DPML Notify

[mcconnell AT dpml.net]

Author: mcconnell AT dpml.net
Date: Fri Mar 25 12:46:20 2005
New Revision: 2131

Added:
   
development/main/metro/composition/api/src/main/net/dpml/composition/data/ValueDirective.java
   
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/PartDataType.java
   
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/ValueDataType.java
Modified:
   
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/TypeBuilderTask.java
   
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/PartsDataType.java
   development/main/metro/composition/testing/acme/build.xml
   
development/main/metro/composition/testing/acme/src/main/net/dpml/composition/testing/DefaultWidget.java
Log:
Add clean implementation of valuetype part.

Added: 
development/main/metro/composition/api/src/main/net/dpml/composition/data/ValueDirective.java
==============================================================================
--- (empty file)
+++ 
development/main/metro/composition/api/src/main/net/dpml/composition/data/ValueDirective.java
       Fri Mar 25 12:46:20 2005
@@ -0,0 +1,324 @@
+/*
+ * Copyright 2004 Stephen J. McConnell.
+ *
+ * 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.
+ */
+
+package net.dpml.composition.data;
+
+import java.io.Serializable;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import net.dpml.lang.NullArgumentException;
+
+import net.dpml.part.Part;
+
+/**
+ * A <code>Value</code> represents a single constructor typed argument 
value. The directive
+ * container a classname (default value of <code>java.lang.String</code>) 
and possible sub-directives.
+ * The directives value is established by creating a new instance using the 
classname
+ * together with the values directived from the sub-sidiary directives as 
constructor arguments.
+ *
+ * <p><b>XML</b></p>
+ * <p>A value is a nested structure containing a string value or contructor 
parameter arguments.</p>
+ * <pre>
+ *    <font color="gray">&lt;-- Simple string param declaration --&gt;</font>
+ *
+ *    &lt;value&gt;<font color="darkred">London</font>&lt;/value&gt;
+ *
+ *    <font color="gray">&lt;-- Typed value declaration --&gt;</font>
+ *
+ *    &lt;value class="<font color="darkred">java.io.File</font>"&gt;<font 
color="darkred">./home</font>&lt;/value&gt;
+ *
+ *    <font color="gray">&lt;-- Multi-argument parameter declaration 
--&gt;</font>
+ *
+ *    &lt;value class="<font color="darkred">MyClass</font>"&gt;
+ *       &lt;value class="<font color="darkred">java.io.File</font>"><font 
color="darkred">./home</font>&lt;/value&gt;
+ *       &lt;value&gt;<font color="darkred">London</font>&lt;/value&gt;
+ *    &lt;/value&gt;
+ * </pre>
+ *
+ * @author <a href="mailto:dev-dpml AT lists.ibiblio.org";>The Digital Product 
Meta Library</a>
+ * @version $Id: Parameter.java 2119 2005-03-23 02:04:46Z mcconnell AT dpml.net 
$
+ */
+public class ValueDirective implements Serializable, Part
+{
+    
//--------------------------------------------------------------------------
+    // state
+    
//--------------------------------------------------------------------------
+
+    private final String m_key;
+    private final String m_classname;
+    private final String m_value;
+    private final Value[] m_values;
+
+    
//--------------------------------------------------------------------------
+    // constructors
+    
//--------------------------------------------------------------------------
+
+    public ValueDirective( String key, String classname, String value )
+    {
+        m_key = key;
+        m_classname = classname;
+        m_value = value;
+        m_values = new Value[0];
+    }
+
+    public ValueDirective( String key, String classname, Value[] values )
+    {
+        m_key = key;
+        m_classname = classname;
+        m_value = null;
+        m_values = values;
+    }
+
+    
//--------------------------------------------------------------------------
+    // ValueDirective
+    
//--------------------------------------------------------------------------
+
+    public String getKey()
+    {
+        return m_key;
+    }
+
+    public String getClassname()
+    {
+        return m_classname;
+    }
+
+    public String getValue()
+    {
+        return m_value;
+    }
+
+    public Value[] getValues()
+    {
+        return m_values;
+    }
+
+    
//--------------------------------------------------------------------------
+    // Part
+    
//--------------------------------------------------------------------------
+
+    /**
+     * Return the part handler uri.
+     * @return the uri of the part handler
+     */
+     public URI getPartHandlerURI()
+     {
+         return PART_HANDLER_URI;
+     }
+
+    
//--------------------------------------------------------------------------
+    // static utils
+    
//--------------------------------------------------------------------------
+
+    public static class Value implements Serializable
+    {
+        /**
+         * The classname to use as the parameter implementation class 
(defaults to java.lang.String)
+         */
+        private final String m_classname;
+    
+        /**
+         * The supplied argument.
+         */
+        private String m_argument;
+    
+        /**
+         * The sub-directives from which the value for this value directive 
may be derived.
+         */
+        private final Value[] m_children;
+
+        /**
+         * Creation of a new value directive using the default 
<code>java.lang.String</code>
+         * type and a supplied value.
+         *
+         * @param value the string value
