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StringCharBuffer.java
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128 lines (106 loc) · 3.07 KB
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/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
package java.nio;
// ## If the sequence is a string, use reflection to share its array
class StringCharBuffer // package-private
extends CharBuffer
{
CharSequence str;
StringCharBuffer(CharSequence s, int start, int end) { // package-private
super(-1, start, end, s.length());
int n = s.length();
if ((start < 0) || (start > n) || (end < start) || (end > n))
throw new IndexOutOfBoundsException();
str = s;
}
public CharBuffer slice() {
return new StringCharBuffer(str,
-1,
0,
this.remaining(),
this.remaining(),
offset + this.position());
}
private StringCharBuffer(CharSequence s,
int mark,
int pos,
int limit,
int cap,
int offset) {
super(mark, pos, limit, cap, null, offset);
str = s;
}
public CharBuffer duplicate() {
return new StringCharBuffer(str, markValue(),
position(), limit(), capacity(), offset);
}
public CharBuffer asReadOnlyBuffer() {
return duplicate();
}
public final char get() {
return str.charAt(nextGetIndex() + offset);
}
public final char get(int index) {
return str.charAt(checkIndex(index) + offset);
}
char getUnchecked(int index) {
return str.charAt(index + offset);
}
// ## Override bulk get methods for better performance
public final CharBuffer put(char c) {
throw new ReadOnlyBufferException();
}
public final CharBuffer put(int index, char c) {
throw new ReadOnlyBufferException();
}
public final CharBuffer compact() {
throw new ReadOnlyBufferException();
}
public final boolean isReadOnly() {
return true;
}
final String toString(int start, int end) {
return str.toString().substring(start + offset, end + offset);
}
public final CharBuffer subSequence(int start, int end) {
try {
int pos = position();
return new StringCharBuffer(str,
-1,
pos + checkIndex(start, pos),
pos + checkIndex(end, pos),
capacity(),
offset);
} catch (IllegalArgumentException x) {
throw new IndexOutOfBoundsException();
}
}
public boolean isDirect() {
return false;
}
public ByteOrder order() {
return ByteOrder.nativeOrder();
}
}