XmlFormatExtensionPointAttribute クラスとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

XmlFormatExtensionPointAttribute クラス

サービスの説明内でサービスの説明のフォーマット拡張用に使用する XML 名前空間と XML 名前空間プリフィックスを指定します。このクラスは継承できません。

名前空間: System.Web.Services.Configuration
アセンブリ: System.Web.Services (system.web.services.dll 内)
構文

Visual Basic (宣言)

<AttributeUsageAttribute(AttributeTargets.Class)> _
Public NotInheritable Class
 XmlFormatExtensionPointAttribute
    Inherits Attribute

Visual Basic (使用法)

Dim instance As XmlFormatExtensionPointAttribute

[AttributeUsageAttribute(AttributeTargets.Class)] 
public sealed class XmlFormatExtensionPointAttribute
 : Attribute

C++

[AttributeUsageAttribute(AttributeTargets::Class)] 
public ref class XmlFormatExtensionPointAttribute
 sealed : public Attribute

/** @attribute AttributeUsageAttribute(AttributeTargets.Class) */ 
public final class XmlFormatExtensionPointAttribute
 extends Attribute

JScript

AttributeUsageAttribute(AttributeTargets.Class) 
public final class XmlFormatExtensionPointAttribute
 extends Attribute

解説

サービス記述形式拡張機能は、ASP.NET を使用して作成した XML Web サービスに関するサービスの説明を生成する方法について、機能を拡張します。具体的には、サービス記述形式拡張機能によって、サービスの説明に XML 要素が追加されます。SOAP 拡張機能に関する情報は、サービスの説明には自動的に配置されません。このため、SOAP 拡張機能を XML Web サービスのクライアント側とサーバー側の両方で実行できるように構築するときに、この機能が役に立ちます。SOAP 拡張機能に関する情報をサービスの説明に追加すると、クライアントは特定の SOAP 拡張機能を実行する必要があると解釈します。クライアントとサーバーの両方で実行する必要のある SOAP 拡張機能の例には、暗号化 SOAP 拡張機能があります。暗号化 SOAP 拡張機能がサーバー上だけで実行されていて、戻り値を暗号化してからクライアントに返信する場合、クライアントは SOAP 拡張機能を実行して SOAP メッセージを復号化する必要があります。それ以外の場合、クライアントは戻り値を処理できません。

次の手順を実行して、サービス記述形式拡張機能を作成します。

ServiceDescriptionFormatExtension から派生するクラスを構築します。
XmlFormatExtensionAttribute をクラスに適用し、サービス記述形式拡張機能が実行される拡張ポイントを指定します。
オプションで、XmlFormatExtensionPointAttribute をクラスに適用し、新しい拡張ポイントとして機能するクラス内のメンバを指定します。
オプションで、XmlFormatExtensionPrefixAttribute をクラスに適用し、サービス記述形式拡張機能によって生成された XML 要素に XML 名前空間プリフィックスを関連付けるように指定します。
構成ファイルの serviceDescriptionFormatExtensionTypes セクションで実行する、サービス記述形式拡張機能を設定します。

使用例

Visual Basic

Imports System
Imports System.Security.Permissions
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.IO
Imports System.Text
Imports System.Web.Services.Configuration
Imports System.Web.Services.Description
Imports System.Xml.Serialization
Imports System.CodeDom

' The YMLAttribute allows a developer to specify that the YML SOAP
' extension run on a per-method basis.  The disabled property
' turns reversing the XML on and off. 

<AttributeUsage(AttributeTargets.Method, AllowMultiple:=False)> _
Public Class YMLAttribute
    Inherits SoapExtensionAttribute
    Dim _priority As Integer
 = 0
    Dim _disabled As Boolean
 = False

    Public Sub New()
        Me.New(False)
    End Sub

    Public Sub New(ByVal
 Disabled As Boolean)
        _disabled = Disabled
    End Sub

    Public Overrides ReadOnly
 Property ExtensionType() As Type
        Get
            Return GetType(YMLExtension)
        End Get
    End Property

    Public Overrides Property
 Priority() As Integer
        Get
            Return _priority
        End Get
        Set(ByVal Value As
 Integer)
            _priority = Value
        End Set
    End Property

    Public Property Disabled() As
 Boolean
        Get
            Return _disabled
        End Get
        Set(ByVal Value As
 Boolean)
            _disabled = Value
        End Set
    End Property
End Class

Public Class YMLExtension
    Inherits SoapExtension
    Dim _disabled As Boolean
 = False
    Dim oldStream As Stream
    Dim newStream As Stream

