package org.marketcetera.photon.internal.strategy.engine.ui.workbench.handlers;

import org.eclipse.core.runtime.IProgressMonitor;
import org.marketcetera.photon.commons.ui.workbench.AbstractSelectionHandler;
import org.marketcetera.photon.strategy.engine.model.core.DeployedStrategy;
import org.marketcetera.photon.strategy.engine.model.core.StrategyState;
import org.marketcetera.util.misc.ClassVersion;

import com.google.common.base.Predicate;

/* $License$ */

/**
 * Handler for the {@code
 * org.marketcetera.photon.strategy.engine.ui.workbench.start} command that
 * starts selected {@link DeployedStrategy} objects. If one fails, the operation
 * will be aborted at that point.
 * 
 * @author <a href="mailto:will@marketcetera.com">Will Horn</a>
 * @version $Id: StartHandler.java 16154 2012-07-14 16:34:05Z colin $
 * @since 2.0.0
 */
@ClassVersion("$Id: StartHandler.java 16154 2012-07-14 16:34:05Z colin $")
public final class StartHandler extends
        AbstractSelectionHandler<DeployedStrategy> {

    private static final Predicate<DeployedStrategy> sStoppedStrategies = new Predicate<DeployedStrategy>() {
        @Override
        public boolean apply(DeployedStrategy input) {
            return input.getState() == StrategyState.STOPPED;
        }
    };

    /**
     * Returns a predicate that filters stopped strategies.
     * 
     * @return the predicate
     */
    static Predicate<DeployedStrategy> stoppedStrategies() {
        return sStoppedStrategies;
    }

    /**
     * Constructor.
     */
    public StartHandler() {
        super(DeployedStrategy.class, Messages.START_HANDLER_FAILED,
                stoppedStrategies());
    }

    @Override
    protected void process(DeployedStrategy item, IProgressMonitor monitor)
            throws Exception {
        monitor.setTaskName(Messages.START_HANDLER__TASK_NAME.getText(item
                .getInstanceName(), item.getEngine().getName()));
        item.getEngine().getConnection().start(item);
    }
}