/
ImportOrderStep.java
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/
ImportOrderStep.java
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/*
* Copyright 2016-2024 DiffPlug
*
* 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.diffplug.spotless.java;
import static com.diffplug.spotless.java.LibJavaPreconditions.requireElementsNonNull;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeSet;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.annotation.Nullable;
import com.diffplug.spotless.FormatterFunc;
import com.diffplug.spotless.FormatterStep;
import com.diffplug.spotless.SerializedFunction;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
public final class ImportOrderStep implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private static final boolean WILDCARDS_LAST_DEFAULT = false;
private static final boolean SEMANTIC_SORT_DEFAULT = false;
private static final Set<String> TREAT_AS_PACKAGE_DEFAULT = Set.of();
private static final Set<String> TREAT_AS_CLASS_DEFAULT = Set.of();
private final String lineFormat;
public static ImportOrderStep forGroovy() {
return new ImportOrderStep("import %s");
}
public static ImportOrderStep forJava() {
return new ImportOrderStep("import %s;");
}
private ImportOrderStep(String lineFormat) {
this.lineFormat = lineFormat;
}
public FormatterStep createFrom(String... importOrder) {
return createFrom(WILDCARDS_LAST_DEFAULT, SEMANTIC_SORT_DEFAULT, TREAT_AS_PACKAGE_DEFAULT,
TREAT_AS_CLASS_DEFAULT, importOrder);
}
public FormatterStep createFrom(boolean wildcardsLast, boolean semanticSort, Set<String> treatAsPackage,
Set<String> treatAsClass, String... importOrder) {
// defensive copying and null checking
List<String> importOrderList = requireElementsNonNull(Arrays.asList(importOrder));
return createFrom(wildcardsLast, semanticSort, treatAsPackage, treatAsClass, () -> importOrderList);
}
public FormatterStep createFrom(File importsFile) {
return createFrom(WILDCARDS_LAST_DEFAULT, SEMANTIC_SORT_DEFAULT, TREAT_AS_PACKAGE_DEFAULT,
TREAT_AS_CLASS_DEFAULT, importsFile);
}
public FormatterStep createFrom(boolean wildcardsLast, boolean semanticSort, Set<String> treatAsPackage,
Set<String> treatAsClass, File importsFile) {
Objects.requireNonNull(importsFile);
return createFrom(wildcardsLast, semanticSort, treatAsPackage, treatAsClass, () -> getImportOrder(importsFile));
}
private FormatterStep createFrom(boolean wildcardsLast, boolean semanticSort, Set<String> treatAsPackage,
Set<String> treatAsClass, Supplier<List<String>> importOrder) {
return FormatterStep.create("importOrder",
new State(importOrder.get(), lineFormat, wildcardsLast, semanticSort, treatAsPackage, treatAsClass),
SerializedFunction.identity(),
State::toFormatter);
}
@SuppressFBWarnings("RCN_REDUNDANT_NULLCHECK_WOULD_HAVE_BEEN_A_NPE") // workaround https://github.com/spotbugs/spotbugs/issues/756
private static List<String> getImportOrder(File importsFile) {
try (Stream<String> lines = Files.lines(importsFile.toPath())) {
return lines.filter(line -> !line.startsWith("#"))
// parse 0=input
.map(ImportOrderStep::splitIntoIndexAndName)
.sorted(Map.Entry.comparingByKey())
.map(Map.Entry::getValue)
.collect(Collectors.toCollection(ArrayList::new));
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private static Map.Entry<Integer, String> splitIntoIndexAndName(String line) {
String[] pieces = line.split("=");
Integer index = Integer.valueOf(pieces[0]);
String name = pieces.length == 2 ? pieces[1] : "";
return new SimpleImmutableEntry<>(index, name);
}
private static final class State implements Serializable {
private static final long serialVersionUID = 1L;
private final List<String> importOrder;
private final String lineFormat;
private final boolean wildcardsLast;
private final boolean semanticSort;
private final TreeSet<String> treatAsPackage;
private final TreeSet<String> treatAsClass;
State(List<String> importOrder,
String lineFormat,
boolean wildcardsLast,
boolean semanticSort,
@Nullable Set<String> treatAsPackage,
@Nullable Set<String> treatAsClass) {
this.importOrder = importOrder;
this.lineFormat = lineFormat;
this.wildcardsLast = wildcardsLast;
this.semanticSort = semanticSort;
this.treatAsPackage = treatAsPackage == null ? null : new TreeSet<>(treatAsPackage);
this.treatAsClass = treatAsClass == null ? null : new TreeSet<>(treatAsClass);
}
FormatterFunc toFormatter() {
return raw -> new ImportSorter(importOrder, wildcardsLast, semanticSort, treatAsPackage, treatAsClass)
.format(raw, lineFormat);
}
}
}