameters commandline switch), otherwise returns null if the parameter names are not known. Note
* that even when a non-null String array is returned, one or more individual array elements may be null,
* representing unnamed parameters.
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
* @return The method parameter names, as an array of Strings, or null if parameter names are not available.
*/
public String[] getParameterNames() {
final MethodParameterInfo[] parameterInfo = getParameterInfo();
boolean hasNames = false;
for (int i = 0; i < parameterInfo.length; i++) {
if (parameterInfo[i].getName() != null) {
hasNames = true;
break;
}
}
if (!hasNames) {
// No name info
return null;
}
final String[] paramNames = new String[parameterInfo.length];
for (int i = 0; i < parameterInfo.length; i++) {
paramNames[i] = parameterInfo[i].getName();
}
return paramNames;
}
/**
* Returns the parameter modifiers, if available (only available in classfiles compiled in JDK8 or above using
* the -parameters commandline switch, or code compiled with Kotlin or some other language), otherwise returns
* null if the parameter modifiers are not known.
*
*
* Flag bits:
*
*
* - 0x0010 (ACC_FINAL): Indicates that the formal parameter was declared final.
*
- 0x1000 (ACC_SYNTHETIC): Indicates that the formal parameter was not explicitly or implicitly declared in
* source code, according to the specification of the language in which the source code was written (JLS §13.1).
* (The formal parameter is an implementation artifact of the compiler which produced this class file.)
*
- 0x8000 (ACC_MANDATED): Indicates that the formal parameter was implicitly declared in source code,
* according to the specification of the language in which the source code was written (JLS §13.1). (The formal
* parameter is mandated by a language specification, so all compilers for the language must emit it.)
*
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
* @return The method parameter modifiers, as an array of integers, or null if parameter modifiers are not
* available.
*/
public int[] getParameterModifiers() {
final MethodParameterInfo[] parameterInfo = getParameterInfo();
boolean hasNames = false;
for (int i = 0; i < parameterInfo.length; i++) {
if (parameterInfo[i].getName() != null) {
hasNames = true;
break;
}
}
if (!hasNames) {
// There is no modifier info if there is also no name info
// (this is needed to distinguish between no info, and all-zero modifiers)
return null;
}
final int[] paramMods = new int[parameterInfo.length];
for (int i = 0; i < parameterInfo.length; i++) {
paramMods[i] = parameterInfo[i].getModifiers();
}
return paramMods;
}
/**
* Returns the parameter modifiers as a string (e.g. ["final", ""], if available (only available in classfiles
* compiled in JDK8 or above using the -parameters commandline switch), otherwise returns null if the parameter
* modifiers are not known.
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
* @return The method parameter modifiers, in string representation, as an array of Strings, or null if the
* parameter modifiers are not available.
*/
public String[] getParameterModifierStrs() {
final int[] paramModifiers = getParameterModifiers();
if (paramModifiers == null) {
return null;
}
final String[] paramModifierStrs = new String[paramModifiers.length];
for (int i = 0; i < paramModifiers.length; i++) {
paramModifierStrs[i] = TypeUtils.modifiersToString(paramModifiers[i], /* isMethod = */ false);
}
return paramModifierStrs;
}
/**
* Returns the annotations on each method parameter (along with any annotation parameters, wrapped in
* AnnotationInfo objects) if any parameters have annotations, else returns null.
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
* @return The method parameter annotations, as an array of {@link AnnotationInfo} objects, or null if no
* parameter annotations are present.
*/
public AnnotationInfo[][] getParameterAnnotationInfo() {
final MethodParameterInfo[] parameterInfo = getParameterInfo();
boolean hasAnnotations = false;
for (int i = 0; i < parameterInfo.length; i++) {
final AnnotationInfo[] annInfo = parameterInfo[i].getAnnotationInfo();
if (annInfo != null && annInfo.length > 0) {
hasAnnotations = true;
break;
}
}
if (!hasAnnotations) {
return null;
}
final AnnotationInfo[][] annotationInfo = new AnnotationInfo[parameterInfo.length][];
for (int i = 0; i < parameterInfo.length; i++) {
annotationInfo[i] = parameterInfo[i].getAnnotationInfo();
if (annotationInfo[i] == null) {
annotationInfo[i] = EMPTY_ANNOTATION_INFO_ARRAY;
}
}
return annotationInfo;
}
/**
* Returns the unique annotation names for annotations on each method parameter, if any parameters have
* annotations, else returns null.
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
* @return The method parameter annotation names, as an array of Strings, or null if no parameter annotations
* are presest.
*/
public String[][] getParameterAnnotationNames() {
final AnnotationInfo[][] paramAnnotationInfo = getParameterAnnotationInfo();
if (paramAnnotationInfo == null) {
return null;
}
final String[][] paramAnnotationNames = new String[paramAnnotationInfo.length][];
for (int i = 0; i < paramAnnotationInfo.length; i++) {
paramAnnotationNames[i] = AnnotationInfo.getUniqueAnnotationNamesSorted(paramAnnotationInfo[i]);
}
return paramAnnotationNames;
}
/**
* Returns the unique annotation types for annotations on each method parameter, if any parameters have
* annotations, else returns null.
