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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed 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.jboss.weld.util.reflection;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.GenericDeclaration;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;

import javax.enterprise.inject.spi.AnnotatedConstructor;
import javax.enterprise.inject.spi.AnnotatedField;
import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.AnnotatedParameter;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.InjectionPoint;

import org.jboss.classfilewriter.util.DescriptorUtils;
import org.jboss.weld.ejb.spi.BusinessInterfaceDescriptor;
import org.jboss.weld.resources.ClassLoaderResourceLoader;
import org.jboss.weld.resources.DefaultResourceLoader;
import org.jboss.weld.resources.WeldClassLoaderResourceLoader;
import org.jboss.weld.resources.spi.ResourceLoader;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

/**
 * Utility class to produce friendly names e.g. for debugging
 *
 * @author Pete Muir
 * @author Nicklas Karlsson
 * @author Jozef Hartinger
 */
public class Formats {

    private static final String SNAPSHOT = "SNAPSHOT";
    private static final String NULL = "null";
    private static final String SQUARE_BRACKETS = "[]";

    private static final String BCEL_CLASS_PARSER_FQCN = "com.sun.org.apache.bcel.internal.classfile.ClassParser";
    private static final String BCEL_JAVA_CLASS_FQCN = "com.sun.org.apache.bcel.internal.classfile.JavaClass";
    private static final String BCEL_METHOD_FQCN = "com.sun.org.apache.bcel.internal.classfile.Method";
    private static final String BCEL_LINE_NUMBER_TABLE_FQCN = "com.sun.org.apache.bcel.internal.classfile.LineNumberTable";
    private static final String BCEL_M_PARSE = "parse";
    private static final String BCEL_M_GET_METHODS = "getMethods";
    private static final String BCEL_M_GET_LINE_NUMBER_TABLE = "getLineNumberTable";
    private static final String BCEL_M_GET_SOURCE_LINE = "getSourceLine";
    private static final String BCEL_M_GET_NAME = "getName";
    private static final String BCEL_M_GET_MODIFIERS = "getModifiers";
    private static final String BCEL_M_GET_SIGNATURE = "getSignature";

    private static final String INIT_METHOD_NAME = "";

    private static final String BUILD_PROPERTIES_FILE = "weld-build.properties";
    private static final String BUILD_PROPERTIES_VERSION = "version";
    private static final String BUILD_PROPERTIES_TIMESTAMP = "timestamp";

    private static final String UPPER_BOUND = " extends ";
    private static final String WILDCARD = "?";
    private static final String WILDCARD_UPPER_BOUND = WILDCARD + UPPER_BOUND;
    private static final String WILDCARD_LOWER_BOUND = WILDCARD + " super ";

    private static final String GT = ">";
    private static final String LT = "<";

    private Formats() {
    }

    /**
     * See also WELD-1454.
     *
     * @param ij
     * @return the formatted string
     */
    public static String formatAsStackTraceElement(InjectionPoint ij) {
        Member member;
        if (ij.getAnnotated() instanceof AnnotatedField) {
            AnnotatedField annotatedField = (AnnotatedField) ij.getAnnotated();
            member = annotatedField.getJavaMember();
        } else if (ij.getAnnotated() instanceof AnnotatedParameter) {
            AnnotatedParameter annotatedParameter = (AnnotatedParameter) ij.getAnnotated();
            member = annotatedParameter.getDeclaringCallable().getJavaMember();
        } else {
            // Not throwing an exception, because this method is invoked when an exception is already being thrown.
            // Throwing an exception here would hide the original exception.
            return "-";
        }
        return formatAsStackTraceElement(member);
    }

    public static String formatAsStackTraceElement(Member member) {
        return member.getDeclaringClass().getName()
            + "." + (member instanceof Constructor ? INIT_METHOD_NAME : member.getName())
            + "(" + getFileName(member.getDeclaringClass()) + ":" + getLineNumber(member) + ")";
    }