    Public Overloads Overrides
 Function GetInitializer( _
        ByVal methodInfo As LogicalMethodInfo,
 _
        ByVal attribute As SoapExtensionAttribute)
 As Object

        Dim attr As YMLAttribute = attribute
        If (Not attr Is
 Nothing) Then
            Return attr.Disabled
        End If
        Return False
    End Function

    Public Overloads Overrides
 Function GetInitializer( _
        ByVal WebServiceType As Type) As
 Object
        Return False
    End Function

    Public Overrides Sub
 Initialize(ByVal initializer As Object)
        If (TypeOf initializer Is
 Boolean) Then
            _disabled = CBool(initializer)
        End If
    End Sub

    Public Overrides Function
 ChainStream(ByVal streamref As Stream) As
 Stream
        If (_disabled) Then
            Return CType(Me, SoapExtension).ChainStream(streamref)
        End If
        oldStream = streamref
        newStream = New MemoryStream()
        Return newStream
    End Function

    Public Overrides Sub
 ProcessMessage(ByVal message As SoapMessage)
        If (_disabled) Then Return
        Select Case (message.Stage)
            Case SoapMessageStage.BeforeSerialize
                Encode(message)
            Case SoapMessageStage.AfterSerialize
                newStream.Position = 0
                Reverse(newStream, oldStream)
            Case SoapMessageStage.BeforeDeserialize
                Decode(message)
            Case SoapMessageStage.AfterDeserialize
        End Select
    End Sub

    Sub Encode(ByRef message As
 SoapMessage)
        message.ContentType = "text/yml"
    End Sub

    Sub Decode(ByVal message As
 SoapMessage)
        If (message.ContentType <> "text/yml")
 Then
            Throw New Exception("invalid
 content type:" & message.ContentType)
        End If
        Reverse(oldStream, newStream)
        newStream.Position = 0
        message.ContentType = "text/xml"
    End Sub

    Sub Reverse(ByVal source As
 Stream, ByVal dest As Stream)
        Dim reader As TextReader = New
 StreamReader(source)
        Dim writer As TextWriter = New
 StreamWriter(dest)
        Dim line As String
        line = reader.ReadLine()
        While (Not line Is
 Nothing)
            writer.WriteLine(StrReverse(line))
            line = reader.ReadLine()
        End While
        writer.Flush()
    End Sub
End Class


' The YMLReflector class is part of the YML SDFE, as it is
' called during the service description generation process.
<PermissionSet(SecurityAction.Demand, Name:="FullTrust")>
 _
Public Class YMLReflector
    Inherits SoapExtensionReflector
    Public Overrides Sub
 ReflectMethod()
        Dim reflector As ProtocolReflector
 = ReflectionContext
        Dim attr As YMLAttribute = _
            reflector.Method.GetCustomAttribute(GetType(YMLAttribute))
        ' If the YMLAttribute has been applied to this XML Web service
 
        ' method, add the XML defined in the YMLOperationBinding class.
        If (Not attr Is
 Nothing) Then
            Dim yml As YMLOperationBinding
 = New YMLOperationBinding()
            yml.Reverse = Not attr.Disabled
            reflector.OperationBinding.Extensions.Add(yml)
        End If
    End Sub
End Class

' The YMLImporter class is part of the YML SDFE, as it is called when
 a
' proxy class is generated for each XML Web service method the proxy
 class
' communicates with. The class checks whether the service description
' contains the XML that this SDFE adds to a service description. If
 it 
' exists, then the YMLExtension is applied to the method in the proxy
 class.
<PermissionSet(SecurityAction.Demand, Name:="FullTrust")>
 _
Public Class YMLImporter
    Inherits SoapExtensionImporter
    Public Overrides Sub
 ImportMethod( _
        ByVal metadata As CodeAttributeDeclarationCollection)
        Dim importer As SoapProtocolImporter
 = ImportContext
        ' Check whether the XML specified in the YMLOperationBinding
 is 
        ' in the service description.
        Dim yml As YMLOperationBinding = _
            importer.OperationBinding.Extensions.Find( _
            GetType(YMLOperationBinding))
        If (Not yml Is Nothing)
 Then
            ' Only apply the YMLAttribute to the method when the XML
 
            ' should be reversed.
            If (yml.Reverse) Then
                Dim attr As CodeAttributeDeclaration
 = _
                    New CodeAttributeDeclaration(GetType(YMLAttribute).FullName)
                attr.Arguments.Add( _
                    New CodeAttributeArgument(New
 CodePrimitiveExpression(True)))
                metadata.Add(attr)
            End If
        End If
    End Sub
End Class

