Getting the name of outer class in an inner class

Hi,
I have a private inner class, something like this:
public class OuterClass extends AnotherClass {
public OuterClass() {
supre();
private class innerClass1 extends SomeotherClass {
protected void someMethod() {
// how to get the name of outer class, that is, "OuterClass"
Can someone please tell me how to get the name of the outer class inside the inner class method?
Thanks in advance..
Prasanna

getClass().getEnclosingClass().getName()But then, you already know it, don't you?

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How to get the name of a class invoking

Can a method get the name of the class invoking it?
As:
public void myMethod(){
   System.out.println("the name of the class invoking this method is: " + XXXXX);
}Edited by: Maria1990 on Aug 17, 2010 8:46 AM

Maria1990 wrote:
.getStackTrace() gives me an array with the all details.Or, if you only care about the class, ask a SecurityManager.
public final class ClassUtils {
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Getting the name of a class in the file system

Hi, im looking for a way to use the .getName() method on a class.
So say I get a file object from ("myClass.class"), how can I go from that file to getting a String of the myClass.class.getName()?
Probly a simple thing but cant find out how to do it. Thanks for any help

The name includes the package.
If you know the base directory you can translate the file name and directory into the class name and package.
If you don't know this, you have to read the class file and Objectweb's ASM is possibly the easiest.
If you want to check from the command line you can use javap to example the file to get the package name.

Getting the names of all classes

Hi,
I want to write a Java editor with code completion. Is there a way to get all the class names available in the installed Java run time environment.
Does the reflection API provides a way to do it.
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You can also look at JPDA (should be documented as part of your JDK under 'Tool Support' of the documents index), and the JDI api VirtualMachine.allClasses() method.
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How to get the name of a field without specifying it as a string (somehow v

Is it possible to get the name of a field (or method) somehow via the class in which it is declared?
The reason why I ask is, that quite often the name of a field is important, because the name is the anchor for further processing, like for example when using reflection (e.g. Class.getfield(NameOfTheField)).
Assume you have class FooSimple with the field String firstName.
Now you would do something like this:
Class<FooSimple> cls = FooSimple.class;
Field f = cls.getField("firstName");
The problem is, that the string firstName is kind of hard coded. When the name of the field in class FooSimple changes (e.g. to theFirstName), the invocation will not work anymore when you forget to change the string too.
I think it would be very helpful to have access to the name of the field directly via the class by doing something like this.
Class<FooSimple> cls = FooSimple.class;
Field f = cls.getField(FooSimple.firstName.fieldName);
The Java Compiler would then resolve FooSimple.firstName.fieldName to the string firstName. When later the name of the field is changed, the IDE would change the name everywhere where it is used. So if the name of the field would be changed to theFirstName the IDE would also change the statement to
Class<FooSimple> cls = FooSimple.class;
Field f = cls.getField(FooSimple.theFirstName.fieldName);
A technique like this would be in my opinion much more safety and more generic.
Any ideas?
Best Regards.