    /**
     * Try to get the line number associated with the given member.
     *
     * The reflection API does not expose such an info and so we need to analyse the bytecode. Unfortunately, it seems there is no way to get this kind of
     * information for fields. Moreover, the LineNumberTable attribute is just optional, i.e. the compiler is not required to store this
     * information at all. See also Java Virtual Machine Specification
     *
     * Implementation note: it wouldn't be appropriate to add a bytecode scanning dependency just for this functionality, therefore Apache BCEL included in
     * Oracle JDK 1.5+ and OpenJDK 1.6+ is used. Other JVMs should not crash as we only use it if it's on the classpath and by means of reflection calls.
     *
     * @param member
     * @param resourceLoader
     * @return the line number or 0 if it's not possible to find it
     */
    public static int getLineNumber(Member member) {

        if (!(member instanceof Method || member instanceof Constructor)) {
            // We are not able to get this info for fields
            return 0;
        }

        ResourceLoader bcelResourceLoader = WeldClassLoaderResourceLoader.INSTANCE;

        if (!Reflections.isClassLoadable(BCEL_JAVA_CLASS_FQCN, bcelResourceLoader)) {
            // Try TCCL as a fallback
            bcelResourceLoader = DefaultResourceLoader.INSTANCE;
            if (!Reflections.isClassLoadable(BCEL_JAVA_CLASS_FQCN, bcelResourceLoader)) {
                // Apache BCEL classes not found on the classpath
                return 0;
            }
        }

        String classFile = member.getDeclaringClass().getName().replace('.', '/');
        ClassLoaderResourceLoader classFileResourceLoader = new ClassLoaderResourceLoader(member.getDeclaringClass().getClassLoader());
        InputStream in = null;

        try {
            URL classFileUrl = classFileResourceLoader.getResource(classFile + ".class");

            if (classFileUrl == null) {
                // The class file is not available
                return 0;
            }
            in = classFileUrl.openStream();

            Class classParserClass = Reflections.loadClass(BCEL_CLASS_PARSER_FQCN, bcelResourceLoader);
            Class javaClassClass = Reflections.loadClass(BCEL_JAVA_CLASS_FQCN, bcelResourceLoader);
            Class methodClass = Reflections.loadClass(BCEL_METHOD_FQCN, bcelResourceLoader);
            Class lntClass = Reflections.loadClass(BCEL_LINE_NUMBER_TABLE_FQCN, bcelResourceLoader);

            Object parser = classParserClass.getConstructor(InputStream.class, String.class).newInstance(in, classFile);
            Object javaClass = classParserClass.getMethod(BCEL_M_PARSE).invoke(parser);

            // First get all declared methods and constructors
            // Note that in bytecode constructor is translated into a method
            Object[] methods = (Object[]) javaClassClass.getMethod(BCEL_M_GET_METHODS).invoke(javaClass);
            Object match = null;

            String signature;
            String name;
            if (member instanceof Method) {
                signature = DescriptorUtils.methodDescriptor((Method) member);
                name = member.getName();
            } else if (member instanceof Constructor) {
                signature = DescriptorUtils.makeDescriptor((Constructor) member);
                name = INIT_METHOD_NAME;
            } else {
                return 0;
            }

            for (Object method : methods) {
                // Matching method must have the same name, modifiers and signature
                if (methodClass.getMethod(BCEL_M_GET_NAME).invoke(method).equals(name)
                        && methodClass.getMethod(BCEL_M_GET_MODIFIERS).invoke(method).equals(member.getModifiers())
                        && methodClass.getMethod(BCEL_M_GET_SIGNATURE).invoke(method).equals(signature)) {
                    match = method;
                }
            }
            if (match != null) {
                // If a method is found, try to obtain the optional LineNumberTable attribute
                Object lineNumberTable = methodClass.getMethod(BCEL_M_GET_LINE_NUMBER_TABLE).invoke(match);
                if (lineNumberTable != null) {
                    Integer line = (Integer) lntClass.getMethod(BCEL_M_GET_SOURCE_LINE, int.class).invoke(lineNumberTable, 0);
                    return line == -1 ? 0 : line;
                }
            }
            // No suitable method found
            return 0;

