adding equals and hashcode on I18nMessage

vraptor-core/src/main/java/br/com/caelum/vraptor/validator/I18nMessage.java

@@ -18,6 +18,8 @@
 import static com.google.common.base.Objects.toStringHelper;
 
 import java.text.MessageFormat;
+import java.util.Arrays;
+import java.util.Objects;
 import java.util.ResourceBundle;
 
 import javax.enterprise.inject.Vetoed;
@@ -108,4 +110,22 @@ public String toString() {
 		return toStringHelper(this).add("category", category).add("message", message).add("severity",severity).add("parameters", parameters).toString();
 	}
 
+	@Override
+	public int hashCode() {
+		return Objects.hashCode(category) ^ Objects.hashCode(message) 
+			^ Objects.hash(parameters) ^ Objects.hashCode(severity);
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) return true;
+		if (obj == null) return false;
+		if (getClass() != obj.getClass()) return false;
+		I18nMessage other = (I18nMessage) obj;
+		return Objects.equals(category, other.category) 
+			&& Objects.equals(message, other.message)
+			&& ((parameters == null &&  other.parameters == null) 
+				|| Arrays.equals(parameters, other.parameters))
+			&& Objects.equals(severity, other.severity);
+	}
 }

vraptor-core/src/main/java/br/com/caelum/vraptor/validator/I18nParam.java

@@ -16,6 +16,7 @@
 package br.com.caelum.vraptor.validator;
 
 import java.io.Serializable;
+import java.util.Objects;
 import java.util.ResourceBundle;
 
 import javax.enterprise.inject.Vetoed;
@@ -48,4 +49,18 @@ public String getKey(ResourceBundle bundle) {
 	public String toString() {
 		return String.format("i18n(%s)", key);
 	}
-}
+
+	@Override
+	public int hashCode() {
+		return Objects.hashCode(key);
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) return true;
+		if (obj == null) return false;
+		if (getClass() != obj.getClass()) return false;
+		I18nParam other = (I18nParam) obj;
+		return Objects.equals(key, other.key);
+	}
+}

vraptor-core/src/test/java/br/com/caelum/vraptor/validator/I18nMessageTest.java

@@ -0,0 +1,32 @@
+package br.com.caelum.vraptor.validator;
+
+import static br.com.caelum.vraptor.validator.Severity.INFO;
+import static br.com.caelum.vraptor.validator.Severity.WARN;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.not;
+import static org.junit.Assert.assertThat;
+
+import org.junit.Test;
+
+public class I18nMessageTest {
+
+	@Test
+	public void shouldBeEqualAccordingToMessageCategoryParamsAndSeverity() {
+
+		Message m1 = new I18nMessage(new I18nParam("foo"), "equal", INFO, "param");
+		Message m2 = new I18nMessage(new I18nParam("foo"), "equal", INFO, "param");
+		assertThat("should be equals, since has the same params", m1, equalTo(m2));
+
+		Message m3 = new I18nMessage(new I18nParam("bar"), "equal", INFO, "param");
+		assertThat("shouldn't be equals, i18nParam is different", m2, not(equalTo(m3)));
+
+		Message m4 = new I18nMessage(new I18nParam("bar"), "not.equal", INFO, "param");
+		assertThat("shouldn't be equals, category is different", m3, not(equalTo(m4)));
+
+		Message m5 = new I18nMessage(new I18nParam("bar"), "not.equal", INFO, "other");
+		assertThat("shouldn't be equals, message is different", m4, not(equalTo(m5)));
+
+		Message m6 = new I18nMessage(new I18nParam("bar"), "not.equal", WARN, "other");
+		assertThat("shouldn't be equals, severity is different", m5, not(equalTo(m6)));
+	}
+}