FilesystemConfSource.java

/*
 * Copyright 2013 NGDATA nv
 * Copyright 2007 Outerthought bvba and Schaubroeck nv
 *
 * 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.lilyproject.runtime.configuration;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class FilesystemConfSource extends ConfSource {
    private File baseDir;

    public FilesystemConfSource(File baseDir) {
        super(baseDir.getAbsolutePath());
        this.baseDir = baseDir;
    }

    protected List<ConfigPath> getConfigFiles() {
        List<ConfigPath> configPaths = new ArrayList<ConfigPath>();
        collectConfigFiles(baseDir, configPaths, baseDir);
        return configPaths;
    }

    private void collectConfigFiles(File dir, List<ConfigPath> configPaths, File rootDir) {
        File[] files = dir.listFiles(CONFIG_FILE_FILTER);
        if (files != null) {
            for (File file : files) {
                if (file.isDirectory()) {
                    collectConfigFiles(file, configPaths, rootDir);
                } else {
                    String path = getConfigPathForFile(file, rootDir);
                    if (path.endsWith(CONFIG_FILE_EXT)) { // should be the case
                        path = path.substring(0, path.length() - CONFIG_FILE_EXT.length());
                    }
                    configPaths.add(new ConfigPath(path, new FilesystemConfigFile(file)));
                }
            }
        }
    }

    private String getConfigPathForFile(File file, File reference) {
        File parent = file.getParentFile();
        if (parent != null && !parent.equals(reference)) {
            return getConfigPathForFile(parent, reference) + "/" + file.getName();
        } else if (parent != null) {
            return file.getName();
        } else {
            return "";
        }
    }

    private static final FileFilter CONFIG_FILE_FILTER = new FileFilter() {
        public boolean accept(File pathname) {
            return acceptFileName(pathname.isDirectory(), pathname.getName());
        }
    };

    private static class FilesystemConfigFile implements ConfigFile {
        private File file;

        public FilesystemConfigFile(File file) {
            this.file = file;
        }

        public InputStream getInputStream() throws IOException {
            return new BufferedInputStream(new FileInputStream(file));
        }

        public String getPath() {
            return file.getAbsolutePath();
        }

        public long lastModified() {
            return file.lastModified();
        }
    }
}