/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.juneau.commons.reflect;

import static org.apache.juneau.commons.reflect.ClassArrayFormat.*;
import static org.apache.juneau.commons.reflect.ClassNameFormat.*;
import static org.apache.juneau.commons.utils.AssertionUtils.*;
import static org.apache.juneau.commons.utils.CollectionUtils.*;
import static org.apache.juneau.commons.utils.Utils.*;
import static java.util.stream.Collectors.*;

import java.lang.annotation.*;
import java.lang.reflect.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

import org.apache.juneau.commons.utils.*;

/**
 * Abstract base class containing common functionality for {@link ConstructorInfo} and {@link MethodInfo}.
 *
 * <p>
 * This class provides shared functionality for both constructors and methods, which are both types of
 * {@link Executable} in Java. It extends {@link AccessibleInfo} to provide {@link AccessibleObject}
 * functionality for accessing private methods and constructors.
 *
 * <h5 class='section'>Features:</h5>
 * <ul class='spaced-list'>
 *    <li>Parameter introspection - access method/constructor parameters
 *    <li>Exception handling - get declared exceptions
 *    <li>Annotation support - get annotations declared on the executable
 *    <li>Name formatting - get short and fully qualified names
 *    <li>Parameter matching - match parameters by type (strict and lenient)
 *    <li>Accessibility control - make private executables accessible
 * </ul>
 *
 * <h5 class='section'>Use Cases:</h5>
 * <ul class='spaced-list'>
 *    <li>Working with both methods and constructors in a unified way
 *    <li>Finding methods/constructors that match specific parameter types
 *    <li>Introspecting parameter and exception information
 *    <li>Building frameworks that need to analyze executable signatures
 * </ul>
 *
 * <h5 class='section'>Usage:</h5>
 * <p class='bjava'>
 *    <jc>// Get ExecutableInfo (could be MethodInfo or ConstructorInfo)</jc>
 *    MethodInfo <jv>mi</jv> = ...;
 *    ExecutableInfo <jv>ei</jv> = <jv>mi</jv>;  <jc>// MethodInfo extends ExecutableInfo</jc>
 *
 *    <jc>// Get parameters</jc>
 *    List&lt;ParameterInfo&gt; <jv>params</jv> = <jv>ei</jv>.getParameters();
 *
 *    <jc>// Get exceptions</jc>
 *    List&lt;ClassInfo&gt; <jv>exceptions</jv> = <jv>ei</jv>.getExceptions();
 *
 *    <jc>// Check parameter matching</jc>
 *    <jk>boolean</jk> <jv>matches</jv> = <jv>ei</jv>.parameterMatches(String.<jk>class</jk>, Integer.<jk>class</jk>);
 * </p>
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='jc'>{@link MethodInfo} - Method introspection
 *    <li class='jc'>{@link ConstructorInfo} - Constructor introspection
 *    <li class='jc'>{@link ParameterInfo} - Parameter introspection
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JuneauCommonsReflection">Reflection Package</a>
 * </ul>
 */
public abstract class ExecutableInfo extends AccessibleInfo {

   protected final ClassInfo declaringClass;
   private final Executable inner;
   private final boolean isConstructor;

   private final Supplier<List<ParameterInfo>> parameters;  // All parameters of this executable.
   private final Supplier<List<ClassInfo>> parameterTypes;  // All parameter types of this executable.
   private final Supplier<List<ClassInfo>> exceptions;  // All exceptions declared by this executable.
   private final Supplier<List<AnnotationInfo<Annotation>>> declaredAnnotations;  // All annotations declared directly on this executable.
   private final Supplier<String> shortName;  // Short name (method/constructor name with parameters).
   private final Supplier<String> fullName;  // Fully qualified name (declaring-class.method-name with parameters).

