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univocity's open source parsers for processing different text formats using a consistent API

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/*******************************************************************************
 * Copyright 2014 uniVocity Software Pty Ltd
 *
 * 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.univocity.parsers.common.input;

import com.univocity.parsers.common.*;

/**
 * An implementation of {@link CharAppender} that does nothing. Used by {@link ParserOutput} to transparently discard any unwanted input while parsing.
 *
 * @see com.univocity.parsers.common.ParserOutput
 * @see com.univocity.parsers.common.input.CharAppender
 *
 * @author uniVocity Software Pty Ltd - [email protected]
 *
 */
public class NoopCharAppender implements CharAppender {

	private static final NoopCharAppender instance = new NoopCharAppender();

	/**
	 * Returns the singleton instance of NoopCharAppender
	 * @return the singleton instance of NoopCharAppender
	 */
	public static CharAppender getInstance() {
		return instance;
	}

	/**
	 * This is a singleton class and cannot be instantiated. Use {@link NoopCharAppender#getInstance()}.
	 */
	private NoopCharAppender() {

	}

	/**
	 * Returns 0 as this appender does nothing.
	 * @return 0 as this appender does nothing.
	 */
	@Override
	public int length() {
		return 0;
	}

	/**
	 * Returns null as this appender does nothing.
	 * @return null as this appender does nothing.
	 */
	@Override
	public String getAndReset() {
		return null;
	}

	/**
	 * Does nothing
	 */
	@Override
	public void appendIgnoringWhitespace(char ch) {
	}

	/**
	 * Does nothing
	 */
	@Override
	public void append(char ch) {
	}

	/**
	 * Does nothing
	 */
	@Override
	public void appendIgnoringPadding(char ch) {
	}

	/**
	 * Does nothing
	 */
	@Override
	public void appendIgnoringWhitespaceAndPadding(char ch) {
	}

	/**
	 * Returns null as this appender does nothing.
	 * @return null as this appender does nothing.
	 */
	@Override
	public char[] getCharsAndReset() {
		return null;
	}

	/**
	 * Returns 0 as this appender does nothing.
	 * @return 0 as this appender does nothing.
	 */
	@Override
	public int whitespaceCount() {
		return 0;
	}

	/**
	 * Does nothing
	 */
	@Override
	public void reset() {
	}

	/**
	 * Does nothing
	 */
	@Override
	public void resetWhitespaceCount() {

	}

}