91 lines
2.8 KiB
Java
91 lines
2.8 KiB
Java
/**
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* ProtocolLib - Bukkit server library that allows access to the Minecraft protocol. Copyright (C) 2012 Kristian S.
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* Stangeland
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* <p>
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* This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
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* version.
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* <p>
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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* <p>
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* You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package com.comphenix.protocol.utility;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Optional;
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/**
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* Represents a dynamic package and an arbitrary number of cached classes.
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*
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* @author Kristian
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*/
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final class CachedPackage {
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private final String packageName;
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private final ClassSource source;
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private final Map<String, Optional<Class<?>>> cache;
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/**
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* Construct a new cached package.
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*
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* @param packageName - the name of the current package.
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* @param source - the class source.
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*/
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public CachedPackage(String packageName, ClassSource source) {
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this.source = source;
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this.packageName = packageName;
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this.cache = new HashMap<>();
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}
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/**
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* Correctly combine a package name and the child class we're looking for.
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*
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* @param packageName - name of the package, or an empty string for the default package.
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* @param className - the class name.
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* @return We full class path.
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*/
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public static String combine(String packageName, String className) {
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if (packageName == null || packageName.isEmpty()) {
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return className;
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} else {
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return packageName + "." + className;
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}
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}
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/**
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* Associate a given class with a class name.
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*
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* @param className - class name.
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* @param clazz - type of class.
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*/
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public void setPackageClass(String className, Class<?> clazz) {
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if (clazz != null) {
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this.cache.put(className, Optional.of(clazz));
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} else {
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this.cache.remove(className);
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}
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}
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/**
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* Retrieve the class object of a specific class in the current package.
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*
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* @param className - the specific class.
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* @return Class object.
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* @throws RuntimeException If we are unable to find the given class.
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*/
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public Optional<Class<?>> getPackageClass(final String className) {
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return this.cache.computeIfAbsent(className, x -> {
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try {
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return Optional.ofNullable(this.source.loadClass(combine(this.packageName, className)));
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} catch (ClassNotFoundException ex) {
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return Optional.empty();
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}
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});
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}
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}
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