/*
* Copyright 2000-2015 JetBrains s.r.o.
*
* 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.intellij.util.text;
import com.intellij.openapi.util.text.CharSequenceWithStringHash;
import com.intellij.openapi.util.text.StringUtil;
import org.jetbrains.annotations.NotNull;
public class ByteArrayCharSequence implements CharSequenceWithStringHash {
private int hash;
private final byte[] myChars;
private ByteArrayCharSequence(@NotNull byte[] chars) {
myChars = chars;
}
@Override
public int hashCode() {
int h = hash;
if (h == 0) {
hash = h = StringUtil.stringHashCode(this, 0, length());
}
return h;
}
@Override
public final int length() {
return myChars.length;
}
@Override
public final char charAt(int index) {
return (char)myChars[index];
}
@NotNull
@Override
public CharSequence subSequence(int start, int end) {
return start == 0 && end == length() ? this : new CharSequenceSubSequence(this, start, end);
}
@Override
@NotNull
public String toString() {
return StringFactory.createShared(CharArrayUtil.fromSequence(this, 0, length()));
}
@NotNull
public static CharSequence convertToBytesIfAsciiString(@NotNull String name) {
return convertToBytesIfAsciiString((CharSequence)name);
}
@NotNull
public static CharSequence convertToBytesIfAsciiString(@NotNull CharSequence name) {
int length = name.length();
if (length == 0) return "";
byte[] bytes = new byte[length];
for (int i = 0; i < length; i++) {
char c = name.charAt(i);
if (c >= 128) {
//noinspection RedundantStringConstructorCall
return new String(name.toString()); // So we don't hold whole char[] buffer of a lengthy path on JDK 6
}
bytes[i] = (byte)c;
}
return new ByteArrayCharSequence(bytes);
}
}