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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.vfs;
import com.google.common.collect.ImmutableSet;
import java.util.Objects;
import javax.annotation.Nullable;
/**
* An immutable set of modified source files. The scope of these files is context-dependent; in some
* uses this may mean information about all files in the client, while in other uses this may mean
* information about some specific subset of files. {@link #EVERYTHING_MODIFIED} can be used to
* indicate that all files of interest have been modified.
*/
public final class ModifiedFileSet {
public static final ModifiedFileSet EVERYTHING_MODIFIED = new ModifiedFileSet(null);
public static final ModifiedFileSet NOTHING_MODIFIED = new ModifiedFileSet(
ImmutableSet.<PathFragment>of());
@Nullable private final ImmutableSet<PathFragment> modified;
/**
* Whether all files of interest should be treated as potentially modified.
*/
public boolean treatEverythingAsModified() {
return modified == null;
}
/**
* The set of files of interest that were modified.
*
* @throws IllegalStateException if {@link #treatEverythingAsModified} returns true.
*/
public ImmutableSet<PathFragment> modifiedSourceFiles() {
if (treatEverythingAsModified()) {
throw new IllegalStateException();
}
return modified;
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof ModifiedFileSet)) {
return false;
}
ModifiedFileSet other = (ModifiedFileSet) o;
return Objects.equals(modified, other.modified);
}
@Override
public int hashCode() {
return Objects.hashCode(modified);
}
@Override
public String toString() {
if (this.equals(EVERYTHING_MODIFIED)) {
return "EVERYTHING_MODIFIED";
} else if (this.equals(NOTHING_MODIFIED)) {
return "NOTHING_MODIFIED";
} else {
return modified.toString();
}
}
private ModifiedFileSet(ImmutableSet<PathFragment> modified) {
this.modified = modified;
}
/**
* The builder for {@link ModifiedFileSet}.
*/
public static class Builder {
private final ImmutableSet.Builder<PathFragment> setBuilder =
ImmutableSet.<PathFragment>builder();
public ModifiedFileSet build() {
ImmutableSet<PathFragment> modified = setBuilder.build();
return modified.isEmpty() ? NOTHING_MODIFIED : new ModifiedFileSet(modified);
}
public Builder modify(PathFragment pathFragment) {
setBuilder.add(pathFragment);
return this;
}
public Builder modifyAll(Iterable<PathFragment> pathFragments) {
setBuilder.addAll(pathFragments);
return this;
}
}
public static Builder builder() {
return new Builder();
}
public static ModifiedFileSet union(ModifiedFileSet mfs1, ModifiedFileSet mfs2) {
if (mfs1.treatEverythingAsModified() || mfs2.treatEverythingAsModified()) {
return ModifiedFileSet.EVERYTHING_MODIFIED;
}
if (mfs1.equals(ModifiedFileSet.NOTHING_MODIFIED)) {
return mfs2;
}
if (mfs2.equals(ModifiedFileSet.NOTHING_MODIFIED)) {
return mfs1;
}
return ModifiedFileSet.builder()
.modifyAll(mfs1.modifiedSourceFiles())
.modifyAll(mfs2.modifiedSourceFiles())
.build();
}
}
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