Fixed build issue, see #142 #issuecomment-939136245

#142 (comment)

excel/annotation-processor/src/main/java/com/riiablo/excel/PrimaryKeyAnnotatedElement.java

@@ -0,0 +1,50 @@
+package com.riiablo.excel;
+
+import com.squareup.javapoet.ClassName;
+import com.squareup.javapoet.TypeName;
+import java.util.Arrays;
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ElementKind;
+import javax.lang.model.element.VariableElement;
+import org.apache.commons.lang3.ArrayUtils;
+
+import com.riiablo.excel.annotation.PrimaryKey;
+
+public class PrimaryKeyAnnotatedElement {
+  static final TypeName STRING = ClassName.get("java.lang", "String");
+  static final TypeName[] VALID_TYPES = new TypeName[] { TypeName.INT, STRING };
+
+  static PrimaryKeyAnnotatedElement get(Element element) {
+    AnnotationMirror a = ElementUtils.getAnnotationMirror(element, PrimaryKey.class);
+    if (a == null) return null;
+
+    if (element.getKind() != ElementKind.FIELD) {
+      throw new GenerationException(
+          String.format("only fields can be @%s", PrimaryKey.class.getCanonicalName()),
+          element, a);
+    }
+
+    TypeName elementType = ClassName.get(element.asType());
+    if (!ArrayUtils.contains(VALID_TYPES, elementType)) {
+      throw new GenerationException(
+          String.format("@%s must be one of %s",
+              PrimaryKey.class.getCanonicalName(),
+              Arrays.toString(VALID_TYPES)),
+          element, a);
+    }
+
+    PrimaryKey annotation = element.getAnnotation(PrimaryKey.class);
+    return new PrimaryKeyAnnotatedElement((VariableElement) element, a, annotation);
+  }
+
+  PrimaryKey annotation;
+  AnnotationMirror mirror;
+  VariableElement element;
+
+  PrimaryKeyAnnotatedElement(VariableElement element, AnnotationMirror mirror, PrimaryKey annotation) {
+    this.element = element;
+    this.mirror = mirror;
+    this.annotation = annotation;
+  }
+}