From e71fbb9f46cd3bd49b68ef30a156bc0715bd979e Mon Sep 17 00:00:00 2001
From: Phillip Webb <pwebb@pivotal.io>
Date: Thu, 18 Sep 2014 23:17:13 -0700
Subject: [PATCH] Implement containsProperty on MapPropertySource

Improve the performance of MapPropertySource by directly implementing
the containsProperty property.

Issue: SPR-12224
---
 .../springframework/core/env/MapPropertySource.java  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/spring-core/src/main/java/org/springframework/core/env/MapPropertySource.java b/spring-core/src/main/java/org/springframework/core/env/MapPropertySource.java
index b8537bed63..9f9863dc43 100644
--- a/spring-core/src/main/java/org/springframework/core/env/MapPropertySource.java
+++ b/spring-core/src/main/java/org/springframework/core/env/MapPropertySource.java
@@ -18,6 +18,7 @@ package org.springframework.core.env;
 
 import java.util.Map;
 
+import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
 /**
@@ -43,4 +44,15 @@ public class MapPropertySource extends EnumerablePropertySource<Map<String, Obje
 		return StringUtils.toStringArray(this.source.keySet());
 	}
 
+	@Override
+	public boolean containsProperty(String name) {
+		Assert.notNull(name, "Property name must not be null");
+		boolean containsProperty = this.source.containsKey(name);
+		if (logger.isDebugEnabled()) {
+			logger.debug(String.format("PropertySource [%s] %s '%s'", getName(),
+					(containsProperty ? "contains" : "does not contain"), name));
+		}
+		return containsProperty;
+	}
+
 }