#154 Introduce Compiler.supportsIncrementalCompilation

Author: rfscholte

plexus-compiler-api/src/main/java/org/codehaus/plexus/compiler/Compiler.java

@@ -89,4 +89,15 @@ List<CompilerError> compile( CompilerConfiguration configuration )
      */
     String[] createCommandLine( CompilerConfiguration config )
         throws CompilerException;
+    
+
+    /**
+     * Based on this flag the caller can decide the strategy how to compile. E.g. is incrementCompilation is not supported,
+     * it could decide to clear to outputDirectory to enforce a complete recompilation.
+     * 
+     * @return {@code true} if incrementalCompilation is supported, otherwise {@code false} 
+     */
+    default boolean supportsIncrementalCompilation() {
+        return false;
+    }
 }

plexus-compilers/plexus-compiler-eclipse/src/main/java/org/codehaus/plexus/compiler/eclipse/EclipseJavaCompiler.java

@@ -684,6 +684,11 @@ public String[] createCommandLine( CompilerConfiguration config )
         return null;
     }
 
+    @Override
+    public boolean supportsIncrementalCompilation()
+    {
+        return true;
+    }
 
     /**
      * Change any Maven Java version number to ECJ's version number. Do not check the validity