org.nakedobjects.metamodel.facets.collections.modify.CollectionClearFacetViaAccessor Maven / Gradle / Ivy

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package org.nakedobjects.metamodel.facets.collections.modify;

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.nakedobjects.applib.DomainObjectContainer;
import org.nakedobjects.metamodel.adapter.NakedObject;
import org.nakedobjects.metamodel.facets.FacetHolder;
import org.nakedobjects.metamodel.java5.ImperativeFacet;
import org.nakedobjects.metamodel.runtimecontext.RuntimeContext;
import org.nakedobjects.metamodel.util.NakedObjectInvokeUtils;


public class CollectionClearFacetViaAccessor extends CollectionClearFacetAbstract implements ImperativeFacet {

    private final Method method;
	private final RuntimeContext runtimeContext;

    public CollectionClearFacetViaAccessor(
    		final Method method, 
    		final FacetHolder holder, 
    		final RuntimeContext runtimeContext) {
        super(holder);
        this.method = method;
        this.runtimeContext = runtimeContext;
    }

    /**
     * Returns a singleton list of the {@link Method} provided in the constructor. 
     */
    public List getMethods() {
    	return Collections.singletonList(method);
    }

	public boolean impliesResolve() {
		return true;
	}

	/**
	 * Bytecode cannot automatically call {@link DomainObjectContainer#objectChanged(Object)}
	 * because cannot distinguish whether interacting with accessor to read it or to modify its contents.
	 */
	public boolean impliesObjectChanged() {
		return false;
	}

    public void clear(final NakedObject owningAdapter) {
        final Collection collection = (Collection) NakedObjectInvokeUtils.invoke(method, owningAdapter);
        collection.clear();
        final NakedObject adapter = getRuntimeContext().getAdapterFor(owningAdapter);
        getRuntimeContext().objectChanged(adapter);
    }

	@Override
    protected String toStringValues() {
        return "method=" + method;
    }


    ///////////////////////////////////////////////////////////
    // Dependencies (from constructor)
    ///////////////////////////////////////////////////////////

    private RuntimeContext getRuntimeContext() {
		return runtimeContext;
	}

    
}

// Copyright (c) Naked Objects Group Ltd.