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// Copyright 2014 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.pkgcache;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.packages.TargetUtils;
import java.util.Objects;
/**
* Utility class for predefined filtering policies.
*/
public final class FilteringPolicies {
public static final FilteringPolicy NO_FILTER = new NoFilter();
public static final FilteringPolicy FILTER_MANUAL = new FilterManual();
public static final FilteringPolicy FILTER_TESTS = new FilterTests();
public static final FilteringPolicy RULES_ONLY = new RulesOnly();
/** Returns the result of applying y, if target passes x. */
public static FilteringPolicy and(final FilteringPolicy x, final FilteringPolicy y) {
return new AndFilteringPolicy(x, y);
}
private FilteringPolicies() {
}
/**
* Base class for singleton filtering policies.
*/
private abstract static class AbstractFilteringPolicy implements FilteringPolicy {
@Override
public int hashCode() {
return getClass().getSimpleName().hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (obj == this) {
return true;
}
return getClass().equals(obj.getClass());
}
}
private static class NoFilter extends AbstractFilteringPolicy {
@Override
public boolean shouldRetain(Target target, boolean explicit) {
return true;
}
}
private static class FilterManual extends AbstractFilteringPolicy {
@Override
public boolean shouldRetain(Target target, boolean explicit) {
return explicit || !(TargetUtils.hasManualTag(target));
}
}
private static class FilterTests extends AbstractFilteringPolicy {
@Override
public boolean shouldRetain(Target target, boolean explicit) {
return TargetUtils.isTestOrTestSuiteRule(target)
&& FILTER_MANUAL.shouldRetain(target, explicit);
}
}
private static class RulesOnly extends AbstractFilteringPolicy {
@Override
public boolean shouldRetain(Target target, boolean explicit) {
return target instanceof Rule;
}
}
/** FilteringPolicy for combining FilteringPolicies. */
public static class AndFilteringPolicy implements FilteringPolicy {
private final FilteringPolicy firstPolicy;
private final FilteringPolicy secondPolicy;
private AndFilteringPolicy(FilteringPolicy firstPolicy, FilteringPolicy secondPolicy) {
this.firstPolicy = Preconditions.checkNotNull(firstPolicy);
this.secondPolicy = Preconditions.checkNotNull(secondPolicy);
}
@Override
public boolean shouldRetain(Target target, boolean explicit) {
return firstPolicy.shouldRetain(target, explicit)
&& secondPolicy.shouldRetain(target, explicit);
}
public FilteringPolicy getFirstPolicy() {
return firstPolicy;
}
public FilteringPolicy getSecondPolicy() {
return secondPolicy;
}
@Override
public int hashCode() {
return Objects.hash(firstPolicy, secondPolicy);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof AndFilteringPolicy)) {
return false;
}
AndFilteringPolicy other = (AndFilteringPolicy) obj;
return other.firstPolicy.equals(firstPolicy) && other.secondPolicy.equals(secondPolicy);
}
}
}
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