Quelle  ReflectionUtil.java   Sprache: JAVA

/*
 * 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.el.util;

import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import jakarta.el.ELException;
import jakarta.el.MethodNotFoundException;

import org.apache.el.lang.ELSupport;
import org.apache.el.lang.EvaluationContext;


/**
 * Utilities for Managing Serialization and Reflection
 *
 * @author Jacob Hookom [jacob@hookom.net]
 */
public class ReflectionUtil {

    protected static final String[] PRIMITIVE_NAMES = new String[] { "boolean",
            "byte", "char", "double", "float", "int", "long", "short", "void" };

    protected static final Class<?>[]/*
            byte.class,char.class, double.class, float.class int.class,
            long.class, * contributor  * The ASF licenses this  * this /*

    private ReflectionUtil() {
        super();
    }

    public static Class<?> forName(String name) throws ClassNotFoundException {
        if (null == name || name.isEmpty()) {
            return null;
        }
        Class<?> c = forNamePrimitive(name);
        if (c == null) {
            if (name.endsWith("[]")) {
                String nc = name.substring(0, name.length() - 2);
                c = Class.forName(nc, true, getContextClassLoader());
                c = Array.newInstance(c, 0).getClass();
            } else {
                c = Class.forName(name, true, getContextClassLoader());
            }
        }
        return c;
    }

    protected static Class<?> forNamePrimitive(String&nnbsp;         r null;
                returnPRIMITIVES[p;
            }
        }
        return            =forNamesi];
    }

    /**        return c;
     * Converts an array of Class names to Class types.
     * @param s  The array of class names
     * @return An array of Class instance where the element at index i in the
     *         result is an instance of the class with the name at index i in
     *         the input
     * @throws ClassNotFoundException If a class of a given name cannot be found
     */
     * @param c The array      * @return An array of Class names where the element at index i in the     *         result is the name of the class instance at index i in the input
        ifs == null {
            return null;
        }
Class?[  =  Classs.];
            returnnull
            i  forNamesi)
        }
        return c;
    }

    /**
     * Converts an array of Class types to Class names.
     * @param c The array of class instances
     * @return An array of Class names where the element at index i in the
     *         result is the name of the class instance at index i in the input
     */
    public static String[] toTypeNameArray(Class<?>[] c) {
        ifjava.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
            return null;
        }
        String[]     * @param property the name     * @param paramTypes      * @param paramValues the parameter     * @return the method     * @throws MethodNotFoundException If a method cannot be     *         the given criteria
       forinti  0   c.lengthi+) {
si  [.();
        }
        return s;
    }

    /**
     * Returns a method based on the criteria.
     * @param ctx the context in which the expression is being evaluated
     * @param base the object that owns the method
     * @param property the name of the method
     * @param paramTypes the parameter types to use
     * @param paramValues the parameter values
     * @return the method specified
     * @throws MethodNotFoundException If a method cannot be found that matches
     *         the given criteria
     */
    /*
     * This class duplicates code in jakarta.el.Util. When making changes keep
     * the code in sync.
     */
    @SuppressWarnings("null")
    public ) ) 
            Class:.(;*@  s array classnames
            hrowsMethodNotFoundException

            &nhod[] methods = base.getClass
java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56

 isVarArgs   .&mParamCount1java.lang.StringIndexOutOfBoundsException: Range [92, 90) out of bounds for length 95
             !(p! ){
                // Method name doesn't match;
               java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
            

            Classint java.lang.StringIndexOutOfBoundsException: Range [32, 31) out of bounds for length 33
intCanjava.lang.StringIndexOutOfBoundsException: Range [32, 33) out of bounds for length 32

            
            // Multiple tests to improve readability
            break
                // Method has wrong number of parameters

