io.smallrye.config.SysPropConfigSource Maven / Gradle / Ivy

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/*
 * Copyright 2017 Red Hat, Inc.
 *
 * 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 io.smallrye.config;

import static io.smallrye.config.common.utils.ConfigSourceUtil.propertiesToMap;
import static java.security.AccessController.doPrivileged;
import static java.util.Collections.unmodifiableMap;

import java.security.PrivilegedAction;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import io.smallrye.config.common.AbstractConfigSource;
import io.smallrye.config.common.utils.ConfigSourceUtil;

/**
 * @author Jeff Mesnil (c) 2017 Red Hat inc.
 */
class SysPropConfigSource extends AbstractConfigSource {
    private static final long serialVersionUID = 9167738611308785403L;
    private static final int DEFAULT_ORDINAL = 400;

    SysPropConfigSource() {
        super("SysPropConfigSource", ConfigSourceUtil.getOrdinalFromMap(getSystemProperties(), DEFAULT_ORDINAL));
    }

    @Override
    public Map getProperties() {
        return getSystemProperties();
    }

    @Override
    public Set getPropertyNames() {
        return getProperties().keySet();
    }

    @Override
    public String getValue(String s) {
        return doPrivileged((PrivilegedAction) () -> System.getProperty(s));
    }

    private static Map getSystemProperties() {
        return unmodifiableMap(propertiesToMap(doPrivileged((PrivilegedAction) System::getProperties)));
    }
}