Examples of org.apache.avalon.meta.info.DependencyDescriptor

org.apache.avalon.meta.info.DependencyDescriptor
A descriptor that describes dependency information for a particular Component. This class contains information about;
- role: the name component uses to look up dependency
- service: the class/interface that the dependency must provide
Also associated with each dependency is a set of arbitrary attributes that can be used to store extra information about dependency. See {@link InfoDescriptor} for exampleof how to declare the container specific attributes.

Possible uses for the attributes are to declare container specific constraints of component. For example a dependency on a Corba ORB may also require that the Corba ORB contain the TimeServer and PersistenceStateService at initialization. Or it may require that the componenet be multi-thread safe or that it is persistent etc. These are all container specific demands.
@author Avalon Development Team @version $Revision: 1.1.1.1 $ $Date: 2003/09/24 08:15:06 $

        final Version version = resolveVersion( versionString, value );
        final String key = getNamedParameter( tag, KEY_PARAM, type );
        final String optional = getNamedParameter( tag, OPTIONAL_PARAM, "false" );
        final boolean isOptional = "true".equals( optional.toLowerCase() );
        final ReferenceDescriptor ref = new ReferenceDescriptor( type, version );
        return new DependencyDescriptor( key, ref, isOptional, null );
    }

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    {
        final Configuration[] deps = depSet.getChildren( "dependency" );
        final ArrayList dependencies = new ArrayList();
        for( int i = 0; i < deps.length; i++ )
        {
            final DependencyDescriptor dependency = 
              buildBlockDependency( deps[ i ] );
            dependencies.add( dependency );
        }
        return (DependencyDescriptor[])dependencies.toArray( 
          new DependencyDescriptor[ 0 ] );

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              buildAttributes( dependency.getChild( "attributes" ) );
            String role = dependency.getChild( "role" ).getValue( null );


            // default to name of service if role unspecified
            if( null == role ) role = service.getClassname();
            return new DependencyDescriptor( role, service, optional, attributes );
        }
        catch( Throwable e )
        {
            final String error =
              "Error occured while attempting to build dependency descriptor from legacy blockinfo descriptor: "

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        }


        writer.write( "\n  <dependencies>" );
        for( int i = 0; i < dependencies.length; i++ )
        {
            final DependencyDescriptor dependency = dependencies[ i ];
            writer.write( "\n    <dependency " );


            if( !dependency.getKey().equals( dependency.getReference().getClassname() ) )
            {
                writer.write( "key=\"" );
                writer.write( dependency.getKey() );
                writer.write( "\" " );
            }


            writer.write( "type=\"" );
            writer.write( dependency.getReference().getClassname() );
            if( dependency.getReference().getVersion().getMajor() > -1 )
            {
                writer.write( "\" version=\"" );
                writer.write( dependency.getReference().getVersion().toString() );
            }


            if( dependency.isOptional() )
            {
                writer.write( "\" optional=\"true" );
            }


            final int count = dependency.getAttributeNames().length;
            if( 0 == count )
            {
                writer.write( "\"/>" );
            }
            else

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        final Configuration[] elements = configuration.getChildren( "dependency" );
        final ArrayList dependencies = new ArrayList();


        for( int i = 0; i < elements.length; i++ )
        {
            final DependencyDescriptor dependency =
                buildDependency( elements[ i ] );
            dependencies.add( dependency );
        }


        return (DependencyDescriptor[])dependencies.toArray( new DependencyDescriptor[ 0 ] );

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        if( null == role )
        {
            role = reference.getClassname();
        }


        return new DependencyDescriptor( role, reference, optional, attributes );
    }

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        super( name );
    }


    protected Descriptor getDescriptor()
    {
        return new DependencyDescriptor( m_role, m_reference, m_optional, getProperties() );
    }

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    protected void checkDescriptor( Descriptor desc )
    {
        super.checkDescriptor( desc );


        DependencyDescriptor dep = (DependencyDescriptor) desc;
        assertEquals( m_role, dep.getKey() );
        assertEquals( m_reference, dep.getReference() );
        assertEquals( m_optional, dep.isOptional() );
        assertEquals( !m_optional, dep.isRequired() );
    }

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