   /**
    * Constructor.
    *
    * <p>
    * Creates a new ExecutableInfo wrapper for the specified executable (method or constructor).
    * This constructor is protected and should not be called directly. Use the constructors
    * of {@link MethodInfo} or {@link ConstructorInfo} instead.
    *
    * @param declaringClass The ClassInfo for the class that declares this method or constructor.
    * @param inner The constructor or method that this info represents. Must not be <jk>null</jk>.
    */
   protected ExecutableInfo(ClassInfo declaringClass, Executable inner) {
      super(inner, assertArgNotNull("inner", inner).getModifiers());
      this.declaringClass = declaringClass;
      this.inner = inner;
      this.isConstructor = inner instanceof Constructor;
      this.parameters = mem(this::findParameters);
      this.parameterTypes = mem(() -> getParameters().stream().map(ParameterInfo::getParameterType).toList());
      this.exceptions = mem(() -> stream(inner.getExceptionTypes()).map(ClassInfo::of).map(ClassInfo.class::cast).toList());
      this.declaredAnnotations = mem(() -> stream(inner.getDeclaredAnnotations()).flatMap(a -> AnnotationUtils.streamRepeated(a)).map(a -> ai((Annotatable)this, a)).toList());
      this.shortName = mem(() -> f("{0}({1})", getSimpleName(), getParameters().stream().map(p -> p.getParameterType().getNameSimple()).collect(joining(","))));
      this.fullName = mem(this::findFullName);
   }

   /**
    * Attempts to call <code>x.setAccessible(<jk>true</jk>)</code> and quietly ignores security exceptions.
    *
    * @return This object.
    */
   public ExecutableInfo accessible() {
      setAccessible();
      return this;
   }

   /**
    * Returns <jk>true</jk> if this executable can accept the specified arguments in the specified order.
    *
    * <p>
    * This method checks if the provided arguments are compatible with the executable's parameter types
    * in exact order, using {@link Class#isInstance(Object)} for type checking.
    *
    * <p>
    * <strong>Important:</strong> For non-static inner class constructors, the first parameter is the
    * implicit outer class instance (e.g., {@code Outer.this}). This method checks against the
    * <em>actual</em> parameters including this implicit parameter.
    *
    * <h5 class='section'>Examples:</h5>
    * <p class='bjava'>
    *    <jc>// Regular method</jc>
    *    <jk>public void</jk> foo(String <jv>s</jv>, Integer <jv>i</jv>);
    *    <jv>methodInfo</jv>.canAccept(<js>"hello"</js>, 42);  <jc>// true</jc>
    *
    *    <jc>// Non-static inner class constructor</jc>
    *    <jk>class</jk> Outer {
    *       <jk>class</jk> Inner {
    *          Inner(String <jv>s</jv>) {}
    *       }
    *    }
    *    <jc>// Constructor actually has signature: Inner(Outer this$0, String s)</jc>
    *    Outer <jv>outer</jv> = <jk>new</jk> Outer();
    *    <jv>constructorInfo</jv>.canAccept(<js>"hello"</js>);  <jc>// false - missing outer instance</jc>
    *    <jv>constructorInfo</jv>.canAccept(<jv>outer</jv>, <js>"hello"</js>);  <jc>// true</jc>
    * </p>
    *
    * @param args The arguments to check.
    * @return <jk>true</jk> if this executable can accept the specified arguments in the specified order.
    */
   public final boolean canAccept(Object...args) {
      Class<?>[] pt = inner.getParameterTypes();
      if (pt.length != args.length)
         return false;
      for (var i = 0; i < pt.length; i++)
         if (! pt[i].isInstance(args[i]))
            return false;
      return true;
   }

   /**
    * Returns an array of {@link AnnotatedType} objects that represent the use of types to specify the declared exceptions.
    *
    * <p>
    * The order of the objects corresponds to the order of the exception types in the executable declaration.
    *
    * <p>
    * Same as calling {@link Executable#getAnnotatedExceptionTypes()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Get annotated exception types from method: void myMethod() throws @NotNull IOException</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"myMethod"</js>);
    *    AnnotatedType[] <jv>exTypes</jv> = <jv>mi</jv>.getAnnotatedExceptionTypes();
    * </p>
    *
    * @return An array of {@link AnnotatedType} objects, or an empty array if the executable declares no exceptions.
    * @see Executable#getAnnotatedExceptionTypes()
    */
   public final AnnotatedType[] getAnnotatedExceptionTypes() { return inner.getAnnotatedExceptionTypes(); }