+         */
+        public Value( final String value )
+        {
+            m_classname = "java.lang.String";
+            m_children = new Value[ 0 ];
+            m_argument = value;
+        }
+
+        /**
+         * Creation of a new entry directive using a supplied classname and 
value.
+         * @param classname the classname of the value
+         * @param value the value constructor value
+         * @exception NullArgumentException if the classname argument is 
null.
+         */
+        public Value( final String classname, final String value )
+            throws NullArgumentException
+        {
+            if( null == classname )
+            {
+                throw new NullArgumentException( "classname" );
+            }
+    
+            m_classname = classname;
+            m_children = new Value[ 0 ];
+            m_argument = value;
+        }
+
+        /**
+         * Creation of a new entry directive.
+         * @param classname the classname of the entry implementation
+         * @param children implementation class constructor directives
+         * @exception NullArgumentException if either the classname argument 
or the
+         *           children argument is null, or any of the elements in the
+         *           children array is null.
+         */
+        public Value( final String classname, final Value[] children )
+            throws NullArgumentException
+        {
+            if( null == classname )
+            {
+                throw new NullArgumentException( "classname" );
+            }
+            if( null == children )
+            {
+                throw new NullArgumentException( "children" );
+            }
+            for( int i = 0; i < children.length; i++ )
+            {
+                if( children[ i ] == null )
+                {
+                    throw new NullArgumentException( "child [" + i + "]" );
+                }
+            }
+            m_classname = classname;
+            m_children = children;
+        }
+    
+        /**
+         * Return the classname of the parameter implementation to use.
+         * @return the classname
+         */
+        public String getClassname()
+        {
+            return m_classname;
+        }
+
+        /**
+         * Return the argument (may be null).
+         */
+        public String getArgument()
+        {
+            return m_argument;
+        }
+    
+        /**
+         * Return the constructor descriptors for this value descriptor.
+         */
+        public Value[] getValueDirectives()
+        {
+            return m_children;
+        }
+    
+       /**
+        * Test if the supplied object is equal to this object.
+        * @param other the object to compare with this instance
+        * @return TRUE if the supplied object is equal to this object
+        */
+        public boolean equals( Object other )
+        {
+            if( null == other )
+            {
+                return false;
+            }
+            else
+            {
+                if( other instanceof Value )
+                {
+                    Value param = (Value) other;
+                    if( false == m_classname.equals( param.getClassname() ) )
+                    {
+                        return false;
+                    }
+                    if( null == m_argument )
+                    {
+                        if( null != param.getArgument() )
+                        {
+                            return false;
+                        }
+                    }
+                    else if( false == m_argument.equals( param.getArgument() 
) )
+                    {
+                        return false;
+                    }
+                    if( getValueDirectives().length != 
param.getValueDirectives().length )
+                    {
+                        return false;
+                    }
+                    else
+                    {
+                        Value[] myParams = getValueDirectives();
+                        Value[] yourParams = param.getValueDirectives();
+                            for( int i=0; i<myParams.length; i++ )
+                        {
+                            Value p = myParams[i];
+                            Value q = yourParams[i];
+                            if( false == p.equals( q ) )
+                            {
+                                return false;
+                            }
+                        }
+                        return true;
+                    }
+                }
+                else
+                {
+                    return false;
+                }
+            }
+        }
+    
+       /**
+        * Return the hashcode for the instance.
+        * @return the instance hashcode
+        */
+        public int hashCode()
+        {
+            int hash = m_classname.hashCode();
+            if( null != m_argument )
+            {
+                hash ^= m_argument.hashCode();
+            }
+            for( int i=0; i<m_children.length; i++ )
+            {
+                hash ^= m_children[i].hashCode();
+            }
+            return hash;
+        }
+    }
+
+    private static URI PART_HANDLER_URI = setupURI( "@PART-HANDLER-URI@" );
+    private static URI PART_BUILDER_URI = setupURI( "@PART-BUILDER-URI@" );
+
+    protected static URI setupURI( String spec )
+    {
+        try
+        {
+            return new URI( spec );
+        }
+        catch( URISyntaxException ioe )
+        {
+            return null;
+        }
+    }
+}

