UserDefinedScalarFunctions.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.table.api.java.utils;

import java.util.Arrays;
import org.apache.flink.table.functions.ScalarFunction;

public class UserDefinedScalarFunctions {

	public static class JavaFunc0 extends ScalarFunction {
		public long eval(Long l) {
			return l + 1;
		}
	}

	public static class JavaFunc1 extends ScalarFunction {
		public String eval(Integer a, int b,  Long c) {
			return a + " and " + b + " and " + c;
		}
	}

	public static class JavaFunc2 extends ScalarFunction {
		public String eval(String s, Integer... a) {
			int m = 1;
			for (int n : a) {
				m *= n;
			}
			return s + m;
		}
	}

	public static class JavaFunc3 extends ScalarFunction {
		public int eval(String a, int... b) {
			return b.length;
		}

		public String eval(String c) {
			return c;
		}
	}

	public static class JavaFunc4 extends ScalarFunction {
		public String eval(Integer[] a, String[] b) {
			return Arrays.toString(a) + " and " + Arrays.toString(b);
		}
	}

}