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/*
* 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 java.lang;
import java.io.InvalidObjectException;
import java.util.Arrays;
import libcore.util.EmptyArray;
/**
* A modifiable {@link CharSequence sequence of characters} for use in creating
* and modifying Strings. This class is intended as a base class for
* {@link StringBuffer} and {@link StringBuilder}.
*
* @see StringBuffer
* @see StringBuilder
* @since 1.5
*/
abstract class AbstractStringBuilder {
static final int INITIAL_CAPACITY = 16;
private char[] value;
private int count;
private boolean shared;
/*
* Returns the character array.
*/
final char[] getValue() {
return value;
}
/*
* Returns the underlying buffer and sets the shared flag.
*/
final char[] shareValue() {
shared = true;
return value;
}
/*
* Restores internal state after deserialization.
*/
final void set(char[] val, int len) throws InvalidObjectException {
if (val == null) {
val = EmptyArray.CHAR;
}
if (val.length < len) {
throw new InvalidObjectException("count out of range");
}
shared = false;
value = val;
count = len;
}
AbstractStringBuilder() {
value = new char[INITIAL_CAPACITY];
}
AbstractStringBuilder(int capacity) {
if (capacity < 0) {
throw new NegativeArraySizeException(Integer.toString(capacity));
}
value = new char[capacity];
}
AbstractStringBuilder(String string) {
count = string.length();
shared = false;
value = new char[count + INITIAL_CAPACITY];
string._getChars(0, count, value, 0);
}
private void enlargeBuffer(int min) {
int newCount = ((value.length >> 1) + value.length) + 2;
char[] newData = new char[min > newCount ? min : newCount];
System.arraycopy(value, 0, newData, 0, count);
value = newData;
shared = false;
}
final void appendNull() {
int newCount = count + 4;
if (newCount > value.length) {
enlargeBuffer(newCount);
}
value[count++] = 'n';
value[count++] = 'u';
value[count++] = 'l';
value[count++] = 'l';
}
final void append0(char[] chars) {
int newCount = count + chars.length;
if (newCount > value.length) {
enlargeBuffer(newCount);
}
System.arraycopy(chars, 0, value, count, chars.length);
count = newCount;
}
final void append0(char[] chars, int offset, int length) {
Arrays.checkOffsetAndCount(chars.length, offset, length);
int newCount = count + length;
if (newCount > value.length) {
enlargeBuffer(newCount);
}
System.arraycopy(chars, offset, value, count, length);
count = newCount;
}
final void append0(char ch) {
if (count == value.length) {
enlargeBuffer(count + 1);
}
value[count++] = ch;
}
final void append0(String string) {
if (string == null) {
appendNull();
return;
}
int length = string.length();
int newCount = count + length;
if (newCount > value.length) {
enlargeBuffer(newCount);
}
string._getChars(0, length, value, count);
count = newCount;
}
final void append0(CharSequence s, int start, int end) {
if (s == null) {
s = "null";
}
if ((start | end) < 0 || start > end || end > s.length()) {
throw new IndexOutOfBoundsException();
}
int length = end - start;
int newCount = count + length;
if (newCount > value.length) {
enlargeBuffer(newCount);
} else if (shared) {
value = value.clone();
shared = false;
}
if (s instanceof String) {
((String) s)._getChars(start, end, value, count);
} else if (s instanceof AbstractStringBuilder) {
AbstractStringBuilder other = (AbstractStringBuilder) s;
System.arraycopy(other.value, start, value, count, length);
} else {
int j = count; // Destination index.
for (int i = start; i < end; i++) {
value[j++] = s.charAt(i);
}
}
this.count = newCount;
}
/**
* Returns the number of characters that can be held without growing.
*
* @return the capacity
* @see #ensureCapacity
* @see #length
*/
public int capacity() {
return value.length;
}
/**
* Retrieves the character at the {@code index}.
*
* @param index
* the index of the character to retrieve.
* @return the char value.
* @throws IndexOutOfBoundsException
* if {@code index} is negative or greater than or equal to the
* current {@link #length()}.
