1 /**************************************************************
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 *************************************************************/
21
22
23
24 // MARKER(update_precomp.py): autogen include statement, do not remove
25 #include "precompiled_sal.hxx"
26
27 #include "hash.h"
28 #include "strimp.h"
29
30 #include <hash_set>
31
32 namespace {
33
34 struct UStringHash
35 {
operator ()__anon642635e30111::UStringHash36 size_t operator()(rtl_uString * const &rString) const
37 { return (size_t)rtl_ustr_hashCode_WithLength( rString->buffer, rString->length ); }
38 };
39
40 struct UStringEqual
41 {
operator ()__anon642635e30111::UStringEqual42 sal_Bool operator() ( rtl_uString * const &pStringA,
43 rtl_uString * const &pStringB) const
44 {
45 if (pStringA == pStringB)
46 return true;
47 if (pStringA->length != pStringB->length)
48 return false;
49 return !rtl_ustr_compare_WithLength( pStringA->buffer, pStringA->length,
50 pStringB->buffer, pStringB->length);
51 }
52 };
53
54 typedef std::hash_set< rtl_uString *, UStringHash, UStringEqual > StringHashTable;
55
56 StringHashTable *
getHashTable()57 getHashTable ()
58 {
59 static StringHashTable *pInternPool = NULL;
60 if (pInternPool == NULL) {
61 static StringHashTable aImpl(1024);
62 pInternPool = &aImpl;
63 }
64 return pInternPool;
65 }
66
67 }
68
69 extern "C" {
70
71 rtl_uString *
rtl_str_hash_intern(rtl_uString * pString,int can_return)72 rtl_str_hash_intern (rtl_uString *pString,
73 int can_return)
74 {
75 StringHashTable *pHash = getHashTable();
76 StringHashTable::iterator aIter;
77 aIter = pHash->find(pString);
78 if (aIter != pHash->end())
79 {
80 rtl_uString *pHashStr = *aIter;
81 rtl_uString_acquire (pHashStr);
82 return pHashStr;
83 }
84 if (!can_return)
85 {
86 rtl_uString *pCopy = NULL;
87 rtl_uString_newFromString( &pCopy, pString );
88 pString = pCopy;
89 if (!pString)
90 return NULL;
91 }
92
93 if (!SAL_STRING_IS_STATIC (pString))
94 pString->refCount |= SAL_STRING_INTERN_FLAG;
95 pHash->insert(pString);
96
97 return pString;
98 }
99
100 void
rtl_str_hash_remove(rtl_uString * pString)101 rtl_str_hash_remove (rtl_uString *pString)
102 {
103 getHashTable()->erase(pString);
104 }
105
106 }
107