eclair snapshot

libs/utils/StringArray.cpp

@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// Sortable array of strings.  STL-ish, but STL-free.
+//  
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <utils/StringArray.h>
+
+namespace android {
+
+//
+// An expanding array of strings.  Add, get, sort, delete.
+//
+StringArray::StringArray()
+    : mMax(0), mCurrent(0), mArray(NULL)
+{
+}
+
+StringArray:: ~StringArray() {
+    for (int i = 0; i < mCurrent; i++)
+        delete[] mArray[i];
+    delete[] mArray;
+}
+
+//
+// Add a string.  A copy of the string is made.
+//
+bool StringArray::push_back(const char* str) {
+    if (mCurrent >= mMax) {
+        char** tmp;
+
+        if (mMax == 0)
+            mMax = 16;      // initial storage
+        else
+            mMax *= 2;
+
+        tmp = new char*[mMax];
+        if (tmp == NULL)
+            return false;
+
+        memcpy(tmp, mArray, mCurrent * sizeof(char*));
+        delete[] mArray;
+        mArray = tmp;
+    }
+
+    int len = strlen(str);
+    mArray[mCurrent] = new char[len+1];
+    memcpy(mArray[mCurrent], str, len+1);
+    mCurrent++;
+
+    return true;
+}
+
+//
+// Delete an entry.
+//
+void StringArray::erase(int idx) {
+    if (idx < 0 || idx >= mCurrent)
+        return;
+    delete[] mArray[idx];
+    if (idx < mCurrent-1) {
+        memmove(&mArray[idx], &mArray[idx+1],
+                (mCurrent-1 - idx) * sizeof(char*));
+    }
+    mCurrent--;
+}
+
+//
+// Sort the array.
+//
+void StringArray::sort(int (*compare)(const void*, const void*)) {
+    qsort(mArray, mCurrent, sizeof(char*), compare);
+}
+
+//
+// Pass this to the sort routine to do an ascending alphabetical sort.
+//
+int StringArray::cmpAscendingAlpha(const void* pstr1, const void* pstr2) {
+    return strcmp(*(const char**)pstr1, *(const char**)pstr2);
+}
+
+//
+// Set entry N to specified string.
+// [should use operator[] here]
+//
+void StringArray::setEntry(int idx, const char* str) {
+    if (idx < 0 || idx >= mCurrent)
+        return;
+    delete[] mArray[idx];
+    int len = strlen(str);
+    mArray[idx] = new char[len+1];
+    memcpy(mArray[idx], str, len+1);
+}
+
+
+}; // namespace android