gogo/src/aQute/cpeg/Procedural.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 aQute.cpeg;


import org.osgi.framework.*;
import org.osgi.service.command.*;


public class Procedural {
    
    public Object _if( CommandSession session, Function condition, Function ifTrue, Function ifFalse ) throws Exception {
        Object result = condition.execute(session, null);
        if ( isTrue(result)) {
            return ifTrue.execute(session, null);
        } else {
            if ( ifFalse != null )
                return ifFalse.execute(session,null);
        }
        return null;
    }
    
    public Object _new(String name, Bundle bundle) throws Exception {
        if ( bundle == null)
            return Class.forName(name).newInstance();
        else {
            return bundle.loadClass(name).newInstance();
        }
    }

    private boolean isTrue(Object result) {
        if ( result == null)
            return false;
        
        if ( result instanceof String && ((String)result).equals(""))
            return false;
        
        if ( result instanceof Boolean )
            return ((Boolean)result).booleanValue();
        
        return true;
    }
}