        } catch (Throwable t) {
            return 0;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (Exception e) {
                    return 0;
                }
            }
        }
    }

    private static String getFileName(Class clazz) {
        // TODO find the actual file name the class is declared in
        return clazz.getSimpleName() + ".java";
    }

    /**
     * A transformation from one object to a String.
     *
     * @param  the type of the function input
     */
    private interface Function {
        /**
         * Applies the function to an object of type {@code F}, resulting in an
         * object of type String.
         *
         * @param from     the source object
         * @param position the position in the list the object is at
         * @return the resulting object
         */
        String apply(F from, int position);

    }

    private static final Function SPACE_DELIMITER_FUNCTION = new Function() {

        @Override
        public String apply(Object from, int position) {
            if (position > 0) {
                return " " + (from == null ? NULL : from.toString());
            } else {
                return from == null ? NULL : from.toString();
            }
        }
    };

    private static final Function COMMA_DELIMITER_FUNCTION = new Function() {

        @Override
        public String apply(Object from, int position) {
            if (position > 0) {
                return ", " + (from == null ? NULL : from.toString());
            } else {
                return from == null ? NULL : from.toString();
            }
        }
    };

    private static final Function ANNOTATION_LIST_FUNCTION = new Function() {

        @Override
        public String apply(Annotation from, int position) {
            return spaceDelimiterFunction().apply("@" + from.annotationType().getSimpleName(), position);
        }

    };

    @SuppressWarnings("unchecked")
    private static  Function spaceDelimiterFunction() {
        return (Function) SPACE_DELIMITER_FUNCTION;
    }

    @SuppressWarnings("unchecked")
    private static  Function commaDelimiterFunction() {
        return (Function) COMMA_DELIMITER_FUNCTION;
    }

    public static String formatInjectionPointType(Type type) {
        if (type instanceof Class) {
            return ((Class) type).getSimpleName();
        } else {
            return Formats.formatType(type);
        }
    }

    public static String formatType(Type baseType) {
        return formatType(baseType, true);
    }

    public static String formatType(Type baseType, boolean simpleNames) {
        if (baseType == null) {
            return NULL;
        }
        if (baseType instanceof Class) {
            Class clazz = (Class) baseType;
            if (clazz.isArray()) {
                return formatType(clazz.getComponentType(), simpleNames) + SQUARE_BRACKETS;
            }
            return getClassName(clazz, simpleNames);
        }
        if (baseType instanceof ParameterizedType) {
            ParameterizedType parameterizedType = (ParameterizedType) baseType;
            return getClassName((Class) parameterizedType.getRawType(), simpleNames) + formatActualTypeArguments(parameterizedType.getActualTypeArguments());
        } else if (baseType instanceof WildcardType) {
            WildcardType wildcardType = (WildcardType) baseType;
            Type[] upperBound = wildcardType.getUpperBounds();
            Type[] lowerBound = wildcardType.getLowerBounds();
            if(lowerBound.length == 0 && Reflections.isEmptyBoundArray(upperBound)) {
                return WILDCARD;
            } else if(lowerBound.length == 0) {
                return WILDCARD_UPPER_BOUND + formatType(upperBound[0], simpleNames);
            }
            return WILDCARD_LOWER_BOUND + formatType(lowerBound[0], simpleNames);
        } else if (baseType instanceof GenericArrayType) {
            GenericArrayType gat = (GenericArrayType) baseType;
            return formatType(gat.getGenericComponentType(), simpleNames) + SQUARE_BRACKETS;
        } else if (baseType instanceof TypeVariable) {
            return formatTypeVariable((TypeVariable) baseType, simpleNames);
        }
        return baseType.toString();
    }

    private static String getClassName(Class clazz, boolean simpleNames) {
        if (simpleNames) {
            return clazz.getSimpleName();
        } else {
            return clazz.getName();
        }
    }

    public static String formatTypes(Iterable baseTypes, final boolean simpleNames) {
        return formatIterable(baseTypes, new Function() {

