From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- .../classpath/gnu/java/lang/CPStringBuilder.java | 1161 ++++++++++++++++++++ 1 file changed, 1161 insertions(+) create mode 100644 libjava/classpath/gnu/java/lang/CPStringBuilder.java (limited to 'libjava/classpath/gnu/java/lang/CPStringBuilder.java') diff --git a/libjava/classpath/gnu/java/lang/CPStringBuilder.java b/libjava/classpath/gnu/java/lang/CPStringBuilder.java new file mode 100644 index 000000000..f42629d46 --- /dev/null +++ b/libjava/classpath/gnu/java/lang/CPStringBuilder.java @@ -0,0 +1,1161 @@ +/* ClasspathStringBuffer.java -- Growable strings without locking or copying + Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2008 + Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.lang; + +import gnu.classpath.SystemProperties; + +import java.io.Serializable; + +/** + * This class is based on java.lang.AbstractStringBuffer but + * without the copying of the string by toString. + * If you modify this, please consider also modifying that code. + * This code is not thread-safe; limit its use to internal use within + * methods. + */ +public final class CPStringBuilder + implements Serializable, CharSequence, Appendable +{ + + /** + * Index of next available character (and thus the size of the current + * string contents). Note that this has permissions set this way so that + * String can get the value. + * + * @serial the number of characters in the buffer + */ + private int count; + + /** + * The buffer. Note that this has permissions set this way so that String + * can get the value. + * + * @serial the buffer + */ + private char[] value; + + /** + * A flag to denote whether the string being created has been + * allocated to a {@link String} object. On construction, + * the character array, {@link #value} is referenced only + * by this class. Once {@link #toString()}, + * {@link #substring(int)} or {@link #substring(int,int)} + * are called, the array is also referenced by a {@link String} + * object and this flag is set. Subsequent modifications to + * this buffer cause a new array to be allocated and the flag + * to be reset. + */ + private boolean allocated = false; + + /** + * The default capacity of a buffer. + * This can be configured using gnu.classpath.cpstringbuilder.capacity + */ + private static final int DEFAULT_CAPACITY; + + static + { + String cap = + SystemProperties.getProperty("gnu.classpath.cpstringbuilder.capacity"); + if (cap == null) + DEFAULT_CAPACITY = 32; + else + DEFAULT_CAPACITY = Integer.parseInt(cap); + } + + /** + * Create a new CPStringBuilder with the default capacity. + */ + public CPStringBuilder() + { + this(DEFAULT_CAPACITY); + } + + /** + * Create an empty CPStringBuilder with the specified initial + * capacity. + * + * @param capacity the initial capacity + * @throws NegativeArraySizeException if capacity is negative + */ + public CPStringBuilder(int capacity) + { + value = new char[capacity]; + } + + /** + * Create a new CPStringBuilder with the characters in the + * specified String. Initial capacity will be the size of the + * String plus the default capacity. + * + * @param str the String to convert + * @throws NullPointerException if str is null + */ + public CPStringBuilder(String str) + { + count = str.length(); + value = new char[count + DEFAULT_CAPACITY]; + str.getChars(0, count, value, 0); + } + + /** + * Create a new CPStringBuilder with the characters in the + * specified StringBuffer. Initial capacity will be the size of the + * String plus the default capacity. + * + * @param str the String to convert + * @throws NullPointerException if str is null + */ + public CPStringBuilder(StringBuffer str) + { + count = str.length(); + value = new char[count + DEFAULT_CAPACITY]; + str.getChars(0, count, value, 0); + } + + /** + * Create a new CPStringBuilder with the characters in the + * specified StringBuilder. Initial capacity will be the size of the + * String plus the default capacity. + * + * @param str the String to convert + * @throws NullPointerException if str is null + */ + public CPStringBuilder(StringBuilder str) + { + count = str.length(); + value = new char[count + DEFAULT_CAPACITY]; + str.getChars(0, count, value, 0); + } + + /** + * Create a new CPStringBuilder with the characters in the + * specified CharSequence. Initial capacity will be the + * length of the sequence plus the default capacity; if the sequence + * reports a length less than or equal to 0, then the initial capacity + * will be the default. + * + * @param seq the initializing CharSequence + * @throws NullPointerException if str is null + * @since 1.5 + */ + public CPStringBuilder(CharSequence seq) + { + int len = seq.length(); + count = len <= 0 ? 