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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.syntax;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.collect.ForwardingList;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;
import com.google.common.collect.Iterables;
import java.util.ArrayList;
import java.util.List;
/**
* Glob matches and information about glob patterns, which are useful to
* ide_build_info. Its implementation of the List interface is as an immutable
* list of the matching files. Glob criteria can be retrieved through
* {@link #getCriteria}.
*
* @param <E> the element this List contains (generally either String or Label)
*/
public class GlobList<E> extends ForwardingList<E> {
/** Include/exclude criteria. */
private final ImmutableList<GlobCriteria> criteria;
/** Matching files (usually either String or Label). */
private final ImmutableList<E> matches;
/**
* Constructs a list with {@code glob()} call results.
*
* @param includes the patterns that the glob includes
* @param excludes the patterns that the glob excludes
* @param matches the filenames that matched the includes/excludes criteria
*/
public static <T> GlobList<T> captureResults(List<String> includes,
List<String> excludes, List<T> matches) {
GlobCriteria criteria = GlobCriteria.fromGlobCall(
ImmutableList.copyOf(includes), ImmutableList.copyOf(excludes));
return new GlobList<>(ImmutableList.of(criteria), matches);
}
/**
* Parses a GlobInfo from its {@link #toExpression} representation.
*/
public static GlobList<String> parse(String text) {
List<GlobCriteria> criteria = new ArrayList<>();
Iterable<String> globs = Splitter.on(" + ").split(text);
for (String glob : globs) {
criteria.add(GlobCriteria.parse(glob));
}
return new GlobList<>(criteria, ImmutableList.<String>of());
}
/**
* Concatenates two lists into a new GlobList. If either of the lists is a
* GlobList, its GlobCriteria are preserved. Otherwise a simple GlobCriteria
* is created to represent the fixed list.
*/
public static <T> GlobList<T> concat(
List<? extends T> list1, List<? extends T> list2) {
// we add the list to both includes and matches, preserving order
Builder<GlobCriteria> criteriaBuilder = ImmutableList.<GlobCriteria>builder();
if (list1 instanceof GlobList<?>) {
criteriaBuilder.addAll(((GlobList<?>) list1).criteria);
} else {
criteriaBuilder.add(GlobCriteria.fromList(list1));
}
if (list2 instanceof GlobList<?>) {
criteriaBuilder.addAll(((GlobList<?>) list2).criteria);
} else {
criteriaBuilder.add(GlobCriteria.fromList(list2));
}
List<T> matches = ImmutableList.copyOf(Iterables.concat(list1, list2));
return new GlobList<>(criteriaBuilder.build(), matches);
}
/**
* Constructs a list with given criteria and matches.
*/
public GlobList(List<GlobCriteria> criteria, List<E> matches) {
Preconditions.checkNotNull(criteria);
Preconditions.checkNotNull(matches);
this.criteria = ImmutableList.copyOf(criteria);
this.matches = ImmutableList.copyOf(matches);
}
/**
* Returns the criteria used to create this list, from which the
* includes/excludes can be retrieved.
*/
public ImmutableList<GlobCriteria> getCriteria() {
return criteria;
}
/**
* Returns a String that represents this glob list as a BUILD expression.
*/
public String toExpression() {
return Joiner.on(" + ").join(criteria);
}
@Override
protected ImmutableList<E> delegate() {
return matches;
}
}
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