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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
AbstractComponentAdapter.java | 100% | 100% | 100% | 100% |
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/*****************************************************************************
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* Copyright (C) PicoContainer Organization. All rights reserved. *
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* ------------------------------------------------------------------------- *
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* The software in this package is published under the terms of the BSD *
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* style license a copy of which has been included with this distribution in *
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* the LICENSE.txt file. *
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* *
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* Original code by *
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*****************************************************************************/
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package org.picocontainer.defaults;
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import org.picocontainer.ComponentAdapter;
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import org.picocontainer.PicoVisitor;
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import java.io.Serializable;
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/**
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* Base class for a ComponentAdapter with general functionality.
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* This implementation provides basic checks for a healthy implementation of a ComponentAdapter.
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* It does not allow to use <code>null</code> for the component key or the implementation,
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* ensures that the implementation is a concrete class and that the key is assignable from the
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* implementation if the key represents a type.
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*
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* @author Paul Hammant
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* @author Aslak Hellesøy
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* @author Jon Tirsén
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* @version $Revision: 1.20 $
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* @since 1.0
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*/
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public abstract class AbstractComponentAdapter implements ComponentAdapter, Serializable { |
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private Object componentKey;
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private Class componentImplementation;
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/**
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* Constructs a new ComponentAdapter for the given key and implementation.
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* @param componentKey the search key for this implementation
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* @param componentImplementation the concrete implementation
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* @throws AssignabilityRegistrationException if the key is a type and the implementation cannot be assigned to.
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*/
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protected AbstractComponentAdapter(Object componentKey, Class componentImplementation) throws AssignabilityRegistrationException { |
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if (componentImplementation == null) { |
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throw new NullPointerException("componentImplementation"); |
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} |
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this.componentKey = componentKey;
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this.componentImplementation = componentImplementation;
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checkTypeCompatibility(); |
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} |
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/**
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* {@inheritDoc}
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* @see org.picocontainer.ComponentAdapter#getComponentKey()
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*/
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public Object getComponentKey() {
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if (componentKey == null) { |
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throw new NullPointerException("componentKey"); |
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} |
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return componentKey;
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} |
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/**
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* {@inheritDoc}
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* @see org.picocontainer.ComponentAdapter#getComponentImplementation()
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*/
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public Class getComponentImplementation() {
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return componentImplementation;
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} |
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protected void checkTypeCompatibility() throws AssignabilityRegistrationException { |
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if (componentKey instanceof Class) { |
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Class componentType = (Class) componentKey; |
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if (!componentType.isAssignableFrom(componentImplementation)) {
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throw new AssignabilityRegistrationException(componentType, componentImplementation); |
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} |
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} |
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} |
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/**
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* @return Returns the ComponentAdapter's class name and the component's key.
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* @see java.lang.Object#toString()
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*/
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public String toString() {
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return getClass().getName() + "[" + getComponentKey() + "]"; |
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} |
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public void accept(PicoVisitor visitor) { |
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visitor.visitComponentAdapter(this);
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} |
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} |
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