March 26th, 2010 in java | No Comments »
Reading files from WEB-INF in JSF
This no different than reading files from a Servlet except it involves a extra step of getting ServletContext from FacesContext
FacesContext context = FacesContext.getCurrentInstance();
ExternalContext externalContext = context.getExternalContext();
ServletContext sc = (ServletContext)externalContext.getContext();
String sc.getRealPath("/WEB-INF/somefile.xml");Here we are getting the path to the file but you could read it if you like.
March 18th, 2010 in java | No Comments »
While playing around with JavaXPCOM I have run into couple issues. I am running on window 7 64 bit.
When trying to initialize my GRE (Gecko Runtime Environment) I got following exception
Exception in thread "main" java.lang.UnsatisfiedLinkError: D:\xulrunner-sdk\bin\javaxpcomglue.dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1803)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1699)
at java.lang.Runtime.load0(Runtime.java:770)
at java.lang.System.load(System.java:1003)
at org.mozilla.xpcom.internal.JavaXPCOMMethods.registerJavaXPCOMMethods(JavaXPCOMMethods.java:57)
at org.mozilla.xpcom.internal.MozillaImpl.initialize(MozillaImpl.java:48)
at org.mozilla.xpcom.Mozilla.initialize(Mozilla.java:668)
at SampleBroswer.init(SampleBroswer.java:69)
at SampleBroswer.main(SampleBroswer.java:45)
What is strange on my other dev machine same configuration I don’t have this problem, very strange.
Problem is that the file mozcrt19.dll can’t be found. So what I did is that I copied that file from xulrunner-sdk\bin to my C:\Windows\SysWOW64 folder and that fixed the problem. Still little puzzled over why my other machine is not throwing this exception.
September 30th, 2009 in java | No Comments »
There is couple ways about doing that, you could use JBoss EL expression implementation they support method calls with parameters check out Seam, or use similar approach as @digitaljoel suggested.
This is what I created for that purpose, you can call static and static methods, not a great solution but it does the job.
<c:if test="#{t:call(null, '@Util.SecurityUtility', 'isPanelWorkbookEnabledForUser','')}">
Hello Panel
</c:if>@Util is just an alias to com.mycomp.util where
**Example 2**
<c:if test="#{item != null and t:call(item, 'java.lang.String', 'indexOf', t:params(t:param('flash-alert',''))) == 0}">
#{t:call(session, 'org.apache.catalina.session.StandardSessionFacade', 'removeAttribute', t:params(t:param(item,'')))}
</c:if>t:call, t:params, t:param are function defined in project-taglib.xml as so
<function>
<function-name>call</function-name>
<function-class>util.Functions</function-class>
<function-signature>java.lang.Object call(java.lang.Object, java.lang.String, java.lang.String, java.lang.Object[])</function-signature>
</function>
<function>
<function-name>param</function-name>
<function-class>.util.Functions</function-class>
<function-signature>java.lang.String param(java.lang.Object, java.lang.String)</function-signature>
</function>
<function>
<function-name>params</function-name>
<function-class>util.Functions</function-class>
<function-signature>java.lang.Object[] params(java.lang.String)</function-signature>
</function>
Here is the implementation
package mycompany.web.util;
import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.StringWriter;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import javax.el.MethodNotFoundException;
public class Functions {
private static HashMap<String, String> alliasMap;
static{
alliasMap=new HashMap<String, String>();
alliasMap.put("@DateUtil", "com.americanbanksystems.compliance.util.DateUtil");
//Match anything following the dot(.)
alliasMap.put("@Util.*", "com.americanbanksystems.compliance.util");
alliasMap.put("@Application.*", "com.americanbanksystems.compliance.application");
}
public static String param(Object obj, String cls) {
//make sure that passed in object is not null
if(obj==null){
obj="";
}
ByteArrayOutputStream baut=new ByteArrayOutputStream();
XMLEncoder encoder=new XMLEncoder( baut );
//Bug in the JDK
//http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=c993c9a3160fd7de44075a2a1fa?bug_id=6525396
if(obj instanceof java.sql.Timestamp){
Date o = new Date(((java.sql.Timestamp)obj).getTime());
obj=o;
}
//Checking if this is possible
if(String.class.isAssignableFrom(obj.getClass())){
//removed trailing +" " because it was causing indexOf return invalid value
//Unknown side effects
obj=FacesUtil.get(obj.toString());
}
encoder.writeObject( obj );
encoder.close();
return new String(baut.toByteArray());
}
private static Object decode(String str){
ByteArrayInputStream bais=new ByteArrayInputStream(str.getBytes());
XMLDecoder decoder=new XMLDecoder(bais);
return decoder.readObject();
}
public static Object[] params(String str){
// (?<=</java>)\s*(?=<?)
