75 lines
2.8 KiB
Java
75 lines
2.8 KiB
Java
/*
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* Copyright (C) 2021 The Android Open Source Project
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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 com.android.annotationvisitor;
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import com.google.common.base.Preconditions;
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import org.apache.bcel.classfile.AnnotationElementValue;
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import org.apache.bcel.classfile.AnnotationEntry;
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import org.apache.bcel.classfile.ArrayElementValue;
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import org.apache.bcel.classfile.ElementValue;
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import org.apache.bcel.classfile.ElementValuePair;
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/**
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* Handles a repeated annotation container.
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*
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* <p>The enclosed annotations are passed to the {@link #mWrappedHandler}.
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*/
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public class RepeatedAnnotationHandler extends AnnotationHandler {
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private static final String VALUE = "value";
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private final AnnotationHandler mWrappedHandler;
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private final String mInnerAnnotationName;
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public RepeatedAnnotationHandler(String innerAnnotationName, AnnotationHandler wrappedHandler) {
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mWrappedHandler = wrappedHandler;
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mInnerAnnotationName = innerAnnotationName;
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}
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@Override
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public void handleAnnotation(AnnotationEntry annotation, AnnotationContext context) {
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// Verify that the annotation has the form we expect
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ElementValuePair value = findValue(annotation);
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if (value == null) {
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context.reportError("No value found on %s", annotation.getAnnotationType());
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return;
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}
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Preconditions.checkArgument(value.getValue() instanceof ArrayElementValue);
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ArrayElementValue array = (ArrayElementValue) value.getValue();
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// call wrapped handler on each enclosed annotation:
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for (ElementValue v : array.getElementValuesArray()) {
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Preconditions.checkArgument(v instanceof AnnotationElementValue);
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AnnotationElementValue aev = (AnnotationElementValue) v;
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Preconditions.checkArgument(
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aev.getAnnotationEntry().getAnnotationType().equals(mInnerAnnotationName));
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mWrappedHandler.handleAnnotation(aev.getAnnotationEntry(), context);
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}
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}
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private ElementValuePair findValue(AnnotationEntry a) {
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for (ElementValuePair property : a.getElementValuePairs()) {
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if (property.getNameString().equals(VALUE)) {
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return property;
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}
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}
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// not found
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return null;
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}
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}
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