0 : len; + value = new char[count + DEFAULT_CAPACITY]; + for (int i = 0; i < len; ++i) + value[i] = seq.charAt(i); + } + + /** + * Set the length of this StringBuffer. If the new length is greater than + * the current length, all the new characters are set to '\0'. If the new + * length is less than the current length, the first newLength + * characters of the old array will be preserved, and the remaining + * characters are truncated. + * + * @param newLength the new length + * @throws IndexOutOfBoundsException if the new length is negative + * (while unspecified, this is a StringIndexOutOfBoundsException) + * @see #length() + */ + public void setLength(int newLength) + { + if (newLength < 0) + throw new StringIndexOutOfBoundsException(newLength); + + int valueLength = value.length; + + /* Always call ensureCapacity in order to preserve + copy-on-write semantics, except when the position + is simply being reset + */ + if (newLength > 0) + ensureCapacity(newLength); + + if (newLength < valueLength) + { + /* If the StringBuffer's value just grew, then we know that + value is newly allocated and the region between count and + newLength is filled with '\0'. */ + count = newLength; + } + else + { + /* The StringBuffer's value doesn't need to grow. However, + we should clear out any cruft that may exist. */ + while (count < newLength) + value[count++] = '\0'; + } + } + + /** + * Get the character at the specified index. + * + * @param index the index of the character to get, starting at 0 + * @return the character at the specified index + * @throws IndexOutOfBoundsException if index is negative or >= length() + * (while unspecified, this is a StringIndexOutOfBoundsException) + */ + public char charAt(int index) + { + if (index < 0 || index >= count) + throw new StringIndexOutOfBoundsException(index); + return value[index]; + } + + /** + * Get the code point at the specified index. This is like #charAt(int), + * but if the character is the start of a surrogate pair, and the + * following character completes the pair, then the corresponding + * supplementary code point is returned. + * @param index the index of the codepoint to get, starting at 0 + * @return the codepoint at the specified index + * @throws IndexOutOfBoundsException if index is negative or >= length() + * @since 1.5 + */ + public int codePointAt(int index) + { + return Character.codePointAt(value, index, count); + } + + /** + * Get the code point before the specified index. This is like + * #codePointAt(int), but checks the characters at index-1 and + * index-2 to see if they form a supplementary code point. + * @param index the index just past the codepoint to get, starting at 0 + * @return the codepoint at the specified index + * @throws IndexOutOfBoundsException if index is negative or >= length() + * @since 1.5 + */ + public int codePointBefore(int index) + { + // Character.codePointBefore() doesn't perform this check. We + // could use the CharSequence overload, but this is just as easy. + if (index >= count) + throw new IndexOutOfBoundsException(); + return Character.codePointBefore(value, index, 1); + } + + /** + * Get the specified array of characters. srcOffset - srcEnd + * characters will be copied into the array you pass in. + * + * @param srcOffset the index to start copying from (inclusive) + * @param srcEnd the index to stop copying from (exclusive) + * @param dst the array to copy into + * @param dstOffset the index to start copying into + * @throws NullPointerException if dst is null + * @throws IndexOutOfBoundsException if any source or target indices are + * out of range (while unspecified, source problems cause a + * StringIndexOutOfBoundsException, and dest problems cause an + * ArrayIndexOutOfBoundsException) + * @see System#arraycopy(Object, int, Object, int, int) + */ + public void getChars(int srcOffset, int srcEnd, + char[] dst, int dstOffset) + { + if (srcOffset < 0 || srcEnd > count || srcEnd < srcOffset) + throw new StringIndexOutOfBoundsException(); + System.arraycopy(value, srcOffset, dst, dstOffset, srcEnd - srcOffset); + } + + /** + * Set the character at the specified index. + * + * @param index the index of the character to set starting at 0 + * @param ch the value to set that character to + * @throws IndexOutOfBoundsException if index is negative or >= length() + * (while unspecified, this is a StringIndexOutOfBoundsException) + */ + public void setCharAt(int index, char ch) + { + if (index < 0 || index >= count) + throw new StringIndexOutOfBoundsException(index); + // Call ensureCapacity to enforce copy-on-write. + ensureCapacity(count); + value[index] = ch; + } + + /** + * Append the String value of the argument to this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param obj the