From 92f1d4c34c5082bbfc8e328da78d66e6f772b704 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Per-=C3=85ke=20Minborg?= <minborg@speedment.com>
Date: Fri, 28 Oct 2016 09:01:19 -0700
Subject: [PATCH] Use Collection .isEmpty() over .size() == 0

Change-Id: I80b73b653e97904605dc62484a7448f3bfbf721f
---
 .../main/java/com/vaadin/server/CompositeErrorMessage.java    | 4 ++--
 server/src/main/java/com/vaadin/server/JsonPaintTarget.java   | 2 +-
 server/src/main/java/com/vaadin/ui/declarative/Design.java    | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/server/src/main/java/com/vaadin/server/CompositeErrorMessage.java b/server/src/main/java/com/vaadin/server/CompositeErrorMessage.java
index 6e37a94c5e..f96bcbac27 100644
--- a/server/src/main/java/com/vaadin/server/CompositeErrorMessage.java
+++ b/server/src/main/java/com/vaadin/server/CompositeErrorMessage.java
@@ -43,7 +43,7 @@ public class CompositeErrorMessage extends AbstractErrorMessage {
             addErrorMessage(errorMessage);
         }
 
-        if (getCauses().size() == 0) {
+        if (getCauses().isEmpty()) {
             throw new IllegalArgumentException(
                     "Composite error message must have at least one error");
         }
@@ -67,7 +67,7 @@ public class CompositeErrorMessage extends AbstractErrorMessage {
             addErrorMessage(i.next());
         }
 
-        if (getCauses().size() == 0) {
+        if (getCauses().isEmpty()) {
             throw new IllegalArgumentException(
                     "Composite error message must have at least one error");
         }
diff --git a/server/src/main/java/com/vaadin/server/JsonPaintTarget.java b/server/src/main/java/com/vaadin/server/JsonPaintTarget.java
index 9792673062..d5276aefaf 100644
--- a/server/src/main/java/com/vaadin/server/JsonPaintTarget.java
+++ b/server/src/main/java/com/vaadin/server/JsonPaintTarget.java
@@ -838,7 +838,7 @@ public class JsonPaintTarget implements PaintTarget {
         }
 
         private String variablesAsJsonObject() {
-            if (variables.size() == 0) {
+            if (variables.isEmpty()) {
                 return "";
             }
             final StringBuilder buf = new StringBuilder();
diff --git a/server/src/main/java/com/vaadin/ui/declarative/Design.java b/server/src/main/java/com/vaadin/ui/declarative/Design.java
index 0c5595028e..b5b6762f20 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/Design.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/Design.java
@@ -454,7 +454,7 @@ public class Design implements Serializable {
                     "The first level of a component hierarchy should contain at most one root component, but found "
                             + children.size() + ".");
         }
-        Element element = children.size() == 0 ? null : children.first();
+        Element element = children.isEmpty() ? null : children.first();
         if (componentRoot != null) {
             if (element == null) {
                 throw new DesignException(
-- 
2.39.5