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// Copyright 2014 Google Inc. 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.actions;
import com.google.common.collect.Iterables;
import com.google.common.escape.Escaper;
import com.google.common.escape.Escapers;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.syntax.Label;
/**
* Helper class for actions.
*/
@ThreadSafe
public final class Actions {
private static final Escaper PATH_ESCAPER = Escapers.builder()
.addEscape('_', "_U")
.addEscape('/', "_S")
.addEscape('\\', "_B")
.addEscape(':', "_C")
.build();
/**
* Checks if the two actions are equivalent. This method exists to support sharing actions between
* configured targets for cases where there is no canonical target that could own the action. In
* the action graph construction this case shows up as two actions generating the same output
* file.
*
* <p>This method implements an equivalence relationship across actions, based on the action
* class, the key, and the list of inputs and outputs.
*/
public static boolean canBeShared(Action a, Action b) {
if (!a.getMnemonic().equals(b.getMnemonic())) {
return false;
}
if (!a.getKey().equals(b.getKey())) {
return false;
}
// Don't bother to check input and output counts first; the expected result for these tests is
// to always be true (i.e., that this method returns true).
if (!Iterables.elementsEqual(a.getMandatoryInputs(), b.getMandatoryInputs())) {
return false;
}
if (!Iterables.elementsEqual(a.getOutputs(), b.getOutputs())) {
return false;
}
return true;
}
/**
* Returns the escaped name for a given relative path as a string. This takes
* a short relative path and turns it into a string suitable for use as a
* filename. Invalid filename characters are escaped with an '_' + a single
* character token.
*/
public static String escapedPath(String path) {
return PATH_ESCAPER.escape(path);
}
/**
* Returns a string that is usable as a unique path component for a label. It is guaranteed
* that no other label maps to this string.
*/
public static String escapeLabel(Label label) {
return PATH_ESCAPER.escape(label.getPackageName() + ":" + label.getName());
}
}
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