   /**
    * Returns an array of {@link AnnotatedType} objects that represent the use of types to specify formal parameter types.
    *
    * <p>
    * The order of the objects corresponds to the order of the formal parameter types in the executable declaration.
    *
    * <p>
    * Same as calling {@link Executable#getAnnotatedParameterTypes()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Get annotated parameter types from method: void myMethod(@NotNull String s, @Range(min=0) int i)</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"myMethod"</js>, String.<jk>class</jk>, <jk>int</jk>.<jk>class</jk>);
    *    AnnotatedType[] <jv>paramTypes</jv> = <jv>mi</jv>.getAnnotatedParameterTypes();
    * </p>
    *
    * @return An array of {@link AnnotatedType} objects, or an empty array if the executable has no parameters.
    * @see Executable#getAnnotatedParameterTypes()
    */
   public final AnnotatedType[] getAnnotatedParameterTypes() { return inner.getAnnotatedParameterTypes(); }

   /**
    * Returns an {@link AnnotatedType} object that represents the use of a type to specify the receiver type of the method/constructor.
    *
    * <p>
    * Returns <jk>null</jk> if this executable object represents a top-level type or static member.
    *
    * <p>
    * Same as calling {@link Executable#getAnnotatedReceiverType()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Get annotated receiver type from method: void myMethod(@MyAnnotation MyClass this)</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"myMethod"</js>);
    *    AnnotatedType <jv>receiverType</jv> = <jv>mi</jv>.getAnnotatedReceiverType();
    * </p>
    *
    * @return An {@link AnnotatedType} object representing the receiver type, or <jk>null</jk> if not applicable.
    * @see Executable#getAnnotatedReceiverType()
    */
   public final AnnotatedType getAnnotatedReceiverType() { return inner.getAnnotatedReceiverType(); }

   /**
    * Returns the declared annotations on this executable.
    *
    * <p>
    * <b>Note on Repeatable Annotations:</b>
    * Repeatable annotations (those marked with {@link java.lang.annotation.Repeatable @Repeatable}) are automatically
    * expanded into their individual annotation instances. For example, if a method has multiple {@code @Bean} annotations,
    * this method returns each {@code @Bean} annotation separately, rather than the container annotation.
    *
    * @return
    *    The declared annotations on this executable as {@link AnnotationInfo} objects.
    *    <br>Repeatable annotations are expanded into individual instances.
    */
   public final List<AnnotationInfo<Annotation>> getDeclaredAnnotations() { return declaredAnnotations.get(); }

   /**
    * Returns the declared annotations of the specified type on this executable.
    *
    * @param <A> The annotation type.
    * @param type The annotation type.
    * @return A stream of matching annotations.
    */
   @SuppressWarnings("unchecked")
   public final <A extends Annotation> Stream<AnnotationInfo<A>> getDeclaredAnnotations(Class<A> type) {
      assertArgNotNull("type", type);
      // @formatter:off
      return declaredAnnotations.get().stream()
         .filter(x -> type.isInstance(x.inner()))
         .map(x -> (AnnotationInfo<A>)x);
      // @formatter:on
   }

   /**
    * Returns metadata about the class that declared this method or constructor.
    *
    * @return Metadata about the class that declared this method or constructor.
    */
   public final ClassInfo getDeclaringClass() { return declaringClass; }

   /**
    * Returns the exception types on this executable.
    *
    * @return The exception types on this executable.
    */
   public final List<ClassInfo> getExceptionTypes() { return exceptions.get(); }

   /**
    * Returns the full name of this executable.
    *
    * <h5 class='section'>Examples:</h5>
    * <ul>
    *    <li><js>"com.foo.MyClass.get(java.util.String)"</js> - Method.
    *    <li><js>"com.foo.MyClass(java.util.String)"</js> - Constructor.
    * </ul>
    *
    * @return The underlying executable name.
    */
   public final String getFullName() { return fullName.get(); }

   /**
    * Returns parameter information at the specified index.
    *
    * @param index The parameter index.
    * @return The parameter information, never <jk>null</jk>.
    */
   public final ParameterInfo getParameter(int index) {
      checkIndex(index);
      return getParameters().get(index);
   }

   /**
    * Returns the number of parameters in this executable.
    *
    * <p>
    * Same as calling {@link Executable#getParameterCount()}.
    *
    * @return The number of parameters in this executable.
    */
   public final int getParameterCount() { return inner.getParameterCount(); }