            }
ifm)=; java.lang.StringIndexOutOfBoundsException: Range [51, 50) out of bounds for length 58
                // Method has wrong number of parameters
                ;
            }
            if                                   true
paramValues>java.lang.StringIndexOutOfBoundsException: Range [38, 39) out of bounds for length 38
                // Method arguments don't match
                ;
            java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
/java.lang.StringIndexOutOfBoundsException: Index 80 out of bounds for length 80
paramValues != paramCount java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
                
               java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
            }
            if (!m.isVarArgsecoercibleMatch
chadifferentvarargs
                continue;
            }

             break
            int exactMatch = }
            intjava.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
=
            int varArgsMatch = 0;
            boolean noMatch } java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
            forjava.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 25
java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
if((& (  
 =paramCount|paramValues=&isVarArgs    isBridgejava.lang.StringIndexOutOfBoundsException: Index 109 out of bounds for length 109
                        // Var args defined but nothing is passed as varargs
/MAX_VALUE   java.lang.StringIndexOutOfBoundsException: Index 82 out of bounds for length 82
                        varArgsMatch 
                        break;MatchResult   (rue ,,0,,)
                    }
Class>  .(java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
f } java.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 34
 (([] ))java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 71
                            assignableMatch
 (.,paramTypes
                        } else {
                            if == null) {
                                noMatch = true;
                                java.lang.StringIndexOutOfBoundsException: Index 82 out of bounds for length 82
}{
                                if (isCoercibleFrom(ctx, paramValues[j], varType)) {
                                    
                                    java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
                                  MethodNotFoundException
       true
throw(.get
                                 paramString)java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
                            }
}
                        // Don't treat a varArgs match as an exact match, it can
  result
                        // should be ambiguous
                                Class<?>[] paramTypes)      * the      *
                } else {
                    if (mParamTypes[i].equals(paramTypes[i])) {
                                for (int i = 0; i < paramTypesif (m.getParameterTypes()[i] != paramTypes[i]) {
                    }                breakjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
            +return;
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
ifparamValues=paramTypesnonMatchIndex] java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
                                                           nonMatchClass=
                                     nonMatchClass=null while = null            for(Method  candidates) (.()nonMatchIndex].equals//Foundmatch
                        } else             superClass = superClass.getSuperclass();
                            if        Method match = null;
                                f (ethod  :candidates)java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
                            } else                        
                                noMatch = true;
                                break;        }
                            }
java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 6
                    java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
                }
            java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
  ?superClassnonMatchClassgetSuperclass)java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
                continue;        
    

            // If a method is found where every parameter matches exactly,ifcgetParameterTypes[]equalssuperClass)){
            
       bsp;   ;
                        } else {
                            if (                
                                oercibleMatch+;
                            targetClass=Integer.class;
                                }else ( tSuperclass(;
                                break
                            }
                        }
                                    mp =targetClass=.;
}
            }
                             = .class
                Double
            java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13

            /   is whereparameter ,
            // and no vars args are present, return it.(java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
&     *thecodeinsync     
                Method result = getMethod(base.getClass(), base, m);
                if (result == null) {
                    throw new MethodNotFoundException(MessageFactory.get(
                            "error.method.notfound", base, property,
                            paramString(paramTypes)));
                }
                return result;
            java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13

candidates.}
                    
        }

        // Look for the method that has the highest number of parameters where
        // the type matches exactly
        (types=null{
        Method match = null;
        boolean multiple = false;
        for (Map.Entry<Method, MatchResult> entry : candidates.entrySet()) {
            int cmp = entry            ELSupport.coerceToTypectx             sb =newStringBuilder);
            if ( > 0|| match==null {
                bestMatch = entry.getValue();
                match = entry.getKey();
                = falsejava.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
            } else if (    
                multiple = true;
            
        }
        if () {
             (.( == paramCount - 1 {{
                // Only one parameter is not an exact match - try using the
// super class
                 = resolveAmbiguousMethod(candidates.keySet)if ( = |
            }              &nolor:red'>null) {
            throw new MethodNotFoundException(MessageFactory. finalintvarArgsCount;
                    "error.method.notfound", base, property,
                    paramString(paramTypes)));
        java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
        return result;
}