*/
public char charAt(int index) {
if (index < 0 || index >= count) {
throw indexAndLength(index);
}
return value[index];
}
private StringIndexOutOfBoundsException indexAndLength(int index) {
throw new StringIndexOutOfBoundsException(count, index);
}
private StringIndexOutOfBoundsException startEndAndLength(int start, int end) {
throw new StringIndexOutOfBoundsException(count, start, end - start);
}
final void delete0(int start, int end) {
if (start >= 0) {
if (end > count) {
end = count;
}
if (end == start) {
return;
}
if (end > start) {
int length = count - end;
if (length >= 0) {
if (!shared) {
System.arraycopy(value, end, value, start, length);
} else {
char[] newData = new char[value.length];
System.arraycopy(value, 0, newData, 0, start);
System.arraycopy(value, end, newData, start, length);
value = newData;
shared = false;
}
}
count -= end - start;
return;
}
}
throw startEndAndLength(start, end);
}
final void deleteCharAt0(int index) {
if (index < 0 || index >= count) {
throw indexAndLength(index);
}
int length = count - index - 1;
if (length > 0) {
if (!shared) {
System.arraycopy(value, index + 1, value, index, length);
} else {
char[] newData = new char[value.length];
System.arraycopy(value, 0, newData, 0, index);
System.arraycopy(value, index + 1, newData, index, length);
value = newData;
shared = false;
}
}
count--;
}
/**
* Ensures that this object has a minimum capacity available before
* requiring the internal buffer to be enlarged. The general policy of this
* method is that if the {@code minimumCapacity} is larger than the current
* {@link #capacity()}, then the capacity will be increased to the largest
* value of either the {@code minimumCapacity} or the current capacity
* multiplied by two plus two. Although this is the general policy, there is
* no guarantee that the capacity will change.
*
* @param min
* the new minimum capacity to set.
*/
public void ensureCapacity(int min) {
if (min > value.length) {
int ourMin = value.length*2 + 2;
enlargeBuffer(Math.max(ourMin, min));
}
}
/**
* Copies the requested sequence of characters into {@code dst} passed
* starting at {@code dst}.
*
* @param start
* the inclusive start index of the characters to copy.
* @param end
* the exclusive end index of the characters to copy.
* @param dst
* the {@code char[]} to copy the characters to.
* @param dstStart
* the inclusive start index of {@code dst} to begin copying to.
* @throws IndexOutOfBoundsException
* if the {@code start} is negative, the {@code dstStart} is
* negative, the {@code start} is greater than {@code end}, the
* {@code end} is greater than the current {@link #length()} or
* {@code dstStart + end - begin} is greater than
* {@code dst.length}.
*/
public void getChars(int start, int end, char[] dst, int dstStart) {
if (start > count || end > count || start > end) {
throw startEndAndLength(start, end);
}
System.arraycopy(value, start, dst, dstStart, end - start);
}
final void insert0(int index, char[] chars) {
if (index < 0 || index > count) {
throw indexAndLength(index);
}
if (chars.length != 0) {
move(chars.length, index);
System.arraycopy(chars, 0, value, index, chars.length);
count += chars.length;
}
}
final void insert0(int index, char[] chars, int start, int length) {
if (index >= 0 && index <= count) {
// start + length could overflow, start/length maybe MaxInt
if (start >= 0 && length >= 0 && length <= chars.length - start) {
if (length != 0) {
move(length, index);
System.arraycopy(chars, start, value, index, length);
count += length;
}
return;
}
}
throw new StringIndexOutOfBoundsException("this.length=" + count
+ "; index=" + index + "; chars.length=" + chars.length
+ "; start=" + start + "; length=" + length);
}
final void insert0(int index, char ch) {
if (index < 0 || index > count) {
// RI compatible exception type
throw new ArrayIndexOutOfBoundsException(count, index);
}
move(1, index);
value[index] = ch;
count++;
}
final void insert0(int index, String string) {
if (index >= 0 && index <= count) {
if (string == null) {
string = "null";
}
int min = string.length();
if (min != 0) {
move(min, index);
string._getChars(0, min, value, index);
count += min;
}
} else {
throw indexAndLength(index);
}
}
final void insert0(int index, CharSequence s, int start, int end) {
if (s == null) {
s = "null";
}
if ((index | start | end) < 0 || index > count || start > end || end > s.length()) {
throw new IndexOutOfBoundsException();
}
insert0(index, s.subSequence(start, end).toString());
}
/**
* The current length.
