Depends on the version of GWT, but here&#39;s the latest: https://gwt.googlesource.com/gwt/+/master/user/src/com/google/gwt/useragent/UserAgent.gwt.xml

**UPDATE**: the module has moved from `com.google.gwt.user.UserAgent` to `com.google.gwt.useragent.UserAgent`, link above updated.

**UPDATE 2**: GWT sources have moved to gwt.googlesource.com

The following is said to be better than having First() and Second() as public members. I believe this is nearly as bad.

    // Example 17-3(b): Proper encapsulation, initially with inline accessors. Later
    // in life, these might grow into nontrivial functions if needed; if not, then not.
    
    template&lt;class T, class U&gt;
    class Couple {
    public:
      Couple()           : deleted_(false) { }
      void MarkDeleted() { deleted_ = true; }
      bool IsDeleted()   { return deleted_; }
    
    private:
     T first_;
     U second_;
     bool deleted_;
     T&amp; First()         { return first_; }
     U&amp; Second()        { return second_; }
    };

If you&#39;re giving a way to access a private variable outside of the class then what&#39;s the point? Shouldn&#39;t the functions be

    T First(); void(or T) First(const T&amp;)

Is returning references of member variables bad practice?

In JS if you would like to split user entry into an array what is the best way of going about it? 

For example:

    entry = prompt(&quot;Enter your name&quot;)
    
    for (i=0; i&lt;entry.length; i++)
    {
    entryArray[i] = entry.charAt([i]);
    }

    // entryArray=[&#39;j&#39;, &#39;e&#39;, &#39;a&#39;, &#39;n&#39;, &#39;s&#39;, &#39;y&#39;] after loop


Perhaps I&#39;m going about this the wrong way - would appreciate any help!


Split string into array

I was wondering what are the possible user.agent values in gwt.xml. I found some of them but unfortunately not the complete list.&lt;p&gt;

 - Chrome - safari
 - Firefox - gecko1_8
 - Internet Explorer 6 - ie6 

What are the others?? Opera, ie7, ie8, ... etc.



What are the possible user.agent values in gwt.xml?

I was wondering what are the possible user.agent values in gwt.xml. I found some of them but unfortunately not the complete list.
<ul>
<li>Chrome - safari</li>
<li>Firefox - gecko1_8</li>
<li>Internet Explorer 6 - ie6</li>
</ul>
What are the others?? Opera, ie7, ie8, ... etc.

How do I avoid this hardcoded math...

    &lt;resources&gt;
     &lt;dimen name=&quot;uno&quot;&gt;10dip&lt;/dimen&gt;
     &lt;dimen name=&quot;dos&quot;&gt;6dip&lt;/dimen&gt;
     &lt;dimen name=&quot;uno_plus_dos&quot;&gt;16dip&lt;/dimen&gt;
    &lt;/resources&gt;
    
    &lt;Button 
     android:layout_marginTop=&quot;@dimen/uno_plus_dos&quot; /&gt;

...and covert it to something like this?

    &lt;Button
     android:layout_marginTop=&quot;@dimin/uno + @dimen/dos&quot; /&gt;

How do I apply mathematical operations to Android dimensions?

I am new to YAML and have been searching for ways to parse a YAML file and use/access the data from the parsed YAML. 

I have come across explanations on how to parse the YAML file, for example, the PyYAML [tutorial][1], &quot;https://stackoverflow.com/questions/1773805/best-way-to-parse-a-yaml-file&quot;, &quot;https://stackoverflow.com/questions/1305532/convert-python-dict-to-object&quot;, but what I haven&#39;t found is a simple example on how to access the data from the parsed YAML file. 

Assume I have a YAML file such as:

     treeroot:
         branch1: branch1 text
         branch2: branch2 text

How do I access the text &quot;branch1 text&quot;?

&quot;https://stackoverflow.com/questions/6866600/yaml-parsing-and-python&quot; provides a solution, but I had problems accessing the data from a more complex YAML file.  And, I&#39;m wondering if there is some standard way of accessing the data from a parsed YAML file, possibly something similar to &quot;[tree iteration][2]&quot; or &quot;[elementpath][3]&quot; notation or something which would be used when parsing an XML file?

