fix! improve getNamePrefix to avoid cast errors

package es.upv.mist.slicing.nodes;

import com.github.javaparser.ast.Node;

import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;

import com.github.javaparser.ast.body.FieldDeclaration;

import com.github.javaparser.ast.body.Parameter;

import com.github.javaparser.ast.body.VariableDeclarator;

import com.github.javaparser.resolution.Resolvable;

import com.github.javaparser.resolution.UnsolvedSymbolException;

import com.github.javaparser.resolution.declarations.ResolvedMethodLikeDeclaration;

import com.github.javaparser.resolution.declarations.ResolvedTypeDeclaration;

import com.github.javaparser.resolution.declarations.ResolvedValueDeclaration;

import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserFieldDeclaration;

import es.upv.mist.slicing.graphs.GraphNodeContentVisitor;

import es.upv.mist.slicing.utils.ASTUtils;

import es.upv.mist.slicing.utils.Logger;

        if (!resolved.isField() || resolved.asField().isStatic())

            return "";

        // Obtain the class where the field is declared and the current class

        JavaParserFieldDeclaration field = (JavaParserFieldDeclaration) resolved.asField();

        Node decClass = ASTUtils.getClassNode(field.getVariableDeclarator());

        Node nClass = ASTUtils.getClassNode(n);

        ResolvedTypeDeclaration declaringType = resolved.asField().declaringType();

        ResolvedTypeDeclaration containerType = ASTUtils.getClassNode(n).resolve();

        // If the classes match, the prefix can be simplified

        if (decClass.equals(nClass))

        if (Objects.equals(declaringType, containerType))

            return "this.";

        // Full prefix

        return ((ClassOrInterfaceDeclaration) decClass).getNameAsString() + ".this.";

        return declaringType.getClassName() + ".this.";

    }

}

    }

    /** Given an AST node, visit the parent until finding a ClassOrInterfaceDeclaration */

    public static Node getClassNode(Node n){

    public static ClassOrInterfaceDeclaration getClassNode(Node n){

        Node upperNode = n;

        while (!(upperNode instanceof ClassOrInterfaceDeclaration))

            upperNode = upperNode.getParentNode().orElseThrow();

        return upperNode;

        return (ClassOrInterfaceDeclaration) upperNode;

    }

}