' The YMLOperationBinding class is part of the YML SDFE, as it is the
' class that is serialized into XML and is placed in the service
' description.
<XmlFormatExtension("action", YMLOperationBinding.YMLNamespace,
 _
    GetType(OperationBinding)), _
    XmlFormatExtensionPrefix("yml", YMLOperationBinding.YMLNamespace)>
 _
Public Class YMLOperationBinding
    Inherits ServiceDescriptionFormatExtension
    Private _reverse As Boolean
    Public Const YMLNamespace As
 String = "http://www.contoso.com/yml"

    <XmlElement("Reverse")> _
    Public Property Reverse() As
 Boolean
        Get
            Return _reverse
        End Get
        Set(ByVal Value As
 Boolean)
            _reverse = Value
        End Set
    End Property

End Class

using System;
using System.Security.Permissions;
using System.CodeDom;
using System.IO;
using System.Text;
using System.Web.Services.Configuration;
using System.Web.Services.Description;
using System.Web.Services.Protocols;
using System.Xml.Serialization;


// The YMLAttribute allows a developer to specify that the YML SOAP
// extension run on a per-method basis.  The Disabled property
// turns reversing the XML on and off. 

[AttributeUsage(AttributeTargets.Method, AllowMultiple=false)]
public class YMLAttribute : SoapExtensionAttribute
 {
    int priority = 0;
    bool disabled = false;
    
    public YMLAttribute() : this(false)
 {}
    public YMLAttribute(bool disabled) 
    {
        this.disabled = disabled;
    }
    
    public override Type ExtensionType 
    {
        get { return typeof(YMLExtension);
 }
    }
    public override int Priority 
    {
        get { return priority; }
        set { priority = value; }
    }

    public bool Disabled 
    { 
        get { return disabled; }
        set { disabled = value; }
    }
}

public class YMLExtension : SoapExtension {
    bool disabled = false;
    Stream oldStream;
    Stream newStream;

    public override object GetInitializer(LogicalMethodInfo methodInfo,
 
        SoapExtensionAttribute attribute) 
    {
        YMLAttribute attr = attribute as YMLAttribute;
        if (attr != null) return
 attr.Disabled;
        return false;
    }

    public override object GetInitializer(Type serviceType) 
    {
        return false;
    }

    public override void Initialize(object
 initializer) 
    {
        if (initializer is Boolean) disabled = (bool)initializer;
    }

    public override Stream ChainStream(Stream stream) 
    {
        if (disabled) return base.ChainStream(stream);
        oldStream = stream;
        newStream = new MemoryStream();
        return newStream;
    }

    public override void ProcessMessage(SoapMessage
 message) 
    {
        if (disabled) return;
        switch (message.Stage) 
        {
        case SoapMessageStage.BeforeSerialize:
            Encode(message);
            break;
        case SoapMessageStage.AfterSerialize:
            newStream.Position = 0;
            Reverse(newStream, oldStream);
            break;
        case SoapMessageStage.BeforeDeserialize:
            Decode(message);
            break;
        case SoapMessageStage.AfterDeserialize:
            break;
        }
    }        

    void Encode(SoapMessage message) 
    {
        message.ContentType = "text/yml";
    }

    void Decode(SoapMessage message) 
    {
        if (message.ContentType != "text/yml") 
            throw new Exception(
                "invalid content type:" + message.ContentType);
        Reverse(oldStream, newStream);
        newStream.Position = 0;
        message.ContentType = "text/xml";
    }

    void Reverse(Stream from, Stream to) 
    {
        TextReader reader = new StreamReader(from);
        TextWriter writer = new StreamWriter(to);
        string line;
        while ((line = reader.ReadLine()) != null)
 
        {
            StringBuilder builder = new StringBuilder();
            for (int i = line.Length - 1; i
 >= 0; i--) 
            {
                builder.Append(line[i]);
            }
            writer.WriteLine(builder.ToString());
        }
        writer.Flush();
    }
}
// The YMLReflector class is part of the YML SDFE, as it is
// called during the service description generation process.
[PermissionSet(SecurityAction.Demand, Name="FullTrust")]
public class YMLReflector : SoapExtensionReflector
 
{
    public override void ReflectMethod() 
    {
        ProtocolReflector reflector = ReflectionContext;
        YMLAttribute attr = 
            (YMLAttribute)reflector.Method.GetCustomAttribute(
            typeof(YMLAttribute));
        // If the YMLAttribute has been applied to this XML Web service
 
        // method, add the XML defined in the YMLOperationBinding class.
        if (attr != null) 
        {
            YMLOperationBinding yml = new YMLOperationBinding();
            yml.Reverse = !(attr.Disabled);
            reflector.OperationBinding.Extensions.Add(yml);
        }
    }
}



