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/*
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.xml.internal.bind.v2.model.nav;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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import java.lang.reflect.Type;
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import java.util.Collection;
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import com.sun.xml.internal.bind.v2.runtime.Location;
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/**
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* Provides unified view of the underlying reflection library,
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* such as {@code java.lang.reflect} and/or Annotation Processing.
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*
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* <p>
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* This interface provides navigation over the reflection model
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* to decouple the caller from any particular implementation.
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* This allows the JAXB RI to reuse much of the code between
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* the compile time (which works on top of Annotation Processing) and the run-time
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* (which works on top of {@code java.lang.reflect})
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*
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* <p>
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* {@link Navigator} instances are stateless and immutable.
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*
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*
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* <h2>Parameterization</h2>
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* <h3>C</h3>
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* <p>
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* A Java class declaration (not an interface, a class and an enum.)
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*
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* <h3>T</h3>
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* <p>
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* A Java type. This includs declaration, but also includes such
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* things like arrays, primitive types, parameterized types, and etc.
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*
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* @author Kohsuke Kawaguchi (kk@kohsuke.org)
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*/
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public interface Navigator<T,C,F,M> {
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/**
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* Gets the base class of the specified class.
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*
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* @return
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* null if the parameter represents {@link Object}.
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*/
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C getSuperClass(C clazz);
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/**
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* Gets the parameterization of the given base type.
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*
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* <p>
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* For example, given the following
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* <pre><xmp>
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* interface Foo<T> extends List<List<T>> {}
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* interface Bar extends Foo<String> {}
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* </xmp></pre>
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* This method works like this:
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* <pre><xmp>
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* getBaseClass( Bar, List ) = List<List<String>
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* getBaseClass( Bar, Foo ) = Foo<String>
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* getBaseClass( Foo<? extends Number>, Collection ) = Collection<List<? extends Number>>
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* getBaseClass( ArrayList<? extends BigInteger>, List ) = List<? extends BigInteger>
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* </xmp></pre>
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*
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* @param type
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* The type that derives from {@code baseType}
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* @param baseType
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* The class whose parameterization we are interested in.
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* @return
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* The use of {@code baseType} in {@code type}.
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* or null if the type is not assignable to the base type.
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*/
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T getBaseClass(T type, C baseType);
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/**
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* Gets the fully-qualified name of the class.
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* ("java.lang.Object" for {@link Object})
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*/
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String getClassName(C clazz);
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/**
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* Gets the display name of the type object
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*
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* @return
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* a human-readable name that the type represents.
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*/
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String getTypeName(T rawType);
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/**
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* Gets the short name of the class ("Object" for {@link Object}.)
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*
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* For nested classes, this method should just return the inner name.
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* (for example "Inner" for "com.acme.Outer$Inner".
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*/
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String getClassShortName(C clazz);
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/**
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* Gets all the declared fields of the given class.
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*/
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Collection<? extends F> getDeclaredFields(C clazz);
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/**
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* Gets the named field declared on the given class.
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*
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* This method doesn't visit ancestors, but does recognize
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* non-public fields.
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*
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* @return
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* null if not found
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*/
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F getDeclaredField(C clazz, String fieldName);
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/**
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* Gets all the declared methods of the given class
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* (regardless of their access modifiers, regardless
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* of whether they override methods of the base classes.)
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*
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* <p>
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* Note that this method does not list methods declared on base classes.
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*
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* @return
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* can be empty but always non-null.
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*/
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Collection<? extends M> getDeclaredMethods(C clazz);
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/**
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* Gets the class that declares the given field.
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*/
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C getDeclaringClassForField(F field);
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/**
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* Gets the class that declares the given method.
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*/
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C getDeclaringClassForMethod(M method);
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/**
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* Gets the type of the field.
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*/
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T getFieldType(F f);
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/**
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* Gets the name of the field.
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*/
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String getFieldName(F field);
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/**
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* Gets the name of the method, such as "toString" or "equals".
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*/
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String getMethodName(M m);
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/**
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* Gets the return type of a method.
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*/
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T getReturnType(M m);
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/**
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* Returns the list of parameters to the method.
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*/
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T[] getMethodParameters(M method);
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/**
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* Returns true if the method is static.
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*/
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boolean isStaticMethod(M method);
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/**
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* Checks if {@code sub} is a sub-type of {@code sup}.
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*
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* TODO: should this method take T or C?
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*/
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boolean isSubClassOf(T sub, T sup);
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/**
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* Gets the representation of the given Java type in {@code T}.
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*
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* @param c
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* can be a primitive, array, class, or anything.
