com.linkedin.pinot.core.data.function.FunctionRegistry.java Source code

Introduction

Here is the source code for com.linkedin.pinot.core.data.function.FunctionRegistry.java

Source

/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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 com.linkedin.pinot.core.data.function;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.common.base.Preconditions;

public class FunctionRegistry {

    static Map<String, List<FunctionInfo>> _functionInfoMap = new HashMap<>();

    public static FunctionInfo resolve(String functionName, Class<?>[] argumentTypes) {
        List<FunctionInfo> list = _functionInfoMap.get(functionName.toLowerCase());
        FunctionInfo bestMatch = null;
        if (list != null && list.size() > 0) {
            for (FunctionInfo functionInfo : list) {
                if (functionInfo.isApplicable(argumentTypes)) {
                    bestMatch = functionInfo;
                    break;
                }
            }
        }
        return bestMatch;
    }

    public static void registerStaticFunction(Method method) {
        Preconditions.checkArgument(Modifier.isStatic(method.getModifiers()),
                "Method needs to be static:" + method);
        List<FunctionInfo> list = new ArrayList<>();
        FunctionInfo functionInfo = new FunctionInfo(method, method.getDeclaringClass());
        list.add(functionInfo);
        _functionInfoMap.put(method.getName().toLowerCase(), list);
    }
}