/*******************************************************************************
* Copyright (c) 2010-present Sonatype, Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Stuart McCulloch (Sonatype, Inc.) - initial API and implementation
*******************************************************************************/
package org.eclipse.sisu.plexus;
import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.List;
import org.codehaus.plexus.component.annotations.Requirement;
import org.eclipse.sisu.inject.DeferredClass;
import org.eclipse.sisu.space.LoadedClass;
/**
* Runtime implementation of Plexus @{@link Requirement} annotation.
*/
public final class RequirementImpl
implements Requirement
{
// ----------------------------------------------------------------------
// Implementation fields
// ----------------------------------------------------------------------
private final DeferredClass<?> role;
private final boolean optional;
private final String hint;
private final String[] hints;
// ----------------------------------------------------------------------
// Constructors
// ----------------------------------------------------------------------
public RequirementImpl( final DeferredClass<?> role, final boolean optional, final List<String> hints )
{
if ( null == role || null == hints || hints.contains( null ) )
{
throw new IllegalArgumentException( "@Requirement cannot contain null values" );
}
this.role = role;
this.optional = optional;
final int length = hints.size();
if ( length == 0 )
{
hint = "";
this.hints = Hints.NO_HINTS;
}
else if ( length == 1 )
{
hint = hints.get( 0 );
this.hints = Hints.NO_HINTS;
}
else
{
hint = "";
this.hints = hints.toArray( new String[length] );
}
}
/**
* For testing purposes only.
*/
@Deprecated
public RequirementImpl( final Class<?> role, final boolean optional, final String... hints )
{
this( new LoadedClass<Object>( role ), optional, Arrays.asList( hints ) );
}
// ----------------------------------------------------------------------
// Annotation properties
// ----------------------------------------------------------------------
public Class<?> role()
{
return role.load();
}
public boolean optional()
{
return optional;
}
public String hint()
{
return hint;
}
public String[] hints()
{
return hints.clone();
}
// ----------------------------------------------------------------------
// Standard annotation behaviour
// ----------------------------------------------------------------------
@Override
public boolean equals( final Object rhs )
{
if ( this == rhs )
{
return true;
}
if ( rhs instanceof Requirement )
{
final Requirement req = (Requirement) rhs;
return role().equals( req.role() ) && optional == req.optional() && hint.equals( req.hint() )
&& Arrays.equals( hints, req.hints() );
}
return false;
}
@Override
public int hashCode()
{
return ( 127 * "role".hashCode() ^ role().hashCode() )
+ ( 127 * "optional".hashCode() ^ Boolean.valueOf( optional ).hashCode() )
+ ( 127 * "hint".hashCode() ^ hint.hashCode() ) + ( 127 * "hints".hashCode() ^ Arrays.hashCode( hints ) );
}
@Override
public String toString()
{
return String.format( "@%s(hints=%s, optional=%b, role=%s, hint=%s)", Requirement.class.getName(),
Arrays.toString( hints ), Boolean.valueOf( optional ), role(), hint );
}
public Class<? extends Annotation> annotationType()
{
return Requirement.class;
}
}