Object to convert and append + * @return this StringBuffer + * @see String#valueOf(Object) + * @see #append(String) + */ + public CPStringBuilder append(Object obj) + { + return append(String.valueOf(obj)); + } + + /** + * Append the String to this StringBuffer. If + * str is null, the String "null" is appended. + * + * @param str the String to append + * @return this StringBuffer + */ + public CPStringBuilder append(String str) + { + if (str == null) + str = "null"; + int len = str.length(); + ensureCapacity(count + len); + str.getChars(0, len, value, count); + count += len; + return this; + } + + /** + * Append the StringBuilder value of the argument to this + * StringBuilder. This behaves the same as + * append((Object) stringBuffer), except it is more efficient. + * + * @param stringBuffer the StringBuilder to convert and append + * @return this StringBuilder + * @see #append(Object) + */ + public CPStringBuilder append(StringBuffer stringBuffer) + { + if (stringBuffer == null) + return append("null"); + synchronized (stringBuffer) + { + int len = stringBuffer.length(); + ensureCapacity(count + len); + stringBuffer.getChars(0, len, value, count); + count += len; + } + return this; + } + + /** + * Append the char array to this StringBuffer. + * This is similar (but more efficient) than + * append(new String(data)), except in the case of null. + * + * @param data the char[] to append + * @return this StringBuffer + * @throws NullPointerException if str is null + * @see #append(char[], int, int) + */ + public CPStringBuilder append(char[] data) + { + return append(data, 0, data.length); + } + + /** + * Append part of the char array to this + * StringBuffer. This is similar (but more efficient) than + * append(new String(data, offset, count)), except in the case + * of null. + * + * @param data the char[] to append + * @param offset the start location in str + * @param count the number of characters to get from str + * @return this StringBuffer + * @throws NullPointerException if str is null + * @throws IndexOutOfBoundsException if offset or count is out of range + * (while unspecified, this is a StringIndexOutOfBoundsException) + */ + public CPStringBuilder append(char[] data, int offset, int count) + { + if (offset < 0 || count < 0 || offset > data.length - count) + throw new StringIndexOutOfBoundsException(); + ensureCapacity(this.count + count); + System.arraycopy(data, offset, value, this.count, count); + this.count += count; + return this; + } + + /** + * Append the String value of the argument to this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param bool the boolean to convert and append + * @return this StringBuffer + * @see String#valueOf(boolean) + */ + public CPStringBuilder append(boolean bool) + { + return append(bool ? "true" : "false"); + } + + /** + * Append the char to this StringBuffer. + * + * @param ch the char to append + * @return this StringBuffer + */ + public CPStringBuilder append(char ch) + { + ensureCapacity(count + 1); + value[count++] = ch; + return this; + } + + /** + * Append the characters in the CharSequence to this + * buffer. + * + * @param seq the CharSequence providing the characters + * @return this StringBuffer + * @since 1.5 + */ + public CPStringBuilder append(CharSequence seq) + { + return append(seq, 0, seq.length()); + } + + /** + * Append some characters from the CharSequence to this + * buffer. If the argument is null, the four characters "null" are + * appended. + * + * @param seq the CharSequence providing the characters + * @param start the starting index + * @param end one past the final index + * @return this StringBuffer + * @since 1.5 + */ + public CPStringBuilder append(CharSequence seq, int start, int end) + { + if (seq == null) + return append("null"); + if (end - start > 0) + { + ensureCapacity(count + end - start); + for (; start < end; ++start) + value[count++] = seq.charAt(start); + } + return this; + } + + /** + * Append the String value of the argument to this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param inum the int to convert and append + * @return this StringBuffer + * @see String#valueOf(int) + */ + // This is native in libgcj, for efficiency. + public CPStringBuilder append(int inum) + { + return append(String.valueOf(inum)); + } + + /** + * Append the String value of the argument to this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param lnum the long to convert and append + * @return this StringBuffer + * @see String#valueOf(long) + */ + public CPStringBuilder append(long lnum) + { + return append(Long.toString(lnum, 10)); + } + + /** + * Append the String value of the argument to this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param fnum the float to convert