org.ojalgo.netio.CharacterRing Maven / Gradle / Ivy
/*
* Copyright 1997-2022 Optimatika
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.ojalgo.netio;
import java.io.IOException;
import java.io.Writer;
import java.nio.CharBuffer;
import java.util.Arrays;
import java.util.Formatter;
import java.util.Locale;
import java.util.Optional;
/**
* A circular char buffer - an {@linkplain Appendable} {@linkplain CharSequence} that always hold exactly
* 65536 characters. Whenever you append something the oldest entry gets overwritten.
*
* @author apete
*/
public final class CharacterRing implements CharSequence, Appendable, BasicLogger.Buffer {
public static final class RingLogger implements BasicLogger, BasicLogger.Buffer {
private transient Formatter myFormatter;
private final CharacterRing myRing;
RingLogger() {
super();
myRing = new CharacterRing();
}
public Optional asWriter() {
return Optional.empty();
}
public void clear() {
myRing.clear();
}
public void flush(final Appendable receiver) {
myRing.flush(receiver);
}
public void flush(final BasicLogger receiver) {
myRing.flush(receiver);
}
public void print(final boolean value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final byte value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final char value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final double value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final float value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final int value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final long value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final Object object) {
try {
myRing.append(String.valueOf(object));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final short value) {
try {
myRing.append(String.valueOf(value));
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void print(final Throwable throwable) {
throwable.printStackTrace();
}
public void printf(final String format, final Object... args) {
if (myFormatter == null || myFormatter.locale() != Locale.getDefault()) {
myFormatter = new Formatter(myRing);
}
myFormatter.format(Locale.getDefault(), format, args);
}
public void println() {
try {
myRing.append(ASCII.LF);
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
}
public static int length = Character.MAX_VALUE + 1;
public static RingLogger newRingLogger() {
return new RingLogger();
}
private final char[] myCharacters;
private char myCursor = 0;
public CharacterRing() {
super();
myCharacters = new char[length];
myCursor = 0;
}
@Override
public CharacterRing append(final char c) throws IOException {
myCharacters[myCursor++] = c;
return this;
}
@Override
public CharacterRing append(final CharSequence csq) throws IOException {
return this.append(csq, 0, csq.length());
}
@Override
public CharacterRing append(final CharSequence csq, final int start, final int end) throws IOException {
for (int i = start; i < end; i++) {
this.append(csq.charAt(i));
}
return this;
}
@Override
public char charAt(final int index) {
return myCharacters[(myCursor + index) % length];
}
public void clear() {
Arrays.fill(myCharacters, ASCII.NULL);
myCursor = 0;
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if ((obj == null) || !(obj instanceof CharacterRing)) {
return false;
}
CharacterRing other = (CharacterRing) obj;
if (!Arrays.equals(myCharacters, other.myCharacters) || (myCursor != other.myCursor)) {
return false;
}
return true;
}
public void flush(final Appendable receiver) {
try {
synchronized (receiver) {
int cursor = myCursor;
char tmpChar;
for (int i = cursor; i < length; i++) {
tmpChar = myCharacters[i];
if (tmpChar != ASCII.NULL) {
receiver.append(tmpChar);
}
}
for (int i = 0; i < cursor; i++) {
tmpChar = myCharacters[i];
if (tmpChar != ASCII.NULL) {
receiver.append(tmpChar);
}
}
this.clear();
}
} catch (IOException cause) {
throw new RuntimeException(cause);
}
}
public void flush(final BasicLogger receiver) {
synchronized (receiver) {
int cursor = myCursor;
char tmpChar;
for (int i = cursor; i < length; i++) {
tmpChar = myCharacters[i];
if (tmpChar != ASCII.NULL) {
receiver.print(tmpChar);
}
}
for (int i = 0; i < cursor; i++) {
tmpChar = myCharacters[i];
if (tmpChar != ASCII.NULL) {
receiver.print(tmpChar);
}
}
this.clear();
}
}
@Override
public int hashCode() {
int prime = 31;
int result = 1;
result = (prime * result) + Arrays.hashCode(myCharacters);
return (prime * result) + myCursor;
}
public int indexOfFirst(final char c) {
int retVal = -1;
char cursor = myCursor;
for (int i = cursor; (retVal < 0) && (i < length); i++) {
if (myCharacters[i] == c) {
retVal = i - cursor;
}
}
for (int i = 0; (retVal < 0) && (i < cursor); i++) {
if (myCharacters[i] == c) {
retVal = i + cursor;
}
}
return retVal;
}
public int indexOfLast(final char c) {
int retVal = -1;
char cursor = myCursor;
for (int i = cursor - 1; (retVal < 0) && (i >= 0); i--) {
if (myCharacters[i] == c) {
retVal = i + cursor;
}
}
for (int i = length - 1; (retVal < 0) && (i >= cursor); i--) {
if (myCharacters[i] == c) {
retVal = i - cursor;
}
}
return retVal;
}
@Override
public int length() {
return length;
}
@Override
public CharSequence subSequence(final int start, final int end) {
return CharBuffer.wrap(this, start, end);
}
@Override
public String toString() {
char cursor = myCursor;
String firstPart = String.valueOf(myCharacters, cursor, length - cursor);
String secondPart = String.valueOf(myCharacters, 0, cursor);
return firstPart + secondPart;
}
char getCursor() {
return myCursor;
}
}
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