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add methods to StringBuilder and fix logic error in getChars

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This commit is contained in:
Joel Dice 2009-08-13 09:02:00 -06:00
parent ae02212dd9
commit 0d7a2fa2bc
2 changed files with 39 additions and 13 deletions
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6
classpath/java/lang/StringBuffer.java
View File

@ -129,10 +129,10 @@ public class StringBuffer implements CharSequence {
sb.setCharAt(index, ch);
}
public synchronized void getChars(int srcOffset, int srcLength, char[] dst,
int dstOffset)
public synchronized void getChars(int srcStart, int srcEnd, char[] dst,
int dstStart)
{
sb.getChars(srcOffset, srcLength, dst, dstOffset);
sb.getChars(srcStart, srcEnd, dst, dstStart);
}
public synchronized String toString() {

46
classpath/java/lang/StringBuilder.java
View File

@ -248,6 +248,29 @@ public class StringBuilder implements CharSequence, Appendable {
return -1;
}
public int lastIndexOf(String s) {
return lastIndexOf(s, length - s.length());
}
public int lastIndexOf(String s, int lastIndex) {
int slength = s.length();
if (slength == 0) return lastIndex;
for (int i = Math.min(length - slength, lastIndex); i >= 0; --i) {
int j = 0;
for (; j < slength && i + j < length; ++j) {
if (charAt(i + j) != s.charAt(j)) {
break;
}
}
if (j == slength) {
return i;
}
}
return -1;
}
public int length() {
return length;
@ -283,9 +306,8 @@ public class StringBuilder implements CharSequence, Appendable {
}
}
public void getChars(int srcOffset, int srcLength, char[] dst, int dstOffset)
{
if (srcOffset < 0 || srcOffset + srcLength > length) {
public void getChars(int srcStart, int srcEnd, char[] dst, int dstStart) {
if (srcStart < 0 || srcEnd > length) {
throw new IndexOutOfBoundsException();
}
@ -297,17 +319,17 @@ public class StringBuilder implements CharSequence, Appendable {
int end = index;
index = start;
if (start < srcOffset) {
start = srcOffset;
if (start < srcStart) {
start = srcStart;
}
if (end > srcOffset + srcLength) {
end = srcOffset + srcLength;
if (end > srcEnd) {
end = srcEnd;
}
if (start < end) {
c.value.getChars(start - index, end - start,
dst, dstOffset + (start - srcOffset));
c.value.getChars(start - index, end - index,
dst, dstStart + (start - srcStart));
}
}
}
@ -328,10 +350,14 @@ public class StringBuilder implements CharSequence, Appendable {
}
}
public String substring(int start) {
return substring(start, length);
}
public String substring(int start, int end) {
int len = end-start;
char[] buf = new char[len];
getChars(start, len, buf,0 );
getChars(start, end, buf, 0);
return new String(buf, 0, len, false);
}