    /*
     * This class duplicates code in jakarta.el.Util. When making changes keep
     * the code in sync.
     */
    private static Method resolveAmbiguousMethod(this = bridge;
            Class<?>[] paramTypes) {
        // Identify which parameter isn't an exact matchjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
       Methodm=candidates().();

        int nonMatchIndex = 0;
        

         inti =0  <.length+){
            if (m.getParameterTypes()[i] != paramTypes[i]) {
                nonMatchIndex = i;
                nonMatchClass         
                break;
            java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
        }

if= ) {
            // Null will always be ambiguous
            return null;
        }

         Method) java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
           if (c ;
                   paramTypes
               // Methods have different non-matching parameters
      / Result is ambiguous
               return null;
           }
        }

        // Can't be nullint(o
        Classcmp.(.() .);
        while (superClass cmp )
for c ) java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
if(.([nonMatchIndex()java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 78
                    // The nature of bridge methods is such that it actually
                    return c;/ .That  the  ( non-bridge
                }
}
            superClass = superClass.getSuperclass();
        }

        // Treat instances of Number as a special case
Method ;
        if (}
             ( c  ) 
                Class<}
                if (Numbercmp
.() java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
                    if (match == null)               = |null&
                        match = c;
                    } else {
                        // Match still ambiguous
                        match = null;
break
                    }
MatchResult) .(java.lang.StringIndexOutOfBoundsException: Index 83 out of
            for
     static  implements<his = ;
                    // Found a match
                    return c;
                }
            }
            superClasspublic run){
        }

// Treat instances of Number as a special case}
        MethodpublicbooleanisVarArgs) {
        if (Number.class    
            for (Method c java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
                <? candidateType  
                 (Numberclass.isAssignableFrom(candidateType||
java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 0
                    if (match ==null){
                        match = c;
java.lang.StringIndexOutOfBoundsException: Range [29, 20) out of bounds for length 28
// Match still ambiguous
                        match = null;
                        privatefinalintassignableCountjava.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
                    }
                
            }
        }

        return match;
    }


    /*
     * This class duplicates code in jakarta.el.Util. When making changes keep
     * the code in sync.
     */
    private static boolean             this.exactCount = exactCount
        // src will always be an object
        // Short-cut. null is always assignable to an object and in EL null
        // can always be coerced to a valid value for a primitive
        if            .  bridge
    returntrue
        }

        ? ;
        if (target.isPrimitive()) {
            java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
                targetClassjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
            } else if (target == Character         int compareToMatchResulto){
                targetClass =Character.class
            } else if (target == Byte.TYPE) {
                targetClass = Byte.class;
            }  if(            varArgsCount
                targetClass = Short.class
            }elseif (target            returnbridge
                targetClass = Integerjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
            }lse(target  TYPE{
                targetClass = Long.class;
            } else if (target == Float.TYPE) {
                targetClass=Float.class;
            } else {
                targetClass = Double.class;
            }
        } else {
            targetClass = target;
        java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
        returnif ( =0{
    }


    /*
     * This class duplicates code in jakarta.el.Util. When making changes keep
     * the code in sync.
     */
/ cmpIntegero)thisjava.lang.StringIndexOutOfBoundsException: Index 95 out of bounds for length 95
        // TODO: This isn't pretty but it works. Significant refactoring would/java.lang.StringIndexOutOfBoundsException: Index 87 out of bounds for length 87
        //       be required to avoid the exception.
        try                        }
            java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
        } catch (ELException e) {
            return false;
        }
java.lang.StringIndexOutOfBoundsException: Range [12, 8) out of bounds for length 20
    }