Modified: 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/TypeBuilderTask.java
==============================================================================
--- 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/TypeBuilderTask.java
       (original)
+++ 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/TypeBuilderTask.java
       Fri Mar 25 12:46:20 2005
@@ -26,7 +26,10 @@
 import java.util.List;
 import java.util.LinkedList;
 import java.util.ArrayList;
+import java.util.Properties;
 import java.lang.reflect.Method;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
 import java.net.URI;
 
 import net.dpml.meta.info.Type;
@@ -170,9 +173,10 @@
         catch( IntrospectionException e )
         {
             final String error = 
-              "Internal error while attempting to construct type  ["
+              "Introdspection error while attempting to construct type  ["
               + m_classname 
-              + "]";
+              + "]. "
+              + e.getMessage();
             throw new BuildException( error, e, getLocation() );
         }
     }
@@ -216,13 +220,240 @@
         return m_classname;
     }
 
-    private InfoDescriptor createInfoDescriptor( Class subject )
+    private InfoDescriptor createInfoDescriptor( Class subject ) throws 
IntrospectionException
     {
-        String classname = subject.getName();
         String name = getName();
-        return new InfoDescriptor( name, classname );
+        String classname = subject.getName();
+        boolean threadsafe = getThreadSafeCapability( subject );
+        int lifestylePreference = getLifestylePreference( subject );
+        String lifestyle = InfoDescriptor.getLifestylePreferenceKey( 
lifestylePreference );
+        int collectionPolicy = getCollectionPolicyPreference( subject );
+        String collection = InfoDescriptor.getCollectionPolicyKey( 
collectionPolicy );
+        String schema = getConfigurationSchema( subject );
+        Properties properties = getTypeProperties( subject );
+        return new InfoDescriptor( 
+          name, classname, null, lifestyle, collection, schema, threadsafe, 
true, properties );
+    }
+
+    private boolean getThreadSafeCapability( Class subject ) throws 
IntrospectionException
+    {
+        try
+        {
+            Field field = subject.getDeclaredField( 
"TYPE_THREADSAFE_CAPABLE" );
+            if( field.getModifiers() == Modifier.STATIC )
+            {
+                return field.getBoolean( null );
+            }
+            else
+            {
+                return false;
+            }
+        }
+        catch( NoSuchFieldException e )
+        {
+            return false;
+        }
+        catch( IllegalArgumentException e )
+        {
+            final String error =
+              "The component type [" 
+              + subject.getName()
+              + "] declares an invalid static field TYPE_THREADSAFE_POLICY 
declaration. "
+              + "Could not convert the value to a boolean.";
+            throw new IntrospectionException( error );
+        }
+        catch( Exception e )
+        {
+            final String error =
+              "An unexpected error occured while resolving the static 
TYPE_THREADSAFE_POLICY field on the type [" 
+              + subject.getName()
+              + "].";
+            throw new IntrospectionException( error );
+        }
+
+    }
+
+    private int getLifestylePreference( Class subject ) throws 
IntrospectionException
+    {
+        try
+        {
+            Field field = subject.getDeclaredField( 
"TYPE_LIFESTYLE_PREFERENCE" );
+            if( field.getModifiers() == Modifier.STATIC )
+            {
+                return field.getInt( null );
+            }
+            else
+            {
+                return InfoDescriptor.TRANSIENT_LIFESTYLE;
+            }
+        }
+        catch( NoSuchFieldException e )
+        {
+            return InfoDescriptor.TRANSIENT_LIFESTYLE;
+        }
+        catch( IllegalArgumentException e )
+        {
+            final String error =
+              "The component type [" 
+              + subject.getName()
+              + "] declares an invalid static field 
TYPE_LIFESTYLE_PREFERENCE declaration. "
+              + "Could not convert the value to an int.";
+            throw new IntrospectionException( error );
+        }
+        catch( Exception e )
+        {
+            final String error =
+              "An unexpected error occured while resolving the static 
TYPE_LIFESTYLE_PREFERENCE field on the type [" 
+              + subject.getName()
+              + "].";
+            throw new IntrospectionException( error );
+        }
+    }
+
+    private int getCollectionPolicyPreference( Class subject ) throws 
IntrospectionException
+    {
+        try
+        {
+            Field field = subject.getDeclaredField( 
"TYPE_COLLECTION_PREFERENCE" );
+            if( field.getModifiers() == Modifier.STATIC )
+            {
+                return field.getInt( null );
+            }
+            else
+            {
+                return InfoDescriptor.UNDEFINED;
+            }
+        }
+        catch( NoSuchFieldException e )
+        {
+            return InfoDescriptor.UNDEFINED;
+        }
+        catch( IllegalArgumentException e )
+        {
+            final String error =
+              "The component type [" 
+              + subject.getName()
+              + "] declares an invalid static field 
TYPE_COLLECTION_PREFERENCE declaration. "
+              + "Could not convert the value to an int.";
+            throw new IntrospectionException( error );
+        }
+        catch( Exception e )
+        {
+            final String error =
+              "An unexpected error occured while resolving the static 
TYPE_COLLECTION_PREFERENCE field on the type [" 
+              + subject.getName()
+              + "].";
+            throw new IntrospectionException( error );
+        }
     }
 
