// 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.util;
import com.google.common.base.Function;
import com.google.common.collect.Interner;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
/**
* Static singleton holder for the string interning pool. Doesn't use {@link String#intern}
* because that consumes permgen space.
*/
public final class StringCanonicalizer {
private static final Interner<String> interner = BlazeInterners.newWeakInterner();
/** Functional interface, for use with e.g. transform */
public static final Function<String, String> INTERN = new Function<String, String>() {
@Override
public String apply(String x) {
return intern(x);
}
};
private StringCanonicalizer() {
}
/**
* Interns a String.
*/
public static final String intern(String arg) {
return interner.intern(arg);
}
}