com.google.gerrit.extensions.client.ListOption Maven / Gradle / Ivy
// Copyright (C) 2019 The Android Open Source Project
//
// 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.gerrit.extensions.client;
import com.google.gerrit.extensions.restapi.BadRequestException;
import java.lang.reflect.InvocationTargetException;
import java.util.EnumSet;
import java.util.Set;
/** Enum that can be expressed as a bitset in query parameters. */
public interface ListOption {
int getValue();
static & ListOption> EnumSet fromHexString(Class clazz, String hex)
throws BadRequestException {
int parsed;
try {
parsed = Integer.parseInt(hex, 16);
} catch (IllegalArgumentException e) {
throw new BadRequestException("not a hex-encoded 32-bit integer: " + hex, e);
}
try {
return fromBits(clazz, parsed);
} catch (IllegalArgumentException e) {
throw new BadRequestException(e.getMessage());
}
}
static & ListOption> EnumSet fromBits(Class clazz, int v) {
EnumSet r = EnumSet.noneOf(clazz);
T[] values;
try {
@SuppressWarnings("unchecked")
T[] tmp = (T[]) clazz.getMethod("values").invoke(null);
values = tmp;
} catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
throw new IllegalStateException(e);
}
for (T o : values) {
if ((v & (1 << o.getValue())) != 0) {
r.add(o);
v &= ~(1 << o.getValue());
}
if (v == 0) {
return r;
}
}
if (v != 0) {
throw new IllegalArgumentException(
"unknown " + clazz.getSimpleName() + ": " + Integer.toHexString(v));
}
return r;
}
static & ListOption> String toHex(Set options) {
int v = 0;
for (T option : options) {
v |= 1 << option.getValue();
}
return Integer.toHexString(v);
}
}