pluginloader.PluginLoader Maven / Gradle / Ivy

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package pluginloader;

import com.github.javaparser.JavaParser;
import com.github.javaparser.ParseResult;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Modifier;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.PackageDeclaration;
import com.github.javaparser.ast.body.TypeDeclaration;
import pluginloader.load.PluginClassLoader;
import pluginloader.load.PluginCompiler;

import java.lang.reflect.InvocationTargetException;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * This class loads plugins and instantiates them
 */
public class PluginLoader {
    public static class LoadingException extends Exception{
        public LoadingException(String message) {
            super(message);
        }

        public LoadingException(Throwable cause) {
            super(cause);
        }
    }

    private static class ClassInfo{
        private final String className;
        private final String packageName;

        private ClassInfo(String className, String packageName) {
            this.className = className;
            this.packageName = packageName;
        }

        public String getFullQualifiedClassName(){
            String packagePath = "";
            if (packageName != null){
                packagePath = String.format("%s.", packageName);
            }
            return String.format("%s%s", packagePath, className);
        }
    }

    /**
     * Compiles a plugin given as a java class in source code form and loads it into the Java Runtime.
     * It only loads classes that extend the given java class.
     * After successfully loading it, an instance of each found class that extends the given class
     * will be returned to the caller.
     * If a class already exists, it will be updated if its code has changed. If the code has
     * not changed, the loading is skipped and a new instance of the class is returned.
     * @param plugin The string containing the source code of the plugin class
     * @param pluginInterface The interface/class the plugin class has to implement/extend
     * @return OBJECT The new instance of the class
     * @throws LoadingException When something goes wrong while compiling or loading the class
     */
    public