add new files

processor/src/main/java/com/instagram/common/json/annotation/processor/StringUtil.java

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+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package com.instagram.common.json.annotation.processor;
+
+public class StringUtil {
+
+  /**
+   * We don't want to pull in guava strings just for this one function.
+   */
+  /*package*/ static boolean isNullOrEmpty(String string) {
+    return string == null || string.isEmpty();
+  }
+}

processor/testuut/dependent/src/main/java/com/instagram/common/json/annotation/processor/SubclassWithAbstractParentUUT.java

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+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package com.instagram.common.json.annotation.processor.dependent;
+
+import com.instagram.common.json.annotation.JsonField;
+import com.instagram.common.json.annotation.JsonType;
+import com.instagram.common.json.annotation.processor.parent.AbstractParentUUT;
+
+/**
+ * UUT with abstract superclass.
+ */
+@JsonType
+public class SubclassWithAbstractParentUUT extends AbstractParentUUT {
+  public static final String SUBCLASS_INT_KEY = "subclass_int";
+
+  @JsonField(fieldName = SUBCLASS_INT_KEY)
+  public int subclassInt;
+}

processor/testuut/parent/src/main/java/com/instagram/common/json/annotation/processor/AbstractParentUUT.java

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+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package com.instagram.common.json.annotation.processor.parent;
+
+import com.instagram.common.json.annotation.JsonField;
+import com.instagram.common.json.annotation.JsonType;
+
+/**
+ * Abstract parent class to test that abstract parent classes are processed properly.
+ */
+@JsonType
+public abstract class AbstractParentUUT {
+  public static final String PARENT_STRING_KEY = "parent_string";
+  public static final String PARENT_INT_KEY = "parent_int";
+
+  @JsonField(fieldName = PARENT_STRING_KEY)
+  public String parentString;
+
+  @JsonField(fieldName = PARENT_INT_KEY)
+  public int parentInt;
+}