com.google.auto.factory.processor.AnnotationValues.java Source code

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Here is the source code for com.google.auto.factory.processor.AnnotationValues.java

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/*
 * Copyright (C) 2013 Google, Inc.
 *
 * 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.google.auto.factory.processor;

import java.util.List;

import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.ElementFilter;
import javax.lang.model.util.SimpleAnnotationValueVisitor6;
import javax.lang.model.util.SimpleTypeVisitor6;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

final class AnnotationValues {
    private AnnotationValues() {
    }

    static TypeElement asType(AnnotationValue value) {
        return value.accept(new SimpleAnnotationValueVisitor6<TypeElement, Void>() {
            @Override
            protected TypeElement defaultAction(Object o, Void p) {
                throw new IllegalArgumentException();
            }

            @Override
            public TypeElement visitType(TypeMirror t, Void p) {
                return t.accept(new SimpleTypeVisitor6<TypeElement, Void>() {
                    @Override
                    protected TypeElement defaultAction(TypeMirror e, Void p) {
                        throw new AssertionError();
                    }

                    @Override
                    public TypeElement visitDeclared(DeclaredType t, Void p) {
                        return Iterables.getOnlyElement(ElementFilter.typesIn(ImmutableList.of(t.asElement())));
                    }
                }, null);
            }
        }, null);
    }

    static ImmutableList<? extends AnnotationValue> asList(AnnotationValue value) {
        return value.accept(new SimpleAnnotationValueVisitor6<ImmutableList<? extends AnnotationValue>, Void>() {
            @Override
            protected ImmutableList<? extends AnnotationValue> defaultAction(Object o, Void p) {
                throw new IllegalArgumentException();
            }

            @Override
            public ImmutableList<? extends AnnotationValue> visitArray(List<? extends AnnotationValue> vals,
                    Void p) {
                return ImmutableList.copyOf(vals);
            }
        }, null);
    }
}