SetMultimap in MapAllEnumsProcessingStep.java was used incorrectly.

Thus, using the @EnumMappers annotation more than once in your project
caused a compilation error. This fixes #2

Author: Martin

enum-mapper-processor/src/main/java/com/tmtron/enums/processor/MapAllEnumsProcessingStep.java

@@ -23,7 +23,9 @@
 import com.tmtron.enums.EnumMappers;
 
 import java.lang.annotation.Annotation;
+import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 import java.util.Set;
 
 import javax.annotation.processing.ProcessingEnvironment;
@@ -52,10 +54,12 @@ public Set<? extends Class<? extends Annotation>> annotations() {
     @Override
     public Set<Element> process(SetMultimap<Class<? extends Annotation>, Element> elementsByAnnotation) {
         try {
+            Map<Class<? extends Annotation>, Collection<Element>> annotationsMap =
+                    elementsByAnnotation.asMap();
             // the annotations() method tells the framework which annotations to accept
-            if (elementsByAnnotation.keys().size() > 2) throw new RuntimeException("Too many annotations");
+            if (annotationsMap.keySet().size() > 2) throw new RuntimeException("Too many annotations");
 
-            for (Class<? extends Annotation> annotation : elementsByAnnotation.keys()) {
+            for (Class<? extends Annotation> annotation : annotationsMap.keySet()) {
                 // the elements which are annotated with the annotation
                 // e.g. the EnumMappers annotation may be present on multiple classes of packages
                 Set<Element> annotatedElements = elementsByAnnotation.get(annotation);

enum-mapper-processor/src/test/java/com/tmtron/enums/processor/TestMappersOn2classes.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright © 2017 Martin Trummer (martin.trummer@tmtron.com)
+ *
+ * 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.
+ */
+package com.tmtron.enums.processor;
+
+import org.junit.Test;
+
+public class TestMappersOn2classes extends AnnotationProcessorTest {
+    @Test
+    public void test() throws Exception {
+        assertAboutEnumsProcessing(getJfoResource("TwoClasses_Source.java"))
+                .compilesWithoutWarnings()
+                .and()
+                .generatesSources(
+                        getJfoResource("BoolEnum_MapperFull.java"),
+                        getJfoResource("ColorEnum_MapperFull.java"));
+    }
+
+}

enum-mapper-processor/src/test/resources/TestMappersOn2Classes/BoolEnum_MapperFull.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright © 2017 Martin Trummer (martin.trummer@tmtron.com)
+ *
+ * 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.
+ */
+// GENERATED
+package com.test;
+
+import com.tmtron.enums.EnumMapperFull;
+
+import javax.annotation.Generated;
+
+@Generated(
+        value = "com.tmtron.enums.processor.EnumsAnnotationProcessor",
+        date = "1976-12-14T15:16:17.234+02:00",
+        comments = "origin=com.test.TwoClasses_Source.AnnotatedClassA"
+)
+public final class BoolEnum_MapperFull {
+    public static <V> IsetON<V> setOFF(V value) {
+        StagedBuilder<V> result = new StagedBuilder<>();
+        result.enumMapperBuilder.put(TwoClasses_Source.BoolEnum.OFF, value);
+        return result;
+    }
+
+    public interface IsetON<V> {
+        EnumMapperFull<TwoClasses_Source.BoolEnum, V> setON(V value);
+    }
+
+    private static class StagedBuilder<V> implements IsetON<V> {
+        private final EnumMapperFull.Builder<TwoClasses_Source.BoolEnum, V> enumMapperBuilder = EnumMapperFull.builder
+                (TwoClasses_Source.BoolEnum.class);
+
+        @Override
+        public EnumMapperFull<TwoClasses_Source.BoolEnum, V> setON(V value) {
+            enumMapperBuilder.put(TwoClasses_Source.BoolEnum.ON, value);
+            return enumMapperBuilder.build();
+        }
+    }
+}

enum-mapper-processor/src/test/resources/TestMappersOn2Classes/ColorEnum_MapperFull.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright © 2017 Martin Trummer (martin.trummer@tmtron.com)
+ *
+ * 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.
+ */
+package com.test;
+
+import com.tmtron.enums.EnumMapperFull;
+
+import javax.annotation.Generated;
+
+@Generated(
+        value = "com.tmtron.enums.processor.EnumsAnnotationProcessor",
+        date = "1976-12-14T15:16:17.234+02:00",
+        comments = "origin=com.test.TwoClasses_Source.AnnotatedClassB"
+)
+public final class ColorEnum_MapperFull {
+    public static <V> IsetBLUE<V> setRED(V value) {
+        StagedBuilder<V> result = new StagedBuilder<>();
+        result.enumMapperBuilder.put(TwoClasses_Source.ColorEnum.RED, value);
+        return result;
+    }
+
+    public interface IsetBLUE<V> {
+        EnumMapperFull<TwoClasses_Source.ColorEnum, V> setBLUE(V value);
+    }
+
+    private static class StagedBuilder<V> implements IsetBLUE<V> {
+        private final EnumMapperFull.Builder<TwoClasses_Source.ColorEnum, V> enumMapperBuilder = EnumMapperFull.builder
+                (TwoClasses_Source.ColorEnum.class);
+
+        @Override
+        public EnumMapperFull<TwoClasses_Source.ColorEnum, V> setBLUE(V value) {
+            enumMapperBuilder.put(TwoClasses_Source.ColorEnum.BLUE, value);
+            return enumMapperBuilder.build();
+        }
+    }
+}

enum-mapper-processor/src/test/resources/TestMappersOn2Classes/TwoClasses_Source.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright © 2017 Martin Trummer (martin.trummer@tmtron.com)
+ *
+ * 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.
+ */
+package com.test;
+
+/*
+ * Test if we can put the @EnumMappers annotation on 2 different classes
+ * did not work in V1.0.1
+ */
+
+import com.tmtron.enums.EnumMappers;
+
+public class TwoClasses_Source {
+    enum BoolEnum {OFF, ON}
+
+    enum ColorEnum {RED, BLUE}
+
+    @EnumMappers({TwoClasses_Source.BoolEnum.class})
+    public static class AnnotatedClassA {
+
+    }
+
+    @EnumMappers({TwoClasses_Source.ColorEnum.class})
+    public static class AnnotatedClassB {
+
+    }
+
+}