com.sangupta.jerry.store.PropertiesUserLocalStore.java Source code

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Here is the source code for com.sangupta.jerry.store.PropertiesUserLocalStore.java

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/**
 *
 * jerry - Common Java Functionality
 * Copyright (c) 2012-2015, Sandeep Gupta
 * 
 * http://sangupta.com/projects/jerry
 * 
 * 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.sangupta.jerry.store;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.Set;

import org.apache.commons.io.FileUtils;

import com.sangupta.jerry.util.AssertUtils;

/**
 * A {@link Properties} based {@link UserLocalStore} that makes use of
 * properties to store all properties.
 * 
 * @author sangupta
 *
 */
public class PropertiesUserLocalStore extends AbstractUserLocalStore {

    protected final File propertiesFile;

    protected final Properties properties;

    public PropertiesUserLocalStore(String folderName, String fileName) {
        super(folderName);

        if (AssertUtils.isEmpty(fileName)) {
            throw new IllegalArgumentException("Filename cannot be null/empty");
        }

        this.propertiesFile = new File(this.dataDirectory, fileName);
        this.properties = new Properties();

        if (this.propertiesFile.exists() && this.propertiesFile.isFile()) {
            try {
                this.properties.load(FileUtils.openInputStream(this.propertiesFile));
            } catch (IOException e) {
                throw new RuntimeException("Unable to read from the data store", e);
            }
        }
    }

    @Override
    public String get(String property) {
        return this.properties.getProperty(property);
    }

    @Override
    public List<String> getAllKeys() {
        List<String> list = new ArrayList<String>();

        Set<Object> set = this.properties.keySet();
        for (Object o : set) {
            list.add(o.toString());
        }

        return list;
    }

    @Override
    public void put(String key, String property) {
        this.properties.put(key, property);
        save();
    }

    @Override
    public void delete(String key) {
        this.properties.remove(key);
        save();
    }

    /**
     * Save the properties back to underlying storage
     * 
     */
    private void save() {
        try {
            this.properties.store(FileUtils.openOutputStream(this.propertiesFile, false),
                    " Updating from Properties data-store");
        } catch (IOException e) {
            throw new RuntimeException("Unable to write to the data store", e);
        }
    }

}