objecttype.java

Xfire文件 用于开发web service 的一个开源工具 很好用的

package org.codehaus.xfire.aegis.type.basic;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Collections;
import java.util.Set;
import javax.xml.namespace.QName;

import org.codehaus.xfire.MessageContext;
import org.codehaus.xfire.aegis.AegisBindingProvider;
import org.codehaus.xfire.aegis.MessageReader;
import org.codehaus.xfire.aegis.MessageWriter;
import org.codehaus.xfire.aegis.type.Type;
import org.codehaus.xfire.aegis.type.TypeMapping;
import org.codehaus.xfire.fault.XFireFault;
import org.codehaus.xfire.soap.SoapConstants;
import org.codehaus.xfire.util.Base64;
import org.jdom.Attribute;
import org.jdom.Element;
import org.w3c.dom.Document;

/**
 * Type for runtime inspection of types. Looks as the class to be written, and looks to see if there is a type for that
 * class. If there is, it writes out the value and inserts a <em>xsi:type</em> attribute to signal what the type of the
 * value is.
 *
 * Can specify an optional set of dependent <code>Type</code>'s in the constructor, in the case that the type is a
 * custom type that may not have its schema in the WSDL.
 *
 * Can specify whether or not unknown objects should be serialized as a byte stream.
 *
 * @author <a href="mailto:[e-mail]">peter royal</a>
 */
public class ObjectType extends Type
{
    private static final QName XSI_TYPE = new QName( SoapConstants.XSI_NS, "type" );
    private static final QName XSI_NIL = new QName( SoapConstants.XSI_NS, "nil" );

    private Set dependencies;
    private boolean serializedWhenUnknown;
    private boolean readToDocument = false;
    
    public ObjectType()
    {
        this( Collections.EMPTY_SET );
        readToDocument = true;
    }

    public ObjectType( Set dependencies )
    {
        this( dependencies, false );
    }

    public ObjectType( boolean serializeWhenUnknown )
    {
        this( Collections.EMPTY_SET, serializeWhenUnknown );
    }

    public ObjectType( Set dependencies, boolean serializeWhenUnknown )
    {
        this.dependencies = dependencies;
        this.serializedWhenUnknown = serializeWhenUnknown;
    }

    public Object readObject( MessageReader reader, MessageContext context ) throws XFireFault
    {
        if( isNil( reader.getAttributeReader( XSI_NIL ) ) )
        {
			while( reader.hasMoreElementReaders() ) {
                reader.getNextElementReader();
            }

            return null;
        }

        MessageReader typeReader = reader.getAttributeReader( XSI_TYPE );

        if( null == typeReader && !readToDocument )
        {
            throw new XFireFault( "Missing 'xsi:type' attribute", XFireFault.SENDER );
        }

        String typeName = typeReader.getValue();

        if( null == typeName  && !readToDocument )
        {
            throw new XFireFault( "Missing 'xsi:type' attribute value", XFireFault.SENDER);
        }

        Type type = null;
		QName typeQName = null;
		if (typeName != null)
        {
            typeQName = extractQName(reader, typeName);
        } 
        else 
        {
            typeQName = reader.getName();
        }

        TypeMapping tm = (TypeMapping) context.getService().getProperty(AegisBindingProvider.TYPE_MAPPING_KEY);
        if (tm == null) 
        {
            tm = getTypeMapping();
        }
        
        type = tm.getType( typeQName );
        
        if (type == null) 
        {
            type = tm.getType(getSchemaType());
        }

        if (type == null && readToDocument)
		{
			type = getTypeMapping().getType(Document.class);
		}

        if( null == type )
        {
            //TODO should check namespace as well..
            if( serializedWhenUnknown && "serializedJavaObject".equals( typeName ) )
            {
                return reconstituteJavaObject( reader );
            }

            throw new XFireFault( "No mapped type for '" + typeName + "' (" + typeQName + ")", XFireFault.SENDER);
        }

        return type.readObject( reader, context );
    }

    private QName extractQName( MessageReader reader, String typeName )
    {
        int colon = typeName.indexOf( ':' );

        if( -1 == colon )
        {
            return new QName( reader.getNamespace(), typeName );
        }
        else
        {
            return new QName( reader.getNamespaceForPrefix( typeName.substring( 0, colon ) ),
                              typeName.substring( colon + 1 ) );
        }
    }

    private Object reconstituteJavaObject( MessageReader reader ) throws XFireFault
    {
        ByteArrayInputStream in = new ByteArrayInputStream( Base64.decode( reader.getValue() ) );

        try
        {
            return new ObjectInputStream( in ).readObject();
        }
        catch( Exception e )
        {
            throw new XFireFault( "Unable to reconstitute serialized object", e, XFireFault.RECEIVER );
        }
    }

    private boolean isNil( MessageReader reader )
    {
        return null != reader && "true".equals( reader.getValue() );
    }

