Initial code commit

.gitignore

@@ -12,6 +12,6 @@
 hs_err_pid*
 
 # IntelliJ files
-.idea/*
+.idea/
 *.iml
-target/*
+target/

statiflex/pom.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+
+ <groupId>com.caffinc</groupId>
+ <artifactId>statiflex</artifactId>
+ <name>statiflex</name>
+ <version>1.0</version>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.slf4j</groupId>
+ <artifactId>slf4j-log4j12</artifactId>
+ <version>1.7.12</version>
+ </dependency>
+ <dependency>
+ <groupId>junit</groupId>
+ <artifactId>junit</artifactId>
+ <version>4.12</version>
+ <scope>test</scope>
+ </dependency>
+ </dependencies>
+</project>

statiflex/src/main/java/com/caffinc/statiflex/Statiflex.java

@@ -0,0 +1,99 @@
+package com.caffinc.statiflex;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
+
+/**
+ * Uses reflection to modify static final fields.
+ * User under extreme duress.
+ *
+ * uuuuuuu
+ * uu$$$$$$$$$$$uu
+ * uu$$$$$$$$$$$$$$$$$uu
+ * u$$$$$$$$$$$$$$$$$$$$$u
+ * u$$$$$$$$$$$$$$$$$$$$$$$u
+ * u$$$$$$$$$$$$$$$$$$$$$$$$$u
+ * u$$$$$$$$$$$$$$$$$$$$$$$$$u
+ * u$$$$$$" "$$$" "$$$$$$u
+ * "$$$$" u$u $$$$"
+ * $$$u u$u u$$$
+ * $$$u u$$$u u$$$
+ * "$$$$uu$$$ $$$uu$$$$"
+ * "$$$$$$$" "$$$$$$$"
+ * u$$$$$$$u$$$$$$$u
+ * u$"$"$"$"$"$"$u
+ * uuu $$u$ $ $ $ $u$$ uuu
+ * u$$$$ $$$$$u$u$u$$$ u$$$$
+ * $$$$$uu "$$$$$$$$$" uu$$$$$$
+ *u$$$$$$$$$$$uu """"" uuuu$$$$$$$$$$
+ *$$$$"""$$$$$$$$$$uuu uu$$$$$$$$$"""$$$"
+ * """ ""$$$$$$$$$$$uu ""$"""
+ * uuuu ""$$$$$$$$$$uuu
+ * u$$$uuu$$$$$$$$$uu ""$$$$$$$$$$$uuu$$$
+ * $$$$$$$$$$"""" ""$$$$$$$$$$$"
+ * "$$$$$" ""$$$$""
+ * $$$" $$$$"
+ *
+ * @author Sriram
+ */
+public class Statiflex
+{
+ private static final Logger LOG = LoggerFactory.getLogger( Statiflex.class );
+
+
+ /**
+ * Private constructor, no instantiation
+ */
+ private Statiflex()
+ {
+ }
+
+
+ /**
+ * Changes the value of a private static final field in a class
+ * Note: Compiler optimization might inline static final fields which will break this, use with caution
+ * @param clazz Class to modify
+ * @param fieldName Field to modify
+ * @param value Value to set
+ * @return true if set succeeded, false otherwise
+ * @throws NoSuchFieldException Thrown if the field specified was not found
+ */
+ public static boolean flex( Class clazz, String fieldName, Object value ) throws NoSuchFieldException
+ {
+ return flex( clazz.getDeclaredField( fieldName ), value );
+ }
+
+
+ /**
+ * Changes the value of a private static final field
+ * @param field Field to modify
+ * @param value Value to set
+ * @return true if set succeeded, false otherwise
+ */
+ private static boolean flex( Field field, Object value )
+ {
+ try {
+ Field modifiersField = Field.class.getDeclaredField( "modifiers" );
+ boolean isModifierAccessible = modifiersField.isAccessible();
+ modifiersField.setAccessible( true );
+ modifiersField.setInt( field, field.getModifiers() & ~Modifier.FINAL );
+
+ boolean isAccessible = field.isAccessible();
+ field.setAccessible( true );
+ field.set( null, value );
+
+ field.setAccessible( isAccessible );
+ modifiersField.setAccessible( isModifierAccessible );
+ return true;
+ } catch ( IllegalAccessException e ) {
+ LOG.error( "Could not access field {}", field.getName(), e );
+ } catch ( NoSuchFieldException e ) {
+ LOG.error( "Could not find field, cannot modify value", e );
+ }
+ return false;
+ }
+}

statiflex/src/main/resources/log4j.properties

@@ -0,0 +1,8 @@
+# Root logger option
+log4j.rootLogger=INFO, stdout
+
+# Direct log messages to stdout
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.Target=System.out
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

statiflex/src/test/java/com/caffinc/statiflex/StatiflexTest.java

@@ -0,0 +1,33 @@
+package com.caffinc.statiflex;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+
+/**
+ * Tests the Statiflex class
+ * @author Sriram
+ */
+public class StatiflexTest
+{
+ static class DummyClass
+ {
+ private static final String DUMMY_FIELD = getDummyValue();
+
+
+ private static String getDummyValue()
+ {
+ return "TEST";
+ }
+ }
+
+
+ @Test
+ public void testFlex() throws Exception
+ {
+ Assert.assertEquals( "private static final value should be TEST", "TEST", DummyClass.DUMMY_FIELD );
+ Statiflex.flex( DummyClass.class, "DUMMY_FIELD", "TESTED" );
+ Assert.assertEquals( "private static final value should be TESTED after flexing", "TESTED", DummyClass
+ .DUMMY_FIELD );
+ }
+}