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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.common.collect.Interner;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.util.StringCanonicalizer;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.Root;
import com.google.devtools.build.skyframe.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyKey;
/**
* A descriptor for a glob request, used as the {@link SkyKey} for {@link GlobFunction}.
*
* <p>{@code subdir} must be empty or point to an existing directory.
*
* <p>{@code pattern} must be valid, as indicated by {@code UnixGlob#checkPatternForError}.
*/
@AutoCodec
@ThreadSafe
public final class GlobDescriptor implements SkyKey {
private static final Interner<GlobDescriptor> interner = BlazeInterners.newWeakInterner();
/**
* Returns interned instance based on the parameters.
*
* @param packageId the name of the owner package (must be an existing package)
* @param packageRoot the package root of {@code packageId}
* @param subdir the subdirectory being looked at (must exist and must be a directory. It's
* assumed that there are no other packages between {@code packageName} and {@code subdir}.
* @param pattern a valid glob pattern
* @param excludeDirs true if directories should be excluded from results
*/
@AutoCodec.Instantiator
public static GlobDescriptor create(
PackageIdentifier packageId,
Root packageRoot,
PathFragment subdir,
String pattern,
boolean excludeDirs) {
return interner.intern(
new GlobDescriptor(packageId, packageRoot, subdir, pattern, excludeDirs));
}
private final PackageIdentifier packageId;
private final Root packageRoot;
private final PathFragment subdir;
private final String pattern;
private final boolean excludeDirs;
private GlobDescriptor(
PackageIdentifier packageId,
Root packageRoot,
PathFragment subdir,
String pattern,
boolean excludeDirs) {
this.packageId = Preconditions.checkNotNull(packageId);
this.packageRoot = Preconditions.checkNotNull(packageRoot);
this.subdir = Preconditions.checkNotNull(subdir);
this.pattern = Preconditions.checkNotNull(StringCanonicalizer.intern(pattern));
this.excludeDirs = excludeDirs;
}
@Override
public String toString() {
return String.format(
"<GlobDescriptor packageName=%s packageRoot=%s subdir=%s pattern=%s excludeDirs=%s>",
packageId, packageRoot, subdir, pattern, excludeDirs);
}
/**
* Returns the package that "owns" this glob.
*
* <p>The glob evaluation code ensures that the boundaries of this package are not crossed.
*/
public PackageIdentifier getPackageId() {
return packageId;
}
/** Returns the package root of {@code getPackageId()}. */
public Root getPackageRoot() {
return packageRoot;
}
/**
* Returns the subdirectory of the package under consideration.
*/
public PathFragment getSubdir() {
return subdir;
}
/**
* Returns the glob pattern under consideration. May contain wildcards.
*
* <p>As the glob evaluator traverses deeper into the file tree, components are added at the
* beginning of {@code subdir} and removed from the beginning of {@code pattern}.
*/
public String getPattern() {
return pattern;
}
/**
* Returns true if directories should be excluded from results.
*/
public boolean excludeDirs() {
return excludeDirs;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof GlobDescriptor)) {
return false;
}
GlobDescriptor other = (GlobDescriptor) obj;
return packageId.equals(other.packageId) && packageRoot.equals(other.packageRoot)
&& subdir.equals(other.subdir) && pattern.equals(other.pattern)
&& excludeDirs == other.excludeDirs;
}
@Override
public int hashCode() {
// Generated instead of Objects.hashCode to avoid intermediate array required for latter.
final int prime = 31;
int result = 1;
result = prime * result + (excludeDirs ? 1231 : 1237);
result = prime * result + packageId.hashCode();
result = prime * result + packageRoot.hashCode();
result = prime * result + pattern.hashCode();
result = prime * result + subdir.hashCode();
return result;
}
@Override
public SkyFunctionName functionName() {
return SkyFunctions.GLOB;
}
}
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