com.facebook.buck.jvm.java.abi.AnnotationDefaultValueMirror.java Source code

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Here is the source code for com.facebook.buck.jvm.java.abi.AnnotationDefaultValueMirror.java

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/*
 * Copyright 2016-present Facebook, 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.facebook.buck.jvm.java.abi;

import com.google.common.base.Preconditions;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

import javax.annotation.Nullable;

public class AnnotationDefaultValueMirror extends AnnotationVisitor {
    @Nullable
    private AnnotationValueMirror defaultValue;

    public AnnotationDefaultValueMirror() {
        super(Opcodes.ASM5);
    }

    @Override
    public void visit(String name, Object value) {
        Preconditions.checkState(defaultValue == null);

        defaultValue = AnnotationValueMirror.forPrimitive(value);
    }

    @Override
    public void visitEnum(String name, String desc, String value) {
        Preconditions.checkState(defaultValue == null);

        defaultValue = AnnotationValueMirror.forEnum(desc, value);
    }

    @Override
    public AnnotationVisitor visitAnnotation(String name, String desc) {
        Preconditions.checkState(defaultValue == null);

        AnnotationMirror annotationMirror = new AnnotationMirror(desc, true);

        defaultValue = AnnotationValueMirror.forAnnotation(annotationMirror);

        return annotationMirror;
    }

    @Override
    public AnnotationVisitor visitArray(String name) {
        Preconditions.checkState(defaultValue == null);

        defaultValue = AnnotationValueMirror.forArray();
        return defaultValue;
    }

    public void appendTo(MethodVisitor method) {
        final AnnotationVisitor annotationVisitor = method.visitAnnotationDefault();

        Preconditions.checkNotNull(defaultValue).accept(null, annotationVisitor);
        annotationVisitor.visitEnd();
    }
}