| /******************************************************************************* |
| * Copyright (c) 2013 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: |
| * Sonatype, Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.aether.internal.impl; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.aether.ConfigurationProperties; |
| import org.eclipse.aether.RepositorySystemSession; |
| import org.eclipse.aether.util.ConfigUtils; |
| |
| /** |
| * Helps to sort pluggable components by their priority. |
| */ |
| final class PrioritizedComponents<T> |
| { |
| |
| private final static String FACTORY_SUFFIX = "Factory"; |
| |
| private final Map<?, ?> configProps; |
| |
| private final boolean useInsertionOrder; |
| |
| private final List<PrioritizedComponent<T>> components; |
| |
| private int firstDisabled; |
| |
| public PrioritizedComponents( RepositorySystemSession session ) |
| { |
| this( session.getConfigProperties() ); |
| } |
| |
| PrioritizedComponents( Map<?, ?> configurationProperties ) |
| { |
| configProps = configurationProperties; |
| useInsertionOrder = |
| ConfigUtils.getBoolean( configProps, ConfigurationProperties.DEFAULT_IMPLICIT_PRIORITIES, |
| ConfigurationProperties.IMPLICIT_PRIORITIES ); |
| components = new ArrayList<PrioritizedComponent<T>>(); |
| firstDisabled = 0; |
| } |
| |
| public void add( T component, float priority ) |
| { |
| Class<?> type = getImplClass( component ); |
| int index = components.size(); |
| priority = useInsertionOrder ? -index : ConfigUtils.getFloat( configProps, priority, getConfigKeys( type ) ); |
| PrioritizedComponent<T> pc = new PrioritizedComponent<T>( component, type, priority, index ); |
| |
| if ( !useInsertionOrder ) |
| { |
| index = Collections.binarySearch( components, pc ); |
| if ( index < 0 ) |
| { |
| index = -index - 1; |
| } |
| else |
| { |
| index++; |
| } |
| } |
| components.add( index, pc ); |
| |
| if ( index <= firstDisabled && !pc.isDisabled() ) |
| { |
| firstDisabled++; |
| } |
| } |
| |
| private static Class<?> getImplClass( Object component ) |
| { |
| Class<?> type = component.getClass(); |
| // detect and ignore CGLIB-based proxy classes employed by Guice for AOP (cf. BytecodeGen.newEnhancer) |
| int idx = type.getName().indexOf( "$$" ); |
| if ( idx >= 0 ) |
| { |
| Class<?> base = type.getSuperclass(); |
| if ( base != null && idx == base.getName().length() && type.getName().startsWith( base.getName() ) ) |
| { |
| type = base; |
| } |
| } |
| return type; |
| } |
| |
| static String[] getConfigKeys( Class<?> type ) |
| { |
| List<String> keys = new ArrayList<String>(); |
| keys.add( ConfigurationProperties.PREFIX_PRIORITY + type.getName() ); |
| String sn = type.getSimpleName(); |
| keys.add( ConfigurationProperties.PREFIX_PRIORITY + sn ); |
| if ( sn.endsWith( FACTORY_SUFFIX ) ) |
| { |
| keys.add( ConfigurationProperties.PREFIX_PRIORITY + sn.substring( 0, sn.length() - FACTORY_SUFFIX.length() ) ); |
| } |
| return keys.toArray( new String[keys.size()] ); |
| } |
| |
| public boolean isEmpty() |
| { |
| return components.isEmpty(); |
| } |
| |
| public List<PrioritizedComponent<T>> getAll() |
| { |
| return components; |
| } |
| |
| public List<PrioritizedComponent<T>> getEnabled() |
| { |
| return components.subList( 0, firstDisabled ); |
| } |
| |
| public void list( StringBuilder buffer ) |
| { |
| for ( int i = 0; i < components.size(); i++ ) |
| { |
| if ( i > 0 ) |
| { |
| buffer.append( ", " ); |
| } |
| PrioritizedComponent<?> component = components.get( i ); |
| buffer.append( component.getType().getSimpleName() ); |
| if ( component.isDisabled() ) |
| { |
| buffer.append( " (disabled)" ); |
| } |
| } |
| } |
| |
| @Override |
| public String toString() |
| { |
| return components.toString(); |
| } |
| |
| } |