1 files changed, 163 insertions, 0 deletions
diff --git a/cpp/lib/common/framing/Value.h b/cpp/lib/common/framing/Value.h
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+++ b/cpp/lib/common/framing/Value.h
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+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ *
+ */
+#include <iostream>
+#include <vector>
+#include <amqp_types.h>
+#include <FieldTable.h>
+
+#ifndef _Value_
+#define _Value_
+
+namespace qpid {
+namespace framing {
+
+class Buffer;
+
+/**
+ * Represents a decimal value.
+ * No arithmetic functionality for now, we only care about encoding/decoding.
+ */
+struct Decimal {
+    u_int32_t value;
+    u_int8_t decimals;
+
+    Decimal(u_int32_t value_=0, u_int8_t decimals_=0) : value(value_), decimals(decimals_) {}
+    bool operator==(const Decimal& d) const {
+        return decimals == d.decimals && value == d.value;
+    }
+    bool operator!=(const Decimal& d) const { return !(*this == d); }
+};
+
+std::ostream& operator<<(std::ostream& out, const Decimal& d);
+
+/**
+ * Polymorpic base class for values.
+ */
+class Value {
+  public:
+    virtual ~Value();
+    virtual u_int32_t size() const = 0;
+    virtual char getType() const = 0;
+    virtual void encode(Buffer& buffer) = 0;
+    virtual void decode(Buffer& buffer) = 0;
+    virtual bool operator==(const Value&) const = 0;
+    bool operator!=(const Value& v) const { return !(*this == v); }
+    virtual void print(std::ostream& out) const = 0;
+
+    /** Create a new value by decoding from the buffer */
+    static std::auto_ptr<Value> decode_value(Buffer& buffer);
+};
+
+std::ostream& operator<<(std::ostream& out, const Value& d);
+
+
+/**
+ * Template for common operations on Value sub-classes.
+ */
+template <class T>
+class ValueOps : public Value
+{
+  protected:
+    T value;
+  public:
+    ValueOps() {}
+    ValueOps(const T& v) : value(v) {}
+    const T& getValue() const { return value; }
+    T& getValue() { return value; }
+
+    virtual bool operator==(const Value& v) const {
+        const ValueOps<T>* vo = dynamic_cast<const ValueOps<T>*>(&v);
+        if (vo == 0) return false;
+        else return value == vo->value;
+    }
+
+    void print(std::ostream& out) const { out << value; }
+};
+
+
+class StringValue : public ValueOps<std::string> {
+  public:
+    StringValue(const std::string& v) : ValueOps<std::string>(v) {}
+    StringValue() {}
+    virtual u_int32_t size() const { return 4 + value.length(); }
+    virtual char getType() const { return 'S'; }
+    virtual void encode(Buffer& buffer);
+    virtual void decode(Buffer& buffer);
+};
+
+class IntegerValue : public ValueOps<int> {
+  public:
+    IntegerValue(int v) : ValueOps<int>(v) {}
+    IntegerValue(){}
+    virtual u_int32_t size() const { return 4; }
+    virtual char getType() const { return 'I'; }
+    virtual void encode(Buffer& buffer);
+    virtual void decode(Buffer& buffer);
+};
+
+class TimeValue : public ValueOps<u_int64_t> {
+  public:
+    TimeValue(u_int64_t v) : ValueOps<u_int64_t>(v){}
+    TimeValue(){}
+    virtual u_int32_t size() const { return 8; }
+    virtual char getType() const { return 'T'; }
+    virtual void encode(Buffer& buffer);
+    virtual void decode(Buffer& buffer);
+};
+
+class DecimalValue : public ValueOps<Decimal> {
+  public:
+    DecimalValue(const Decimal& d) : ValueOps<Decimal>(d) {} 
+    DecimalValue(u_int32_t value_=0, u_int8_t decimals_=0) :
+        ValueOps<Decimal>(Decimal(value_, decimals_)){}
+    virtual u_int32_t size() const { return 5; }
+    virtual char getType() const { return 'D'; }
+    virtual void encode(Buffer& buffer);
+    virtual void decode(Buffer& buffer);
+};
+
+
+class FieldTableValue : public ValueOps<FieldTable> {
+  public:
+    FieldTableValue(const FieldTable& v) : ValueOps<FieldTable>(v){}
+    FieldTableValue(){}
+    virtual u_int32_t size() const { return 4 + value.size(); }
+    virtual char getType() const { return 'F'; }
+    virtual void encode(Buffer& buffer);
+    virtual void decode(Buffer& buffer);
+};
+
+class EmptyValue : public Value {
+  public:
+    ~EmptyValue();
+    virtual u_int32_t size() const { return 0; }
+    virtual char getType() const { return 0; }
+    virtual void encode(Buffer& ) {}
+    virtual void decode(Buffer& ) {}
+    virtual bool operator==(const Value& v) const {
+        return dynamic_cast<const EmptyValue*>(&v);
+    }
+    virtual void print(std::ostream& out) const;
+};
+
+}} // qpid::framing
+
+#endif