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96 lines
4.0 KiB
96 lines
4.0 KiB
4 months ago
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#ifndef DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_DESERIALIZER_IMPL_H_ // NOLINT
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#define DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_DESERIALIZER_IMPL_H_ // NOLINT
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#include <libxml/tree.h>
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#include <map>
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#include <mutex> // NOLINT(build/c++11)
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#include <string>
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#include "base/port.h"
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#include "xmpmeta/xml/deserializer.h"
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namespace dynamic_depth {
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namespace xmpmeta {
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namespace xml {
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// Deserializes an XML node.
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// Example:
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// xmlNodePtr device_node =
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// DepthFirstSearch(xmp.ExtendedSection(), "Device", "Description");
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// DeserializerImpl deserializer(device_node);
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// string revision;
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// deserializer.ParseString("Device", "Revision", &revision);
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// TODO(miraleung): Add example for list node deserializer.
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class DeserializerImpl : public Deserializer {
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public:
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// Creates a deserializer with a null rdf:Seq node.
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explicit DeserializerImpl(const xmlNodePtr node);
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// Returns a Deserializer.
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// If prefix is empty, the deserializer will be created on the first node
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// found with a name that matches child_name.
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// child_name is the name of the next node to deserialize.
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std::unique_ptr<Deserializer> CreateDeserializer(
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const string& prefix, const string& child_name) const override;
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// Returns a Deserializer from a list element node, if one is available as
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// a descendant of node_.
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// If prefix is empty, the deserializer will be created on the first node
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// found with a name that matches child_name.
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// Returns null if seq_node_ is null or if the index is out of range.
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std::unique_ptr<Deserializer> CreateDeserializerFromListElementAt(
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const string& prefix, const string& list_name, int index) const override;
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// Parsers for XML properties.
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// If prefix is empty, the node's namespace may be null. Otherwise, it must
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// not be null.
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bool ParseBase64(const string& prefix, const string& name,
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string* value) const override;
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bool ParseIntArrayBase64(const string& prefix, const string& name,
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std::vector<int>* values) const override;
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bool ParseFloatArrayBase64(const string& prefix, const string& name,
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std::vector<float>* values) const override;
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bool ParseDoubleArrayBase64(const string& prefix, const string& name,
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std::vector<double>* values) const override;
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bool ParseBoolean(const string& prefix, const string& name,
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bool* value) const override;
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bool ParseDouble(const string& prefix, const string& name,
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double* value) const override;
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bool ParseInt(const string& prefix, const string& name,
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int* value) const override;
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bool ParseFloat(const string& prefix, const string& name,
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float* value) const override;
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bool ParseLong(const string& prefix, const string& name,
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int64* value) const override;
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bool ParseString(const string& prefix, const string& name,
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string* value) const override;
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// Parses the numbers in an rdf:Seq list into the values collection.
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// The given collection is cleared of any existing values, and the
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// parsed numbers are written to it.
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bool ParseIntArray(const string& prefix, const string& list_name,
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std::vector<int>* values) const override;
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bool ParseDoubleArray(const string& prefix, const string& list_name,
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std::vector<double>* values) const override;
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// Disallow copying.
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DeserializerImpl(const DeserializerImpl&) = delete;
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void operator=(const DeserializerImpl&) = delete;
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private:
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xmlNodePtr node_;
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// Remembers the parent node of the last deserializer created on the rdf:Seq
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// node. For performance reasons only, to avoid unnessarily traversing
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// the XML document tree.
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mutable xmlNodePtr list_node_;
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// Lock modifications of list_node_ in const functions to make it thread-safe.
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mutable std::mutex mtx_;
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};
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} // namespace xml
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} // namespace xmpmeta
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} // namespace dynamic_depth
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#endif // DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_DESERIALIZER_IMPL_H_ // NOLINT
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