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A dynamic, easy, highly customizable scripting language.

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/*
 * Copyright (c) 2013-2018, João Vitor Verona Biazibetti - All Rights Reserved
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see .
 *
 * https://www.github.com/BloodShura
 */

package com.github.bloodshura.x.venus.library.system;

import com.github.bloodshura.x.sys.XSystem;
import com.github.bloodshura.x.venus.exception.runtime.ScriptRuntimeException;
import com.github.bloodshura.x.venus.executor.Context;
import com.github.bloodshura.x.venus.function.FunctionCallDescriptor;
import com.github.bloodshura.x.venus.function.Method;
import com.github.bloodshura.x.venus.function.annotation.MethodArgs;
import com.github.bloodshura.x.venus.function.annotation.MethodName;
import com.github.bloodshura.x.venus.value.StringValue;
import com.github.bloodshura.x.venus.value.Value;

@MethodArgs({ StringValue.class, Value.class })
@MethodName("getEnvVar")
public class GetEnvVar extends Method {
	@Override
	public Value call(Context context, FunctionCallDescriptor descriptor) throws ScriptRuntimeException {
		StringValue key = (StringValue) descriptor.get(0);
		Object value = XSystem.getEnvironmentVariable(key.value());
		Value result = Value.construct(value);

		return result != null ? result : descriptor.get(1);
	}
}