[1]: http://pyyaml.org/wiki/PyYAMLDocumentation#Tutorial
[2]: http://lxml.de/tutorial.html#tree-iteration
[3]: http://lxml.de/tutorial.html#elementpath


Parsing a YAML file in Python, and accessing the data?

I&#39;m trying to query an xml file generated by adium. xmlwf says that it&#39;s well formed. By using xmllint&#39;s debug option i get the following:

    $ xmllint --debug doc.xml
    DOCUMENT
    version=1.0
    encoding=UTF-8
    URL=doc.xml
    standalone=true
      ELEMENT chat
        default namespace href=http://purl.org/net/ulf/ns/0.4-02
        ATTRIBUTE account
          TEXT
            content=foo@bar.com
        ATTRIBUTE service
          TEXT compact
            content=MSN
        TEXT compact
          content= 
        ELEMENT event
          ATTRIBUTE type

Everything seems to parse just fine. However, when I try to query even the simplest things, I don&#39;t get anything:

    $ xmllint --xpath &#39;/chat&#39; doc.xml 
    XPath set is empty

What&#39;s happening? Running that exact same query using xpath returns the correct results (however with no newline between results). Am I doing something wrong or is xmllint just not working properly?

Here&#39;s a shorter, anonymized version of the xml that shows the same behavior:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; ?&gt;
    &lt;chat xmlns=&quot;http://purl.org/net/ulf/ns/0.4-02&quot; account=&quot;foo@bar.com&quot; service=&quot;MSN&quot;&gt;
    &lt;event type=&quot;windowOpened&quot; sender=&quot;foo@bar.com&quot; time=&quot;2011-11-22T00:34:43-03:00&quot;&gt;&lt;/event&gt;
    &lt;message sender=&quot;foo@bar.com&quot; time=&quot;2011-11-22T00:34:43-03:00&quot; alias=&quot;foo&quot;&gt;&lt;div&gt;&lt;span style=&quot;color: #000000; font-family: Helvetica; font-size: 12pt;&quot;&gt;hi&lt;/span&gt;&lt;/div&gt;&lt;/message&gt;
    &lt;/chat&gt;

xmllint failing to properly query with xpath

I have a string that contains invalid XML characters. How can I escape (or remove) invalid XML characters before I parse the string?

Escape invalid XML characters in C#

I want to serialize an object to XML, but I don&#39;t want to save it on the disk. I want to hold it in a XElement variable (for using with LINQ), and then Deserialize back to my object.

How can I do this?

Serialize an object to XElement and Deserialize it in memory

I am trying to run GWT RequestFactory and facing this error:

    ClassNotFoundException: org.slf4j.LoggerFactory

I have tried to download *slf4j-api-1.3.1.jar* but it didnt resolve the issue 

Any idea exactly which jar I need to download ?

ClassNotFoundException: org.slf4j.LoggerFactory

I am debugging a GWT application and I need to print some stuff to the console for testing purposes. `System.out.println` and `GWT.log` don&#39;t work. Does anyone have any ideas?

How to print to the console in GWT

I am trying to make a get request from the GWT servlet to get JSON response from a web service.
Following is the code in my servlet :

    public String getQueData() throws IllegalArgumentException {
        String message = null;
        try {		    
            HttpClient httpclient = new DefaultHttpClient(); 
            JSONParser parser = new JSONParser();
    
            String url = &quot;working - url&quot;;
            HttpResponse response = null;
            response = httpclient.execute(new HttpGet(url));
    
            JSONObject json_data = null;
            json_data = (JSONObject)parser.parse(EntityUtils.toString(response.getEntity()));
            JSONArray results = (JSONArray)json_data.get(&quot;result&quot;);
            for (Object queid : results) {
                message = message.concat((String) ((JSONObject)queid).get(&quot;id&quot;));
                message = message.concat(&quot;\t&quot;);
                message = message.concat((String) ((JSONObject)queid).get(&quot;owner&quot;));
                message = message.concat(&quot;\n&quot;);
            }
          } catch (Exception e) {
        message = e.toString();
        }
        return message;
    }