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* (therefore the return type has to be T, not C)
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*/
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T ref(Class c);
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/**
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* Gets the T for the given C.
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*/
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T use(C c);
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/**
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* If the given type is an use of class declaration,
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* returns the type casted as {@code C}.
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* Otherwise null.
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*
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* <p>
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* TODO: define the exact semantics.
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*/
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C asDecl(T type);
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/**
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* Gets the {@code C} representation for the given class.
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*
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* The behavior is undefined if the class object represents
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* primitives, arrays, and other types that are not class declaration.
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*/
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C asDecl(Class c);
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/**
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* Checks if the type is an array type.
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*/
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boolean isArray(T t);
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/**
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* Checks if the type is an array type but not byte[].
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*/
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boolean isArrayButNotByteArray(T t);
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/**
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* Gets the component type of the array.
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*
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* @param t
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* must be an array.
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*/
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T getComponentType(T t);
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/**
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* Gets the i-th type argument from a parameterized type.
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*
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* For example, {@code getTypeArgument([Map<Integer,String>],0)=Integer}
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*
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* @throws IllegalArgumentException
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* If t is not a parameterized type
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* @throws IndexOutOfBoundsException
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* If i is out of range.
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*
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* @see #isParameterizedType(Object)
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*/
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T getTypeArgument(T t, int i);
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/**
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* Returns true if t is a parameterized type.
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*/
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boolean isParameterizedType(T t);
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/**
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* Checks if the given type is a primitive type.
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*/
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boolean isPrimitive(T t);
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/**
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* Returns the representation for the given primitive type.
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*
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* @param primitiveType
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* must be Class objects like {@link Integer#TYPE}.
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*/
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T getPrimitive(Class primitiveType);
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/**
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* Returns a location of the specified class.
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*/
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Location getClassLocation(C clazz);
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Location getFieldLocation(F field);
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Location getMethodLocation(M getter);
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/**
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* Returns true if the given class has a no-arg default constructor.
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* The constructor does not need to be public.
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*/
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boolean hasDefaultConstructor(C clazz);
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/**
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* Returns true if the field is static.
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*/
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boolean isStaticField(F field);
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/**
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* Returns true if the method is public.
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*/
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boolean isPublicMethod(M method);
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/**
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* Returns true if the method is final.
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*/
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boolean isFinalMethod(M method);
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/**
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* Returns true if the field is public.
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*/
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boolean isPublicField(F field);
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/**
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* Returns true if this is an enum class.
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*/
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boolean isEnum(C clazz);
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/**
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* Computes the erasure
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*/
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<P> T erasure(T contentInMemoryType);
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// This unused P is necessary to make ReflectionNavigator.erasure work nicely
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/**
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* Returns true if this is an abstract class.
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*/
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boolean isAbstract(C clazz);
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/**
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* Returns true if this is a final class.
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*/
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boolean isFinal(C clazz);
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/**
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* Gets the enumeration constants from an enum class.
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*
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* @param clazz
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* must derive from {@link Enum}.
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*
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* @return
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* can be empty but never null.
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*/
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F[] getEnumConstants(C clazz);
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/**
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* Gets the representation of the primitive "void" type.
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*/
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T getVoidType();
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/**
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* Gets the package name of the given class.
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*
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* @return
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* i.e. "", "java.lang" but not null.
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*/
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String getPackageName(C clazz);
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/**
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* Finds ObjectFactory for the given referencePoint.
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*
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* @param referencePoint
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* The class that refers to the specified class.
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* @return
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* null if not found.
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*/
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C loadObjectFactory(C referencePoint, String packageName);
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/**
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* Returns true if this method is a bridge method as defined in JLS.
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*/
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boolean isBridgeMethod(M method);
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/**
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* Returns true if the given method is overriding another one
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* defined in the base class 'base' or its ancestors.
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*/
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boolean isOverriding(M method, C base);
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/**
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* Returns true if 'clazz' is an interface.
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*/
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boolean isInterface(C clazz);
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/**
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* Returns true if the field is transient.
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*/
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boolean isTransient(F f);
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/**
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* Returns true if the given class is an inner class.
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*
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* This is only used to improve the error diagnostics, so
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* it's OK to fail to detect some inner classes as such.
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*
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* Note that this method should return false for nested classes
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* (static classes.)
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*/
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boolean isInnerClass(C clazz);
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/**
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* Checks if types are the same
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* @param t1 type
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* @param t2 type
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* @return true if types are the same
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*/
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boolean isSameType(T t1, T t2);
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}
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