*
* @return the number of characters contained in this instance.
*/
public int length() {
return count;
}
private void move(int size, int index) {
int newCount;
if (value.length - count >= size) {
if (!shared) {
// index == count case is no-op
System.arraycopy(value, index, value, index + size, count - index);
return;
}
newCount = value.length;
} else {
newCount = Math.max(count + size, value.length*2 + 2);
}
char[] newData = new char[newCount];
System.arraycopy(value, 0, newData, 0, index);
// index == count case is no-op
System.arraycopy(value, index, newData, index + size, count - index);
value = newData;
shared = false;
}
final void replace0(int start, int end, String string) {
if (start >= 0) {
if (end > count) {
end = count;
}
if (end > start) {
int stringLength = string.length();
int diff = end - start - stringLength;
if (diff > 0) { // replacing with fewer characters
if (!shared) {
// index == count case is no-op
System.arraycopy(value, end, value, start
+ stringLength, count - end);
} else {
char[] newData = new char[value.length];
System.arraycopy(value, 0, newData, 0, start);
// index == count case is no-op
System.arraycopy(value, end, newData, start
+ stringLength, count - end);
value = newData;
shared = false;
}
} else if (diff < 0) {
// replacing with more characters...need some room
move(-diff, end);
} else if (shared) {
value = value.clone();
shared = false;
}
string._getChars(0, stringLength, value, start);
count -= diff;
return;
}
if (start == end) {
if (string == null) {
throw new NullPointerException("string == null");
}
insert0(start, string);
return;
}
}
throw startEndAndLength(start, end);
}
final void reverse0() {
if (count < 2) {
return;
}
if (!shared) {
int end = count - 1;
char frontHigh = value[0];
char endLow = value[end];
boolean allowFrontSur = true, allowEndSur = true;
for (int i = 0, mid = count / 2; i < mid; i++, --end) {
char frontLow = value[i + 1];
char endHigh = value[end - 1];
boolean surAtFront = allowFrontSur && frontLow >= 0xdc00
&& frontLow <= 0xdfff && frontHigh >= 0xd800
&& frontHigh <= 0xdbff;
if (surAtFront && (count < 3)) {
return;
}
boolean surAtEnd = allowEndSur && endHigh >= 0xd800
&& endHigh <= 0xdbff && endLow >= 0xdc00
&& endLow <= 0xdfff;
allowFrontSur = allowEndSur = true;
if (surAtFront == surAtEnd) {
if (surAtFront) {
// both surrogates
value[end] = frontLow;
value[end - 1] = frontHigh;
value[i] = endHigh;
value[i + 1] = endLow;
frontHigh = value[i + 2];
endLow = value[end - 2];
i++;
end--;
} else {
// neither surrogates
value[end] = frontHigh;
value[i] = endLow;
frontHigh = frontLow;
endLow = endHigh;
}
} else {
if (surAtFront) {
// surrogate only at the front
value[end] = frontLow;
value[i] = endLow;
endLow = endHigh;
allowFrontSur = false;
} else {
// surrogate only at the end
value[end] = frontHigh;
value[i] = endHigh;
frontHigh = frontLow;
allowEndSur = false;
}
}
}
if ((count & 1) == 1 && (!allowFrontSur || !allowEndSur)) {
value[end] = allowFrontSur ? endLow : frontHigh;
}
} else {
char[] newData = new char[value.length];
for (int i = 0, end = count; i < count; i++) {
char high = value[i];
if ((i + 1) < count && high >= 0xd800 && high <= 0xdbff) {
char low = value[i + 1];
if (low >= 0xdc00 && low <= 0xdfff) {
newData[--end] = low;
i++;
}
}
newData[--end] = high;
}
value = newData;
shared = false;
}
}
/**
* Sets the character at the {@code index}.
*
* @param index
* the zero-based index of the character to replace.
* @param ch
* the character to set.
* @throws IndexOutOfBoundsException
* if {@code index} is negative or greater than or equal to the
* current {@link #length()}.
*/
public void setCharAt(int index, char ch) {
if (index < 0 || index >= count) {
throw indexAndLength(index);
}
if (shared) {
value = value.clone();
shared = false;
}
value[index] = ch;
}
/**
* Sets the current length to a new value. If the new length is larger than
* the current length, then the new characters at the end of this object
* will contain the {@code char} value of {@code \u0000}.
