1 files changed, 135 insertions, 0 deletions
diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/utils/PropertyUtils.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/utils/PropertyUtils.java
new file mode 100644
index 00000000..265346c9
--- /dev/null
+++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/utils/PropertyUtils.java
@@ -0,0 +1,135 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.endpoints.utils;
+
+import java.util.Properties;
+import org.apache.commons.lang3.StringUtils;
+
+/**
+ * Utilities for extracting property values and converting them to other types.
+ */
+public class PropertyUtils {
+    /**
+     * Properties on which to work.
+     */
+    private Properties properties;
+
+    /**
+     * Prefix to prepend to property names.
+     */
+    private String prefix;
+
+    /**
+     * Function to invoke if a property value is invalid.
+     */
+    private TriConsumer<String, String, Exception> invalidHandler;
+
+
+    /**
+     * Constructs the object.
+     *
+     * @param properties properties on which to work
+     * @param prefix prefix to prepend to property names
+     * @param invalidHandler function to invoke if a property value is invalid
+     */
+    public PropertyUtils(Properties properties, String prefix, TriConsumer<String, String, Exception> invalidHandler) {
+        this.properties = properties;
+        this.prefix = prefix;
+        this.invalidHandler = invalidHandler;
+    }
+
+    /**
+     * Gets a string property.
+     *
+     * @param propName name of the property whose value is to be retrieved
+     * @param defaultValue value to use if the property value is empty or does not exist
+     * @return the property's value
+     */
+    public String getString(String propName, String defaultValue) {
+        String propValue = getProperty(propName);
+        return (StringUtils.isBlank(propValue) ? defaultValue : propValue);
+    }
+
+    /**
+     * Gets a boolean property.
+     *
+     * @param propName name of the property whose value is to be retrieved
+     * @param defaultValue value to use if the property value is empty or does not exist
+     * @return the property's value
+     */
+    public boolean getBoolean(String propName, boolean defaultValue) {
+        String propValue = getProperty(propName);
+
+        if (!StringUtils.isBlank(propValue)) {
+            return Boolean.parseBoolean(propValue);
+        }
+
+        return defaultValue;
+    }
+
+    /**
+     * Gets an integer property.
+     *
+     * @param propName name of the property whose value is to be retrieved
+     * @param defaultValue value to use if the property value is empty or does not exist
+     * @return the property's value
+     */
+    public int getInteger(String propName, int defaultValue) {
+        String propValue = getProperty(propName);
+
+        if (!StringUtils.isBlank(propValue)) {
+            try {
+                return Integer.parseInt(propValue);
+
+            } catch (NumberFormatException nfe) {
+                invalidHandler.accept(getFullName(propName), propValue, nfe);
+            }
+        }
+
+        return defaultValue;
+    }
+
+
+    /**
+     * Gets a property's value.
+     *
+     * @param propName name of the property whose value is to be retrieved
+     * @return the property's value, or {@code null} if it does not exist
+     */
+    private String getProperty(String propName) {
+        return properties.getProperty(getFullName(propName));
+    }
+
+    /**
+     * Gets the full property name, with the prefix prepended.
+     *
+     * @param propName property name, without the prefix
+     * @return the full property name
+     */
+    private String getFullName(String propName) {
+        return prefix + propName;
+    }
+
+    @FunctionalInterface
+    public static interface TriConsumer<A,B,C> {
+        public void accept(A propName, B propValue, C exception);
+    }
+}