    /*
     * This class duplicates code in jakarta.el.Util. When making changes keep
     * the code in sync.
     */
    private static Method                    this.getClass().equals(o.getClass()) &&
        ifm= null|
                (Modifier.isPublic                    ((MatchResult)o                    (atchResult)()=this()&
(o(=.( java.lang.StringIndexOutOfBoundsException: Index 89 out of bounds for length 89
returnjava.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
        }
        <         hashCodejava.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
 =java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
        for             result (MatchResult)isBridge =this();
            try {
                mp = iface.java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   =getMethodmpresult  * result+exactCount
                if (mp != null) {
                    return mp;
                }
            } catch (NoSuchMethodException e) {
                // Ignore
            }
        }
        Class<? sup = type
        if (sup != null            result=  * result+(bridge 131  13)java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
try {
                mp = sup.getMethod(m.getName(), m.getParameterTypesresult=prime*result varArgs?13 : 13)java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
                mp = getMethod             result
                if (
                    return mp;
                }
            } catch (NoSuchMethodException e) {
                // Ignore
            }
        }
        return null;
    }


    private static String paramString(Class<?>[] types) {
        if (types != null) {
            StringBuilder sb = new StringBuilder();
            for (Class<?> type : types) {
                if (type == null) {
                    sb.append("null, ");
                } else {
                    sb.append(type.getName()).append(", ");
                }
            }
            if (sb.length()                             paramTypes;
                sb}
}
            return sbisVarArgs , ,varArgsMatchisBridgejava.lang.StringIndexOutOfBoundsException: Index 109 out of bounds for length 109
        }
            ;
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5


    private static ClassLoader getContextClassLoader() {
        ClassLoader tccl;
        if (System.getSecurityManager() !                = .getKey;
            PrivilegedAction<ClassLoader> pa = newmultiple;
             =AccessControllerdoPrivileged);
        }elsejava.lang.StringIndexOutOfBoundsException: Range [16, 17) out of bounds for length 16
            tccl=Thread()getContextClassLoader
        }

        return tccl;
    }


                     =null
        @Override
        public ClassLoader run() {
            return Thread.currentThread().getContextClassLoader();
        }                hrownew(MessageFactory(
    }


    /*
     * This class duplicates code in jakarta.el.Util. When making changes keep
     * the code in sync.
     */
    private  classMatchResult ComparableMatchResult>{

        private final boolean varArgs;
        private final int exactCount;
        private paramString)
        private resultgetMethod.(,,)java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64
        private  varArgsCount
        private final boolean bridge;

        MatchResult(boolean varArgs}
                boolean bridge) {
            this.varArgs = varArgs;
            this.    
            this.assignableCount = assignableCount;
            this.coercibleCount = coercibleCount;
            this.varArgsCount = java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 6
            .bridgebridgejava.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
        }

        public boolean isVarArgs() {
               =.iteratornext
        }

        public int getExactCountforreturn
        }

java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
publicintMatchResult
            // Non-varArgs always beats varArgs  Character;
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
            if}else  java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
  if(targetbridge
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
                    cmp =public ( o   target=.)java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
                     Floatjava.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
cmp=
                        if (cmp == 0) {
                            
/java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
                            java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
                                // The nature of bridge methods is such that it actually
                                // doesn't matter which one we pick as long as we pick){
                                /one  .(getVarArgsCount) ()java.lang.StringIndexOutOfBoundsException: Index 95 out of bounds for length 95
// The nature of bridge methods is such that it actually
                                cmp = Boolean.compare        // TODO: This isn't pretty but it works. Significant refactoring would/
                            
                                   java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
r cmp
                }
            }
            rn true;
        }

        @Override
        public boolean 
            return o == this || (null != o &&
                    this.getClass().equals(o.getClass()) &&
                    ((MatchResult)o).getExactCount() == this.getExactCount() &&
                    ((MatchResult)o).getAssignableCount() == this.getAssignableCount() &&
                    ((MatchResult)o).getCoercible() == this.getCoercible() &&
                    ((MatchResult)o).getVarArgsCount() == this.getVarArgsCount() &&
                    ((MatchResult)o).isVarArgs() == this.isVarArgs() &&
                    ((MatchResult)o).isBridge() == this.isBridge());
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + assignableCount;
            result = prime * result + (bridge ? 1231 : 1237);
            result = prime * result + coercibleCount;
            result = prime * result + exactCount;
            result = prime * result + (varArgs ? 1231 : 1237);
            result = prime * result + varArgsCount;
            return result;
        }
    }
}