            @Override
            public String apply(Type from, int position) {
                return commaDelimiterFunction().apply(formatType(from, simpleNames), position);
            }

        });
    }

    public static String formatTypes(Iterable baseTypes) {
        return formatTypes(baseTypes, true);
    }

    public static String formatBusinessInterfaceDescriptors(Iterable> businessInterfaceDescriptors) {
        return formatIterable(businessInterfaceDescriptors, new Function>() {

            @Override
            public String apply(BusinessInterfaceDescriptor from, int position) {
                return commaDelimiterFunction().apply(formatType(from.getInterface()), position);
            }

        });
    }

    public static String addSpaceIfNeeded(String string) {
        if (string.length() > 0) {
            return string + " ";
        } else {
            return string;
        }
    }

    public static String formatAsFormalParameterList(Iterable> parameters) {
        return "(" + formatIterable(parameters, new Function>() {

            @Override
            public String apply(AnnotatedParameter from, int position) {
                return commaDelimiterFunction().apply(formatParameter(from), position);
            }

        }) + ")";
    }

    public static String formatParameter(AnnotatedParameter parameter) {
        return addSpaceIfNeeded(formatAnnotations(parameter.getAnnotations())) + formatType(parameter.getBaseType());
    }

    public static String formatModifiers(int modifiers) {
        return formatIterable(parseModifiers(modifiers), spaceDelimiterFunction());
    }

    private static  String formatIterable(Iterable items, Function function) {
        if (items == null) {
            return "";
        }
        StringBuilder stringBuilder = new StringBuilder();
        int i = 0;
        for (F item : items) {
            stringBuilder.append(function.apply(item, i));
            i++;
        }
        return stringBuilder.toString();
    }

    private static  String formatIterable(F[] items, Function function) {
        StringBuilder stringBuilder = new StringBuilder();
        int i = 0;
        for (F item : items) {
            stringBuilder.append(function.apply(item, i));
            i++;
        }
        return stringBuilder.toString();
    }

    /**
     * Parses a reflection modifier to a list of string
     *
     * @param modifiers The modifier to parse
     * @return The resulting string list
     */
    private static List parseModifiers(int modifiers) {
        List result = new ArrayList();
        if (Modifier.isPrivate(modifiers)) {
            result.add("private");
        }
        if (Modifier.isProtected(modifiers)) {
            result.add("protected");
        }
        if (Modifier.isPublic(modifiers)) {
            result.add("public");
        }
        if (Modifier.isAbstract(modifiers)) {
            result.add("abstract");
        }
        if (Modifier.isFinal(modifiers)) {
            result.add("final");
        }
        if (Modifier.isNative(modifiers)) {
            result.add("native");
        }
        if (Modifier.isStatic(modifiers)) {
            result.add("static");
        }
        if (Modifier.isStrict(modifiers)) {
            result.add("strict");
        }
        if (Modifier.isSynchronized(modifiers)) {
            result.add("synchronized");
        }
        if (Modifier.isTransient(modifiers)) {
            result.add("transient");
        }
        if (Modifier.isVolatile(modifiers)) {
            result.add("volatile");
        }
        if (Modifier.isInterface(modifiers)) {
            result.add("interface");
        }
        return result;
    }

    public static String formatActualTypeArguments(Type type) {
        if (type instanceof ParameterizedType) {
            return formatActualTypeArguments(ParameterizedType.class.cast(type).getActualTypeArguments());
        }
        return "";
    }

    public static String formatActualTypeArguments(Type[] actualTypeArguments) {
        return wrapIfNecessary(formatIterable(actualTypeArguments, new Function() {

            @Override
            public String apply(Type from, int position) {
                return commaDelimiterFunction().apply(formatType(from), position);
            }

        }), LT, GT);
    }

    public static String wrapIfNecessary(String string, String prepend, String append) {
        if (string != null && string.length() > 0) {
            return prepend + string + append;
        } else {
            return string;
        }
    }

    public static String formatAnnotations(Iterable annotations) {
        return formatIterable(annotations, ANNOTATION_LIST_FUNCTION);
    }

