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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.skyframe;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.UnixGlob;
import com.google.devtools.build.skyframe.LegacySkyKey;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
/** A value corresponding to a glob. */
@Immutable
@ThreadSafe
public final class GlobValue implements SkyValue {
public static final GlobValue EMPTY = new GlobValue(
NestedSetBuilder.<PathFragment>emptySet(Order.STABLE_ORDER));
private final NestedSet<PathFragment> matches;
/**
* Create a GlobValue wrapping {@code matches}. {@code matches} must have order
* {@link Order#STABLE_ORDER}.
*/
public GlobValue(NestedSet<PathFragment> matches) {
this.matches = Preconditions.checkNotNull(matches);
Preconditions.checkState(matches.getOrder() == Order.STABLE_ORDER,
"Only STABLE_ORDER is supported, but got %s", matches.getOrder());
}
/**
* Returns glob matches. The matches will be in a deterministic but unspecified order. If a
* particular order is required, the returned iterable should be sorted.
*/
public NestedSet<PathFragment> getMatches() {
return matches;
}
@Override
public boolean equals(Object other) {
if (other == this) {
return true;
}
if (!(other instanceof GlobValue)) {
return false;
}
// shallowEquals() may fail to detect that two equivalent (according to toString())
// NestedSets are equal, but will always detect when two NestedSets are different.
// This makes this implementation of equals() overly strict, but we only call this
// method when doing change pruning, which can accept false negatives.
return getMatches().shallowEquals(((GlobValue) other).getMatches());
}
@Override
public int hashCode() {
return matches.shallowHashCode();
}
/**
* Constructs a {@link SkyKey} for a glob lookup. {@code packageName} is assumed to be an
* existing package. Trying to glob into a non-package is undefined behavior.
*
* @throws InvalidGlobPatternException if the pattern is not valid.
*/
@ThreadSafe
public static SkyKey key(PackageIdentifier packageId, Path packageRoot, String pattern,
boolean excludeDirs, PathFragment subdir) throws InvalidGlobPatternException {
if (pattern.indexOf('?') != -1) {
throw new InvalidGlobPatternException(pattern, "wildcard ? forbidden");
}
String error = UnixGlob.checkPatternForError(pattern);
if (error != null) {
throw new InvalidGlobPatternException(pattern, error);
}
return internalKey(packageId, packageRoot, subdir, pattern, excludeDirs);
}
/**
* Constructs a {@link SkyKey} for a glob lookup.
*
* <p>Do not use outside {@code GlobFunction}.
*/
@ThreadSafe
static SkyKey internalKey(PackageIdentifier packageId, Path packageRoot, PathFragment subdir,
String pattern, boolean excludeDirs) {
return LegacySkyKey.create(
SkyFunctions.GLOB,
new GlobDescriptor(packageId, packageRoot, subdir, pattern, excludeDirs));
}
/**
* Constructs a {@link SkyKey} for a glob lookup.
*
* <p>Do not use outside {@code GlobFunction}.
*/
@ThreadSafe
static SkyKey internalKey(GlobDescriptor glob, String subdirName) {
return internalKey(glob.packageId, glob.packageRoot, glob.subdir.getRelative(subdirName),
glob.pattern, glob.excludeDirs);
}
/**
* An exception that indicates that a glob pattern is syntactically invalid.
*/
@ThreadSafe
public static final class InvalidGlobPatternException extends Exception {
private final String pattern;
InvalidGlobPatternException(String pattern, String error) {
super(error);
this.pattern = pattern;
}
@Override
public String toString() {
return String.format("invalid glob pattern '%s': %s", pattern, getMessage());
}
}
}
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