Thu, 10 Jun 2010 09:29:23 +0100
6945418: Project Coin: Simplified Varargs Method Invocation
Summary: Add new mandatory warning for unsafe vararg method declaration. Warning can be suppressed as usual (@SuppressWarnings("varargs")/-Xlint:-varargs)
Reviewed-by: jjg, darcy
1 /*
2 * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.util;
28 /** An abstraction for internal compiler strings. They are stored in
29 * Utf8 format. Names are stored in a Name.Table, and are unique within
30 * that table.
31 *
32 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
33 * you write code that depends on this, you do so at your own risk.
34 * This code and its internal interfaces are subject to change or
35 * deletion without notice.</b>
36 */
37 public abstract class Name implements javax.lang.model.element.Name {
39 public final Table table;
41 protected Name(Table table) {
42 this.table = table;
43 }
45 /**
46 * @inheritDoc
47 */
48 public boolean contentEquals(CharSequence cs) {
49 return toString().equals(cs.toString());
50 }
52 /**
53 * @inheritDoc
54 */
55 public int length() {
56 return toString().length();
57 }
59 /**
60 * @inheritDoc
61 */
62 public char charAt(int index) {
63 return toString().charAt(index);
64 }
66 /**
67 * @inheritDoc
68 */
69 public CharSequence subSequence(int start, int end) {
70 return toString().subSequence(start, end);
71 }
73 /** Return the concatenation of this name and name `n'.
74 */
75 public Name append(Name n) {
76 int len = getByteLength();
77 byte[] bs = new byte[len + n.getByteLength()];
78 getBytes(bs, 0);
79 n.getBytes(bs, len);
80 return table.fromUtf(bs, 0, bs.length);
81 }
83 /** Return the concatenation of this name, the given ASCII
84 * character, and name `n'.
85 */
86 public Name append(char c, Name n) {
87 int len = getByteLength();
88 byte[] bs = new byte[len + 1 + n.getByteLength()];
89 getBytes(bs, 0);
90 bs[len] = (byte) c;
91 n.getBytes(bs, len+1);
92 return table.fromUtf(bs, 0, bs.length);
93 }
95 /** An arbitrary but consistent complete order among all Names.
96 */
97 public int compareTo(Name other) {
98 return other.getIndex() - this.getIndex();
99 }
101 /** Return true if this is the empty name.
102 */
103 public boolean isEmpty() {
104 return getByteLength() == 0;
105 }
107 /** Returns last occurrence of byte b in this name, -1 if not found.
108 */
109 public int lastIndexOf(byte b) {
110 byte[] bytes = getByteArray();
111 int offset = getByteOffset();
112 int i = getByteLength() - 1;
113 while (i >= 0 && bytes[offset + i] != b) i--;
114 return i;
115 }
117 /** Does this name start with prefix?
118 */
119 public boolean startsWith(Name prefix) {
120 byte[] thisBytes = this.getByteArray();
121 int thisOffset = this.getByteOffset();
122 int thisLength = this.getByteLength();
123 byte[] prefixBytes = prefix.getByteArray();
124 int prefixOffset = prefix.getByteOffset();
125 int prefixLength = prefix.getByteLength();
127 int i = 0;
128 while (i < prefixLength &&
129 i < thisLength &&
130 thisBytes[thisOffset + i] == prefixBytes[prefixOffset + i])
131 i++;
132 return i == prefixLength;
133 }
135 /** Returns the sub-name starting at position start, up to and
136 * excluding position end.
137 */
138 public Name subName(int start, int end) {
139 if (end < start) end = start;
140 return table.fromUtf(getByteArray(), getByteOffset() + start, end - start);
141 }
143 /** Return the string representation of this name.
144 */
145 public String toString() {
146 return Convert.utf2string(getByteArray(), getByteOffset(), getByteLength());
147 }
149 /** Return the Utf8 representation of this name.
150 */
151 public byte[] toUtf() {
152 byte[] bs = new byte[getByteLength()];
153 getBytes(bs, 0);
154 return bs;
155 }
157 /* Get a "reasonably small" value that uniquely identifies this name
158 * within its name table.
159 */
160 public abstract int getIndex();
162 /** Get the length (in bytes) of this name.
163 */
164 public abstract int getByteLength();
166 /** Returns i'th byte of this name.
167 */
168 public abstract byte getByteAt(int i);
170 /** Copy all bytes of this name to buffer cs, starting at start.
171 */
172 public void getBytes(byte cs[], int start) {
173 System.arraycopy(getByteArray(), getByteOffset(), cs, start, getByteLength());
174 }
176 /** Get the underlying byte array for this name. The contents of the
177 * array must not be modified.
178 */
179 public abstract byte[] getByteArray();
181 /** Get the start offset of this name within its byte array.
182 */
183 public abstract int getByteOffset();
185 /** An abstraction for the hash table used to create unique Name instances.
186 */
187 public static abstract class Table {
188 /** Standard name table.
189 */
190 public final Names names;
192 Table(Names names) {
193 this.names = names;
194 }
196 /** Get the name from the characters in cs[start..start+len-1].
197 */
198 public abstract Name fromChars(char[] cs, int start, int len);
200 /** Get the name for the characters in string s.
201 */
202 public Name fromString(String s) {
203 char[] cs = s.toCharArray();
204 return fromChars(cs, 0, cs.length);
205 }
207 /** Get the name for the bytes in array cs.
208 * Assume that bytes are in utf8 format.
209 */
210 public Name fromUtf(byte[] cs) {
211 return fromUtf(cs, 0, cs.length);
212 }
214 /** get the name for the bytes in cs[start..start+len-1].
215 * Assume that bytes are in utf8 format.
216 */
217 public abstract Name fromUtf(byte[] cs, int start, int len);
219 /** Release any resources used by this table.
220 */
221 public abstract void dispose();
223 /** The hashcode of a name.
224 */
225 protected static int hashValue(byte bytes[], int offset, int length) {
226 int h = 0;
227 int off = offset;
229 for (int i = 0; i < length; i++) {
230 h = (h << 5) - h + bytes[off++];
231 }
232 return h;
233 }
235 /** Compare two subarrays
236 */
237 protected static boolean equals(byte[] bytes1, int offset1,
238 byte[] bytes2, int offset2, int length) {
239 int i = 0;
240 while (i < length && bytes1[offset1 + i] == bytes2[offset2 + i]) {
241 i++;
242 }
243 return i == length;
244 }
245 }
246 }