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The Enterprise Security API (ESAPI) project is an OWASP project to create simple strong security controls for every web platform. Security controls are not simple to build. You can read about the hundreds of pitfalls for unwary developers on the OWASP website. By providing developers with a set of strong controls, we aim to eliminate some of the complexity of creating secure web applications. This can result in significant cost savings across the SDLC.

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/**
 * OWASP Enterprise Security API (ESAPI)
 * 
 * This file is part of the Open Web Application Security Project (OWASP)
 * Enterprise Security API (ESAPI) project. For details, please see
 * http://www.owasp.org/index.php/ESAPI.
 *
 * Copyright (c) 2017 - The OWASP Foundation
 * 
 * The ESAPI is published by OWASP under the BSD license. You should read and accept the
 * LICENSE before you use, modify, and/or redistribute this software.
 * 
 * @author Matt Seil (mseil .at. owasp.org)
 * @created 2017
 * 
 * @author Jeff Williams (jeff.williams .at. aspectsecurity.com) Aspect Security
 * @created 2007
 */
package org.owasp.esapi.codecs;

/**
 * This class is intended to be an alternative Abstract Implementation for parsing encoding
 * data by focusing on {@code int} as opposed to {@code Character}.  Because non-BMP code
 * points cannot be represented by a {@code char}, this class remedies that by parsing string
 * data as codePoints as opposed to a stream of {@code char}s.
 * 
 * @author Matt Seil (mseil .at. owasp.org)
 * @since 2017 -- Adapted from Jeff Williams' original {@code Codec} class.  
 */
public class AbstractIntegerCodec extends AbstractCodec {

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String decode(String input) {
		StringBuilder sb = new StringBuilder();
		PushbackSequence pbs = new PushBackSequenceImpl(input);
		while (pbs.hasNext()) {
			Integer c = decodeCharacter(pbs);
			if (c != null && Character.isValidCodePoint(c)) {
				sb.appendCodePoint(c);
			} else {
				sb.appendCodePoint(pbs.next());
			}
		}
		return sb.toString();
	}
}