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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.plugins.pipelineprocessor.parser;

import org.graylog.plugins.pipelineprocessor.ast.functions.Function;

import javax.inject.Inject;
import java.util.Collection;
import java.util.Map;
import java.util.stream.Collectors;

public class FunctionRegistry {

    private final Map> functions;

    @Inject
    public FunctionRegistry(Map> functions) {
        this.functions = functions;
    }


    public Function resolve(String name) {
        return functions.get(name);
    }

    public Function resolveOrError(String name) {
        final Function function = resolve(name);
        if (function == null) {
            return Function.ERROR_FUNCTION;
        }
        return function;
    }

    public Collection> all() {
        return functions.values().stream().collect(Collectors.toList());
    }

}