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// Copyright 2016 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.android.desugar.testdata;
import com.google.devtools.build.android.desugar.testdata.separate.SeparateBaseClass;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
public class MethodReference extends SeparateBaseClass<String> {
private final List<String> names;
public MethodReference(List<String> names) {
super(names);
this.names = names;
}
// Class method reference
public void appendAll(StringBuilder dest) {
names.stream().forEach(dest::append);
}
// Interface method reference (regression test for b/33304582)
public List<String> transform(Transformer<String> transformer) {
return names.stream().map(transformer::transform).collect(Collectors.toList());
}
// Private method reference (regression test for b/33378312)
public List<String> some() {
return names.stream().filter(MethodReference::startsWithS).collect(Collectors.toList());
}
// Protected method reference in a base class of another package (regression test for b/33378312)
public List<String> intersect(List<String> other) {
return other.stream().filter(this::contains).collect(Collectors.toList());
}
// Contains the same method reference as intersect
public List<String> onlyIn(List<String> other) {
Predicate<String> p = this::contains;
return other.stream().filter(p.negate()).collect(Collectors.toList());
}
// Private method reference to an instance method that throws (regression test for b/33378312)
public Callable<String> stringer() {
return this::throwing;
}
/** Returns a method reference derived from an expression (object.toString()). */
public static Function<Integer, Character> stringChars(Object object) {
return (object == null ? "" : object.toString())::charAt;
}
/** Returns a method reference derived from a field */
public Predicate<String> toPredicate() {
return names::contains;
}
private static boolean startsWithS(String input) {
return input.startsWith("S");
}
private String throwing() throws Exception {
StringBuilder msg = new StringBuilder();
appendAll(msg);
throw new IOException(msg.toString());
}
/** Interface to create a method reference for in {@link #transform}. */
public interface Transformer<T> {
T transform(T input);
}
}
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