    /**
     * Gets a string representation from an array of annotations
     *
     * @param annotations The annotations
     * @return The string representation
     */
    public static String formatAnnotations(Annotation[] annotations) {
        return formatIterable(annotations, ANNOTATION_LIST_FUNCTION);
    }

    /**
     *
     * @param pkg This param is completely ignored
     * @return the formatted version
     */
    public static String version(@Deprecated Package pkg) {
        String version = null;
        String timestamp = null;
        // First try the weld-build.properties file
        Properties buildProperties = getBuildProperties();
        if (buildProperties != null) {
            version = buildProperties.getProperty(BUILD_PROPERTIES_VERSION);
            timestamp = buildProperties.getProperty(BUILD_PROPERTIES_TIMESTAMP);
        }
        if (version == null) {
            // If needed use the manifest info
            version = getManifestImplementationVersion();
        }
        return version(version, timestamp);
    }

    /**
     *
     * @return a simple version string, i.e. no formatting is applied
     */
    public static String getSimpleVersion() {
        Properties buildProperties = getBuildProperties();
        if(buildProperties != null) {
            buildProperties.getProperty(BUILD_PROPERTIES_VERSION);
        }
        return getManifestImplementationVersion();
    }

    @SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_MIGHT_BE_INFEASIBLE", justification = "False positive.")
    public static String version(String version, String timestamp) {
        if (version == null && timestamp != null) {
            return timestamp;
        } else if (version == null && timestamp == null) {
            return SNAPSHOT;
        }
        String major = null;
        String minor = null;
        String micro = null;
        String qualifier = null;
        List split = new ArrayList(Arrays.asList(version.split("\\.")));

        String[] split2 = split.get(split.size() - 1).split("\\-");
        if (split2.length > 1) {
            // We split it, so swap out the last digit
            split.remove(split.size() - 1);
            split.add(split.size(), split2[0]);
            qualifier = split2[1];
        } else if (split2.length > 0) {
            // We didn't split it
            split.remove(split.size() - 1);
            qualifier = split2[0];
        }

        if (split.size() > 0) {
            major = split.get(0);
        }
        if (split.size() > 1) {
            minor = split.get(1);
        }
        if (split.size() > 2) {
            micro = split.get(2);
        }
        if (major == null && timestamp != null) {
            // Handle the case we only have a timestamp
            return timestamp;
        }
        if (major == null && timestamp == null) {
            // Handle the case we have nothing
            return SNAPSHOT;
        }

        StringBuilder builder = new StringBuilder();
        builder.append(major);
        if (minor != null) {
            builder.append(".").append(minor);
        }
        if (minor != null && micro != null) {
            builder.append(".").append(micro);
        }
        if (qualifier != null) {
            builder.append(" (");
            if (qualifier.equals(SNAPSHOT) && timestamp != null) {
                builder.append(timestamp);
            } else {
                builder.append(qualifier);
            }
            builder.append(")");
        }
        return builder.toString();
    }

    public static String formatSimpleClassName(Object object) {
        return formatSimpleClassName(object.getClass());
    }

    public static String formatSimpleClassName(Class javaClass) {
        String simpleName = javaClass.getSimpleName();
        StringBuilder builder = new StringBuilder(simpleName.length() + 2);
        builder.append("[");
        builder.append(simpleName);
        builder.append("]");
        return builder.toString();
    }

    public static String formatAnnotatedType(AnnotatedType type) {
        return Formats.formatSimpleClassName(type) + " " + Formats.addSpaceIfNeeded(Formats.formatModifiers(type.getJavaClass().getModifiers()))
                + Formats.formatAnnotations(type.getAnnotations()) + " class " + type.getJavaClass().getName() + Formats.formatActualTypeArguments(type.getBaseType());
    }