    public void writeObject( Object object, MessageWriter writer, MessageContext context ) throws XFireFault
    {
        if( null == object )
        {
            MessageWriter nilWriter = writer.getAttributeWriter( XSI_NIL );

            nilWriter.writeValue( "true" );

            nilWriter.close();
        }
        else
        {
            Type type = determineType( context, object.getClass() );

            if( null == type )
            {
            	TypeMapping tm = (TypeMapping) context.getService().getProperty(AegisBindingProvider.TYPE_MAPPING_KEY);
                if (tm == null) 
                {
                    tm = getTypeMapping();
                }
                
            	type = tm.getTypeCreator().createType(object.getClass());
                tm.register(type);
            }
            
            String prefix = writer.getPrefixForNamespace( type.getSchemaType().getNamespaceURI() );

            if( null == prefix || prefix.length() == 0 )
            {
                addXsiType( writer, type.getSchemaType().getLocalPart() );
            }
            else
            {
                addXsiType( writer, prefix + ":" + type.getSchemaType().getLocalPart() );
            }

            type.writeObject( object, writer, context );
        }
    }

    private Type determineType( MessageContext context, Class clazz )
    {
        TypeMapping tm = (TypeMapping) context.getService().getProperty(AegisBindingProvider.TYPE_MAPPING_KEY);
        if (tm == null) 
        {
            tm = getTypeMapping();
        }
        Type type = tm.getType( clazz );

        if (null != type) 
        {
            return type;
        }

        Class[] interfaces = clazz.getInterfaces();

        for( int i = 0; i < interfaces.length; i++ )
        {
            Class anInterface = interfaces[i];

            type = tm.getType( anInterface );

            if( null != type ) {
                return type;
            }
        }

        Class superclass = clazz.getSuperclass();

        if( null == superclass || Object.class.equals( superclass)) {
            return null;
        }

        return determineType( context, superclass );
    }

    private void addXsiType( MessageWriter writer, String prefixedType )
    {
        MessageWriter typeWriter = writer.getAttributeWriter( XSI_TYPE );

        typeWriter.writeValue( prefixedType );

        typeWriter.close();
    }

    private void handleNullType( Object object, MessageWriter writer ) throws XFireFault
    {
        if( !serializedWhenUnknown )
        {
            throw new XFireFault( "Unable to write '" + object + "' [" + object.getClass().getName() + "]. Type is unknown.",
                                  XFireFault.RECEIVER );
        }

        addXsiType( writer,
                    "serializedJavaObject" ); //TODO not sure what namespace to put here..should match what is put in writeSchema

        ByteArrayOutputStream out = new ByteArrayOutputStream( 4096 );

        try
        {
            ObjectOutputStream objectOutputStream = new ObjectOutputStream( out );

            objectOutputStream.writeObject( object );
            objectOutputStream.close();
        }
        catch( IOException e )
        {
            throw new XFireFault( "Unable to serialize '" + object + "' [" + object.getClass().getName() + "]",
                                  e,
                                  XFireFault.RECEIVER );
        }

        writer.writeValue( Base64.encode( out.toByteArray() ) );
    }

    public boolean isReadToDocument()
    {
        return readToDocument;
    }

    public void setReadToDocument(boolean readToDocument)
    {
        this.readToDocument = readToDocument;
    }

    public boolean isSerializedWhenUnknown()
    {
        return serializedWhenUnknown;
    }

    public void setSerializedWhenUnknown(boolean serializedWhenUnknown)
    {
        this.serializedWhenUnknown = serializedWhenUnknown;
    }

    public void setDependencies(Set dependencies)
    {
        this.dependencies = dependencies;
    }

    public Set getDependencies()
    {
        return dependencies;
    }

    public boolean isComplex()
    {
        return true;
    }

    public boolean isAbstract()
    {
        // TODO Auto-generated method stub
        return super.isAbstract();
    }

    public boolean isNillable()
    {
        // TODO Auto-generated method stub
        return super.isNillable();
    }

    public boolean isWriteOuter()
    {
        // TODO Auto-generated method stub
        return super.isWriteOuter();
    }

    public void setNillable(boolean nillable)
    {
        // TODO Auto-generated method stub
        super.setNillable(nillable);
    }

    public void writeSchema( Element root )
    {
        if( serializedWhenUnknown )
        {
            Element simple = new Element( "simpleType", SoapConstants.XSD_PREFIX, SoapConstants.XSD );
            simple.setAttribute( new Attribute( "name", "serializedJavaObject" ) );
            root.addContent( simple );

            Element restriction = new Element( "restriction", SoapConstants.XSD_PREFIX, SoapConstants.XSD );
            restriction.setAttribute( new Attribute( "base", SoapConstants.XSD_PREFIX + ":base64Binary" ) );

            simple.addContent( restriction );
        }
    }
}