001    package org.picocontainer.containers;
002    
003    import java.io.Serializable;
004    import java.util.Collection;
005    import java.util.List;
006    import java.lang.annotation.Annotation;
007    import java.lang.reflect.Type;
008    
009    import org.picocontainer.ComponentAdapter;
010    import org.picocontainer.NameBinding;
011    import org.picocontainer.PicoContainer;
012    import org.picocontainer.PicoException;
013    import org.picocontainer.PicoVisitor;
014    
015    /**
016     * abstract base class for immutable delegation to pico
017     * 
018     * @author k.pribluda
019     * 
020     */
021    public abstract class AbstractDelegatingPicoContainer implements PicoContainer, Serializable{
022    
023        private PicoContainer delegate;
024    
025        public AbstractDelegatingPicoContainer(PicoContainer delegate) {
026                    if (delegate == null) {
027                            throw new NullPointerException(
028                                            "PicoContainer delegate must not be null");
029                    }
030                    this.delegate = delegate;
031            }
032    
033            public final void accept(PicoVisitor visitor) {
034            visitor.visitContainer(this);
035            delegate.accept(visitor);
036            }
037    
038    
039            public boolean equals(Object obj) {
040                    // required to make it pass on both jdk 1.3 and jdk 1.4. Btw, what about
041                    // overriding hashCode()? (AH)
042                    return delegate.equals(obj) || this == obj;
043            }
044    
045            public <T> T getComponent(Class<T> componentType) {
046                    return componentType.cast(getComponent((Object) componentType));
047            }
048    
049        public <T> T getComponent(Class<T> componentType, Class<? extends Annotation> binding) {
050            return delegate.getComponent(componentType, binding);
051        }
052    
053        public Object getComponent(Object componentKeyOrType) {
054                    return delegate.getComponent(componentKeyOrType);
055            }
056    
057        public Object getComponent(Object componentKeyOrType, Type into) {
058            return delegate.getComponent(componentKeyOrType, into);
059        }
060    
061        public <T> ComponentAdapter<T> getComponentAdapter(Class<T> componentType,
062                            NameBinding componentNameBinding) {
063                    return delegate.getComponentAdapter(componentType,
064                                                componentNameBinding);
065            }
066    
067        public <T> ComponentAdapter<T> getComponentAdapter(Class<T> componentType, Class<? extends Annotation> binding) {
068            return delegate.getComponentAdapter(componentType, binding);
069        }
070    
071        public ComponentAdapter<?> getComponentAdapter(Object componentKey) {
072                    return delegate.getComponentAdapter(componentKey);
073            }
074    
075            public Collection<ComponentAdapter<?>> getComponentAdapters() {
076                    return delegate.getComponentAdapters();
077            }
078    
079            public <T> List<ComponentAdapter<T>> getComponentAdapters(
080                            Class<T> componentType) {
081                    return delegate.getComponentAdapters(componentType);
082            }
083    
084        public <T> List<ComponentAdapter<T>> getComponentAdapters(Class<T> componentType, Class<? extends Annotation> binding) {
085            return delegate.getComponentAdapters(componentType, binding);
086        }    
087    
088        public List<Object> getComponents() {
089                    return delegate.getComponents();
090            }
091    
092            public <T> List<T> getComponents(Class<T> type) throws PicoException {
093                    return delegate.getComponents(type);
094            }
095    
096            public PicoContainer getDelegate() {
097                    return delegate;
098            }
099    
100            public PicoContainer getParent() {
101                    return delegate.getParent();
102            }
103        
104        public String toString() {
105            return "D<" + delegate.toString();
106        }
107    }