org.springframework.aot.generate.MethodName Maven / Gradle / Ivy
/*
* Copyright 2002-2023 the original author or authors.
*
* 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
*
* https://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 org.springframework.aot.generate;
import java.util.Arrays;
import java.util.stream.Collectors;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* A camel-case method name that can be built from distinct parts.
*
* @author Phillip Webb
* @since 6.0
*/
final class MethodName {
private static final String[] PREFIXES = { "get", "set", "is" };
/**
* An empty method name.
*/
public static final MethodName NONE = of();
private final String value;
private MethodName(String value) {
this.value = value;
}
/**
* Create a new method name from the specific parts. The returned name will
* be in camel-case and will only contain valid characters from the parts.
* @param parts the parts the form the name
* @return a method name instance
*/
static MethodName of(String... parts) {
Assert.notNull(parts, "'parts' must not be null");
return new MethodName(join(parts));
}
/**
* Create a new method name by concatenating the specified name to this name.
* @param name the name to concatenate
* @return a new method name instance
*/
MethodName and(MethodName name) {
Assert.notNull(name, "'name' must not be null");
return and(name.value);
}
/**
* Create a new method name by concatenating the specified parts to this name.
* @param parts the parts to concatenate
* @return a new method name instance
*/
MethodName and(String... parts) {
Assert.notNull(parts, "'parts' must not be null");
String joined = join(parts);
String prefix = getPrefix(joined);
String suffix = joined.substring(prefix.length());
return of(prefix, this.value, suffix);
}
private String getPrefix(String name) {
for (String candidate : PREFIXES) {
if (name.startsWith(candidate)) {
return candidate;
}
}
return "";
}
@Override
public int hashCode() {
return this.value.hashCode();
}
@Override
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
}
if ((obj == null) || (getClass() != obj.getClass())) {
return false;
}
return this.value.equals(((MethodName) obj).value);
}
@Override
public String toString() {
return (!StringUtils.hasLength(this.value)) ? "$$aot" : this.value ;
}
private static String join(String[] parts) {
return StringUtils.uncapitalize(Arrays.stream(parts).map(MethodName::clean)
.map(StringUtils::capitalize).collect(Collectors.joining()));
}
private static String clean(@Nullable String part) {
char[] chars = (part != null) ? part.toCharArray() : new char[0];
StringBuilder name = new StringBuilder(chars.length);
boolean uppercase = false;
for (char ch : chars) {
char outputChar = (!uppercase) ? ch : Character.toUpperCase(ch);
name.append((!Character.isLetter(ch)) ? "" : outputChar);
uppercase = (ch == '.');
}
return name.toString();
}
}