    public static String formatAnnotatedConstructor(AnnotatedConstructor constructor) {
        return Formats.formatSimpleClassName(constructor) + " " + Formats.addSpaceIfNeeded(Formats.formatAnnotations(constructor.getAnnotations()))
                + Formats.addSpaceIfNeeded(Formats.formatModifiers(constructor.getJavaMember().getModifiers())) + constructor.getDeclaringType().getJavaClass().getName()
                + Formats.formatAsFormalParameterList(constructor.getParameters());
    }

    public static String formatAnnotatedField(AnnotatedField field) {
        return Formats.formatSimpleClassName(field) + " " + Formats.addSpaceIfNeeded(Formats.formatAnnotations(field.getAnnotations()))
                + Formats.addSpaceIfNeeded(Formats.formatModifiers(field.getJavaMember().getModifiers())) + field.getDeclaringType().getJavaClass().getName() + "."
                + field.getJavaMember().getName();
    }

    public static String formatAnnotatedMethod(AnnotatedMethod method) {
        return Formats.formatSimpleClassName(method) + " " + Formats.addSpaceIfNeeded(Formats.formatAnnotations(method.getAnnotations()))
                + Formats.addSpaceIfNeeded(Formats.formatModifiers(method.getJavaMember().getModifiers())) + method.getDeclaringType().getJavaClass().getName() + "."
                + method.getJavaMember().getName() + Formats.formatAsFormalParameterList(method.getParameters());
    }

    public static String formatAnnotatedParameter(AnnotatedParameter parameter) {
        return Formats.formatSimpleClassName(parameter) + " Parameter " + (parameter.getPosition() + 1) + " of " + parameter.getDeclaringCallable().toString();
    }

    /**
     * Attempts to extract a name of a missing class loader dependency from an exception such as {@link NoClassDefFoundError} or {@link ClassNotFoundException}.
     */
    public static String getNameOfMissingClassLoaderDependency(Throwable e) {
        if (e instanceof NoClassDefFoundError) {
            // NoClassDefFoundError sometimes includes CNFE as the cause. Since CNFE has a better formatted class name
            // and may also include classloader info, we prefer CNFE's over NCDFE's message.
            if (e.getCause() instanceof ClassNotFoundException) {
                return getNameOfMissingClassLoaderDependency(e.getCause());
            }
            if (e.getMessage() != null) {
                return e.getMessage().replace('/', '.');
            }
        }
        if (e instanceof ClassNotFoundException) {
            if (e.getMessage() != null) {
                return e.getMessage();
            }
        }
        if (e.getCause() != null) {
            return getNameOfMissingClassLoaderDependency(e.getCause());
        } else {
            return "[unknown]";
        }
    }

    public static  String formatTypeParameters(TypeVariable[] typeParams) {
        return wrapIfNecessary(formatIterable(typeParams, new Function>() {
            @Override
            public String apply(TypeVariable from, int position) {
                return spaceDelimiterFunction().apply(formatTypeVariable(from, true), position);
            }

        }), LT, GT);
    }

    private static  String formatTypeVariable(TypeVariable typeVariable, boolean simpleNames) {
        Type[] bounds = typeVariable.getBounds();
        if (Reflections.isEmptyBoundArray(bounds)) {
            return typeVariable.getName();
        }
        return typeVariable.getName() + UPPER_BOUND + formatType(bounds[0], simpleNames);
    }

    private static Properties getBuildProperties() {
        Properties buildProperties = null;
        try (InputStream in = getBuildPropertiesResource()) {
            if (in != null) {
                buildProperties = new Properties();
                buildProperties.load(in);
            }
        } catch (IOException ignored) {
        }
        return buildProperties;
    }

    private static String getManifestImplementationVersion() {
        Package pack = WeldClassLoaderResourceLoader.class.getPackage();
        if (pack == null) {
            throw new IllegalArgumentException("Package can not be null");
        }
        return pack.getImplementationVersion();
    }

    private static InputStream getBuildPropertiesResource() {
        URL url = WeldClassLoaderResourceLoader.INSTANCE.getResource(BUILD_PROPERTIES_FILE);
        try {
            return url != null ? url.openStream() : null;
        } catch (IOException e) {
            return null;
        }
    }


}
    

    

    
            
    
            







    
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