001/*****************************************************************************
002 * Copyright (C) PicoContainer Organization. All rights reserved.            *
003 * ------------------------------------------------------------------------- *
004 * The software in this package is published under the terms of the BSD      *
005 * style license a copy of which has been included with this distribution in *
006 * the LICENSE.txt file.                                                     *
007 *                                                                           *
008 * Original code by                                                          *
009 *****************************************************************************/
010package org.picocontainer.injectors;
011
012import org.picocontainer.ComponentAdapter;
013import org.picocontainer.ComponentMonitor;
014import org.picocontainer.LifecycleStrategy;
015import org.picocontainer.Parameter;
016import org.picocontainer.PicoCompositionException;
017import static org.picocontainer.Characteristics.immutable;
018
019import java.util.Properties;
020
021/**
022 * A {@link org.picocontainer.InjectionFactory} for named fields.
023 *
024 * Use like so: pico.as(injectionFieldNames("field1", "field2")).addComponent(...)
025 *
026 * The factory creates {@link org.picocontainer.injectors.NamedFieldInjector}.
027 *
028 * @author Paul Hammant
029 */
030@SuppressWarnings("serial")
031public class NamedFieldInjection extends AbstractInjectionFactory {
032
033
034    private static final String INJECTION_FIELD_NAMES = "injectionFieldNames";
035
036    public <T> ComponentAdapter<T> createComponentAdapter(ComponentMonitor monitor,
037                                                   LifecycleStrategy lifecycleStrategy,
038                                                   Properties componentProperties,
039                                                   Object componentKey,
040                                                   Class<T> componentImplementation,
041                                                   Parameter... parameters) throws PicoCompositionException {
042        String fieldNames = (String) componentProperties.remove(INJECTION_FIELD_NAMES);
043        if (fieldNames == null) {
044            fieldNames = "";
045        }
046        return wrapLifeCycle(monitor.newInjector(new NamedFieldInjector(componentKey, componentImplementation, parameters, monitor,
047                fieldNames)), lifecycleStrategy);
048    }
049
050    public static Properties injectionFieldNames(String... fieldNames) {
051        StringBuilder sb = new StringBuilder();
052        for (int i = 0; i < fieldNames.length; i++) {
053            sb.append(" ").append(fieldNames[i]);
054        }
055        Properties retVal = new Properties();
056        return immutable(INJECTION_FIELD_NAMES, sb.toString().trim());
057    }
058
059}