76 lines
2.7 KiB
Java
76 lines
2.7 KiB
Java
/*
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* Copyright (C) 2013 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.internal.codegen;
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import com.google.common.collect.ImmutableList;
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import java.util.List;
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import javax.lang.model.element.AnnotationValue;
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import javax.lang.model.element.AnnotationValueVisitor;
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import javax.lang.model.type.TypeMirror;
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import javax.lang.model.util.SimpleAnnotationValueVisitor8;
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/** Utility methods for working with {@link AnnotationValue} instances. */
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final class MoreAnnotationValues {
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/**
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* Returns the list of values represented by an array annotation value.
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*
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* @throws IllegalArgumentException unless {@code annotationValue} represents an array
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*/
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static ImmutableList<AnnotationValue> asAnnotationValues(AnnotationValue annotationValue) {
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return annotationValue.accept(AS_ANNOTATION_VALUES, null);
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}
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private static final AnnotationValueVisitor<ImmutableList<AnnotationValue>, String>
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AS_ANNOTATION_VALUES =
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new SimpleAnnotationValueVisitor8<ImmutableList<AnnotationValue>, String>() {
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@Override
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public ImmutableList<AnnotationValue> visitArray(
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List<? extends AnnotationValue> vals, String elementName) {
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return ImmutableList.copyOf(vals);
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}
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@Override
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protected ImmutableList<AnnotationValue> defaultAction(Object o, String elementName) {
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throw new IllegalArgumentException(elementName + " is not an array: " + o);
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}
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};
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/**
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* Returns the type represented by an annotation value.
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*
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* @throws IllegalArgumentException unless {@code annotationValue} represents a single type
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*/
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static TypeMirror asType(AnnotationValue annotationValue) {
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return AS_TYPE.visit(annotationValue);
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}
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private static final AnnotationValueVisitor<TypeMirror, Void> AS_TYPE =
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new SimpleAnnotationValueVisitor8<TypeMirror, Void>() {
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@Override
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public TypeMirror visitType(TypeMirror t, Void p) {
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return t;
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}
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@Override
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protected TypeMirror defaultAction(Object o, Void p) {
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throw new TypeNotPresentException(o.toString(), null);
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}
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};
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private MoreAnnotationValues() {}
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}
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