   /**
    * Returns the parameters defined on this executable.
    *
    * <p>
    * Same as calling {@link Executable#getParameters()} but wraps the results
    *
    * @return An array of parameter information, never <jk>null</jk>.
    */
   public final List<ParameterInfo> getParameters() { return parameters.get(); }

   /**
    * Returns the parameter types for this executable.
    *
    * <p>
    * This is a convenience method that extracts the parameter types from {@link #getParameters()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Get parameter types: void myMethod(String s, int i)</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"myMethod"</js>, String.<jk>class</jk>, <jk>int</jk>.<jk>class</jk>);
    *    List&lt;ClassInfo&gt; <jv>paramTypes</jv> = <jv>mi</jv>.getParameterTypes();
    *    <jc>// paramTypes contains ClassInfo for String and int</jc>
    * </p>
    *
    * @return A list of parameter types, never <jk>null</jk>.
    */
   public final List<ClassInfo> getParameterTypes() {
      return parameterTypes.get();
   }

   /**
    * Returns the short name of this executable.
    *
    * <h5 class='section'>Examples:</h5>
    * <ul>
    *    <li><js>"MyClass.get(String)"</js> - Method.
    *    <li><js>"MyClass(String)"</js> - Constructor.
    * </ul>
    *
    * @return The underlying executable name.
    */
   public final String getShortName() { return shortName.get(); }

   /**
    * Returns the simple name of the underlying method.
    *
    * @return The simple name of the underlying method;
    */
   public final String getSimpleName() { return isConstructor ? cns(inner.getDeclaringClass()) : inner.getName(); }

   /**
    * Returns an array of {@link TypeVariable} objects that represent the type variables declared by the generic declaration.
    *
    * <p>
    * Returns an empty array if the generic declaration declares no type variables.
    *
    * <p>
    * Same as calling {@link Executable#getTypeParameters()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Get type parameters from method: &lt;T extends Number&gt; void myMethod(T value)</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"myMethod"</js>, Number.<jk>class</jk>);
    *    TypeVariable&lt;?&gt;[] <jv>typeParams</jv> = <jv>mi</jv>.getTypeParameters();
    *    <jc>// typeParams[0].getName() returns "T"</jc>
    * </p>
    *
    * @return An array of {@link TypeVariable} objects, or an empty array if none.
    * @see Executable#getTypeParameters()
    */
   public final TypeVariable<?>[] getTypeParameters() { return inner.getTypeParameters(); }

   /**
    * Returns <jk>true</jk> if this executable has the specified annotation.
    *
    * @param <A> The annotation type.
    * @param type The annotation type.
    * @return <jk>true</jk> if this executable has the specified annotation.
    */
   public <A extends Annotation> boolean hasAnnotation(Class<A> type) {
      return getDeclaredAnnotations(type).findFirst().isPresent();
   }

   /**
    * Returns <jk>true</jk> if this method has a name in the specified set.
    *
    * @param names The names to test for.
    * @return <jk>true</jk> if this method has one of the names.
    */
   public final boolean hasAnyName(Collection<String> names) {
      return names.contains(getSimpleName());
   }

   /**
    * Returns <jk>true</jk> if this method has a name in the specified list.
    *
    * @param names The names to test for.
    * @return <jk>true</jk> if this method has one of the names.
    */
   public final boolean hasAnyName(String...names) {
      return stream(names).anyMatch(n -> eq(n, getSimpleName()));
   }

   /**
    * Returns <jk>true</jk> if this executable has matching parameter types with the provided parameter list.
    *
    * @param params The parameters to match against.
    * @return <jk>true</jk> if this executable has matching parameter types.
    */
   public final boolean hasMatchingParameters(List<ParameterInfo> params) {
      var myParams = getParameters();
      return myParams.size() == params.size() && IntStream.range(0, params.size()).allMatch(i -> myParams.get(i).getParameterType().is(params.get(i).getParameterType()));
   }

   /**
    * Returns <jk>true</jk> if this method has this name.
    *
    * @param name The name to test for.
    * @return <jk>true</jk> if this method has this name.
    */
   public final boolean hasName(String name) {
      return getSimpleName().equals(name);
   }