Getting the following exception on trying to make get request from a GWT servlet.

    java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient
    	at java.lang.Class.getDeclaredConstructors0(Native Method)
    	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
    	at java.lang.Class.getConstructor0(Class.java:2699)
    	at java.lang.Class.newInstance0(Class.java:326)
    	at java.lang.Class.newInstance(Class.java:308)
    	at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
    	at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:428)
    	at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
    	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    	at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    	at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78)
    	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    	at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:362)
    	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    	at org.mortbay.jetty.Server.handle(Server.java:326)
    	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
    Caused by: java.lang.ClassNotFoundException: org.apache.http.client.HttpClient
    	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    	at java.security.AccessController.doPrivileged(Native Method)
    	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    	at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)


What could be the possible cause of this exception?
How it could be removed?

I am using jdk1.6.0_30 on ubuntu 10.04.

java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient

I would like my webpage&#39;s *viewport width* to equal *device-width* as long as *device-width* &gt; 450px, or 450px otherwise (my layout dynamically scales, but doesn&#39;t look good below 450px wide).

The following two meta tags work well on tablets, where the device-width &gt; 450px:

    &lt;!-- uses device width --&gt;
    &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width&quot; /&gt;

    &lt;!-- use of initial-scale means width param is treated as min-width --&gt;
    &lt;meta name=&quot;viewport&quot; content=&quot;width=450, initial-scale=1.0&quot; /&gt;
		
however, on phones (where e.g. device-width=320px) the former is too thin for the content; and the latter causes the browser to zoom in, so the user has to manually zoom out to see the content.

Alternatively, this meta tag works well on phones

    &lt;meta name=&quot;viewport&quot; content=&quot;width=450&quot; /&gt;
	
but doesn&#39;t take advantage of the extra width available on tablets.

Any help/ideas would be really appreciated (and if it makes a difference, I&#39;m using GWT).

Achieving min-width with viewport meta tag

When browsing the source code of Guava, I came across the following piece of code (part of the implementation of `hashCode` for the inner class `CartesianSet`):

    int adjust = size() - 1;
    for (int i = 0; i &lt; axes.size(); i++) {
        adjust *= 31;
        adjust = ~~adjust;
        // in GWT, we have to deal with integer overflow carefully
    }
    int hash = 1;
    for (Set&lt;E&gt; axis : axes) {
        hash = 31 * hash + (size() / axis.size() * axis.hashCode());

        hash = ~~hash;
    }
    hash += adjust;
    return ~~hash;

Both of `adjust` and `hash` are `int`s. From what I know about Java, `~` means bitwise negation, so `adjust = ~~adjust` and `hash = ~~hash` should leave the variables unchanged. Running the small test (with assertions enabled, of course),

    for (int i = Integer.MIN_VALUE; i &lt; Integer.MAX_VALUE; i++) {
        assert i == ~~i;
    }

confirms this. Assuming that the Guava guys know what they are doing, there must be a reason for them to do this. The question is what?

**EDIT** As pointed out in the comments, the test above doesn&#39;t include the case where `i` equals `Integer.MAX_VALUE`. Since `i &lt;= Integer.MAX_VALUE` is always true, we will need to check that case outside the loop to prevent it from looping forever. However, the line

    assert Integer.MAX_VALUE == ~~Integer.MAX_VALUE;

yields the compiler warning &quot;Comparing identical expressions&quot;, which pretty much nails it.

What is the meaning of double tilde (~~) in Java?

In JavaScript we have a few ways of getting the properties of an object, depending on what we want to get. 

1) `Object.keys()`, which returns all own, enumerable properties of an object, an ECMA5 method.

2) a `for...in` loop, which returns all the enumerable properties of an object, regardless of whether they are own properties, or inherited from the prototype chain.

3) `Object.getOwnPropertyNames(obj)` which returns all own properties of an object, enumerable or not.

