org.apache.jclouds.ProviderConfig.java Source code

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Here is the source code for org.apache.jclouds.ProviderConfig.java

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/**
 * Copyright (C) 2016 Ignasi Barrera
 *
 * 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.apache.jclouds;

import static java.util.Objects.requireNonNull;

import java.io.File;
import java.io.IOException;
import java.util.Properties;

import com.google.common.base.Charsets;
import com.google.common.io.Files;

/**
 * Configures a connection to a cloud provider.
 */
public class ProviderConfig {

    private final String identity;
    private final String credential;
    private final Properties overrides;

    /**
     * Loads the provider configuration from the properties file for the
     * provider.
     */
    public static ProviderConfig load(final String provider) throws IOException {
        Properties props = new Properties();
        props.load(ProviderConfig.class.getResourceAsStream("/" + provider + ".properties"));

        String identity = (String) props.remove(provider + ".identity");
        String credential = fileContents((String) props.remove(provider + ".credential"));

        Properties overrides = new Properties();
        for (Object key : props.keySet()) {
            overrides.put(key, readFileOrValue(props, (String) key));
        }

        return new ProviderConfig(identity, credential, overrides);
    }

    /**
     * Reads the value of a property, and if it is a file, reads its contents.
     */
    private static String readFileOrValue(final Properties props, final String key) throws IOException {
        String value = props.getProperty(key);
        return new File(value).canRead() ? fileContents(value) : value;
    }

    /**
     * Reads a given file and returns a String with the contents.
     */
    private static String fileContents(final String path) throws IOException {
        return Files.toString(new File(path), Charsets.UTF_8);
    }

    private ProviderConfig(final String identity, final String credential, final Properties overrides) {
        this.identity = requireNonNull(identity, "identity cannot be null");
        this.credential = requireNonNull(credential, "credential cannot be null");
        this.overrides = requireNonNull(overrides, "overrides cannot be null");
    }

    public String identity() {
        return identity;
    }

    public String credential() {
        return credential;
    }

    public Properties overrides() {
        return overrides;
    }

}