Simplify AST exploration

Author: emmanue1

src/main/java/org/jd/core/v1/model/javasyntax/expression/BaseExpression.java

@@ -61,4 +61,5 @@ public interface BaseExpression extends Base<Expression> {
     default String getName() { return ""; }
     default ObjectType getObjectType() { return ObjectType.TYPE_UNDEFINED_OBJECT; }
     default String getOperator() { return ""; }
+    default String getStringValue() { return ""; }
 }

src/main/java/org/jd/core/v1/model/javasyntax/expression/StringConstantExpression.java

@@ -24,7 +24,8 @@ public StringConstantExpression(int lineNumber, String string) {
         this.string = string;
     }
 
-    public String getString() {
+    @Override
+    public String getStringValue() {
         return string;
     }
 

src/main/java/org/jd/core/v1/service/converter/classfiletojavasyntax/util/StatementMaker.java

@@ -960,7 +960,7 @@ protected Expression createObjectTypeReferenceDotClassExpression(int lineNumber,
             }
         }
 
-        String typeName = ((StringConstantExpression) mie.getParameters()).getString();
+        String typeName = mie.getParameters().getStringValue();
         ObjectType ot = typeMaker.makeFromInternalTypeName(typeName.replace('.', '/'));
 
         return new TypeReferenceDotClassExpression(lineNumber, ot);

src/main/java/org/jd/core/v1/service/converter/classfiletojavasyntax/util/SwitchStatementMaker.java

@@ -85,7 +85,7 @@ public static void makeSwitchString(LocalVariableMaker localVariableMaker, State
                                                             break;
                                                         }
 
-                                                        String string = ((StringConstantExpression) expression).getString();
+                                                        String string = expression.getStringValue();
 
                                                         expression = stmt.getStatements().getFirst().getExpression().getRightExpression();
 

src/main/java/org/jd/core/v1/service/fragmenter/javasyntaxtojavafragment/visitor/ExpressionVisitor.java

@@ -558,7 +558,7 @@ public void visit(PreOperatorExpression expression) {
     @Override
     public void visit(StringConstantExpression expression) {
         tokens.addLineNumberToken(expression);
-        tokens.add(new StringConstantToken(StringUtil.escapeString(expression.getString()), currentInternalTypeName));
+        tokens.add(new StringConstantToken(StringUtil.escapeString(expression.getStringValue()), currentInternalTypeName));
     }
 
     @Override