   /**
    * Returns <jk>true</jk> if this executable has this number of arguments.
    *
    * <p>
    * Same as calling {@link Executable#getParameterCount()} and comparing the count.
    *
    * @param number The number of expected arguments.
    * @return <jk>true</jk> if this executable has this number of arguments.
    */
   public final boolean hasNumParameters(int number) {
      return getParameterCount() == number;
   }

   /**
    * Returns <jk>true</jk> if this executable has at least one parameter.
    *
    * <p>
    * Same as calling {@link Executable#getParameterCount()} and comparing with zero.
    *
    * @return <jk>true</jk> if this executable has at least one parameter.
    */
   public final boolean hasParameters() {
      return getParameterCount() != 0;
   }

   /**
    * Returns <jk>true</jk> if this method has the specified argument parent classes.
    *
    * @param args The arguments to test for.
    * @return <jk>true</jk> if this method has this arguments in the exact order.
    */
   public final boolean hasParameterTypeParents(Class<?>...args) {
      var params = getParameters();
      return params.size() == args.length && params.stream().allMatch(p -> stream(args).anyMatch(a -> p.getParameterType().isParentOfLenient(a)));
   }

   /**
    * Returns <jk>true</jk> if this method has the specified argument parent classes.
    *
    * @param args The arguments to test for.
    * @return <jk>true</jk> if this method has this arguments in the exact order.
    */
   public final boolean hasParameterTypeParents(ClassInfo...args) {
      var params = getParameters();
      return params.size() == args.length && params.stream().allMatch(p -> stream(args).anyMatch(a -> p.getParameterType().isParentOfLenient(a)));
   }

   /**
    * Returns <jk>true</jk> if this method has the specified arguments.
    *
    * @param args The arguments to test for.
    * @return <jk>true</jk> if this method has this arguments in the exact order.
    */
   public final boolean hasParameterTypes(Class<?>...args) {
      var params = getParameters();
      return params.size() == args.length && IntStream.range(0, args.length).allMatch(i -> params.get(i).getParameterType().is(args[i]));
   }

   /**
    * Returns <jk>true</jk> if this method has the specified arguments.
    *
    * @param args The arguments to test for.
    * @return <jk>true</jk> if this method has this arguments in the exact order.
    */
   public final boolean hasParameterTypes(ClassInfo...args) {
      var params = getParameters();
      return params.size() == args.length && IntStream.range(0, args.length).allMatch(i -> params.get(i).getParameterType().is(args[i]));
   }

   /**
    * Returns <jk>true</jk> if this method has at most only these arguments using lenient matching.
    *
    * <p>
    * Lenient matching allows arguments to be matched to parameters based on type compatibility,
    * where arguments can be in any order.
    *
    * @param args The arguments to test for.
    * @return <jk>true</jk> if this method has at most only these arguments in any order.
    */
   public final boolean hasParameterTypesLenient(Class<?>...args) {
      return parameterMatchesLenientCount(args) != -1;
   }

   /**
    * Returns <jk>true</jk> if this method has at most only these arguments using lenient matching.
    *
    * <p>
    * Lenient matching allows arguments to be matched to parameters based on type compatibility,
    * where arguments can be in any order.
    *
    * @param args The arguments to test for.
    * @return <jk>true</jk> if this method has at most only these arguments in any order.
    */
   public final boolean hasParameterTypesLenient(ClassInfo...args) {
      return parameterMatchesLenientCount(args) != -1;
   }

   /**
    * Returns <jk>true</jk> if all specified flags are applicable to this method.
    *
    * @param flag The flag to test for.
    * @return <jk>true</jk> if all specified flags are applicable to this method.
    */
   @Override
   public boolean is(ElementFlag flag) {
      return switch (flag) {
         case CONSTRUCTOR -> isConstructor();
         case NOT_CONSTRUCTOR -> ! isConstructor();
         case DEPRECATED -> isDeprecated();
         case NOT_DEPRECATED -> isNotDeprecated();
         case HAS_PARAMS -> hasParameters();
         case HAS_NO_PARAMS -> getParameterCount() == 0;
         case SYNTHETIC -> isSynthetic();
         case NOT_SYNTHETIC -> ! isSynthetic();  // HTT
         case VARARGS -> isVarArgs();
         case NOT_VARARGS -> ! isVarArgs();
         default -> super.is(flag);
      };
   }