+    private String getConfigurationSchema( Class subject ) throws 
IntrospectionException
+    {
+        try
+        {
+            Field field = subject.getDeclaredField( 
"TYPE_CONFIGURATION_SCHEMA" );
+            if( field.getModifiers() == Modifier.STATIC )
+            {
+                if( String.class.isAssignableFrom( field.getType() ) )
+                {
+                    return (String) field.get( null );
+                }
+                else
+                {
+                    final String error =
+                      "The component type [" 
+                      + subject.getName()
+                      + "] declares an invalid static field 
TYPE_CONFIGURATION_SCHEMA declaration. "
+                      + "The declared type is not assignable to a string.";
+                    throw new IntrospectionException( error );
+                }
+            }
+            else
+            {
+                return null;
+            }
+        }
+        catch( NoSuchFieldException e )
+        {
+            return null;
+        }
+        catch( IllegalArgumentException e )
+        {
+            final String error =
+              "The component type [" 
+              + subject.getName()
+              + "] declares an invalid static field 
TYPE_CONFIGURATION_SCHEMA declaration. "
+              + "Could not convert the value to an string.";
+            throw new IntrospectionException( error );
+        }
+        catch( IntrospectionException e )
+        {
+            throw e;
+        }
+        catch( Exception e )
+        {
+            final String error =
+              "An unexpected error occured while resolving the static 
TYPE_CONFIGURATION_SCHEMA field on the type [" 
+              + subject.getName()
+              + "].";
+            throw new IntrospectionException( error );
+        }
+    }
+
+    private Properties getTypeProperties( Class subject ) throws 
IntrospectionException
+    {
+        try
+        {
+            Field field = subject.getDeclaredField( "TYPE_INFO_PROPERTIES" );
+            if( field.getModifiers() == Modifier.STATIC )
+            {
+                if( Properties.class.isAssignableFrom( field.getType() ) )
+                {
+                    return (Properties) field.get( null );
+                }
+                else
+                {
+                    final String error =
+                      "The component type [" 
+                      + subject.getName()
+                      + "] declares an invalid static field 
TYPE_INFO_PROPERTIES declaration. "
+                      + "The declared type is not assignable to a 
java.util.Properties value.";
+                    throw new IntrospectionException( error );
+                }
+            }
+            else
+            {
+                return null;
+            }
+        }
+        catch( NoSuchFieldException e )
+        {
+            return null;
+        }
+        catch( IllegalArgumentException e )
+        {
+            final String error =
+              "The component type [" 
+              + subject.getName()
+              + "] declares an invalid static field TYPE_INFO_PROPERTIES 
declaration. "
+              + "Could not convert the value to an instance of 
java.util.Properties.";
+            throw new IntrospectionException( error );
+        }
+        catch( IntrospectionException e )
+        {
+            throw e;
+        }
+        catch( Exception e )
+        {
+            final String error =
+              "An unexpected error occured while resolving the static 
TYPE_INFO_PROPERTIES field on the type [" 
+              + subject.getName()
+              + "].";
+            throw new IntrospectionException( error );
+        }
+    }
+
+
    /**
     * If the class contains an inner class named "Dependencies" then
     * resolve the key/inteterface clasname pairs based on the inner class

