1 files changed, 61 insertions, 0 deletions
diff --git a/core/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/common/EnvProperties.java b/core/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/common/EnvProperties.java
new file mode 100644
index 000000000..2e9f2673d
--- /dev/null
+++ b/core/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/common/EnvProperties.java
@@ -0,0 +1,61 @@
+package org.onap.ccsdk.sli.core.utils.common;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.util.Enumeration;
+import java.util.Properties;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class EnvProperties extends Properties {
+
+    @Override
+    public synchronized void load(Reader reader) throws IOException {
+        super.load(reader);
+        resolveAllValues();
+    }
+
+    @Override
+    public synchronized void load(InputStream inStream) throws IOException {
+        super.load(inStream);
+        resolveAllValues();
+    }
+
+	@Override
+	public synchronized Object setProperty(String key, String value) {
+		return super.setProperty(key, EnvProperties.resolveValue(value));
+	}
+
+    private void resolveAllValues() {
+       Enumeration<?> propNames = propertyNames();
+
+       while (propNames.hasMoreElements()) {
+           String propName = (String) propNames.nextElement();
+           super.setProperty(propName, EnvProperties.resolveValue(getProperty(propName)));
+       }
+       
+    }
+
+    public static String resolveValue(String value) {
+        if (value == null) {
+            return null;
+        }
+
+        Pattern p = Pattern.compile("\\$\\{(\\w+)((?:\\:\\-)([^\\}]*))?\\}");
+        Matcher m = p.matcher(value);
+
+        StringBuffer sb = new StringBuffer();
+        while (m.find()) {
+            String envVarName = null == m.group(1) ? m.group(2) : m.group(1);
+            String envVarDefault = null == m.group(3) ? "" : m.group(3);
+            String envVarValue = System.getenv(envVarName);
+
+            m.appendReplacement(sb,
+                null == envVarValue ? Matcher.quoteReplacement(envVarDefault) : Matcher.quoteReplacement(envVarValue));
+         }
+        m.appendTail(sb);
+        return sb.toString();
+        
+    }
+}