com.qualogy.qafe.business.resource.java.JavaClass.java Source code

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Here is the source code for com.qualogy.qafe.business.resource.java.JavaClass.java

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/**
 * Copyright 2008-2015 Qualogy Solutions B.V.
 *
 * 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.qualogy.qafe.business.resource.java;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.List;

import org.apache.commons.lang.builder.ToStringBuilder;

import com.qualogy.qafe.bind.ValidationException;
import com.qualogy.qafe.bind.commons.type.Parameter;
import com.qualogy.qafe.bind.core.application.ApplicationContext;
import com.qualogy.qafe.bind.io.FileLocation;
import com.qualogy.qafe.bind.resource.BindResource;
import com.qualogy.qafe.bind.resource.JavaResource;
import com.qualogy.qafe.business.resource.Resource;
import com.qualogy.qafe.business.resource.ResourceInitializationException;
import com.qualogy.qafe.core.io.jar.ExternalClassLoader;

public class JavaClass extends Resource {

    private Object instance = null;
    private ClassInfo info = null;
    private ClassLoader externalClassLoader = null;

    public JavaClass(BindResource resource) {
        super(resource);
    }

    public void init(ApplicationContext context) {

        FileLocation jarLocation = ((JavaResource) getBindResource()).getJarfileLocation();

        if (jarLocation != null)
            externalClassLoader = ExternalClassLoader.create(jarLocation.toURI());

        this.instance = createInstance((JavaResource) getBindResource());

        this.info = ClassInfo.create(this.instance.getClass());
    }

    /**
     * Create an instance of a class with the given classname, 
     * @param string 
     * @param clazz
     * @throws thrown when anything goes wrong upon creation or finding the class an UnableToProcessExecption is thrown
     * @return
     */
    private Object createInstance(JavaResource resource) {

        Class<?> clazz = null;
        try {
            clazz = createClass(resource.getClassName());
        } catch (ClassNotFoundException e) {
            throw new ResourceInitializationException(e);
        }

        return createInstance(clazz, resource);
    }

    private Object createInstance(Class<?> clazz, JavaResource resource) {
        Object instance = null;
        try {
            //         List<Parameter> arguments = resource.getArguments();
            //         if(arguments!=null){
            //            Collections.sort(arguments);
            //            for (Parameter argument : arguments) {
            //               argument.get
            //            }
            //         }
            Constructor<?> constructor = clazz.getDeclaredConstructor(new Class[] {});
            constructor.setAccessible(true);
            instance = constructor.newInstance(new Object[] {});
        } catch (NoSuchMethodException e) {
            throw new ResourceInitializationException("possible error; no default constructor", e);
        } catch (InvocationTargetException e) {
            throw new ResourceInitializationException(e);
        } catch (IllegalAccessException e) {
            throw new ResourceInitializationException(e);
        } catch (InstantiationException e) {
            throw new ResourceInitializationException(e);
        }
        return instance;
    }

    private Class<?> createClass(String className) throws ClassNotFoundException {
        Class<?> clazz = null;

        if (externalClassLoader != null) {
            clazz = externalClassLoader.loadClass(className);
        } else {
            clazz = Class.forName(className);
        }
        return clazz;
    }

    public ClassLoader getExternalClassLoader() {
        return externalClassLoader;
    }

    public Object getInstance() {
        return instance;
    }

    public Method getMethod(String methodName, Class<?>[] parameterClasses) throws NoSuchMethodException {
        return info.getMethod(methodName, parameterClasses);
    }

    public String toLogString() {
        return ToStringBuilder.reflectionToString(instance);
    }

    public boolean isEqualTo(Resource otherResource) {
        return false;
    }

    public void destroy() {
    }

    public void validate() throws ValidationException {
        if (((JavaResource) getBindResource()).getClassName() == null)
            throw new ValidationException("classname must be set for resource type javaclass");
    }

    public void destroy(ApplicationContext context) {
    }
}