Add support for parser context in MVEL conditions

Resolves #197

easy-rules-mvel/src/main/java/org/jeasy/rules/mvel/MVELCondition.java

@@ -26,6 +26,7 @@ package org.jeasy.rules.mvel;
 import org.jeasy.rules.api.Condition;
 import org.jeasy.rules.api.Facts;
 import org.mvel2.MVEL;
+import org.mvel2.ParserContext;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -53,6 +54,17 @@ public class MVELCondition implements Condition {
         compiledExpression = MVEL.compileExpression(expression);
     }
 
+    /**
+     * Create a new {@link MVELCondition}.
+     *
+     * @param expression    the condition written in expression language
+     * @param parserContext the MVEL parser context
+     */
+    public MVELCondition(String expression, ParserContext parserContext) {
+        this.expression = expression;
+        compiledExpression = MVEL.compileExpression(expression, parserContext);
+    }
+
     @Override
     public boolean evaluate(Facts facts) {
         try {

easy-rules-mvel/src/test/java/org/jeasy/rules/mvel/MVELConditionTest.java

@@ -26,6 +26,7 @@ package org.jeasy.rules.mvel;
 import org.jeasy.rules.api.Condition;
 import org.jeasy.rules.api.Facts;
 import org.junit.Test;
+import org.mvel2.ParserContext;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -57,4 +58,18 @@ public class MVELConditionTest {
         // then
         assertThat(evaluationResult).isFalse();
     }
+
+    @Test
+    public void testMVELConditionWithExpressionAndParserContext() {
+        // given
+        ParserContext context = new ParserContext();
+        context.addPackageImport("java.util");
+        Condition condition = new MVELCondition("return new java.util.Random(123).nextBoolean();", context);
+        Facts facts = new Facts();
+        // when
+        boolean evaluationResult = condition.evaluate(facts);
+
+        // then
+        assertThat(evaluationResult).isTrue();
+    }
 }