* use proper Groovy DefaultTypeTransformation instead of hacky "value as boolean" script

source/net/sourceforge/filebot/format/ExpressionFilter.java

@@ -1,7 +1,5 @@
-
 package net.sourceforge.filebot.format;
 
-
 import java.security.AccessController;
 
 import javax.script.Bindings;
@@ -9,44 +7,36 @@ import javax.script.Compilable;
 import javax.script.CompiledScript;
 import javax.script.ScriptContext;
 import javax.script.ScriptException;
-import javax.script.SimpleBindings;
 import javax.script.SimpleScriptContext;
 
+import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
 
 public class ExpressionFilter {
 
 	private final String expression;
-	
-	private final CompiledScript userScript;
-	private final CompiledScript asBooleanScript;
+	private final CompiledScript compiledExpression;
 
 	private Throwable lastException;
 
-	
 	public ExpressionFilter(String expression) throws ScriptException {
 		this.expression = expression;
 
 		Compilable engine = (Compilable) ExpressionFormat.getGroovyScriptEngine();
-		this.userScript = new SecureCompiledScript(engine.compile(expression)); // sandboxed script
-		this.asBooleanScript = engine.compile("value as Boolean");
+		this.compiledExpression = new SecureCompiledScript(engine.compile(expression)); // sandboxed script
 	}
 
-	
 	public String getExpression() {
 		return expression;
 	}
 
-	
 	public Throwable getLastException() {
 		return lastException;
 	}
 
-	
 	public boolean matches(Object value) throws ScriptException {
 		return matches(new ExpressionBindings(value));
 	}
 
-	
 	public boolean matches(Bindings bindings) throws ScriptException {
 		this.lastException = null;
 
@@ -59,15 +49,10 @@ public class ExpressionFilter {
 
 		try {
 			// evaluate user script
-			Object value = userScript.eval(context);
+			Object value = compiledExpression.eval(context);
 
-			// convert value to boolean
-			Bindings valueBinding = new SimpleBindings();
-			valueBinding.put("value", value);
-			Object result = asBooleanScript.eval(valueBinding);
-			if (result instanceof Boolean) {
-				return (Boolean) result;
-			}
+			// value as boolean
+			return DefaultTypeTransformation.castToBoolean(value);
 		} catch (Throwable e) {
 			// ignore any and all scripting exceptions
 			this.lastException = e;