// The YMLImporter class is part of the YML SDFE, as it is called when
 a
// proxy class is generated for each XML Web service method the proxy
 class
// communicates with. The class checks whether the service description
// contains the XML that this SDFE adds to a service description. If
 it 
// exists, then the YMLExtension is applied to the method in the proxy
 class.
[PermissionSet(SecurityAction.Demand, Name="FullTrust")]
public class YMLImporter : SoapExtensionImporter
 
{
    public override void ImportMethod(
        CodeAttributeDeclarationCollection metadata) 
    {
        SoapProtocolImporter importer = ImportContext;
        // Check whether the XML specified in the YMLOperationBinding
 
        // is in the service description.
        YMLOperationBinding yml = 
           (YMLOperationBinding)importer.OperationBinding.Extensions.Find(
           typeof(YMLOperationBinding));
        if (yml != null)
        {
            // Only apply the YMLAttribute to the method when the XML
 should
            // be reversed.
            if (yml.Reverse)
            {
                CodeAttributeDeclaration attr = 
                    new CodeAttributeDeclaration(typeof(YMLAttribute).FullName);
                attr.Arguments.Add(
                    new CodeAttributeArgument(new
 CodePrimitiveExpression(true)));
                metadata.Add(attr);
            }
        }
    }
}

// The YMLOperationBinding class is part of the YML SDFE, as it is the
// class that is serialized into XML and is placed in the service
// description.
[XmlFormatExtension("action", YMLOperationBinding.YMLNamespace, 
    typeof(OperationBinding))]
[XmlFormatExtensionPrefix("yml", YMLOperationBinding.YMLNamespace)]
public class YMLOperationBinding : ServiceDescriptionFormatExtension
 
{
    private Boolean reverse;

    public const string
 YMLNamespace = "http://www.contoso.com/yml";

    [XmlElement("Reverse")]
    public Boolean Reverse 
    {
        get { return reverse; }
        set { reverse = value; }
    }
}

import System.*;
import System.CodeDom.*;
import System.IO.*;
import System.Text.*;
import System.Web.Services.Configuration.*;
import System.Web.Services.Description.*;
import System.Web.Services.Protocols.*;
import System.Xml.Serialization.*;

// The YMLAttribute allows a developer to specify that the YML SOAP
// extension run on a per-method basis.  The Disabled property
// turns reversing the XML on and off. 
/** @attribute AttributeUsage(AttributeTargets.Method, AllowMultiple = false)
 */
public class YMLAttribute extends SoapExtensionAttribute
{
    private int priority = 0;
    private boolean disabled = false;

    public YMLAttribute()
    {
      this(false);
    } //YMLAttribute

    public YMLAttribute(boolean disabled)
    {
        this.disabled = disabled;
    } //YMLAttribute

    /** @property 
     */
    public Type get_ExtensionType()
    {
        return YMLExtension.class.ToType();
    } //get_ExtensionType

    /** @property 
     */
    public int get_Priority()
    {
        return priority;
    } //get_Priority

    /** @property 
     */
    public void set_Priority(int
 value)
    {
        priority = value;
    } //set_Priority

    /** @property 
     */
    public boolean get_Disabled()
    {
        return disabled;
    } //get_Disabled

    /** @property 
     */
    public void set_Disabled(boolean value)
    {
        disabled = value;
    } //set_Disabled
} //YMLAttribute

public class YMLExtension extends SoapExtension
{
    private boolean disabled = false;
    private Stream oldStream;
    private Stream newStream;

    public Object GetInitializer(LogicalMethodInfo methodInfo,
 
        SoapExtensionAttribute attribute)
    {
        YMLAttribute attr =(YMLAttribute)attribute;
        if (attr != null) {
            return (System.Boolean)attr.get_Disabled();
        }
        return (System.Boolean)false;
    } //GetInitializer

    public Object GetInitializer(Type serviceType)
    {
        return (System.Boolean)false;
    } //GetInitializer

    public void Initialize(Object initializer)
    {
        if (initializer instanceof Boolean) {
            disabled = System.Convert.ToBoolean(initializer);
        }
    } //Initialize

    public Stream ChainStream(Stream stream)
    {
        if (disabled) {
            return super.ChainStream(stream);
        }
        oldStream = stream;
        newStream = new MemoryStream();
        return newStream;
    } //ChainStream

    public void ProcessMessage(SoapMessage
 message) throws Exception
    {
        if (disabled) {
            return;
        }
        switch (message.get_Stage()) {
            case SoapMessageStage.BeforeSerialize:
                Encode(message);
                break;

            case SoapMessageStage.AfterSerialize:
                newStream.set_Position(0);
                Reverse(newStream, oldStream);
                break;

            case SoapMessageStage.BeforeDeserialize:
                Decode(message);
                break;

            case SoapMessageStage.AfterDeserialize:
                break;
        }
    } //ProcessMessage

    void Encode(SoapMessage message)
    {
        message.set_ContentType("text/yml");
    } //Encode

    void Decode(SoapMessage message) throws Exception
    {
        if (!(message.get_ContentType()).Equals("text/yml"))
 {
            throw new Exception("invalid content type:"
 
