Add jackson behavior for methods

Added classes to make gson treat methods as jackson does.
Remove unneeded "forGetter" parameter from constructors.
Fixed sonar issue with too long "if" test.
Corrected comment about annotation names.
Adjusted error message.
Removed unused constant.
Removed trailing spaces.

Change-Id: I3a4fc92193737a0dc89f1218e70f093aedbdb152
Issue-ID: POLICY-1428
Signed-off-by: Jim Hahn <jrh3@att.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/Lifter.java b/gson/src/main/java/org/onap/policy/common/gson/internal/Lifter.java
new file mode 100644
index 00000000..bb8ec321
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/internal/Lifter.java
@@ -0,0 +1,62 @@
+/*
+ * ============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.gson.internal;
+
+import com.google.gson.Gson;
+import java.lang.reflect.Method;
+import java.lang.reflect.Type;
+import java.util.Set;
+
+/**
+ * Super class of serializers and de-serializers that deal with "lifted" data, that is,
+ * data that is lifted from a nested json object into the containing object.
+ */
+public class Lifter extends MethodAdapter {
+
+    /**
+     * Names of the properties that are <i>not</i> to be lifted.
+     */
+    private final Set<String> unliftedProps;
+
+    /**
+     * Constructs the object.
+     *
+     * @param gson Gson object providing type adapters
+     * @param unliftedProps property names that should not be lifted
+     * @param accessor method used to access the item from within an object
+     * @param type the class of value on which this operates
+     */
+    public Lifter(Gson gson, Set<String> unliftedProps, Method accessor, Type type) {
+        super(gson, accessor, type);
+
+        this.unliftedProps = unliftedProps;
+    }
+
+    /**
+     * Determines if a property should be lifted.
+     *
+     * @param propName the name of the property
+     * @return {@code true} if the property should be lifted, {@code false} otherwise
+     */
+    public boolean shouldLift(String propName) {
+        return !unliftedProps.contains(propName);
+    }
+}