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A comprehensive framework for caching and displaying data.

There is a newer version: 1.1.3

/* 
 * Copyright (C) 2014 Pivotal Software, Inc. 
 * 
 * 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 io.pivotal.arca.utils;

import java.util.Collection;

public class StringUtils {

	public static boolean isEmpty(final String input) {
		return input == null || input.length() <= 0;
	}

	public static boolean isNotEmpty(final String input) {
		return !isEmpty(input);
	}

	public static String left(final String s, final int n) {
		if (s != null && n >= 0) {
			return s.substring(0, Math.min(s.length(), n));
		} else {
			return "";
		}
	}

	public static String right(final String s, final int n) {
		if (s != null && n >= 0) {
			final int length = s.length();
			return s.substring(length - Math.min(length, n), length);
		} else {
			return "";
		}
	}

	public static String append(final String string, final String append, final String delimeter) {
		if (string == null) {
			return append;
		} else {
			final StringBuilder builder = new StringBuilder(string);
			if (delimeter != null)
				builder.append(delimeter);
			if (append != null)
				builder.append(append);
			return builder.toString();
		}
	}

	public static  String join(final Collection s, final String delimiter) {
		if (s == null)
			return "";

		final StringBuffer buffer = new StringBuffer();
		for (final T t : s) {
			if (buffer.length() > 0 && delimiter != null) {
				buffer.append(delimiter);
			}
			buffer.append(t.toString());
		}
		return buffer.toString();
	}

	public static  String join(final T[] s, final String delimiter) {
		if (s == null)
			return "";

		final StringBuffer buffer = new StringBuffer();
		for (final T t : s) {
			if (buffer.length() > 0 && delimiter != null) {
				buffer.append(delimiter);
			}
			buffer.append(t.toString());
		}
		return buffer.toString();
	}

}