Well, I think the discussion is going in a wrong direction because the original issue was not to discuss if it is worth coding some helper classes or a framework or that like. Let me bring it back to my original point.
Basically you can reduce my original question to this:
Currently it is possible to use the reflection API on a class level without specifying the name of the class with a string constant.
My issue is, that I think it would be a nice extension for Java, if the same would be possible for field variables of a Java class. Currently the only way you can do this is by specifying the field variable with a string constant.
Let me bring some motivations which brought me to this issue.
Assume you have an entity bean which represents a DB table and you use Java Persistence (either JPA or something like Hibernate). Then you would have a class looking like this (very simple sample to make this reply shorter).
@Entity
@Table(name = "PERSON")
public class Person implements Serializable {
@Column(name = "NAME")
private String name;
// constructor, getter, setter, etc. not listed here
}The whole issue of the design of JPA is, that such entity beans represent the mapping between the object model and the DB model, the mapping is expressed with annotations.
Okay, now lets assume you write a query in Query Language, e.g.
String sql = select p from Person p where name = :name;name is the name of the field variable, :name is the parameter you later set with Query.setParameter method.
What is not so nice is the fact, that you use the name of the class and the name of the field variables hardcoded to construct the query. Now you could think that basically this information is part of your entity class. First you start with the name of the class (i.e. the table name) to decouple this hardcoding.
You could write instead:
String sql = select p from + Person.class.getSimpleName() + p where name = :name;This is really nice, because whenever you change the name of your Person class, this change happens automatically for the sql statement as well.
I think the next thoughts are obvious, now, since you have decoupled the hardcoded part of the name of the class, you would like to do the same for the names of the field variables. But now you are stuck, there is no way to do this using a similar technique like for the name of the class. Either you stay with the query as it is now, or, to make it a little bit better, you code string constants for the field variables and use them. This issue brought me to the point that I think it would be nice to have the possibility to get the name of a field variable in a similar way as you can get it for the name of the class.
Conceptually it is just to go one level deeper, i.e.
first level is to get the name of a class
second level is to get the name of the field variable of a class.
Another sample would be, if you want to code something by using reflection. You have perfectly access to the reflection API starting at the class level like Person.class.allTheNiceReflectionMethods. There is no need to specify the class first with a string constant first, you directly start with the class, you can even be generic and just work on the Class.class level and still have access to all these nice methods to get out the information you need.
But if you need to start with a very specific field variable (like in the sample above), you must go by using a string constant like Person.class.getDeclaredField(name).
So basically I think that there exist already millions of lines of Java code where a field variable is specified for further processing, especially in combination with the reflection functionality and everywhere the field variables are specified by these string constants in double quotes. I would assume, that everyone has the same problem, once changing the name of the field variable means to take care that also the content of the string which specifies the name of the field variable is changed.
I am wondering why one of the replies commented, why the name of a field variable is changed, it sounds to me that this is something which basically never happens. I dont know, I think that this happens actually quite often and thanks to all these nice IDEs and their rename feature this is usually no problem. From time to time names of classes change, name of field change, yes, they are often even completely rewritten, new field variables come in some are deleted, whatever it is. The way I currently can access the name of a class makes the code safer, because when I consequently go with Class.class.getSimpleName I always know, that when I rename the class all these statements are changed too If I delete such a class, I at least get a compile error.
My very simple issues is, that I think it would be nice to have the same comfort not only on a class level but also on the level of field variables, nothing more, nothing less.
To be honest, I have not browsed the forum yet if such an issue was already raised by other people (I will do this now), but somehow it is hard to imagine, that I am the first one.
Best regards.

Getting the 'name' of an XML tag

I am trying to get the 'name' value out of an XML tag. Here is the XML that I am parsing:
<param name="param_name">param_value</param>
I can get the values 'param' and 'param_value' using the node.getNodeName() and the node.getNodeValue() methods.
I need the value of "param_name" though because in the situation that I am in, this is how the node values are determined.
Any thoughts? Thanks in advance!

Hello,
"name" is called an attribute of the "param" element. You could try to take a look at the getAttributes() function (node.getAttributes().item(0)).
I hope it helps.

How to programmatically get the source for a class provided the class name?

Hello,
As a quick background, I am providing some tools to potential users of an in-house framework. One is the ability to generate quick prototypes from our existing demo applications. Assume a user downloads our jars and uses them in their project (we are using Eclipse, but that detail should not greatly affect my question). Included in the jars is a demos package that contains ready-to-run classes that serve to exhibit certain functionality. Since many users may just need quick extensions of these demos, I am trying to provide a way for them to be able to create a new project that starts with a copy of the demo class.
So, the user is provided a list of the existing demos (each one uses a single class). When the user makes their selection, with the knowledge of our framework, I can translate that into what demo class they need (returned as a string of format package.subpack1.subpackn.DemoClassName). What I now want to do is to use that complete class name to get the source (look up the file) for the corresponding class, and copy it into to a new file in their project (the copying into the project can be done easily in Eclipse, so what I need help with is the bolded part). Is there a simple way to get the source given a class path for a class as described above? You may assume the source files are included in the jars for the framework.
Thanks in advance.