String[] obj=str.split("(?<=</java>)\\s*(?=<?)");
Object[] results=new Object[obj.length];
for(int i=0;i<obj.length;i++){
results[i]=decode(obj[i]);
}
return results;
}
@SuppressWarnings("unchecked")
public static Object call(Object owningObject, String qualifiedClassname, String methodName, java.lang.Object... methodArguments) {
if (null == methodName || methodName.equals("")) {
throw new IllegalArgumentException("Method name can't be null or empty");
}
if (null == methodArguments) {
methodArguments = new Object[0];
}
//Check for aliases
if(qualifiedClassname.indexOf("@")>-1){
String subpackage=qualifiedClassname;
String originalClass=qualifiedClassname;
//Split at the dot
boolean isPackageAllias=false;
String[] sp=subpackage.split("\\.");
if(sp.length>1){
subpackage=sp[0]+".*";
isPackageAllias=true;
}
if(alliasMap.containsKey(subpackage)){
String value = alliasMap.get(subpackage);
if(isPackageAllias){
qualifiedClassname=subpackage.replace(sp[0], value);
qualifiedClassname=qualifiedClassname.replace(".*", originalClass.replace(sp[0],""));
}else{
qualifiedClassname=value;
}
}else{
throw new IllegalArgumentException("Allias name '"+qualifiedClassname+"' not found");
}
}
Class clazz;
try {
clazz = Class.forName(qualifiedClassname);
//Find method by methodName,Argument Types
Class[] argumentTypes=new Class[methodArguments.length];
for(int i=0;i<methodArguments.length;i++){
argumentTypes[i]=methodArguments[i].getClass();
//Check if the passed in method argument is a string and if its represented as unicode char
//if it is then convert it into a char and reassign to the original parameter
//example 1: \u0022 == "
//example 2: \u0027 == '
// Reason for this functionality is that we can't pass " and ' from within t:call method
if (argumentTypes[i] == String.class && methodArguments[i].toString().indexOf("\\u") > -1) {
String arg = methodArguments[i].toString();
arg = arg.substring(2, arg.length());
try {
int outchar = Integer.parseInt(arg, 16);
if (Character.isDefined(outchar)) {
methodArguments[i] = String.valueOf((char) outchar);
}
} catch (NumberFormatException nfe) {
// Suppress error and continue assuming this is a regular string
}
}
}
Method methodToInvoke = null;
try{
methodToInvoke = clazz.getMethod(methodName, argumentTypes);
}catch(NoSuchMethodException nsm){//Find by method name/ argument count
for (Method method : clazz.getMethods()) {
if (method.getName().equals(methodName) && method.getParameterTypes().length == methodArguments.length) {
if (null == owningObject) {
owningObject = clazz.newInstance();
}
methodToInvoke=method;
break;
}
}
}
if(methodToInvoke!=null){
return methodToInvoke.invoke(owningObject, methodArguments);
}else{
throw new InstantiationException("method not found :" + methodName);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
}
return null;
}
public static void main(String[] arg) {
// StringBuffer buff=new StringBuffer();
// buff.append("Gregs init");
// Functions.call(java.lang.Class<T>, T, java.lang.String, java.lang.String, java.lang.Object...)
/*
* Functions.call(StringBuffer.class, buff, "java.lang.StringBuffer","append"," Init ");
* Functions.call(StringBuffer.class, buff, "java.lang.StringBuffer","append"," greg ");
* System.out.println("output="+ buff);
*/
//#{t:call(null, ".util.DateUtil", "normalizeDate", t:parametize(editRiskActionPlan.riskActionPlan.completionDate,",","java.lang.Object"))}
// c(call(null, "util.DateUtil", "normalizeDate", new Date()));
// #{t:parametize(editRiskActionPlan.riskActionPlan.completionDate,",","java.lang.Object")}
//parametize((new Date()).toString(),",","java.lang.Object");
Date a=new Date();
Date b=new Date();
String rawString=param((Date)b, Date.class.toString() );
//System.out.println(rawString);
//Replaced=#{t:call("Gregs ' car", 'java.lang.String', 'replace', t:params( parameter ))}
String paramA=param("\\u0027","");
String paramB=param("\\u0022","");
String params=paramA+paramB;
String in="I need to ' have a replaced single quote with double";
String out=(String)call(in, "java.lang.String", "replace", params(params));
System.out.println(out);
/*
Object[] obj=params(rawString);
for(Object o:obj){
System.out.println(o);
}
//c(call(null, "@DateUtil", "normalizeDate", obj));
*/
}
}I hope this helps, btw this was copied/pasted from my project so not sure if I missed anything.
June 18th, 2009 in android, java | 13 Comments »
Sorry it took little longer than expected, run in some issues with cupcake (SDK 1.5)
I have attached a Demo project for all interested with some screenshots and modified .project for TabWidget Project(fixes cupcake problem ref http://groups.google.com/group/android-developers/browse_thread/thread/5537ae10e4143240) if you use eclipse.
1. My env:
Eclipse Version: 3.4.2
Android SDK 1.5
Windows
2.After you import the TabWidgedDemo project you will probably need to fix your buildpath.
Make sure to add TabWidet as a reference to TabWidgedDemo.
3.In TabWidged project you will need to update the .project file otherwise you will get Verify error when deploying to the device.
If you have any questions let me know, I hope you enjoy the project, more improvements to come
Download tabwidgetdemo for eclipse
February 24th, 2009 in android, java | 8 Comments »
My frist Android app, this is simple GPS tracker program that let us record our tracks, store and share them.
This project uses my custom TabWidget for Android.
Main features
- Record
- Playback
- Share via Email (Google Earth)
- Share via Twitter (in progress)
- Exporting to SD Card
- Tagging (in progress)
I use icon from http://www.dryicons.com , love their methodology give the little guys an edge by providing free high quality designs.
Screenshots
To Come
Here are some other features that I will implement soon
- Altitude profiler
- Photos
- Profiles
Download Carme source code
February 23rd, 2009 in android, java | 31 Comments »
Due to limitation of Android Tab component I created a custom TabWidget that I am using in couple different projects already. The widget allows us to add custom background and use custom icons, tabs can be Top/Bottom aligned.
Currently tabs can launch new Activity and Dialog , when starting new Activity we can use “startActivityForResult” so our tab will get a notification when other activity have finished.
Read more »
