fm.last.moji.local.LocalMojiFile.java Source code

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Here is the source code for fm.last.moji.local.LocalMojiFile.java

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/*
 * Copyright 2012 Last.fm
 *
 *  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 fm.last.moji.local;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Collections;
import java.util.List;

import org.apache.commons.io.FileUtils;

import fm.last.moji.MojiFile;
import fm.last.moji.MojiFileAttributes;

class LocalMojiFile implements MojiFile {

    private final String domain;
    private final File baseDir;
    private String key;
    private final LocalFileNamingStrategy namingStrategy;
    private String storageClass;
    File file;

    LocalMojiFile(LocalFileNamingStrategy namingStrategy, File baseDir, String domain, String key,
            String storageClass) {
        this.namingStrategy = namingStrategy;
        this.baseDir = baseDir;
        this.key = key;
        this.domain = domain;
        this.storageClass = storageClass;
        file = new File(baseDir, namingStrategy.newFileName(domain, key, storageClass));
    }

    LocalMojiFile(LocalFileNamingStrategy namingStrategy, File baseFolder, String domain, String key) {
        this(namingStrategy, baseFolder, domain, key, "");
    }

    @Override
    public boolean exists() throws IOException {
        return file.exists();
    }

    @Override
    public void delete() throws IOException {
        if (!file.exists()) {
            throw new FileNotFoundException(file.getCanonicalPath());
        }
        file.delete();
    }

    @Override
    public InputStream getInputStream() throws IOException {
        if (!file.exists()) {
            throw new FileNotFoundException(file.getCanonicalPath());
        }
        return new FileInputStream(file);
    }

    @Override
    public OutputStream getOutputStream() throws IOException {
        if (!file.exists()) {
            file.createNewFile();
        }
        return new FileOutputStream(file);
    }

    @Override
    public void copyToFile(File destination) throws IOException {
        if (!file.exists()) {
            throw new FileNotFoundException(file.getCanonicalPath());
        }
        FileUtils.copyFile(file, destination);
    }

    @Override
    public long length() throws IOException {
        if (!file.exists()) {
            throw new FileNotFoundException(file.getCanonicalPath());
        }
        return file.length();
    }

    @Override
    public void rename(String newKey) throws IOException {
        if (!file.exists()) {
            throw new FileNotFoundException(file.getCanonicalPath());
        }
        File destination = new File(baseDir, namingStrategy.newFileName(domain, newKey, storageClass));
        file.renameTo(destination);
        file = destination;
        key = newKey;
    }

    @Override
    public List<URL> getPaths() throws IOException {
        return Collections.singletonList(file.toURI().toURL());
    }

    @Override
    public String getKey() {
        return key;
    }

    @Override
    public String getDomain() {
        return domain;
    }

    @Override
    public void modifyStorageClass(String newStorageClass) throws IOException {
        if (storageClass == null) {
            throw new IllegalArgumentException("storageClass == null");
        }
        if (!file.exists()) {
            throw new FileNotFoundException(file.getCanonicalPath());
        }
        file.renameTo(new File(baseDir, namingStrategy.newFileName(domain, key, newStorageClass)));
        this.storageClass = newStorageClass;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("LocalMogileFile [domain=");
        builder.append(domain);
        builder.append(", key=");
        builder.append(key);
        builder.append(", file=");
        builder.append(file);
        builder.append(", storageClass=");
        builder.append(storageClass);
        builder.append("]");
        return builder.toString();
    }

    @Override
    public MojiFileAttributes getAttributes() throws IOException {
        return new LocalMojiFileAttributes(this);
    }

    String getStorageClass() {
        return storageClass;
    }

}