and append + * @return this StringBuffer + * @see String#valueOf(float) + */ + public CPStringBuilder append(float fnum) + { + return append(Float.toString(fnum)); + } + + /** + * Append the String value of the argument to this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param dnum the double to convert and append + * @return this StringBuffer + * @see String#valueOf(double) + */ + public CPStringBuilder append(double dnum) + { + return append(Double.toString(dnum)); + } + + /** + * Append the code point to this StringBuffer. + * This is like #append(char), but will append two characters + * if a supplementary code point is given. + * + * @param code the code point to append + * @return this StringBuffer + * @see Character#toChars(int, char[], int) + * @since 1.5 + */ + public CPStringBuilder appendCodePoint(int code) + { + int len = Character.charCount(code); + ensureCapacity(count + len); + Character.toChars(code, value, count); + count += len; + return this; + } + + /** + * Delete characters from this StringBuffer. + * delete(10, 12) will delete 10 and 11, but not 12. It is + * harmless for end to be larger than length(). + * + * @param start the first character to delete + * @param end the index after the last character to delete + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if start or end are out of bounds + * @since 1.2 + */ + public CPStringBuilder delete(int start, int end) + { + if (start < 0 || start > count || start > end) + throw new StringIndexOutOfBoundsException(start); + if (end > count) + end = count; + ensureCapacity(count); + if (count - end != 0) + System.arraycopy(value, end, value, start, count - end); + count -= end - start; + return this; + } + + /** + * Delete a character from this StringBuffer. + * + * @param index the index of the character to delete + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if index is out of bounds + * @since 1.2 + */ + public CPStringBuilder deleteCharAt(int index) + { + return delete(index, index + 1); + } + + /** + * Replace characters between index start (inclusive) and + * end (exclusive) with str. If end + * is larger than the size of this StringBuffer, all characters after + * start are replaced. + * + * @param start the beginning index of characters to delete (inclusive) + * @param end the ending index of characters to delete (exclusive) + * @param str the new String to insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if start or end are out of bounds + * @throws NullPointerException if str is null + * @since 1.2 + */ + public CPStringBuilder replace(int start, int end, String str) + { + if (start < 0 || start > count || start > end) + throw new StringIndexOutOfBoundsException(start); + + int len = str.length(); + // Calculate the difference in 'count' after the replace. + int delta = len - (end > count ? count : end) + start; + ensureCapacity(count + delta); + + if (delta != 0 && end < count) + System.arraycopy(value, end, value, end + delta, count - end); + + str.getChars(0, len, value, start); + count += delta; + return this; + } + + /** + * Insert a subarray of the char[] argument into this + * StringBuffer. + * + * @param offset the place to insert in this buffer + * @param str the char[] to insert + * @param str_offset the index in str to start inserting from + * @param len the number of characters to insert + * @return this StringBuffer + * @throws NullPointerException if str is null + * @throws StringIndexOutOfBoundsException if any index is out of bounds + * @since 1.2 + */ + public CPStringBuilder insert(int offset, char[] str, int str_offset, int len) + { + if (offset < 0 || offset > count || len < 0 + || str_offset < 0 || str_offset > str.length - len) + throw new StringIndexOutOfBoundsException(); + ensureCapacity(count + len); + System.arraycopy(value, offset, value, offset + len, count - offset); + System.arraycopy(str, str_offset, value, offset, len); + count += len; + return this; + } + + /** + * Insert the String value of the argument into this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param offset the place to insert in this buffer + * @param obj the Object to convert and insert + * @return this StringBuffer + * @exception StringIndexOutOfBoundsException if offset is out of bounds + * @see String#valueOf(Object) + */ + public CPStringBuilder insert(int offset, Object obj) + { + return insert(offset, obj == null ? "null" : obj.toString()); + } + + /** + * Insert the String argument into this + * StringBuffer. If str is null, the String "null" is used + * instead. + * + * @param offset the place to insert in this buffer + * @param str the String to insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if offset is out of bounds + */ + public