27
28 import java.util.Arrays;
29
30 /**
31 * This class implements a character buffer that can be used as an Writer.
32 * The buffer automatically grows when data is written to the stream. The data
33 * can be retrieved using toCharArray() and toString().
34 * <P>
35 * Note: Invoking close() on this class has no effect, and methods
36 * of this class can be called after the stream has closed
37 * without generating an IOException.
38 *
39 * @author Herb Jellinek
40 * @since 1.1
41 */
42 public
43 class CharArrayWriter extends Writer {
44 /**
45 * The buffer where data is stored.
46 */
47 protected char buf[];
48
49 /**
50 * The number of chars in the buffer.
51 */
52 protected int count;
53
54 /**
55 * Creates a new CharArrayWriter.
56 */
57 public CharArrayWriter() {
58 this(32);
59 }
60
61 /**
62 * Creates a new CharArrayWriter with the specified initial size.
63 *
64 * @param initialSize an int specifying the initial buffer size.
65 * @exception IllegalArgumentException if initialSize is negative
66 */
67 public CharArrayWriter(int initialSize) {
80 int newcount = count + 1;
81 if (newcount > buf.length) {
82 buf = Arrays.copyOf(buf, Math.max(buf.length << 1, newcount));
83 }
84 buf[count] = (char)c;
85 count = newcount;
86 }
87 }
88
89 /**
90 * Writes characters to the buffer.
91 * @param c the data to be written
92 * @param off the start offset in the data
93 * @param len the number of chars that are written
94 *
95 * @throws IndexOutOfBoundsException
96 * If {@code off} is negative, or {@code len} is negative,
97 * or {@code off + len} is negative or greater than the length
98 * of the given array
99 */
100 public void write(char c[], int off, int len) {
101 if ((off < 0) || (off > c.length) || (len < 0) ||
102 ((off + len) > c.length) || ((off + len) < 0)) {
103 throw new IndexOutOfBoundsException();
104 } else if (len == 0) {
105 return;
106 }
107 synchronized (lock) {
108 int newcount = count + len;
109 if (newcount > buf.length) {
110 buf = Arrays.copyOf(buf, Math.max(buf.length << 1, newcount));
111 }
112 System.arraycopy(c, off, buf, count, len);
113 count = newcount;
114 }
115 }
116
117 /**
118 * Write a portion of a string to the buffer.
119 * @param str String to be written from
120 * @param off Offset from which to start reading characters
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27
28 import java.util.Arrays;
29
30 /**
31 * This class implements a character buffer that can be used as an Writer.
32 * The buffer automatically grows when data is written to the stream. The data
33 * can be retrieved using toCharArray() and toString().
34 * <P>
35 * Note: Invoking close() on this class has no effect, and methods
36 * of this class can be called after the stream has closed
37 * without generating an IOException.
38 *
39 * @author Herb Jellinek
40 * @since 1.1
41 */
42 public
43 class CharArrayWriter extends Writer {
44 /**
45 * The buffer where data is stored.
46 */
47 protected char[] buf;
48
49 /**
50 * The number of chars in the buffer.
51 */
52 protected int count;
53
54 /**
55 * Creates a new CharArrayWriter.
56 */
57 public CharArrayWriter() {
58 this(32);
59 }
60
61 /**
62 * Creates a new CharArrayWriter with the specified initial size.
63 *
64 * @param initialSize an int specifying the initial buffer size.
65 * @exception IllegalArgumentException if initialSize is negative
66 */
67 public CharArrayWriter(int initialSize) {
80 int newcount = count + 1;
81 if (newcount > buf.length) {
82 buf = Arrays.copyOf(buf, Math.max(buf.length << 1, newcount));
83 }
84 buf[count] = (char)c;
85 count = newcount;
86 }
87 }
88
89 /**
90 * Writes characters to the buffer.
91 * @param c the data to be written
92 * @param off the start offset in the data
93 * @param len the number of chars that are written
94 *
95 * @throws IndexOutOfBoundsException
96 * If {@code off} is negative, or {@code len} is negative,
97 * or {@code off + len} is negative or greater than the length
98 * of the given array
99 */
100 public void write(char[] c, int off, int len) {
101 if ((off < 0) || (off > c.length) || (len < 0) ||
102 ((off + len) > c.length) || ((off + len) < 0)) {
103 throw new IndexOutOfBoundsException();
104 } else if (len == 0) {
105 return;
106 }
107 synchronized (lock) {
108 int newcount = count + len;
109 if (newcount > buf.length) {
110 buf = Arrays.copyOf(buf, Math.max(buf.length << 1, newcount));
111 }
112 System.arraycopy(c, off, buf, count, len);
113 count = newcount;
114 }
115 }
116
117 /**
118 * Write a portion of a string to the buffer.
119 * @param str String to be written from
120 * @param off Offset from which to start reading characters
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