Added: 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/PartDataType.java
==============================================================================
--- (empty file)
+++ 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/PartDataType.java
        Fri Mar 25 12:46:20 2005
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2005 Stephen J. McConnell
+ *
+ * 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.
+ */
+
+package net.dpml.composition.builder.datatypes;
+
+import java.util.List;
+import java.util.LinkedList;
+import java.util.ArrayList;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import net.dpml.part.Part;
+
+import net.dpml.builder.PartBuilder;
+
+import net.dpml.composition.data.ValueDirective;
+import net.dpml.composition.data.ValueDirective.Value;
+
+/**
+ * A simple part datatype.
+ */
+public class PartDataType extends ValueDataType implements PartBuilder
+{
+    private String m_key;
+
+   /**
+    * Set the key that this directive qualifies.
+    * @param key the context entry key
+    */
+    public void setKey( final String key )
+    {
+        m_key = key ;
+    }
+
+    //---------------------------------------------------------------------
+    // Builder
+    //---------------------------------------------------------------------
+
+   /**
+    * Return a uri identitifying the builder.
+    *
+    * @return the builder uri
+    */
+    public URI getBuilderURI()
+    {
+        return PART_BUILDER_URI;
+    }
+
+    //---------------------------------------------------------------------
+    // PartBuilder
+    //---------------------------------------------------------------------
+
+    public Part buildPart( ClassLoader classloader )
+    {
+        return getValueDirective( classloader );
+    }
+
+   /**
+    * Return the key identifying the part that this builder is building.
+    */
+    public String getKey()
+    {
+        return m_key;
+    }
+
+   /**
+    * Return a urn identitifying the part handler for this builder.
+    *
+    * @return a strategy uri
+    */
+    public URI getPartHandlerURI()
+    {
+        return PART_HANDLER_URI;
+    }
+
+    //---------------------------------------------------------------------
+    // implementation
+    //---------------------------------------------------------------------
+
+    public ValueDirective getValueDirective( ClassLoader classloader )
+    {
+        String key = getKey();
+        String classname = getClassname();
+        String value = getValue();
+        if( null != value )
+        {  
+            return new ValueDirective( key, classname, value );
+        }
+        else
+        {
+            ValueDataType[] params = getValueDataTypes();
+            Value[] values = new Value[ params.length ];
+            for( int i=0; i<params.length; i++ )
+            {
+                 ValueDataType p = params[i];
+                 values[i] = p.constructValue();
+            }
+            return new ValueDirective( key, classname, values );
+        }
+    }
+
+    //---------------------------------------------------------------------
+    // static utilities
+    //---------------------------------------------------------------------
+
+    private static URI PART_HANDLER_URI = setupURI( "@PART-HANDLER-URI@" );
+    private static URI PART_BUILDER_URI = setupURI( "@PART-BUILDER-URI@" );
+
+    protected static URI setupURI( String spec )
+    {
+        try
+        {
+            return new URI( spec );
+        }
+        catch( URISyntaxException ioe )
+        {
+            return null;
+        }
+    }
+
+}
+

Modified: 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/PartsDataType.java
==============================================================================
--- 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/PartsDataType.java
       (original)
+++ 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/PartsDataType.java
       Fri Mar 25 12:46:20 2005
@@ -63,6 +63,17 @@
     }
 