*
* @param length
* the new length of this StringBuffer.
* @exception IndexOutOfBoundsException
* if {@code length < 0}.
* @see #length
*/
public void setLength(int length) {
if (length < 0) {
throw new StringIndexOutOfBoundsException("length < 0: " + length);
}
if (length > value.length) {
enlargeBuffer(length);
} else {
if (shared) {
char[] newData = new char[value.length];
System.arraycopy(value, 0, newData, 0, count);
value = newData;
shared = false;
} else {
if (count < length) {
Arrays.fill(value, count, length, (char) 0);
}
}
}
count = length;
}
/**
* Returns the String value of the subsequence from the {@code start} index
* to the current end.
*
* @param start
* the inclusive start index to begin the subsequence.
* @return a String containing the subsequence.
* @throws StringIndexOutOfBoundsException
* if {@code start} is negative or greater than the current
* {@link #length()}.
*/
public String substring(int start) {
if (start >= 0 && start <= count) {
if (start == count) {
return "";
}
// Remove String sharing for more performance
return new String(value, start, count - start);
}
throw indexAndLength(start);
}
/**
* Returns the String value of the subsequence from the {@code start} index
* to the {@code end} index.
*
* @param start
* the inclusive start index to begin the subsequence.
* @param end
* the exclusive end index to end the subsequence.
* @return a String containing the subsequence.
* @throws StringIndexOutOfBoundsException
* if {@code start} is negative, greater than {@code end} or if
* {@code end} is greater than the current {@link #length()}.
*/
public String substring(int start, int end) {
if (start >= 0 && start <= end && end <= count) {
if (start == end) {
return "";
}
// Remove String sharing for more performance
return new String(value, start, end - start);
}
throw startEndAndLength(start, end);
}
/**
* Returns the current String representation.
*
* @return a String containing the characters in this instance.
*/
@Override
public String toString() {
if (count == 0) {
return "";
}
// Optimize String sharing for more performance
int wasted = value.length - count;
if (wasted >= 256
|| (wasted >= INITIAL_CAPACITY && wasted >= (count >> 1))) {
return new String(value, 0, count);
}
shared = true;
return new String(0, count, value);
}
/**
* Returns a {@code CharSequence} of the subsequence from the {@code start}
* index to the {@code end} index.
*
* @param start
* the inclusive start index to begin the subsequence.
* @param end
* the exclusive end index to end the subsequence.
* @return a CharSequence containing the subsequence.
* @throws IndexOutOfBoundsException
* if {@code start} is negative, greater than {@code end} or if
* {@code end} is greater than the current {@link #length()}.
* @since 1.4
*/
public CharSequence subSequence(int start, int end) {
return substring(start, end);
}
/**
* Searches for the first index of the specified character. The search for
* the character starts at the beginning and moves towards the end.
*
* @param string
* the string to find.
* @return the index of the specified character, -1 if the character isn't
* found.
* @see #lastIndexOf(String)
* @since 1.4
*/
public int indexOf(String string) {
return indexOf(string, 0);
}
/**
* Searches for the index of the specified character. The search for the
* character starts at the specified offset and moves towards the end.
*
* @param subString
* the string to find.
* @param start
* the starting offset.
* @return the index of the specified character, -1 if the character isn't
* found
* @see #lastIndexOf(String,int)
* @since 1.4
*/
public int indexOf(String subString, int start) {
if (start < 0) {
start = 0;
}
int subCount = subString.length();
if (subCount > 0) {
if (subCount + start > count) {
return -1;
}
// TODO optimize charAt to direct array access
char firstChar = subString.charAt(0);
while (true) {
int i = start;
boolean found = false;
for (; i < count; i++) {
if (value[i] == firstChar) {
found = true;
break;
}
}
if (!found || subCount + i > count) {
return -1; // handles subCount > count || start >= count
}
int o1 = i, o2 = 0;
while (++o2 < subCount && value[++o1] == subString.charAt(o2)) {
// Intentionally empty
}
if (o2 == subCount) {
return i;
}
start = i + 1;
}
}
return (start < count || start == 0) ? start : count;
}
/**
* Searches for the last index of the specified character. The search for
* the character starts at the end and moves towards the beginning.
