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// Copyright 2015 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.rules.cpp;
import com.google.common.collect.Lists;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* A list of extra libraries to include in a link. These are non-C++
* libraries that are built from inputs gathered from all the dependencies.
* The dependencies have no way to coordinate, so each one will add an
* ExtraLinkTimeLibrary to its CcLinkParams. ExtraLinkTimeLibrary is an
* interface, and all ExtraLinkTimeLibrary objects of the same class will
* be gathered together.
*/
public final class ExtraLinkTimeLibraries {
/**
* We can have multiple different kinds of lists of libraries to include
* at link time. We map from the class type to an actual instance.
*/
private final Collection<ExtraLinkTimeLibrary> extraLibraries;
private ExtraLinkTimeLibraries(Collection<ExtraLinkTimeLibrary> extraLibraries) {
this.extraLibraries = extraLibraries;
}
/**
* Return the set of extra libraries.
*/
public Collection<ExtraLinkTimeLibrary> getExtraLibraries() {
return extraLibraries;
}
public static final Builder builder() {
return new Builder();
}
/**
* Builder for {@link ExtraLinkTimeLibraries}.
*/
public static final class Builder {
private Map<Class<? extends ExtraLinkTimeLibrary>, ExtraLinkTimeLibrary.Builder> libraries =
new LinkedHashMap<>();
private Builder() {
// Nothing to do.
}
/**
* Build a {@link ExtraLinkTimeLibraries} object.
*/
public ExtraLinkTimeLibraries build() {
List<ExtraLinkTimeLibrary> extraLibraries = Lists.newArrayList();
for (ExtraLinkTimeLibrary.Builder builder : libraries.values()) {
extraLibraries.add(builder.build());
}
return new ExtraLinkTimeLibraries(extraLibraries);
}
/**
* Add a transitive dependency.
*/
public final Builder addTransitive(ExtraLinkTimeLibraries dep) {
for (ExtraLinkTimeLibrary depLibrary : dep.getExtraLibraries()) {
Class<? extends ExtraLinkTimeLibrary> c = depLibrary.getClass();
if (!libraries.containsKey(c)) {
libraries.put(c, depLibrary.getBuilder());
}
libraries.get(c).addTransitive(depLibrary);
}
return this;
}
/**
* Add a single library to build.
*/
public final Builder add(ExtraLinkTimeLibrary b) {
Class<? extends ExtraLinkTimeLibrary> c = b.getClass();
if (!libraries.containsKey(c)) {
libraries.put(c, b.getBuilder());
}
libraries.get(c).addTransitive(b);
return this;
}
}
}
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