runtime/doubleconv/DtoaBuffer.java

61  * A buffer for generating string representations of doubles.
65     // The character buffer
68     // The number of characters in the buffer
83      * Create a buffer with the given capacity.
84      * @param capacity the capacity of the buffer.
91      * Append a character to the buffer, increasing its length.
99      * Clear the buffer contents and set its length to {@code 0}.
107      * Get the raw digits of this buffer as string.
108      * @return the raw buffer contents
123      * Returns the number of characters in the buffer.
124      * @return buffer length
131      * Returns the formatted buffer content as string, using the specified conversion mode
139         final StringBuilder buffer = new StringBuilder();
141             buffer.append('-');
148                     toExponentialFormat(buffer);
150                     toFixedFormat(buffer, digitsAfterPoint);
154                 toFixedFormat(buffer, digitsAfterPoint);
158                     toExponentialFormat(buffer);
160                     toFixedFormat(buffer, digitsAfterPoint);
165         return buffer.toString();
168     private void toFixedFormat(final StringBuilder buffer, final int digitsAfterPoint) {
171             buffer.append('0');
173                 buffer.append('.');
176                     buffer.append('0');
178                 buffer.append(chars, 0, length);
184             buffer.append(chars, 0, length);
186                 buffer.append('0');
190             buffer.append(chars, 0, decimalPoint);
191             buffer.append('.');
192             buffer.append(chars, decimalPoint, length - decimalPoint);
198                 buffer.append('.');
201                 buffer.append('0');
206     private void toExponentialFormat(final StringBuilder buffer) {
207         buffer.append(chars[0]);
210             buffer.append('.');
211             buffer.append(chars, 1, length - 1);
213         buffer.append('e');
216             buffer.append('+');
218         buffer.append(exponent);