org.gridgain.grid.spi.deployment.uri.GridUriDeploymentFileResourceLoader Maven / Gradle / Ivy

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Java-based middleware for in-memory processing of big data in a distributed environment.

There is a newer version: 6.6.9-p1

/* 
 Copyright (C) GridGain Systems. All Rights Reserved.
 
 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 org.gridgain.grid.spi.deployment.uri;

import org.gridgain.grid.compute.*;
import org.gridgain.grid.spi.*;
import java.io.*;

/**
 * Class loader helper that could load class from the file using certain
 * class loader.
 */
class GridUriDeploymentFileResourceLoader {
    /** Class loader class should be loaded by. */
    private final ClassLoader clsLdr;

    /** Initial directory. */
    private final File scanPathDir;

    /**
     * Creates new instance of loader helper.
     *
     * @param clsLdr Class loader class should be loaded by.
     * @param scanPathDir Initial directory.
     */
    GridUriDeploymentFileResourceLoader(ClassLoader clsLdr, File scanPathDir) {
        this.clsLdr = clsLdr;
        this.scanPathDir = scanPathDir;
    }

    /**
     * Creates new class from file with given file name.
     *
     * @param fileName Name of the class to be loaded. It might be either
     *      fully-qualified or just a class name.
     * @param ignoreUnknownRsrc Whether unresolved classes should be
     *      ignored or not.
     * @return Loaded class.
     * @throws GridSpiException If class could not be loaded and
     *      {@code ignoreUnknownRsrc} parameter is {@code true}.
     */
    @SuppressWarnings("unchecked")
    Class> createResource(String fileName, boolean ignoreUnknownRsrc) throws GridSpiException {
        if (scanPathDir.isDirectory())
            fileName = fileName.substring(scanPathDir.getAbsolutePath().length() + 1);

        if (fileName.endsWith(".class")) {
            String str = fileName;

            // Replace separators.
            str = str.replaceAll("\\/|\\\\", ".");

            // Strip off '.class' extention.
            str = str.substring(0, str.indexOf(".class"));

            try {
                return (Class>)clsLdr.loadClass(str);
            }
            catch (ClassNotFoundException e) {
                if (ignoreUnknownRsrc) {
                    // No-op.
                }
                else
                    throw new GridSpiException("Failed to load class: " + str, e);
            }
        }

        // Not a class resource.
        return null;
    }
}