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univocity's open source parsers for processing different text formats using a consistent API
/*******************************************************************************
* 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.
*
* @author Univocity Software Pty Ltd - [email protected]
* @see com.univocity.parsers.common.ParserOutput
* @see com.univocity.parsers.common.input.CharAppender
*/
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 -1 as this appender does nothing.
*
* @return -1 as this appender does nothing.
*/
@Override
public int length() {
return -1;
}
/**
* 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) {
}
/**
* 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() {
}
/**
* Does nothing
*/
@Override
public char[] getChars() {
return null;
}
/**
* Does nothing
*/
@Override
public void fill(char ch, int length) {
}
/**
* Does nothing
*/
@Override
public void appendIgnoringPadding(char ch, char padding) {
}
/**
* Does nothing
*/
@Override
public void appendIgnoringWhitespaceAndPadding(char ch, char padding) {
}
/**
* Does nothing
*/
@Override
public void prepend(char ch) {
}
/**
* Does nothing
*/
@Override
public void updateWhitespace() {
}
@Override
public char appendUntil(char ch, CharInput input, char stop) {
for (; ch != stop; ch = input.nextChar()) ;
return ch;
}
@Override
public final char appendUntil(char ch, CharInput input, char stop1, char stop2) {
for (; ch != stop1 && ch != stop2; ch = input.nextChar()) ;
return ch;
}
@Override
public final char appendUntil(char ch, CharInput input, char stop1, char stop2, char stop3) {
for (; ch != stop1 && ch != stop2 && ch != stop3; ch = input.nextChar())
;
return ch;
}
/**
* Does nothing
*/
@Override
public void append(char[] ch, int from, int length) {
}
/**
* Does nothing
*/
@Override
public void prepend(char ch1, char ch2) {
}
/**
* Does nothing
*/
@Override
public void prepend(char[] chars) {
}
/**
* Does nothing
*/
@Override
public void append(char[] ch) {
}
/**
* Does nothing
*/
@Override
public void append(String string) {
}
/**
* Does nothing
*/
@Override
public void append(String string, int from, int to) {
}
/**
* Does nothing
*/
@Override
public char charAt(int i) {
return 0;
}
/**
* Does nothing
*/
@Override
public CharSequence subSequence(int i, int i1) {
return null;
}
/**
* Does nothing
*/
@Override
public void append(int ch) {
}
/**
* Does nothing
*/
@Override
public void append(int[] ch) {
}
/**
* Does nothing
*/
@Override
public void append(Object obj) {
}
/**
* Does nothing
*/
@Override
public void ignore(int count) {
}
/**
* Does nothing
*/
@Override
public int indexOf(char ch, int from) {
return -1;
}
/**
* Does nothing
*/
@Override
public String substring(int from, int length) {
return null;
}
/**
* Does nothing
*/
@Override
public void remove(int from, int length) {
}
/**
* Does nothing
*/
@Override
public void delete(int count) {
}
/**
* Does nothing
*/
@Override
public int indexOfAny(char[] chars, int from) {
return -1;
}
/**
* Does nothing
*/
@Override
public int indexOf(char[] charSequence, int from) {
return -1;
}
/**
* Does nothing
*/
@Override
public int indexOf(CharSequence charSequence, int from) {
return -1;
}
/**
* Returns {@code true} as it's always empty.
*/
@Override
public boolean isEmpty() {
return true;
}
@Override
public int lastIndexOf(char ch) {
return -1;
}
}