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PicoContainer example source code file (Parameter.java)

This example PicoContainer source code file (Parameter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - PicoContainer tags/keywords

class, class, componentadapter, componentadapter, default, object, parameter, parameter, parametername, parametername, zero

The PicoContainer Parameter.java source code

/*****************************************************************************
 * Copyright (c) PicoContainer Organization. All rights reserved.            *
 * ------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the BSD      *
 * style license a copy of which has been included with this distribution in *
 * the LICENSE.txt file.                                                     *
 *                                                                           *
 * Idea by Rachel Davies, Original code by Jon Tirsen                        *
 *****************************************************************************/

package org.picocontainer;

import org.picocontainer.parameters.ComponentParameter;

/**
 * This class provides control over the arguments that will be passed to a constructor. It can be used for finer control over
 * what arguments are passed to a particular constructor.
 *
 * @author Jon Tirsén
 * @author Aslak Hellesøy
 * @author Thomas Heller
 * @see MutablePicoContainer#addComponent(Object,Object,Parameter[]) a method on the
 *      {@link MutablePicoContainer} interface which allows passing in of an array of {@linkplain Parameter Parameters}.
 * @see org.picocontainer.parameters.ComponentParameter an implementation of this interface that allows you to specify the key
 *      used for resolving the parameter.
 * @see org.picocontainer.parameters.ConstantParameter an implementation of this interface that allows you to specify a constant
 *      that will be used for resolving the parameter.
 */
public interface Parameter {

    Parameter[] ZERO = new Parameter[0];
    Parameter[] DEFAULT = new Parameter[]{ ComponentParameter.DEFAULT };

    /**
     * Retrieve the object from the Parameter that statisfies the expected type.
     *
     * @param container             the container from which dependencies are resolved.
     * @param adapter               the {@link org.picocontainer.ComponentAdapter} that is asking for the instance
     * @param expectedType          the type that the returned instance needs to match.
     * @param expectedParameterName Expected parameter name
     *
     * @return the instance or <code>null if no suitable instance can be found.
     *
     * @throws PicoCompositionException if a referenced component could not be instantiated.
     */
    Object resolveInstance(PicoContainer container,
                           ComponentAdapter adapter,
                           Class expectedType,
                           ParameterName expectedParameterName);

    /**
     * Check if the Parameter can statisfy the expected type using the container.
     *
     * @param container             the container from which dependencies are resolved.
     * @param adapter               the {@link ComponentAdapter} that is asking for the instance
     * @param expectedType          the required type
     * @param expectedParameterName Expected parameter name
     *
     * @return <code>true if the component parameter can be resolved.
     *
     */
    boolean isResolvable(PicoContainer container,
                         ComponentAdapter adapter,
                         Class expectedType,
                         ParameterName expectedParameterName);

    /**
     * Verify that the Parameter can statisfied the expected type using the container
     *
     * @param container             the container from which dependencies are resolved.
     * @param adapter               the {@link org.picocontainer.ComponentAdapter} that is asking for the verification
     * @param expectedType          the required type
     * @param expectedParameterName Expected parameter name
     *
     * @throws PicoCompositionException if parameter and its dependencies cannot be resolved
     */
    void verify(PicoContainer container,
                ComponentAdapter adapter,
                Class expectedType,
                ParameterName expectedParameterName);

    /**
     * Accepts a visitor for this Parameter. The method is normally called by visiting a {@link ComponentAdapter}, that
     * cascades the {@linkplain PicoVisitor visitor} also down to all its {@linkplain Parameter Parameters}.
     *
     * @param visitor the visitor.
     *
     */
    void accept(PicoVisitor visitor);
}

Other PicoContainer examples (source code examples)

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