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/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  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());
    }
}