*
* @param string
* the string to find.
* @return the index of the specified character, -1 if the character isn't
* found.
* @throws NullPointerException
* if {@code string} is {@code null}.
* @see String#lastIndexOf(java.lang.String)
* @since 1.4
*/
public int lastIndexOf(String string) {
return lastIndexOf(string, count);
}
/**
* Searches for the index of the specified character. The search for the
* character starts at the specified offset and moves towards the beginning.
*
* @param subString
* the string to find.
* @param start
* the starting offset.
* @return the index of the specified character, -1 if the character isn't
* found.
* @throws NullPointerException
* if {@code subString} is {@code null}.
* @see String#lastIndexOf(String,int)
* @since 1.4
*/
public int lastIndexOf(String subString, int start) {
int subCount = subString.length();
if (subCount <= count && start >= 0) {
if (subCount > 0) {
if (start > count - subCount) {
start = count - subCount; // count and subCount are both
}
// >= 1
// TODO optimize charAt to direct array access
char firstChar = subString.charAt(0);
while (true) {
int i = start;
boolean found = false;
for (; i >= 0; --i) {
if (value[i] == firstChar) {
found = true;
break;
}
}
if (!found) {
return -1;
}
int o1 = i, o2 = 0;
while (++o2 < subCount
&& value[++o1] == subString.charAt(o2)) {
// Intentionally empty
}
if (o2 == subCount) {
return i;
}
start = i - 1;
}
}
return start < count ? start : count;
}
return -1;
}
/**
* Trims off any extra capacity beyond the current length. Note, this method
* is NOT guaranteed to change the capacity of this object.
*
* @since 1.5
*/
public void trimToSize() {
if (count < value.length) {
char[] newValue = new char[count];
System.arraycopy(value, 0, newValue, 0, count);
value = newValue;
shared = false;
}
}
/**
* Retrieves the Unicode code point value at the {@code index}.
*
* @param index
* the index to the {@code char} code unit.
* @return the Unicode code point value.
* @throws IndexOutOfBoundsException
* if {@code index} is negative or greater than or equal to
* {@link #length()}.
* @see Character
* @see Character#codePointAt(char[], int, int)
* @since 1.5
*/
public int codePointAt(int index) {
if (index < 0 || index >= count) {
throw indexAndLength(index);
}
return Character.codePointAt(value, index, count);
}
/**
* Retrieves the Unicode code point value that precedes the {@code index}.
*
* @param index
* the index to the {@code char} code unit within this object.
* @return the Unicode code point value.
* @throws IndexOutOfBoundsException
* if {@code index} is less than 1 or greater than
* {@link #length()}.
* @see Character
* @see Character#codePointBefore(char[], int, int)
* @since 1.5
*/
public int codePointBefore(int index) {
if (index < 1 || index > count) {
throw indexAndLength(index);
}
return Character.codePointBefore(value, index);
}
/**
* Calculates the number of Unicode code points between {@code start}
* and {@code end}.
*
* @param start
* the inclusive beginning index of the subsequence.
* @param end
* the exclusive end index of the subsequence.
* @return the number of Unicode code points in the subsequence.
* @throws IndexOutOfBoundsException
* if {@code start} is negative or greater than
* {@code end} or {@code end} is greater than
* {@link #length()}.
* @see Character
* @see Character#codePointCount(char[], int, int)
* @since 1.5
*/
public int codePointCount(int start, int end) {
if (start < 0 || end > count || start > end) {
throw startEndAndLength(start, end);
}
return Character.codePointCount(value, start, end - start);
}
/**
* Returns the index that is offset {@code codePointOffset} code points from
* {@code index}.
*
* @param index
* the index to calculate the offset from.
* @param codePointOffset
* the number of code points to count.
* @return the index that is {@code codePointOffset} code points away from
* index.
* @throws IndexOutOfBoundsException
* if {@code index} is negative or greater than
* {@link #length()} or if there aren't enough code points
* before or after {@code index} to match
* {@code codePointOffset}.
* @see Character
* @see Character#offsetByCodePoints(char[], int, int, int, int)
* @since 1.5
*/
public int offsetByCodePoints(int index, int codePointOffset) {
return Character.offsetByCodePoints(value, 0, count, index,
codePointOffset);
}
}
