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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.testutil;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.packages.AbstractAttributeMapper;
import com.google.devtools.build.lib.syntax.Type;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Faked implementation of {@link AbstractAttributeMapper} for use in testing.
*/
public class FakeAttributeMapper extends AbstractAttributeMapper {
private final Map<String, FakeAttributeMapperEntry<?>> attrs;
private FakeAttributeMapper(Map<String, FakeAttributeMapperEntry<?>> attrs) {
super(null, null, null, null);
this.attrs = ImmutableMap.copyOf(attrs);
}
@Override
@Nullable
public <T> T get(String attributeName, Type<T> type) {
FakeAttributeMapperEntry<?> entry = attrs.get(attributeName);
if (entry == null) {
// Not specified in attributes or defaults
assertWithMessage("Attribute " + attributeName + " not in attributes!").fail();
return null;
}
return entry.validateAndGet(type);
}
@Override
public boolean isAttributeValueExplicitlySpecified(String attributeName) {
return attrs.containsKey(attributeName);
}
public static FakeAttributeMapper empty() {
return builder().build();
}
public static Builder builder() {
return new Builder();
}
/**
* Builder to construct a {@link FakeAttributeMapper}. If no attributes are needed, use {@link
* #empty()} instead.
*/
public static class Builder {
private final ImmutableMap.Builder<String, FakeAttributeMapperEntry<?>> mapBuilder =
ImmutableMap.builder();
private Builder() { }
public Builder withStringList(String attribute, List<String> value) {
mapBuilder.put(attribute, FakeAttributeMapperEntry.forStringList(value));
return this;
}
public FakeAttributeMapper build() {
return new FakeAttributeMapper(mapBuilder.build());
}
}
private static class FakeAttributeMapperEntry<T> {
private final Type<T> type;
private final T value;
private FakeAttributeMapperEntry(Type<T> type, T value) {
this.type = type;
this.value = value;
}
private static FakeAttributeMapperEntry<List<String>> forStringList(List<String> list) {
return new FakeAttributeMapperEntry<>(Type.STRING_LIST, list);
}
private <U> U validateAndGet(Type<U> otherType) {
assertThat(type).isSameAs(otherType);
return otherType.cast(value);
}
}
}
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