org.noggit.CharArr Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.noggit;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.nio.CharBuffer;
// CharArr origins
// V1.0 7/06/97
// V1.1 9/21/99
// V1.2 2/02/04 // Java5 features
// V1.3 11/26/06 // Make safe for Java 1.4, work into Noggit
// @author yonik
// Java5 version could look like the following:
// public class CharArr implements CharSequence, Appendable, Readable, Closeable {
/**
* @author yonik
* @version $Id: CharArr.java 583538 2007-10-10 16:53:02Z yonik $
*/
public class CharArr implements CharSequence, Appendable {
protected char[] buf;
protected int start;
protected int end;
public CharArr() {
this(32);
}
public CharArr(int size) {
buf = new char[size];
}
public CharArr(char[] arr, int start, int end) {
set(arr,start,end);
}
public void setStart(int start) { this.start = start; }
public void setEnd(int end) { this.end = end; }
public void set(char[] arr, int start, int end) {
this.buf = arr;
this.start = start;
this.end = end;
}
public char[] getArray() { return buf; }
public int getStart() { return start; }
public int getEnd() { return end; }
public int size() { return end-start; }
@Override
public int length() { return size(); }
public int capacity() { return buf.length; }
@Override
public char charAt(int index) {
return buf[start+index];
}
@Override
public CharArr subSequence(int start, int end) {
return new CharArr(buf, this.start+start, this.start+end);
}
public int read() throws IOException {
if (start>=end) return -1;
return buf[start++];
}
public int read(char cbuf[], int off, int len) {
//TODO
return 0;
}
public void unsafeWrite(char b) {
buf[end++] = b;
}
public void unsafeWrite(int b) { unsafeWrite((char)b); }
public void unsafeWrite(char b[], int off, int len) {
System.arraycopy(b, off, buf, end, len);
end += len;
}
protected void resize(int len) {
char newbuf[] = new char[Math.max(buf.length << 1, len)];
System.arraycopy(buf, start, newbuf, 0, size());
buf = newbuf;
}
public void reserve(int num) {
if (end + num > buf.length) resize(end + num);
}
public void write(char b) {
if (end >= buf.length) {
resize(end+1);
}
unsafeWrite(b);
}
public final void write(int b) { write((char)b); }
public final void write(char[] b) {
write(b,0,b.length);
}
public void write(char b[], int off, int len) {
reserve(len);
unsafeWrite(b, off, len);
}
public final void write(CharArr arr) {
write(arr.buf, start, end-start);
}
public final void write(String s) {
write(s, 0, s.length());
}
public void write(String s, int stringOffset, int len) {
reserve(len);
s.getChars(stringOffset, len, buf, end);
end += len;
}
public void flush() {
}
public final void reset() {
start = end = 0;
}
public void close() {
}
public char[] toCharArray() {
char newbuf[] = new char[size()];
System.arraycopy(buf, start, newbuf, 0, size());
return newbuf;
}
@Override
public String toString() {
return new String(buf, start, size());
}
public int read(CharBuffer cb) throws IOException {
/***
int sz = size();
if (sz<=0) return -1;
if (sz>0) cb.put(buf, start, sz);
return -1;
***/
int sz = size();
if (sz>0) cb.put(buf, start, sz);
start=end;
while (true) {
fill();
int s = size();
if (s==0) return sz==0 ? -1 : sz;
sz += s;
cb.put(buf, start, s);
}
}
public int fill() throws IOException {
return 0; // or -1?
}
//////////////// Appendable methods /////////////
@Override
public final Appendable append(CharSequence csq) throws IOException {
return append(csq, 0, csq.length());
}
@Override
public Appendable append(CharSequence csq, int start, int end) throws IOException {
write(csq.subSequence(start, end).toString());
return null;
}
@Override
public final Appendable append(char c) throws IOException {
write(c);
return this;
}
}
class NullCharArr extends CharArr {
public NullCharArr() {
super(new char[1],0,0);
}
@Override
public void unsafeWrite(char b) {}
@Override
public void unsafeWrite(char b[], int off, int len) {}
@Override
public void unsafeWrite(int b) {}
@Override
public void write(char b) {}
@Override
public void write(char b[], int off, int len) {}
@Override
public void reserve(int num) {}
@Override
protected void resize(int len) {}
@Override
public Appendable append(CharSequence csq, int start, int end) throws IOException {
return this;
}
@Override
public char charAt(int index) {
return 0;
}
@Override
public void write(String s, int stringOffset, int len) {
}
}
// IDEA: a subclass that refills the array from a reader?
class CharArrReader extends CharArr {
protected final Reader in;
public CharArrReader(Reader in, int size) {
super(size);
this.in = in;
}
@Override
public int read() throws IOException {
if (start>=end) fill();
return start>=end ? -1 : buf[start++];
}
@Override
public int read(CharBuffer cb) throws IOException {
// empty the buffer and then read direct
int sz = size();
if (sz>0) cb.put(buf,start,end);
int sz2 = in.read(cb);
if (sz2>=0) return sz+sz2;
return sz>0 ? sz : -1;
}
@Override
public int fill() throws IOException {
if (start>=end) {
reset();
} else if (start>0) {
System.arraycopy(buf, start, buf, 0, size());
end=size(); start=0;
}
/***
// fill fully or not???
do {
int sz = in.read(buf,end,buf.length-end);
if (sz==-1) return;
end+=sz;
} while (end < buf.length);
***/
int sz = in.read(buf,end,buf.length-end);
if (sz>0) end+=sz;
return sz;
}
}
class CharArrWriter extends CharArr {
protected Writer sink;
@Override
public void flush() {
try {
sink.write(buf, start, end-start);
} catch (IOException e) {
throw new RuntimeException(e);
}
start = end = 0;
}
@Override
public void write(char b) {
if (end >= buf.length) {
flush();
}
unsafeWrite(b);
}
@Override
public void write(char b[], int off, int len) {
int space = buf.length - end;
if (len < space) {
unsafeWrite(b, off, len);
} else if (len < buf.length) {
unsafeWrite(b, off, space);
flush();
unsafeWrite(b, off+space, len-space);
} else {
flush();
try {
sink.write(b, off, len);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
@Override
public void write(String s, int stringOffset, int len) {
int space = buf.length - end;
if (len < space) {
s.getChars(stringOffset, stringOffset+len, buf, end);
end += len;
} else if (len < buf.length) {
// if the data to write is small enough, buffer it.
s.getChars(stringOffset, stringOffset+space, buf, end);
flush();
s.getChars(stringOffset+space, stringOffset+len, buf, 0);
end = len-space;
} else {
flush();
// don't buffer, just write to sink
try {
sink.write(s, stringOffset, len);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
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