We also have such methods as `hasOwnProperty(prop)` lets us check if a property is inherited or actually belongs to that object, and `propertyIsEnumerable(prop)` which, as the name suggests, lets us check if a property is enumerable.

With all these options, there is no way to get a **non-enumerable, non-own** property of an object, which is what I want to do. Is there any way to do this? In other words, can I somehow get a list of the inherited non-enumerable properties?

Thank you.

Is it possible to get the non-enumerable inherited property names of an object?

I&#39;d like to declare a property with type `SEL` like this:

    @property (nonatomic, assign) SEL mySelector;

Is &quot;`assign`&quot; correct here? Perhaps `assign` can be omitted?

Property with type SEL in Objective-c

I&#39;m currently setting all of the values of my class object `Record`.

This is the code that I&#39;m using to populate the record at the moment, property by property.

    // Loop through each field in the result set
    for (int i = 0; i &lt;= resultItems.Length; i++)
    {
    
        Record newRecord = new Record()
        {
                itemtype =   resultItems[i - (fieldCount - 0)],
                itemdesc =   resultItems[i - (fieldCount - 1)],
                prodcode =   resultItems[i - (fieldCount - 2)],
                proddesc =   resultItems[i - (fieldCount - 3)],
                curstat =    resultItems[i - (fieldCount -4)],
                totfree =    resultItems[i - (fieldCount -5)],
                totphys =    resultItems[i - (fieldCount -6)],
                pcolgroup =  resultItems[i - (fieldCount -7)],
                scolgroup =  resultItems[i - (fieldCount -8)],
                totpo =      resultItems[i - (fieldCount - 9)],
                totso =      resultItems[i - (fieldCount - 10)],
                quality =    resultItems[i - (fieldCount - 11)],
                statusdesc = resultItems[i - (fieldCount - 12)],
                groupcode =  resultItems[i - (fieldCount - 13)],
                qualitydes = resultItems[i - (fieldCount - 14)],
                pcoldesc =   resultItems[i - (fieldCount - 15)],
                scoldesc =   resultItems[i - (fieldCount - 16)],
                pgroupdesc = resultItems[i - (fieldCount - 17)],
        };
    }

Can I iterate through each of the properties dynamically without hard coding all of the property names?

Something like so:

    // Create new Record instance
    Record newRecord = new Record();

    for (int e = 0; e &lt; propertyCount.Length - 1; e++)
    {
        newRecord[fieldname] = resultItems[i - (fieldCount - e)];
    }

C# Iterate through Class properties

I have the following code trying to read a properties file:

    Properties prop = new Properties();
    ClassLoader loader = Thread.currentThread().getContextClassLoader();           
    InputStream stream = loader.getResourceAsStream(&quot;myProp.properties&quot;);
    prop.load(stream);

I get an exception at the last line. Specifically:

    Exception in thread &quot;main&quot; java.lang.NullPointerException
	at java.util.Properties$LineReader.readLine(Properties.java:418)
	at java.util.Properties.load0(Properties.java:337)
	at java.util.Properties.load(Properties.java:325)
	at Assignment1.BaseStation.readPropertyFile(BaseStation.java:46)
	at Assignment1.BaseStation.main(BaseStation.java:87)

thanks,
Nikos

Reading Properties file in Java

I have this Base class:

    abstract class Base
    {
      public int x
      {
        get { throw new NotImplementedException(); }
      }
    }

And the following descendant:

    class Derived : Base
    {
      public int x
      {
        get { //Actual Implementaion }
      }
    }


 When I compile I get this warning saying Derived class&#39;s definition of `x` is gonna hide Base&#39;s version of it. Is is possible to override properties in c# like methods?

Content Type	Original Author	Original Content on Stackoverflow
Question	Kayser	View Question on Stackoverflow
Solution 1 - Xml	Thomas Broyer	View Answer on Stackoverflow

What are the possible user.agent values in gwt.xml?

Xml Problem Overview

Xml Solutions

Solution 1 - Xml

Split string into array

Is returning references of member variables bad practice?

Attributions