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/*
* Copyright (C) 2015 Square, Inc.
*
* 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.squareup.javapoet;
import static java.lang.Character.isISOControl;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.lang.model.element.Modifier;
/**
* Like Guava, but worse and standalone. This makes it easier to mix JavaPoet with libraries that
* bring their own version of Guava.
*/
final class Util {
private Util() {
}
/** Modifier.DEFAULT doesn't exist until Java 8, but we want to run on earlier releases. */
static final Modifier DEFAULT;
static {
Modifier def = null;
try {
def = Modifier.valueOf("DEFAULT");
} catch (IllegalArgumentException ignored) {
}
DEFAULT = def;
}
static <K, V> Map<K, List<V>> immutableMultimap(Map<K, List<V>> multimap) {
LinkedHashMap<K, List<V>> result = new LinkedHashMap<>();
for (Map.Entry<K, List<V>> entry : multimap.entrySet()) {
if (entry.getValue().isEmpty()) continue;
result.put(entry.getKey(), immutableList(entry.getValue()));
}
return Collections.unmodifiableMap(result);
}
static <K, V> Map<K, V> immutableMap(Map<K, V> map) {
return Collections.unmodifiableMap(new LinkedHashMap<>(map));
}
static void checkArgument(boolean condition, String format, Object... args) {
if (!condition) throw new IllegalArgumentException(String.format(format, args));
}
static <T> T checkNotNull(T reference, String format, Object... args) {
if (reference == null) throw new NullPointerException(String.format(format, args));
return reference;
}
static void checkState(boolean condition, String format, Object... args) {
if (!condition) throw new IllegalStateException(String.format(format, args));
}
static <T> List<T> immutableList(List<T> list) {
return Collections.unmodifiableList(new ArrayList<>(list));
}
static <T> Set<T> immutableSet(Collection<T> set) {
return Collections.unmodifiableSet(new LinkedHashSet<>(set));
}
static String join(String separator, List<String> parts) {
if (parts.isEmpty()) return "";
StringBuilder result = new StringBuilder();
result.append(parts.get(0));
for (int i = 1; i < parts.size(); i++) {
result.append(separator).append(parts.get(i));
}
return result.toString();
}
static <T> Set<T> union(Set<T> a, Set<T> b) {
Set<T> result = new LinkedHashSet<>();
result.addAll(a);
result.addAll(b);
return result;
}
static void requireExactlyOneOf(Set<Modifier> modifiers, Modifier... mutuallyExclusive) {
int count = 0;
for (Modifier modifier : mutuallyExclusive) {
if (modifier == null && Util.DEFAULT == null) continue; // Skip 'DEFAULT' if it doesn't exist!
if (modifiers.contains(modifier)) count++;
}
checkArgument(count == 1, "modifiers %s must contain one of %s",
modifiers, Arrays.toString(mutuallyExclusive));
}
static boolean hasDefaultModifier(Collection<Modifier> modifiers) {
return DEFAULT != null && modifiers.contains(DEFAULT);
}
static String characterLiteralWithoutSingleQuotes(char c) {
// see https://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.10.6
switch (c) {
case '\b': return "\\b"; /* \u0008: backspace (BS) */
case '\t': return "\\t"; /* \u0009: horizontal tab (HT) */
case '\n': return "\\n"; /* \u000a: linefeed (LF) */
case '\f': return "\\f"; /* \u000c: form feed (FF) */
case '\r': return "\\r"; /* \u000d: carriage return (CR) */
case '\"': return "\""; /* \u0022: double quote (") */
case '\'': return "\\'"; /* \u0027: single quote (') */
case '\\': return "\\"; /* \u005c: backslash (\) */
default:
return isISOControl(c) ? String.format("\\u%04x", (int) c) : Character.toString(c);
}
}
/** Returns the string literal representing {@code value}, including wrapping double quotes. */
static String stringLiteralWithDoubleQuotes(String value, String indent) {
StringBuilder result = new StringBuilder(value.length() + 2);
result.append('"');
for (int i = 0; i < value.length(); i++) {
char c = value.charAt(i);
// trivial case: single quote must not be escaped
if (c == '\'') {
result.append("'");
continue;
}
// default case: just let character literal do its work
result.append(characterLiteralWithoutSingleQuotes(c));
// need to append indent after linefeed?
if (c == '\n' && i + 1 < value.length()) {
result.append("\"\n").append(indent).append(indent).append("+ \"");
}
}
result.append('"');
return result.toString();
}
}
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