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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.util;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.annotation.concurrent.Immutable;
/**
* A set of FileTypes for grouped matching.
*/
@Immutable
public class FileTypeSet implements Predicate<String> {
private final ImmutableSet<FileType> types;
/** A set that matches all files. */
public static final FileTypeSet ANY_FILE =
new FileTypeSet() {
@Override
public String toString() {
return "any files";
}
@Override
public boolean matches(String filename) {
return true;
}
@Override
public List<String> getExtensions() {
return ImmutableList.<String>of();
}
};
/** A predicate that matches no files. */
public static final FileTypeSet NO_FILE =
new FileTypeSet(ImmutableList.<FileType>of()) {
@Override
public String toString() {
return "no files";
}
@Override
public boolean matches(String filename) {
return false;
}
};
private FileTypeSet() {
this.types = null;
}
private FileTypeSet(FileType... fileTypes) {
this.types = ImmutableSet.copyOf(fileTypes);
}
private FileTypeSet(Iterable<FileType> fileTypes) {
this.types = ImmutableSet.copyOf(fileTypes);
}
/**
* Returns a set that matches only the provided {@code fileTypes}.
*
* <p>If {@code fileTypes} is empty, the returned predicate will match no files.
*/
public static FileTypeSet of(FileType... fileTypes) {
if (fileTypes.length == 0) {
return FileTypeSet.NO_FILE;
} else {
return new FileTypeSet(fileTypes);
}
}
/**
* Returns a set that matches only the provided {@code fileTypes}.
*
* <p>If {@code fileTypes} is empty, the returned predicate will match no files.
*/
public static FileTypeSet of(Iterable<FileType> fileTypes) {
if (Iterables.isEmpty(fileTypes)) {
return FileTypeSet.NO_FILE;
} else {
return new FileTypeSet(fileTypes);
}
}
/** Returns a copy of this {@link FileTypeSet} including the specified `fileTypes`. */
public FileTypeSet including(FileType... fileTypes) {
return new FileTypeSet(Iterables.concat(this.types, Arrays.asList(fileTypes)));
}
/** Returns true if the filename can be matched by any FileType in this set. */
public boolean matches(String filename) {
int slashIndex = filename.lastIndexOf('/');
if (slashIndex != -1) {
filename = filename.substring(slashIndex + 1);
}
for (FileType type : types) {
if (type.apply(filename)) {
return true;
}
}
return false;
}
/** Returns true if this predicate matches nothing. */
public boolean isNone() {
return this == FileTypeSet.NO_FILE;
}
@Override
public boolean apply(String filename) {
return matches(filename);
}
/** Returns the list of possible file extensions for this file type. Can be empty. */
public List<String> getExtensions() {
List<String> extensions = new ArrayList<>();
for (FileType type : types) {
extensions.addAll(type.getExtensions());
}
return extensions;
}
@Override
public String toString() {
return StringUtil.joinEnglishList(getExtensions());
}
}
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