CPStringBuilder insert(int offset, String str) + { + if (offset < 0 || offset > count) + throw new StringIndexOutOfBoundsException(offset); + if (str == null) + str = "null"; + int len = str.length(); + ensureCapacity(count + len); + System.arraycopy(value, offset, value, offset + len, count - offset); + str.getChars(0, len, value, offset); + count += len; + return this; + } + + /** + * Insert the CharSequence argument into this + * StringBuffer. If the sequence is null, the String + * "null" is used instead. + * + * @param offset the place to insert in this buffer + * @param sequence the CharSequence to insert + * @return this StringBuffer + * @throws IndexOutOfBoundsException if offset is out of bounds + * @since 1.5 + */ + public CPStringBuilder insert(int offset, CharSequence sequence) + { + if (sequence == null) + sequence = "null"; + return insert(offset, sequence, 0, sequence.length()); + } + + /** + * Insert a subsequence of the CharSequence argument into this + * StringBuffer. If the sequence is null, the String + * "null" is used instead. + * + * @param offset the place to insert in this buffer + * @param sequence the CharSequence to insert + * @param start the starting index of the subsequence + * @param end one past the ending index of the subsequence + * @return this StringBuffer + * @throws IndexOutOfBoundsException if offset, start, + * or end are out of bounds + * @since 1.5 + */ + public CPStringBuilder insert(int offset, CharSequence sequence, int start, int end) + { + if (sequence == null) + sequence = "null"; + if (start < 0 || end < 0 || start > end || end > sequence.length()) + throw new IndexOutOfBoundsException(); + int len = end - start; + ensureCapacity(count + len); + System.arraycopy(value, offset, value, offset + len, count - offset); + for (int i = start; i < end; ++i) + value[offset++] = sequence.charAt(i); + count += len; + return this; + } + + /** + * Insert the char[] argument into this + * StringBuffer. + * + * @param offset the place to insert in this buffer + * @param data the char[] to insert + * @return this StringBuffer + * @throws NullPointerException if data is null + * @throws StringIndexOutOfBoundsException if offset is out of bounds + * @see #insert(int, char[], int, int) + */ + public CPStringBuilder insert(int offset, char[] data) + { + return insert(offset, data, 0, data.length); + } + + /** + * Insert the String value of the argument into this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param offset the place to insert in this buffer + * @param bool the boolean to convert and insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if offset is out of bounds + * @see String#valueOf(boolean) + */ + public CPStringBuilder insert(int offset, boolean bool) + { + return insert(offset, bool ? "true" : "false"); + } + + /** + * Insert the char argument into this StringBuffer. + * + * @param offset the place to insert in this buffer + * @param ch the char to insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if offset is out of bounds + */ + public CPStringBuilder insert(int offset, char ch) + { + if (offset < 0 || offset > count) + throw new StringIndexOutOfBoundsException(offset); + ensureCapacity(count + 1); + System.arraycopy(value, offset, value, offset + 1, count - offset); + value[offset] = ch; + count++; + return this; + } + + /** + * Insert the String value of the argument into this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param offset the place to insert in this buffer + * @param inum the int to convert and insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if offset is out of bounds + * @see String#valueOf(int) + */ + public CPStringBuilder insert(int offset, int inum) + { + return insert(offset, String.valueOf(inum)); + } + + /** + * Insert the String value of the argument into this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param offset the place to insert in this buffer + * @param lnum the long to convert and insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if offset is out of bounds + * @see String#valueOf(long) + */ + public CPStringBuilder insert(int offset, long lnum) + { + return insert(offset, Long.toString(lnum, 10)); + } + + /** + * Insert the String value of the argument into this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param offset the place to insert in this buffer + * @param fnum the float to convert and insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if offset is out of bounds + * @see String#valueOf(float) + */ + public CPStringBuilder insert(int offset, float fnum) + { + return insert(offset, Float.toString(fnum)); + } + + /** + * Insert the String value of the argument into this + * StringBuffer. Uses String.valueOf() to convert + * to String. + * + * @param offset the place to insert in this buffer + * @param dnum the double to convert and insert + * @return this StringBuffer + * @throws StringIndexOutOfBoundsException if offset is out of bounds + * @see String#valueOf(double) + */ + public CPStringBuilder insert(int offset, double dnum) + { + return insert(offset, Double.toString(dnum)); + } + + /** + * Finds the first instance of a substring in this StringBuilder. + * + * @param str String to find + * @return location (base 0) of the String, or -1 if not found + * @throws NullPointerException if str is null + * @see #indexOf(String, int) + */ + public int indexOf(String str) + { + return indexOf(str, 0); + } + + /** + * Finds the first instance of a String in this StringBuffer, starting at + * a given index. If starting index is less than 0, the search starts at + * the beginning of this String. If the starting index is greater than the + * length of this String, or the substring is not found, -1 is returned. + * + * @param str String to find + * @param fromIndex index to start the search + * @return location (base 0) of the String, or -1 if not found + * @throws NullPointerException if str is null + * @since 1.4 + */ + public int indexOf(String str, int fromIndex) + { + if (fromIndex < 0) + fromIndex = 0; + int olength = str.length(); + int limit = count - olength; + String s = VMCPStringBuilder.toString(value, 0, count); + for (; fromIndex <= limit; ++fromIndex) + if (s.regionMatches(fromIndex, str, 0, olength)) + return fromIndex; + return -1; + } + + /** + * Finds the last instance of a substring in this StringBuffer. + * + * @param str String to find + * @return location (base 0) of the String, or -1 if not found + * @throws NullPointerException if str is null + * @see #lastIndexOf(String, int) + * @since 1.4 + */ + public int lastIndexOf(String str) + { + return lastIndexOf(str, count - str.length()); + } + + /** + * Finds the last instance of a String in this StringBuffer, starting at a + * given index. If starting index is greater than the maximum valid index, + * then the search begins at the end of this String. If the starting index + * is less than zero, or the substring is not found, -1 is returned. + * + * @param str String to find + * @param fromIndex index to start the search + * @return location (base 0) of the String, or -1 if not found + * @throws NullPointerException if str is null + * @since 1.4 + */ + public int lastIndexOf(String str, int fromIndex) + { + fromIndex = Math.min(fromIndex, count - str.length()); + String s = VMCPStringBuilder.toString(value, 0, count); + int olength = str.length(); + for ( ; fromIndex >= 0; fromIndex--) + if (s.regionMatches(fromIndex, str, 0, olength)) + return fromIndex; + return -1; + } + + /** + * Reverse the characters in this StringBuffer. The same sequence of + * characters exists, but in the reverse index ordering. + * + * @return this StringBuffer + */ + public CPStringBuilder reverse() + { + // Call ensureCapacity to enforce copy-on-write. + ensureCapacity(count); + for (int i = count >> 1, j = count - i; --i >= 0; ++j) + { + char c = value[i]; + value[i] = value[j]; + value[j] = c; + } + return this; + } + + /** + * This may reduce the amount of memory used by the StringBuffer, + * by resizing the internal array to remove unused space. However, + * this method is not required to resize, so this behavior cannot + * be relied upon. + * @since 1.5 + */ + public void trimToSize() + { + int wouldSave = value.length - count; + // Some random heuristics: if we save less than 20 characters, who + // cares. + if (wouldSave < 20) + return; + // If we save more than 200 characters, shrink. + // If we save more than 1/4 of the buffer, shrink. + if (wouldSave > 200 || wouldSave * 4 > value.length) + allocateArray(count); + } + + /** + * Return the number of code points between two indices in the + * StringBuffer. An unpaired surrogate counts as a + * code point for this purpose. Characters outside the indicated + * range are not examined, even if the range ends in the middle of a + * surrogate pair. + * + * @param start the starting index + * @param end one past the ending index + * @return the number of code points + * @since 1.5 + */ + public int codePointCount(int start, int end) + { + if (start < 0 || end >= count || start > end) + throw new StringIndexOutOfBoundsException(); + + int count = 0; + while (start < end) + { + char base = value[start]; + if (base < Character.MIN_HIGH_SURROGATE + || base > Character.MAX_HIGH_SURROGATE + || start == end + || start == count + || value[start + 1] < Character.MIN_LOW_SURROGATE + || value[start + 1] > Character.MAX_LOW_SURROGATE) + { + // Nothing. + } + else + { + // Surrogate