If there's a file named "package.subpack1.subpackn.DemoClassName.java" in a "demos" directory in the jar, then yes. You'd just use
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InputStream code = getResourceAsStream("/demos/package/subpack1/subpackn/DemoClassName.java");

How to get the name of the class which is currently in use

Hi all,
I have two classes Mother and Child, and I use this code to print the name of the class in use
DATA m TYPE REF TO zmother.
DATA class_name type string VALUE 'CHILD'.
CREATE OBJECT m TYPE (class_name).
CALL METHOD m->PrintName .
So, what is the source code that I have to put in the PrintName methode?
Thanks.

Ok, but how can I get the name of the object class that calls the methode!
REPORT ztest_method.
*       CLASS c1 DEFINITION
CLASS c1 DEFINITION.
PUBLIC SECTION.
    METHODS: get_data.
ENDCLASS.                    "c1 DEFINITION
*       CLASS c1 IMPLEMENTATION
CLASS c1 IMPLEMENTATION.
METHOD get_data.
****** What is the code to put here to know the name of this Class?*
ENDMETHOD.                    "get_data
ENDCLASS.                    "c1 IMPLEMENTATION
DATA oref TYPE REF TO object.
DATA: method TYPE string.
DATA: cla_name(20).
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Getting the name of a calling Class

Hi,
Is there anyway I can get the name of the Class that calls a Class in the Class that is being called?
Cheers
SS

write this into your called class
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Search a string with in some file and get the name of file

i want to search a string in some files that are in a given directory and return the name of file having searched string.I am doing this with grep command as given below
import java.io.*;
public class linux_java {
public static void main(String[] args) {
try {
String command = "find . | xargs grep -l Resolv /data2/opt/jakarta-tomcat-4.1.24/webapps/Oa/BOG/*.txt";
final Process process = Runtime.getRuntime().exec(command);
OutputStream os= process.getOutputStream();
System.out.println("out put stream= " +os);
PrintStream stdIn = new PrintStream(new BufferedOutputStream(process.getOutputStream()), true);
System.out.println("Return code = " + stdIn);
} catch (Exception e) {
e.printStackTrace();
i dont know how to get the name of file that are return by the execution of command through process object. Please send the code for the same

thanks for your suggestion....
i change the code but now it is giving error as /usr/bin/find incomplete syntax....but i am giving the right syntax....
please confirm whether the syntax is correct...
import java.io.*;
import java.util.*;
public class linux_java {
public static void main(String[] args) {
try {
//String command = "ls -alt";
String command = "find /data2/opt/jakarta-tomcat-4.1.24/webapps/Oa/BOG -type f -exec grep -sl 'Aggarwal' {} \\; 2>/dev/null";
///grep -l System test/*java
System.out.println(" the command is"+command);
final Process process = Runtime.getRuntime().exec(command);
InputStream is = process.getErrorStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line="";
System.out.println(" the BufferedReader is"+br.readLine());
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} catch (Exception e) {
e.printStackTrace();
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Getting the name of a menu from the menu item

Hi everybody,
I'm trying to get the name of the menu that a particular menu item is classified under, and thus far I can't figure out how. Can anyone give me a hand with this, please? I have a SSCCE that describes my efforts so far:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
public class MenuTester {
     public MenuTester() {
          JMenuItem item = new JMenuItem( "zzz" );
          item.addActionListener( new ActionListener() {
               public void actionPerformed( ActionEvent e ) {
                    System.out.println( ((JPopupMenu)((JMenuItem)e.getSource()).getParent()).getLabel() );
                    System.out.println( ((JPopupMenu)((JMenuItem)e.getSource()).getParent()).getName() );
          JMenu menu = new JMenu( "test" );
                menu.setName( "test" );
          menu.add( item );
          JMenuBar bar = new JMenuBar();
          bar.add( menu );
          JFrame frame = new JFrame();
          frame.setJMenuBar( bar );
          frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
          frame.setSize( 300, 300 );
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}I've tried the JPopupMenu method getLabel, and the generic Component method getName, but neither of them seem to work, even when I explicitly set the name. The result of both calls is "null", not "test" as it should be. There must be something small that I'm missing, but I'm not sure what, can anyone please tell me what it is?
Thanks,
Jezzica85

JMenuItem mi = (JMenuItem)e.getSource();
JPopupMenu popup = (JPopupMenu)mi.getParent();
JMenu menu = (JMenu)popup.getInvoker();
System.out.println( menu.getText() );

How to get the attribute values out?

