/*
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.commands.runtime.rule;

import javax.xml.bind.annotation.XmlAttribute;

import org.drools.core.common.InternalFactHandle;
import org.kie.api.command.ExecutableCommand;
import org.kie.api.runtime.Context;
import org.kie.api.runtime.ExecutionResults;
import org.kie.api.runtime.KieSession;
import org.kie.api.runtime.rule.EntryPoint;
import org.kie.api.runtime.rule.FactHandle;
import org.kie.internal.command.RegistryContext;

public class GetFactHandleInEntryPointCommand
    implements
    ExecutableCommand<FactHandle> {

    private Object object;
    private boolean disconnected;
    private String entryPoint;

    @XmlAttribute(name="out-identifier")
    private String outIdentifier;

    public GetFactHandleInEntryPointCommand() {
    }

    public GetFactHandleInEntryPointCommand(Object object, String entryPoint) {
        this.object = object;
        this.entryPoint = entryPoint;
        this.disconnected = false;
    }

    public GetFactHandleInEntryPointCommand(Object object, String entryPoint, boolean disconnected) {
        this.object = object;
        this.entryPoint = entryPoint;
        this.disconnected = disconnected;
    }

    public String getOutIdentifier() {
        return outIdentifier;
    }

    public void setOutIdentifier(String outIdentifier) {
        this.outIdentifier = outIdentifier;
    }

    public FactHandle execute(Context context) {
        KieSession ksession = ((RegistryContext) context).lookup( KieSession.class );
        EntryPoint ep = ksession.getEntryPoint(entryPoint);
        InternalFactHandle factHandle = (InternalFactHandle) ep.getFactHandle( object );
        if ( factHandle != null ){
            InternalFactHandle handle = factHandle.clone();
            if ( disconnected ) {
                handle.disconnect();
            }

            if ( this.outIdentifier != null ) {
                ((RegistryContext) context).lookup(ExecutionResults.class).setResult(this.outIdentifier, handle);
            }

            return handle;
        }
        return null;
    }

    public String toString() {
        return "ksession.getEntryPoint( " + entryPoint + " ).getFactHandle( " + object + " );";
    }
}
