/*
* JBoss, Home of Professional Open Source
* Copyright 2006, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.kernel.plugins.dependency;
import java.util.Set;
import org.jboss.dependency.spi.Cardinality;
import org.jboss.dependency.spi.Controller;
import org.jboss.dependency.spi.ControllerState;
import org.jboss.kernel.spi.dependency.KernelController;
import org.jboss.kernel.spi.dependency.KernelControllerContext;
import org.jboss.util.HashCode;
import org.jboss.util.JBossStringBuilder;
/**
* A Callback dependencyItem.
*
* @author <a href="ales.justin@gmail.com">Ales Justin</a>
*/
public class CallbackDependencyItem extends ClassDependencyItem
{
private Cardinality cardinality;
public CallbackDependencyItem(Object name, Class<?> demandClass, ControllerState whenRequired, ControllerState dependentState, Cardinality cardinality)
{
super(name, demandClass, whenRequired, dependentState);
if (cardinality == null)
throw new IllegalArgumentException("Null cardinality.");
this.cardinality = cardinality;
}
public Cardinality getCardinality()
{
return cardinality;
}
protected Set<KernelControllerContext> getContexts(Controller controller)
{
if (controller instanceof KernelController == false)
throw new IllegalArgumentException("Controller not KernelController!");
KernelController kernelController = (KernelController)controller;
return kernelController.getContexts(getDemandClass(), getDependentState());
}
public boolean resolve(Controller controller)
{
Set<KernelControllerContext> contexts = getContexts(controller);
int size = contexts != null ? contexts.size() : 0;
if (cardinality.isInRange(size))
{
setIDependOn(getIDependOn());
if (contexts != null)
{
for (KernelControllerContext context : contexts)
addDependsOnMe(controller, context);
}
setResolved(true);
}
else
{
setResolved(false);
}
return isResolved();
}
public boolean unresolved(Controller controller)
{
if (getIDependOn() == null)
return true;
Set<KernelControllerContext> contexts = getContexts(controller);
// minus one, since this is called when unistalling dependent context
int size = contexts != null ? contexts.size() - 1 : 0;
return cardinality.isInRange(size) == false;
}
protected int getHashCode()
{
int result = HashCode.generate(getName());
result += 3 * HashCode.generate(getIDependOn());
result += 7 * HashCode.generate(getWhenRequired());
result += 11 * HashCode.generate(getDependentState());
result += 19 * HashCode.generate(getCardinality());
return result;
}
public boolean equals(Object obj)
{
if (obj instanceof CallbackDependencyItem == false)
return false;
CallbackDependencyItem cdi = (CallbackDependencyItem)obj;
if (isDifferent(getName(), cdi.getName()))
return false;
if (isDifferent(getIDependOn(), cdi.getIDependOn()))
return false;
if (isDifferent(getWhenRequired(), cdi.getWhenRequired()))
return false;
if (isDifferent(getDependentState(), cdi.getDependentState()))
return false;
if (isDifferent(getCardinality(), cdi.getCardinality()))
return false;
return true;
}
protected static boolean isDifferent(Object first, Object second)
{
if (first == null)
return second != null;
else
return first.equals(second) == false;
}
@Override
public void toString(JBossStringBuilder buffer)
{
super.toString(buffer);
buffer.append(" cardinality=" + cardinality);
}
@Override
public String toHumanReadableString()
{
return "Cardinality usage: '" + cardinality + "' and " + super.toHumanReadableString();
}
}