136 lines
3.2 KiB
C++
136 lines
3.2 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// Sortable array of strings. STL-ish, but STL-free.
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//
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#ifndef _LIBS_UTILS_STRING_ARRAY_H
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#define _LIBS_UTILS_STRING_ARRAY_H
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#include <stdlib.h>
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#include <string.h>
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namespace android {
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//
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// An expanding array of strings. Add, get, sort, delete.
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//
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class StringArray {
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public:
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StringArray()
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: mMax(0), mCurrent(0), mArray(NULL)
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{}
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virtual ~StringArray() {
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for (int i = 0; i < mCurrent; i++)
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delete[] mArray[i];
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delete[] mArray;
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}
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//
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// Add a string. A copy of the string is made.
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//
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bool push_back(const char* str) {
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if (mCurrent >= mMax) {
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char** tmp;
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if (mMax == 0)
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mMax = 16; // initial storage
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else
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mMax *= 2;
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tmp = new char*[mMax];
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if (tmp == NULL)
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return false;
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memcpy(tmp, mArray, mCurrent * sizeof(char*));
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delete[] mArray;
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mArray = tmp;
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}
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int len = strlen(str);
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mArray[mCurrent] = new char[len+1];
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memcpy(mArray[mCurrent], str, len+1);
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mCurrent++;
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return true;
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}
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//
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// Delete an entry.
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//
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void erase(int idx) {
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if (idx < 0 || idx >= mCurrent)
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return;
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delete[] mArray[idx];
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if (idx < mCurrent-1) {
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memmove(&mArray[idx], &mArray[idx+1],
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(mCurrent-1 - idx) * sizeof(char*));
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}
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mCurrent--;
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}
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//
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// Sort the array.
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//
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void sort(int (*compare)(const void*, const void*)) {
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qsort(mArray, mCurrent, sizeof(char*), compare);
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}
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//
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// Pass this to the sort routine to do an ascending alphabetical sort.
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//
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static int cmpAscendingAlpha(const void* pstr1, const void* pstr2) {
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return strcmp(*(const char**)pstr1, *(const char**)pstr2);
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}
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//
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// Get the #of items in the array.
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//
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inline int size(void) const { return mCurrent; }
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//
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// Return entry N.
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// [should use operator[] here]
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//
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const char* getEntry(int idx) const {
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if (idx < 0 || idx >= mCurrent)
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return NULL;
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return mArray[idx];
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}
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//
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// Set entry N to specified string.
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// [should use operator[] here]
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//
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void setEntry(int idx, const char* str) {
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if (idx < 0 || idx >= mCurrent)
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return;
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delete[] mArray[idx];
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int len = strlen(str);
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mArray[idx] = new char[len+1];
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memcpy(mArray[idx], str, len+1);
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}
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private:
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int mMax;
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int mCurrent;
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char** mArray;
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};
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}; // namespace android
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#endif // _LIBS_UTILS_STRING_ARRAY_H
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