*
* Note that it is always faster to call {@link #getParameterInfo()} and get the parameter information from the
* returned list of {@link MethodParameterInfo} objects, since this method calls that to compile its results.
*
* @return The method parameter annotation types, as an array of Strings, or null if no parameter annotations
* are present.
*/
public Class[][] getParameterAnnotationTypes() {
final String[][] paramAnnotationNames = getParameterAnnotationNames();
if (paramAnnotationNames == null) {
return null;
}
final Class[][] parameterAnnotationTypes = new Class[paramAnnotationNames.length][];
for (int i = 0; i < paramAnnotationNames.length; i++) {
parameterAnnotationTypes[i] = new Class[paramAnnotationNames[i].length];
for (int j = 0; j < paramAnnotationNames[i].length; j++) {
parameterAnnotationTypes[i][j] = scanResult.classNameToClassRef(paramAnnotationNames[i][j]);
}
}
return parameterAnnotationTypes;
}
// -------------------------------------------------------------------------------------------------------------
/**
* Returns the result type signature for the method (with type parameters, if present). If this is a
* constructor, the returned type will be void.
*
* @return The type signature of the result of this method, or null if type signature information is not
* available.
*/
public TypeSignature getResultTypeSignature() {
final MethodTypeSignature ts = getTypeSignature();
if (ts == null) {
return null;
} else {
return ts.getResultType();
}
}
/**
* Returns the result type descriptor for the method (without any type parameters). If this is a constructor,
* the returned type will be void.
*
* @return The type descriptor of the result of this method.
*/
public TypeSignature getResultTypeDescriptor() {
return getTypeDescriptor().getResultType();
}
/**
* Returns the return type for the method as a Class reference. If this is a constructor, the return type will
* be void.class. Note that this calls {@code Class.forName()} on the return type, which will cause the class to
* be loaded, and possibly initialized. If the class is initialized, this can trigger side effects.
*
* @return The result type of the method as a {@code Class} reference.
* @throws IllegalArgumentException
* if the return type for the method could not be loaded.
*/
public Class getResultType() throws IllegalArgumentException {
return getResultTypeDescriptor().instantiate(scanResult);
}
// -------------------------------------------------------------------------------------------------------------
/**
* Returns the types of exceptions the method may throw, in string representation, e.g. {@code
* ["com.abc.BadException", ""]}.
*
* @return The types of exceptions the method may throw. If the method throws no exceptions, returns a
* zero-sized array.
*/
public ClassRefOrTypeVariableSignature[] getThrowsTypeSignatures() {
return toTypeOrTypeVariableSignatureArray(getTypeSignature().getThrowsSignatures());
}
/**
* Returns the types of exceptions the method may throw.
*
* @return The types of exceptions the method may throw. If the method throws no exceptions, returns a
* zero-sized array.
*/
public Class[] getThrowsTypes() {
return toClassRefs(getTypeSignature().getThrowsSignatures(), scanResult);
}
/**
* Returns the types of exceptions the method may throw, in string representation, e.g. {@code
* ["com.abc.BadException", ""]}.
*
* @return The types of exceptions the method may throw, as Strings. If the method throws no exceptions, returns
* a zero-sized array.
*/
public String[] getThrowsTypeStrs() {
return toStringArray(getTypeSignature().getThrowsSignatures());
}
/**
* Returns the type parameters of the method.
*
* @return The type parameters of the method. If the method has no type parameters, returns a zero-sized array.
*/
public TypeParameter[] getTypeParameters() {
return toTypeParameterArray(getTypeSignature().getTypeParameters());
}
/**
* Returns the type parameters of the method, in string representation, e.g. {@code ["",
* ""]}.
*
* @return The type parameters of the method, in string representation, e.g. {@code ["",
* ""]}. If the method has no type parameters, returns a zero-sized array.
*/
public String[] getTypeParameterStrs() {
return toStringArray(getTypeSignature().getTypeParameters());
}
// -------------------------------------------------------------------------------------------------------------
/**
* Returns the names of annotations on the method.
*
* @return The names of annotations on this method, or the empty list if none.
*/
public List getAnnotationNames() {
return Arrays.asList(AnnotationInfo.getUniqueAnnotationNamesSorted(annotationInfo));
}
/**
* Returns a list of {@code Class} references for the annotations on this method. Note that this calls
* Class.forName() on the annotation types, which will cause each annotation class to be loaded.
*
* @return a list of {@code Class} references for the annotations on this method, or the empty list if none.
* @throws IllegalArgumentException
* if the annotation type could not be loaded.
*/
public List> getAnnotationTypes() throws IllegalArgumentException {
if (annotationInfo == null || annotationInfo.isEmpty()) {
return Collections.> emptyList();
} else {
final List> annotationClassRefs = new ArrayList<>();
for (final String annotationName : getAnnotationNames()) {
annotationClassRefs.add(scanResult.classNameToClassRef(annotationName));
}
return annotationClassRefs;
}
}
/**
* Get a list of annotations on this method, along with any annotation parameter values.