Hi everyone,
<root>
<category name="Mens Clothing" id="0">
<subcategory>Active/Baselayer Tops</subcategory>
<subcategory>Active/Baselayer
Bottoms</subcategory>
</category>
<category name="Womens Clothing" id="1">
<subcategory>aaa</subcategory>
<subcategory>bbb</subcategory>
</category>
</root>
How to get the attribute values out? For example "Mens
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// the line below returns "Active/Baselayer Tops" and
"Active/Baselayer Bottoms"
var myXml:XML = new XML(event.result);
Thanks,
May

Here is attribute identifier operator from FB Help:
@ attribute identifier Operator
Usage myXML.@attributeName
Identifies attributes of an XML or XMLList object. For
example, myXML.@id identifies attributes named id for the myXML XML
object. You can also use the following syntax to access attributes:
myXML.attribute("id"), myXML["@id"], and myXML.@["id"]. The syntax
myXML.@id is recommended. To return an XMLList object of all
attribute names, use @*. To return an attribute with a name that
matches an ActionScript reserved word, use the attribute() method
instead of the @ operator.
Operands attributeName:* — The name of the attribute.
Example
How to use examples
The first example shows how to use the @ (at sign) operator
to identify an attribute of an element:
var myXML:XML =
<item id = "42">
<catalogName>Presta tube</catalogName>
<price>3.99</price>
</item>;
trace(myXML.@id); // 42The next example returns all attribute
names:
var xml:XML =<example id='123' color='blue'/>
var xml2:XMLList = xml.@*;
trace(xml2 is XMLList); // true
trace(xml2.length()); // 2
for (var i:int = 0; i < xml2.length(); i++)
trace(typeof(xml2
)); // xml
trace(xml2.nodeKind()); // attribute
trace(xml2
.name()); // id and color
} The next example returns an attribute with a name that
matches a reserved word in ActionScript. You cannot use the syntax
xml.@class (since class is a reserved word in ActionScript). You
need to use the syntax xml.attribute("class"):
var xml:XML = <example class='123'/>
trace(xml.attribute("class"));

How to get the name and value of an attribute on a node/element that is not a child

Hello,
Can someone shed some wisdom on how I can compare 2 xml nodes for differences.
My main challenge is I need to use the attributes/values of 'ProductDescription' and 'Features' as 'key' to identify the same node in
another doc with the same layout, but different content.
I am having trouble getting the name of the attribute on the node, 'ProductDescription' and 'Features'. I can only seem to get the node names, but not the attributes on the node. I need the name, because it can be different from doc to doc, so
I can't hardcode this.
Can someone please help with how to retrieve an attribute name/value on a node that is not a child. Here's an example of what
my xml looks like:
DECLARE
@myDoc1 xml
,@mydoc2 xml
DECLARE
@ProdID int
SET @myDoc1 ='<ProductDescription ProductID="1" ProductName="Road Bike">
<Features featureID = "1" featureName = "body">
<Warranty>1 year parts and labor</Warranty>
<Maintenance>3 year parts and labor extended maintenance is available</Maintenance>
</Features>
<features featureID = "2" featureName = "seat">
<Warranty>1 year parts and labor</Warranty>
<Maintenance>2 year parts and labor extended maintenance is available</Maintenance>
</Features>
</ProductDescription>
SET @myDoc2 ='<ProductDescription ProductID="1" ProductName="Road Bike">
<Features featureID = "1" featureName = "body">
<Warranty>2 year parts and labor</Warranty>
<Maintenance>3 year parts and labor extended maintenance is available</Maintenance>
</Features>
<features featureID = "2" featureName = "wheel">
<Warranty>1 year parts and labor</Warranty>
<Maintenance>2 year parts and labor extended maintenance is available</Maintenance>
</Features>
</ProductDescription>
I need to compare the attributes of 'ProductDescription' and 'Features' from @mydoc1 against @mydoc2 to see if they are the same based on those 2 nodes first. If they are, then i want to show the difference in the child elements.
This will eventually be an outer join to give me the differences betw the 2 docs based on those key values (node attributes).
I used node('//*') for the path, and value('local-name(../.)', 'varchar(50)') as element
,value('.[not(@xsi:nil = "true")]','VARCHAR(255)') AS new_value
...etc...
but that only gives me the node names, and the child elements. It does not give me back the attribute names and values from the node itself.
Thanks in advance for your help.
cee