pair. + ++start; + } + ++start; + ++count; + } + return count; + } + + /** + * Starting at the given index, this counts forward by the indicated + * number of code points, and then returns the resulting index. An + * unpaired surrogate counts as a single code point for this + * purpose. + * + * @param start the starting index + * @param codePoints the number of code points + * @return the resulting index + * @since 1.5 + */ + public int offsetByCodePoints(int start, int codePoints) + { + while (codePoints > 0) + { + char base = value[start]; + if (base < Character.MIN_HIGH_SURROGATE + || base > Character.MAX_HIGH_SURROGATE + || start == count + || value[start + 1] < Character.MIN_LOW_SURROGATE + || value[start + 1] > Character.MAX_LOW_SURROGATE) + { + // Nothing. + } + else + { + // Surrogate pair. + ++start; + } + ++start; + --codePoints; + } + return start; + } + + /** + * Increase the capacity of this StringBuilder. This will + * ensure that an expensive growing operation will not occur until either + * minimumCapacity is reached or the array has been allocated. + * The buffer is grown to either minimumCapacity * 2, if + * the array has been allocated or the larger of minimumCapacity and + * capacity() * 2 + 2, if it is not already large enough. + * + * @param minimumCapacity the new capacity + * @see #length() + */ + public void ensureCapacity(int minimumCapacity) + { + if (allocated || minimumCapacity > value.length) + { + if (minimumCapacity > value.length) + { + int max = value.length * 2 + 2; + minimumCapacity = (minimumCapacity < max ? max : minimumCapacity); + } + else + minimumCapacity *= 2; + allocateArray(minimumCapacity); + } + } + + /** + * Allocates a new character array. This method is triggered when + * a write is attempted after the array has been passed to a + * {@link String} object, so that the builder does not modify + * the immutable {@link String}. + * + * @param capacity the size of the new array. + */ + private void allocateArray(int capacity) + { + char[] nb = new char[capacity]; + System.arraycopy(value, 0, nb, 0, count); + value = nb; + allocated = false; + } + + /** + * Get the length of the String this StringBuilder + * would create. Not to be confused with the capacity of the + * StringBuilder. + * + * @return the length of this StringBuilder + * @see #capacity() + * @see #setLength(int) + */ + public int length() + { + return count; + } + + /** + * Creates a substring of this StringBuilder, starting at a specified index + * and ending at one character before a specified index. This is implemented + * the same as substring(beginIndex, endIndex), to satisfy + * the CharSequence interface. + * + * @param beginIndex index to start at (inclusive, base 0) + * @param endIndex index to end at (exclusive) + * @return new String which is a substring of this StringBuilder + * @throws IndexOutOfBoundsException if beginIndex or endIndex is out of + * bounds + * @see #substring(int, int) + */ + public CharSequence subSequence(int beginIndex, int endIndex) + { + return substring(beginIndex, endIndex); + } + + /** + * Creates a substring of this CPStringBuilder, starting at a specified index + * and ending at the end of this StringBuilder. + * + * @param beginIndex index to start substring (base 0) + * @return new String which is a substring of this StringBuilder + * @throws StringIndexOutOfBoundsException if beginIndex is out of bounds + * @see #substring(int, int) + */ + public String substring(int beginIndex) + { + return substring(beginIndex, count); + } + + /** + * Creates a substring of this CPStringBuilder, starting at a specified index + * and ending at one character before a specified index. + * + * @param beginIndex index to start at (inclusive, base 0) + * @param endIndex index to end at (exclusive) + * @return new String which is a substring of this StringBuilder + * @throws StringIndexOutOfBoundsException if beginIndex or endIndex is out + * of bounds + */ + public String substring(int beginIndex, int endIndex) + { + if (beginIndex < 0 || endIndex > count || endIndex < beginIndex) + throw new StringIndexOutOfBoundsException(); + int len = endIndex - beginIndex; + if (len == 0) + return ""; + allocated = true; + return VMCPStringBuilder.toString(value, beginIndex, len); + } + + /** + * Convert this CPStringBuilder to a String. The + * String is composed of the characters currently in this StringBuilder. Note + * that the result is not a copy, so we flag this here and make sure to + * allocate a new array on the next write attempt (see {@link #ensureCapacity(int)}). + * + * @return the characters in this StringBuilder + */ + public String toString() + { + allocated = true; + return VMCPStringBuilder.toString(value, 0, count); + } + +} -- cgit v1.2.3