com.aspectran.core.context.resource.LocalResourceManager Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008-2022 The Aspectran Project
 *
 * 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.aspectran.core.context.resource;

import com.aspectran.core.util.ResourceUtils;
import com.aspectran.core.util.ToStringBuilder;
import com.aspectran.core.util.logging.Logger;
import com.aspectran.core.util.logging.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * The Class LocalResourceManager.
 *
 * Created: 2014. 12. 18 PM 5:51:13
 */
public class LocalResourceManager extends ResourceManager {

    private static final Logger logger = LoggerFactory.getLogger(LocalResourceManager.class);

    private final String resourceLocation;

    private final int resourceNameStart;

    private final AspectranClassLoader owner;

    public LocalResourceManager(AspectranClassLoader owner) {
        super();

        this.owner = owner;
        this.resourceLocation = null;
        this.resourceNameStart = 0;
    }

    public LocalResourceManager(String resourceLocation, AspectranClassLoader owner) throws InvalidResourceException {
        super();

        this.owner = owner;

        if (resourceLocation != null && !resourceLocation.isEmpty()) {
            File file = new File(resourceLocation);
            if (!file.exists() || !file.canRead()) {
                logger.warn("Resource [" + resourceLocation + "] does not exist or you do not have access");
                this.resourceLocation = null;
                this.resourceNameStart = 0;
                return;
            }
            if (!file.isDirectory() && !resourceLocation.toLowerCase().endsWith(ResourceUtils.JAR_FILE_EXTENSION)) {
                throw new InvalidResourceException("Invalid resource directory or jar file: " + file.getAbsolutePath());
            }

            this.resourceLocation = file.getAbsolutePath();
            this.resourceNameStart = this.resourceLocation.length() + 1;

            findResource(file);
        } else {
            this.resourceLocation = null;
            this.resourceNameStart = 0;
        }
    }

    @Override
    public void reset() throws InvalidResourceException {
        super.reset();

        if (resourceLocation != null) {
            findResource(new File(resourceLocation));
        }
    }

    private void findResource(File file) throws InvalidResourceException {
        try {
            if (file.isDirectory()) {
                List jarFileList = new ArrayList<>();
                findResourceInDir(file, jarFileList);
                if (!jarFileList.isEmpty()) {
                    for (File jarFile : jarFileList) {
                        owner.joinBrother(jarFile.getAbsolutePath());
                    }
                }
            } else {
                findResourceFromJAR(file);
            }
        } catch (Exception e) {
            throw new InvalidResourceException("Failed to find resource from [" + resourceLocation + "]", e);
        }
    }

    private void findResourceInDir(File dir, List jarFileList) {
        dir.listFiles(file -> {
            String filePath = file.getAbsolutePath();
            String resourceName = filePath.substring(resourceNameStart);
            try {
                putResource(resourceName, file);
            } catch (InvalidResourceException e) {
                throw new RuntimeException(e);
            }
            if (file.isDirectory()) {
                findResourceInDir(file, jarFileList);
            } else if (file.isFile()) {
                if (filePath.toLowerCase().endsWith(ResourceUtils.JAR_FILE_EXTENSION)) {
                    jarFileList.add(file);
                }
            }
            return false;
        });
    }

    private void findResourceFromJAR(File target) throws InvalidResourceException, IOException {
        try (JarFile jarFile = new JarFile(target)) {
            for (Enumeration entries = jarFile.entries(); entries.hasMoreElements(); ) {
                JarEntry entry = entries.nextElement();
                putResource(target, entry);
            }
        }
    }

    @Override
    public String toString() {
        ToStringBuilder tsb = new ToStringBuilder();
        tsb.appendForce("resourceLocation", resourceLocation);
        tsb.append("resourceEntries", getResourceEntries());
        tsb.append("owner", owner);
        return tsb.toString();
    }

}