    /**
+    * Create a new constructed part builder.
+    * @return a part builder
+    */
+    public PartDataType createValue()
+    {
+        final PartDataType builder = new PartDataType();
+        m_builders.add( builder );
+        return builder;
+    }
+
+   /**
     * Operation used to construct a custom part type directive.
     * @param uri the part handler uri
     * @param name the element name

Added: 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/ValueDataType.java
==============================================================================
--- (empty file)
+++ 
development/main/metro/composition/builder/src/main/net/dpml/composition/builder/datatypes/ValueDataType.java
       Fri Mar 25 12:46:20 2005
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2005 Stephen J. McConnell
+ *
+ * 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.
+ */
+
+package net.dpml.composition.builder.datatypes;
+
+import java.util.List;
+import java.util.LinkedList;
+import java.util.ArrayList;
+
+import net.dpml.composition.data.ValueDirective.Value;
+
+
+/**
+ * Defintion of a context entry parameter directive.
+ */
+public class ValueDataType
+{
+     private String m_classname;
+     private String m_value;
+     private List m_params = new ArrayList();
+
+   /**
+    * Set the context entry classname.
+    * @param classname the context entry classname
+    */
+    public void setClass( final String classname )
+    {
+        m_classname = classname;
+    }
+
+   /**
+    * Return the context entry parameter classname.
+    * @return the classname
+    */
+    public String getClassname()
+    {
+        return m_classname;
+    }
+
+   /**
+    * Set the value of the context entry parameter.
+    * @param value the param value
+    */
+    public void setValue( final String value )
+    {
+        m_value = value;
+    }
+
+   /**
+    * Return the value of the context entry param.
+    * @return the value
+    */
+    public String getValue()
+    {
+        return m_value;
+    }
+
+   /**
+    * Create, assign and return a new nested entry constructor parameter.
+    * @return the new context entry param
+    */
+    public ValueDataType createValue()
+    {
+        final ValueDataType param = new ValueDataType();
+        m_params.add( param );
+        return param;
+    }
+
+   /**
+    * Return the set of nested param directives.
+    * @return the params
+    */
+    public ValueDataType[] getValueDataTypes()
+    {
+        return (ValueDataType[]) m_params.toArray( new ValueDataType[0] );
+    }
+
+    public Value constructValue()
+    {
+        String classname = getClassname();
+        String value = getValue();
+        if( null != value )
+        {  
+            return new Value( classname, value );
+        }
+        else
+        {
+            ValueDataType[] params = getValueDataTypes();
+            Value[] values = new Value[ params.length ];
+            for( int i=0; i<values.length; i++ )
+            {
+                ValueDataType p = params[i];
+                values[i] = p.constructValue();
+            }
+            return new Value( classname, values );
+        }
+    }
+}

Modified: development/main/metro/composition/testing/acme/build.xml
==============================================================================
--- development/main/metro/composition/testing/acme/build.xml   (original)
+++ development/main/metro/composition/testing/acme/build.xml   Fri Mar 25 
12:46:20 2005
@@ -25,7 +25,10 @@
           <dependency key="widget" source="widget"/>
         </dependencies>
         <parts>
-          <component name="secret" 
class="net.dpml.composition.testing.DefaultWidget"/>
+          <value key="foo" value="bar"/>
+          <value key="date" class="java.util.Date"/>
+          <value key="info" class="java.net.URI" 
value="link:acme/parts/acme-parts-list"/>
+          <component key="widget" name="secret" 
class="net.dpml.composition.testing.DefaultWidget"/>
         </parts>
       </component>
     </container>

Modified: 
development/main/metro/composition/testing/acme/src/main/net/dpml/composition/testing/DefaultWidget.java
==============================================================================
--- 
development/main/metro/composition/testing/acme/src/main/net/dpml/composition/testing/DefaultWidget.java
    (original)
+++ 
development/main/metro/composition/testing/acme/src/main/net/dpml/composition/testing/DefaultWidget.java
    Fri Mar 25 12:46:20 2005
@@ -28,6 +28,12 @@
 public class DefaultWidget implements Widget
 {
     //------------------------------------------------------------------
+    // static
+    //------------------------------------------------------------------
+
+    public static final boolean TYPE_THREADSAFE_CAPABLE = true;
+
+    //------------------------------------------------------------------
     // state
     //------------------------------------------------------------------