upload android base code part6

android/system/core/libutils/PropertyMap.cpp

@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+#define LOG_TAG "PropertyMap"
+
+#include <utils/PropertyMap.h>
+
+// Enables debug output for the parser.
+#define DEBUG_PARSER 0
+
+// Enables debug output for parser performance.
+#define DEBUG_PARSER_PERFORMANCE 0
+
+
+namespace android {
+
+static const char* WHITESPACE = " \t\r";
+static const char* WHITESPACE_OR_PROPERTY_DELIMITER = " \t\r=";
+
+
+// --- PropertyMap ---
+
+PropertyMap::PropertyMap() {
+}
+
+PropertyMap::~PropertyMap() {
+}
+
+void PropertyMap::clear() {
+    mProperties.clear();
+}
+
+void PropertyMap::addProperty(const String8& key, const String8& value) {
+    mProperties.add(key, value);
+}
+
+bool PropertyMap::hasProperty(const String8& key) const {
+    return mProperties.indexOfKey(key) >= 0;
+}
+
+bool PropertyMap::tryGetProperty(const String8& key, String8& outValue) const {
+    ssize_t index = mProperties.indexOfKey(key);
+    if (index < 0) {
+        return false;
+    }
+
+    outValue = mProperties.valueAt(index);
+    return true;
+}
+
+bool PropertyMap::tryGetProperty(const String8& key, bool& outValue) const {
+    int32_t intValue;
+    if (!tryGetProperty(key, intValue)) {
+        return false;
+    }
+
+    outValue = intValue;
+    return true;
+}
+
+bool PropertyMap::tryGetProperty(const String8& key, int32_t& outValue) const {
+    String8 stringValue;
+    if (! tryGetProperty(key, stringValue) || stringValue.length() == 0) {
+        return false;
+    }
+
+    char* end;
+    int value = strtol(stringValue.string(), & end, 10);
+    if (*end != '\0') {
+        ALOGW("Property key '%s' has invalid value '%s'.  Expected an integer.",
+                key.string(), stringValue.string());
+        return false;
+    }
+    outValue = value;
+    return true;
+}
+
+bool PropertyMap::tryGetProperty(const String8& key, float& outValue) const {
+    String8 stringValue;
+    if (! tryGetProperty(key, stringValue) || stringValue.length() == 0) {
+        return false;
+    }
+
+    char* end;
+    float value = strtof(stringValue.string(), & end);
+    if (*end != '\0') {
+        ALOGW("Property key '%s' has invalid value '%s'.  Expected a float.",
+                key.string(), stringValue.string());
+        return false;
+    }
+    outValue = value;
+    return true;
+}
+
+void PropertyMap::addAll(const PropertyMap* map) {
+    for (size_t i = 0; i < map->mProperties.size(); i++) {
+        mProperties.add(map->mProperties.keyAt(i), map->mProperties.valueAt(i));
+    }
+}
+
+status_t PropertyMap::load(const String8& filename, PropertyMap** outMap) {
+    *outMap = NULL;
+
+    Tokenizer* tokenizer;
+    status_t status = Tokenizer::open(filename, &tokenizer);
+    if (status) {
+        ALOGE("Error %d opening property file %s.", status, filename.string());
+    } else {
+        PropertyMap* map = new PropertyMap();
+        if (!map) {
+            ALOGE("Error allocating property map.");
+            status = NO_MEMORY;
+        } else {
+#if DEBUG_PARSER_PERFORMANCE
+            nsecs_t startTime = systemTime(SYSTEM_TIME_MONOTONIC);
+#endif
+            Parser parser(map, tokenizer);
+            status = parser.parse();
+#if DEBUG_PARSER_PERFORMANCE
+            nsecs_t elapsedTime = systemTime(SYSTEM_TIME_MONOTONIC) - startTime;
+            ALOGD("Parsed property file '%s' %d lines in %0.3fms.",
+                    tokenizer->getFilename().string(), tokenizer->getLineNumber(),
+                    elapsedTime / 1000000.0);
+#endif
+            if (status) {
+                delete map;
+            } else {
+                *outMap = map;
+            }
+        }
+        delete tokenizer;
+    }
+    return status;
+}
+
+
+// --- PropertyMap::Parser ---
+
+PropertyMap::Parser::Parser(PropertyMap* map, Tokenizer* tokenizer) :
+        mMap(map), mTokenizer(tokenizer) {
+}
+
+PropertyMap::Parser::~Parser() {
+}
+
+status_t PropertyMap::Parser::parse() {
+    while (!mTokenizer->isEof()) {
+#if DEBUG_PARSER
+        ALOGD("Parsing %s: '%s'.", mTokenizer->getLocation().string(),
+                mTokenizer->peekRemainderOfLine().string());
+#endif
+
+        mTokenizer->skipDelimiters(WHITESPACE);
+
+        if (!mTokenizer->isEol() && mTokenizer->peekChar() != '#') {
+            String8 keyToken = mTokenizer->nextToken(WHITESPACE_OR_PROPERTY_DELIMITER);
+            if (keyToken.isEmpty()) {
+                ALOGE("%s: Expected non-empty property key.", mTokenizer->getLocation().string());
+                return BAD_VALUE;
+            }
+
+            mTokenizer->skipDelimiters(WHITESPACE);
+
+            if (mTokenizer->nextChar() != '=') {
+                ALOGE("%s: Expected '=' between property key and value.",
+                        mTokenizer->getLocation().string());
+                return BAD_VALUE;
+            }
+
+            mTokenizer->skipDelimiters(WHITESPACE);
+
+            String8 valueToken = mTokenizer->nextToken(WHITESPACE);
+            if (valueToken.find("\\", 0) >= 0 || valueToken.find("\"", 0) >= 0) {
+                ALOGE("%s: Found reserved character '\\' or '\"' in property value.",
+                        mTokenizer->getLocation().string());
+                return BAD_VALUE;
+            }
+
+            mTokenizer->skipDelimiters(WHITESPACE);
+            if (!mTokenizer->isEol()) {
+                ALOGE("%s: Expected end of line, got '%s'.",
+                        mTokenizer->getLocation().string(),
+                        mTokenizer->peekRemainderOfLine().string());
+                return BAD_VALUE;
+            }
+
+            if (mMap->hasProperty(keyToken)) {
+                ALOGE("%s: Duplicate property value for key '%s'.",
+                        mTokenizer->getLocation().string(), keyToken.string());
+                return BAD_VALUE;
+            }
+
+            mMap->addProperty(keyToken, valueToken);
+        }
+
+        mTokenizer->nextLine();
+    }
+    return NO_ERROR;
+}
+
+} // namespace android