                + message.get_ContentType());
        }
        Reverse(oldStream, newStream);
        newStream.set_Position(0);
        message.set_ContentType("text/xml");
    } //Decode

    void Reverse(Stream from, Stream to)
    {
        TextReader reader = new StreamReader(from);
        TextWriter writer = new StreamWriter(to);
        String line;
        while ((line = reader.ReadLine()) != null)
 {
            StringBuilder builder = new StringBuilder();
            for (int i = line.get_Length()
 - 1; i >= 0; i--) {
                builder.Append(line.GetEnumerator().get_Current());
            }
            writer.WriteLine(builder.ToString());
        }
        writer.Flush();
    } //Reverse
} //YMLExtension

// The YMLReflector class is part of the YML SDFE, as it is
// called during the service description generation process.
/** @attribute System.Security.Permissions.PermissionSet(System.Security.
    Permissions.SecurityAction.Demand, Name = "FullTrust")
 */
public class YMLReflector extends SoapExtensionReflector
{
    public void ReflectMethod()
    {
        ProtocolReflector reflector = get_ReflectionContext();
        YMLAttribute attr = (YMLAttribute)(reflector.get_Method().
            GetCustomAttribute(YMLAttribute.class.ToType()));
        // If the YMLAttribute has been applied to this XML Web service
 
        // method, add the XML defined in the YMLOperationBinding class.
        if (attr != null)  {
            YMLOperationBinding yml = new YMLOperationBinding();
            yml.set_Reverse(new Boolean(!(attr.get_Disabled())));
            //yml.set_Reverse( new Boolean(!(attr.get_Disabled())));
            reflector.get_OperationBinding().get_Extensions().Add(yml);
        }
    } //ReflectMethod
} //YMLReflector

// The YMLImporter class is part of the YML SDFE, as it is called when
 a
// proxy class is generated for each XML Web service method the proxy
 class
// communicates with. The class checks whether the service description
// contains the XML that this SDFE adds to a service description. If
 it 
// exists, then the YMLExtension is applied to the method in the proxy
 class.
/** @attribute System.Security.Permissions.PermissionSet(System.Security.
    Permissions.SecurityAction.Demand, Name = "FullTrust")
 */
public class YMLImporter extends SoapExtensionImporter
{
    public void ImportMethod(CodeAttributeDeclarationCollection
 metadata)
    {
        SoapProtocolImporter importer = get_ImportContext();
        // Check whether the XML specified in the YMLOperationBinding
 
        // is in the service description.
        YMLOperationBinding yml = (YMLOperationBinding)(importer.
            get_OperationBinding().get_Extensions().
            Find(YMLOperationBinding.class.ToType()));
        if (yml != null) {
            // Only apply the YMLAttribute to the method when the XML
 should
            // be reversed.
            if (System.Boolean.Parse(yml.get_Reverse().ToString()))
 {
                CodeAttributeDeclaration attr 
                    = new CodeAttributeDeclaration(YMLAttribute.class.ToType().
                    get_FullName());

                attr.get_Arguments().Add(new CodeAttributeArgument(new
                                         CodePrimitiveExpression((System.Boolean)true)));
                metadata.Add(attr);
            }
        }
    } //ImportMethod
} //YMLImporter

// The YMLOperationBinding class is part of the YML SDFE, as it is the
// class that is serialized into XML and is placed in the service
// description.
/** @attribute XmlFormatExtension("action", YMLOperationBinding.YMLNamespace,
 
    OperationBinding.class)
 */
/** @attribute XmlFormatExtensionPrefix("yml", YMLOperationBinding.YMLNamespace)
 */
public class YMLOperationBinding extends ServiceDescriptionFormatExtension
{
    private Boolean reverse;
    public final static String YMLNamespace
 = "http://www.contoso.com/yml";

    /** @attribute XmlElement("Reverse")
     */
    /** @property 
     */
    public Boolean get_Reverse()
    {
        return reverse;
    } //get_Reverse

    /** @property 
     */
    public void set_Reverse(Boolean value)
    {
        reverse = value;
    } //set_Reverse
} //YMLOperationBinding