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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.packages;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.FuncallExpression;
import com.google.devtools.build.lib.syntax.MethodDescriptor;
import java.util.Map;
/** Base class for native implementations of {@link Info}. */
// todo(vladmos,dslomov): make abstract once DefaultInfo stops instantiating it.
public class NativeInfo extends Info {
protected final ImmutableMap<String, Object> values;
// Initialized lazily.
private ImmutableSet<String> fieldNames;
@Override
public Object getValue(String name) throws EvalException {
if (values.containsKey(name)) {
return values.get(name);
} else if (hasField(name)) {
MethodDescriptor methodDescriptor = FuncallExpression.getStructField(this.getClass(), name);
try {
return FuncallExpression.invokeStructField(methodDescriptor, name, this);
} catch (InterruptedException exception) {
// Struct fields on NativeInfo objects are supposed to behave well and not throw
// exceptions, as they should be logicless field accessors. If this occurs, it's
// indicative of a bad NativeInfo implementation.
throw new IllegalStateException(
String.format("Access of field %s was unexpectedly interrupted, but should be "
+ "uninterruptible. This is indicative of a bad provider implementation.", name));
}
} else {
return null;
}
}
@Override
public boolean hasField(String name) {
return getFieldNames().contains(name);
}
@Override
public ImmutableCollection<String> getFieldNames() {
if (fieldNames == null) {
fieldNames = ImmutableSet.<String>builder()
.addAll(values.keySet())
.addAll(FuncallExpression.getStructFieldNames(this.getClass()))
.build();
}
return fieldNames;
}
public NativeInfo(Provider provider) {
this(provider, Location.BUILTIN);
}
public NativeInfo(Provider provider, Location loc) {
this(provider, ImmutableMap.of(), loc);
}
// TODO(cparsons): Remove this constructor once ToolchainInfo stops using it.
@Deprecated
public NativeInfo(Provider provider, Map<String, Object> values, Location loc) {
super(provider, loc);
this.values = copyValues(values);
}
}
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