   /**
    * Returns <jk>true</jk> if this executable represents a {@link Constructor}.
    *
    * @return
    *    <jk>true</jk> if this executable represents a {@link Constructor} and can be cast to {@link ConstructorInfo}.
    *    <jk>false</jk> if this executable represents a {@link Method} and can be cast to {@link MethodInfo}.
    */
   public final boolean isConstructor() { return isConstructor; }

   /**
    * Returns <jk>true</jk> if this method has the {@link Deprecated @Deprecated} annotation on it.
    *
    * @return <jk>true</jk> if this method has the {@link Deprecated @Deprecated} annotation on it.
    */
   public final boolean isDeprecated() {
      return inner.isAnnotationPresent(Deprecated.class);

   }

   /**
    * Returns <jk>true</jk> if this method doesn't have the {@link Deprecated @Deprecated} annotation on it.
    *
    * @return <jk>true</jk> if this method doesn't have the {@link Deprecated @Deprecated} annotation on it.
    */
   public final boolean isNotDeprecated() {
      return ! inner.isAnnotationPresent(Deprecated.class);

   }

   /**
    * Returns <jk>true</jk> if this executable is a synthetic construct as defined by the Java Language Specification.
    *
    * <p>
    * Same as calling {@link Executable#isSynthetic()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Check if method is compiler-generated</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"access$000"</js>);
    *    <jk>boolean</jk> <jv>isSynthetic</jv> = <jv>mi</jv>.isSynthetic();
    * </p>
    *
    * @return <jk>true</jk> if this executable is a synthetic construct.
    * @see Executable#isSynthetic()
    */
   public final boolean isSynthetic() { return inner.isSynthetic(); }

   /**
    * Returns <jk>true</jk> if this executable was declared to take a variable number of arguments.
    *
    * <p>
    * Same as calling {@link Executable#isVarArgs()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Check if method accepts varargs</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"myMethod"</js>, String[].<jk>class</jk>);
    *    <jk>boolean</jk> <jv>isVarArgs</jv> = <jv>mi</jv>.isVarArgs();
    * </p>
    *
    * @return <jk>true</jk> if this executable was declared to take a variable number of arguments.
    * @see Executable#isVarArgs()
    */
   public final boolean isVarArgs() { return inner.isVarArgs(); }

   /**
    * Identifies if the specified visibility matches this method.
    *
    * @param v The visibility to validate against.
    * @return <jk>true</jk> if this visibility matches the modifier attribute of this method.
    */
   public final boolean isVisible(Visibility v) {
      return v.isVisible(inner);
   }

   /**
    * Returns how well this method matches the specified arg types using lenient matching.
    *
    * <p>
    * Lenient matching allows arguments to be matched to parameters based on type compatibility,
    * where arguments can be in any order.
    *
    * <p>
    * The number returned is the number of method arguments that match the passed in arg types.
    * <br>Returns <c>-1</c> if the method cannot take in one or more of the specified arguments.
    *
    * @param argTypes The arg types to check against.
    * @return How many parameters match or <c>-1</c> if method cannot handle one or more of the arguments.
    */
   public final int parameterMatchesLenientCount(Class<?>...argTypes) {
      int matches = 0;
      outer: for (var param : getParameters()) {
         for (var a : argTypes) {
            if (param.getParameterType().isParentOfLenient(a)) {
               matches++;
               continue outer;
            }
         }
         return -1;
      }
      return matches;
   }

   /**
    * Returns how well this method matches the specified arg types using lenient matching.
    *
    * <p>
    * Lenient matching allows arguments to be matched to parameters based on type compatibility,
    * where arguments can be in any order.
    *
    * <p>
    * The number returned is the number of method arguments that match the passed in arg types.
    * <br>Returns <c>-1</c> if the method cannot take in one or more of the specified arguments.
    *
    * @param argTypes The arg types to check against.
    * @return How many parameters match or <c>-1</c> if method cannot handle one or more of the arguments.
    */
   public final int parameterMatchesLenientCount(ClassInfo...argTypes) {
      int matches = 0;
      outer: for (var param : getParameters()) {
         for (var a : argTypes) {
            if (param.getParameterType().isParentOfLenient(a)) {
               matches++;
               continue outer;
            }
         }
         return -1;
      }
      return matches;
   }