Are you looking for something like this:
DECLARE @myDoc1 xml
SET @myDoc1 ='<ProductDescription ProductID="1" ProductName="Road Bike">
<Features featureID = "1" featureName = "body">
<Warranty>1 year parts and labor</Warranty>
<Maintenance>3 year parts and labor extended maintenance is available</Maintenance>
</Features>
<Features featureID = "2" featureName = "seat">
<Warranty>1 year parts and labor</Warranty>
<Maintenance>2 year parts and labor extended maintenance is available</Maintenance>
</Features>
</ProductDescription>'
SELECT T.c.value('local-name(.)', 'nvarchar(50)') AS name,
T.c.value('.', 'nvarchar(50)') AS value
FROM @myDoc1.nodes('ProductDescription/@*') AS T(c)
Erland Sommarskog, SQL Server MVP, [email protected]

How get controls name from a class private data?

How can i get the names of the controls inside a class private data?
I am using Actor Framework and trying to create a method tha will be executed when launch the actor. This method need a list o all the control names inside the class data to search for the initial value inside a configuration file (config.ini), the key on the configuration file will be the name of the control.
Thanks.
Solved!
Go to Solution.

You are already making the overriding method just because you have to write to the Bundle By Name. And then how are you going to handle all of the data types the keys could be. You are making things more difficult than it should be for really very little benefit.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

How to get the name of tag or variable

Hi everyone,
I am a newbie, I have problem on getting the name or tag of the variable from OLE for Processing Control(OPC) server, could anyone tell me how I can get the name of tag or variable from writting vb codes or please direct me to any helpful information. Here are
my codes,
Dim ItemsDef(NBR_ITEMS) As String
Dim DeviceAddress As String
Dim IndItem As Long
DeviceAddress = "MBT:152.160.178.60"
'Preparing the Handles for "AddItems"
For IndItem = 1 To NBR_ITEMS
ItemsDef(IndItem) = DeviceAddress & "!40000" & Format(IndItem) '40000 is the memory location of variable in the OPC, how can I get the variable name, what is the code or syntax?
Next
blah...
Thank you,
Calvin

Hi Calvin,
If you are looking for general information and examples about OPC, then we have lots of places for you to browse!
Here is a small list, and you can probably find other links within these documents:
**If you have Measurement Studio from National Instruments, then you can look at the "Measurement Studio Reference" help file. Search for OPC and in the overview you will find the methods for accessing the items on an OPC server.
**Elsewhere in the help file, you can find a link to this Application Note on our developer zone
http://zone.ni.com/devzone/devzoneweb.nsf/opendoc?openagent&F4921B34CA8F4A9786256874005BE3F7&cat=7CDA3E51FEFC4AA2862568B80071A1E2
**One more resource is http://www.ni.com/opc
**Probably the most useful will be the examples yo
u can find on our web site. You can go to http://www.ni.com/support and in Option 3 search the Example Code database for "opc".
In the first example program (Controlling OPC Servers with the OPC Automation API in Visual Basic) that you should get when searching for "opc" in the example programs database, look for the line with this code: "browser.GetItemID(leaf)". There you can see the way the program creates an OPCBrowser from the server instance, and then gets the servers available items for use by the client. This sounds like the specific information you are looking for with the variable name.
If you aren't able to find out your answer here or in the various help resources, then please feel free to contact us at National Instruments at http://www.ni.com/ask
Regards,
John N
Applications Engineer
National Instruments

Getting the name of outer class in an inner class

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