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Simply utility methods used across other Molindo projects

There is a newer version: 3.0.0

/**
 * Copyright 2010 Molindo GmbH
 *
 * 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 at.molindo.utils.data;

public class FunctionUtils {

	private FunctionUtils() {
	}

	@SuppressWarnings("unchecked")
	public static  Function toStringFunction() {
		return (Function) ToString.INSTANCE;
	}

	public static Function toUpperCaseFunction() {
		return ToUpperCase.INSTANCE;
	}

	public static Function toLowerCaseFunction() {
		return ToLowerCase.INSTANCE;
	}

	public static Function trimFunction() {
		return Trim.INSTANCE;
	}

	public static Function parseIntFunction() {
		return ParseInt.INSTANCE;
	}

	public static  Function chain(final Function first, final Function second) {
		return new Function() {

			@Override
			public T apply(F input) {
				return second.apply(first.apply(input));
			}

		};
	}

	public static  Function value(final T value) {
		return new Function() {

			@Override
			public T apply(F input) {
				return value;
			}

		};
	}

	// enum singleton
	public enum ToString implements Function {
		INSTANCE;

		@Override
		public String apply(Object input) {
			return StringUtils.string(input);
		}

	}

	public enum ToLowerCase implements Function {
		INSTANCE;

		@Override
		public String apply(String input) {
			return StringUtils.lower(input);
		}

	}

	public enum ToUpperCase implements Function {
		INSTANCE;

		@Override
		public String apply(String input) {
			return StringUtils.upper(input);
		}

	}

	public enum Trim implements Function {
		INSTANCE;

		@Override
		public String apply(String input) {
			return StringUtils.trim(input);
		}

	}

	public enum ParseInt implements Function {
		INSTANCE;

		@Override
		public Integer apply(String input) {
			return Integer.parseInt(input);
		}

	}

}