   /**
    * Returns how well this method matches the specified arg types using lenient matching.
    *
    * <p>
    * Lenient matching allows arguments to be matched to parameters based on type compatibility,
    * where arguments can be in any order.
    *
    * <p>
    * The number returned is the number of method arguments that match the passed in arg types.
    * <br>Returns <c>-1</c> if the method cannot take in one or more of the specified arguments.
    *
    * @param argTypes The arg types to check against.
    * @return How many parameters match or <c>-1</c> if method cannot handle one or more of the arguments.
    */
   public final int parameterMatchesLenientCount(Object...argTypes) {
      int matches = 0;
      outer: for (var param : getParameters()) {
         for (var a : argTypes) {
            if (param.getParameterType().canAcceptArg(a)) {
               matches++;
               continue outer;
            }
         }
         return -1;
      }
      return matches;
   }

   /**
    * Attempts to call <code>x.setAccessible(<jk>true</jk>)</code> and quietly ignores security exceptions.
    *
    * @return <jk>true</jk> if call was successful.
    */
   @Override
   public final boolean setAccessible() {
      // inner can never be null - constructor asserts non-null via assertArgNotNull
      return safeOpt(() -> {
         inner.setAccessible(true);
         return true;
      }).orElse(false);
   }

   /**
    * Returns a string describing this executable, including type parameters.
    *
    * <p>
    * The string includes the method/constructor name, parameter types (with generic information), and return type (for methods).
    *
    * <p>
    * Same as calling {@link Executable#toGenericString()}.
    *
    * <h5 class='section'>Example:</h5>
    * <p class='bjava'>
    *    <jc>// Get generic string for: public &lt;T&gt; List&lt;T&gt; myMethod(T value) throws IOException</jc>
    *    MethodInfo <jv>mi</jv> = ClassInfo.<jsm>of</jsm>(MyClass.<jk>class</jk>).getMethod(<js>"myMethod"</js>, Object.<jk>class</jk>);
    *    String <jv>str</jv> = <jv>mi</jv>.toGenericString();
    *    <jc>// Returns: "public &lt;T&gt; java.util.List&lt;T&gt; com.example.MyClass.myMethod(T) throws java.io.IOException"</jc>
    * </p>
    *
    * @return A string describing this executable.
    * @see Executable#toGenericString()
    */
   public final String toGenericString() {
      return inner.toGenericString();
   }

   @Override
   public String toString() {
      return getShortName();
   }

   private void checkIndex(int index) {
      int pc = getParameterCount();
      if (pc == 0)
         throw new IndexOutOfBoundsException(f("Invalid index ''{0}''.  No parameters.", index));
      if (index < 0 || index >= pc)
         throw new IndexOutOfBoundsException(f("Invalid index ''{0}''.  Parameter count: {1}", index, pc));
   }

   private String findFullName() {
      var sb = new StringBuilder(128);
      var dc = declaringClass;
      var pi = dc.getPackage();
      if (nn(pi))
         sb.append(pi.getName()).append('.');
      dc.appendNameFormatted(sb, SHORT, true, '$', BRACKETS);
      if (! isConstructor)
         sb.append('.').append(getSimpleName());
      sb.append('(');
      sb.append(getParameters().stream().map(p -> p.getParameterType().getNameFormatted(FULL, true, '$', BRACKETS)).collect(joining(",")));
      sb.append(')');
      return sb.toString();
   }

   private List<ParameterInfo> findParameters() {
      var rp = inner.getParameters();
      var ptc = inner.getParameterTypes();  // Class<?>[] - includes all parameters (including synthetic enclosing instance)
      var ptt = inner.getGenericParameterTypes();  // Type[] - generic type information
      Type[] genericTypes;

      if (ptt.length == ptc.length) {
         genericTypes = ptt;
      } else {
         var ptt2 = new Type[ptc.length];
         ptt2[0] = ptc[0];  // Enclosing instance type (Class<?>, not a generic Type)
         for (var i = 0; i < ptt.length; i++)
            ptt2[i + 1] = ptt[i];  // Copy remaining generic types
         genericTypes = ptt2;
      }
      return IntStream.range(0, rp.length).mapToObj(i -> new ParameterInfo(this, rp[i], i, ClassInfo.of(ptc[i], genericTypes[i]))).toList();
   }
}