*
* @return a list of annotations on this method, along with any annotation parameter values, wrapped in
* {@link AnnotationInfo} objects, or the empty list if none.
*/
public List getAnnotationInfo() {
return annotationInfo == null ? Collections. emptyList() : annotationInfo;
}
/** Test class name, method name and type descriptor for equals(). */
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (this.getClass() != obj.getClass()) {
return false;
}
final MethodInfo other = (MethodInfo) obj;
return className.equals(other.className) && typeDescriptorStr.equals(other.typeDescriptorStr)
&& methodName.equals(other.methodName);
}
// -------------------------------------------------------------------------------------------------------------
/** Use hash code of class name, method name and type descriptor. */
@Override
public int hashCode() {
return methodName.hashCode() + typeDescriptorStr.hashCode() * 11 + className.hashCode() * 57;
}
/** Sort in order of class name, method name, then type descriptor. */
@Override
public int compareTo(final MethodInfo other) {
final int diff0 = className.compareTo(other.className);
if (diff0 != 0) {
return diff0;
}
final int diff1 = methodName.compareTo(other.methodName);
if (diff1 != 0) {
return diff1;
}
return typeDescriptorStr.compareTo(other.typeDescriptorStr);
}
/**
* Get a string representation of the method. Note that constructors are named {@code ""}, and private
* static class initializer blocks are named {@code ""}.
*/
@Override
public String toString() {
final MethodTypeSignature methodType = getTypeSignatureOrTypeDescriptor();
final StringBuilder buf = new StringBuilder();
if (annotationInfo != null) {
for (final AnnotationInfo annotation : annotationInfo) {
if (buf.length() > 0) {
buf.append(' ');
}
annotation.toString(buf);
}
}
if (modifiers != 0) {
if (buf.length() > 0) {
buf.append(' ');
}
TypeUtils.modifiersToString(modifiers, /* isMethod = */ true, buf);
}
final List typeParameters = methodType.getTypeParameters();
if (!typeParameters.isEmpty()) {
if (buf.length() > 0) {
buf.append(' ');
}
buf.append('<');
for (int i = 0; i < typeParameters.size(); i++) {
if (i > 0) {
buf.append(", ");
}
final String typeParamStr = typeParameters.get(i).toString();
buf.append(typeParamStr);
}
buf.append('>');
}
if (!isConstructor()) {
if (buf.length() > 0) {
buf.append(' ');
}
buf.append(methodType.getResultType().toString());
}
buf.append(' ');
if (methodName != null) {
buf.append(methodName);
}
// If at least one param is named, then use placeholder names for unnamed params,
// otherwise don't show names for any params
final MethodParameterInfo[] allParamInfo = getParameterInfo();
boolean hasParamNames = false;
for (int i = 0, numParams = allParamInfo.length; i < numParams; i++) {
if (allParamInfo[i].getName() != null) {
hasParamNames = true;
break;
}
}
buf.append('(');
for (int i = 0, numParams = allParamInfo.length; i < numParams; i++) {
final MethodParameterInfo paramInfo = allParamInfo[i];
if (i > 0) {
buf.append(", ");
}
final AnnotationInfo[] annInfo = paramInfo.getAnnotationInfo();
if (annInfo != null) {
for (int j = 0; j < annInfo.length; j++) {
annInfo[j].toString(buf);
buf.append(' ');
}
}
final int flag = paramInfo.getModifiers();
if ((flag & Modifier.FINAL) != 0) {
buf.append("final ");
}
if ((flag & TypeUtils.MODIFIER_SYNTHETIC) != 0) {
buf.append("synthetic ");
}
if ((flag & TypeUtils.MODIFIER_MANDATED) != 0) {
buf.append("mandated ");
}
final TypeSignature paramType = paramInfo.getTypeSignatureOrTypeDescriptor();
if (isVarArgs() && i == numParams - 1) {
// Show varargs params correctly
if (!(paramType instanceof ArrayTypeSignature)) {
throw new IllegalArgumentException(
"Got non-array type for last parameter of varargs method " + methodName);
}
final ArrayTypeSignature arrayType = (ArrayTypeSignature) paramType;
if (arrayType.getNumArrayDims() == 0) {
throw new IllegalArgumentException(
"Got a zero-dimension array type for last parameter of varargs method " + methodName);
}
// Replace last "[]" with "..."
buf.append(
new ArrayTypeSignature(arrayType.getElementTypeSignature(), arrayType.getNumArrayDims() - 1)
.toString());
buf.append("...");
} else {
buf.append(paramType.toString());
}
if (hasParamNames) {
final String paramName = paramInfo.getName();
if (paramName != null) {
buf.append(' ');
buf.append(paramName == null ? "_unnamed_param_" + i : paramName);
}
}
}
buf.append(')');
if (!methodType.getThrowsSignatures().isEmpty()) {
buf.append(" throws ");
for (int i = 0; i < methodType.getThrowsSignatures().size(); i++) {
if (i > 0) {
buf.append(", ");
}
buf.append(methodType.getThrowsSignatures().get(i).toString());
}
}
return buf.toString();
}
}