/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */
package org.teiid.query.function;

import java.util.Collection;
import java.util.Map;
import org.teiid.core.CoreConstants;
import org.teiid.designer.runtime.version.spi.ITeiidServerVersion;
import org.teiid.metadata.Datatype;
import org.teiid.metadata.FunctionMethod;
import org.teiid.query.function.metadata.FunctionMetadataValidator;
import org.teiid.query.function.source.SystemSource;
import org.teiid.query.validator.ValidatorReport;
import org.teiid.runtime.client.Messages;


public class SystemFunctionManager {

	private FunctionTree systemFunctionTree;
	private boolean allowEnvFunction = true;
	private final ClassLoader classLoader;
    private final ITeiidServerVersion teiidVersion;
    private Map<String, Datatype> types;

	/**
	 * @param teiidVersion
	 * @param classLoader 
     */
    public SystemFunctionManager(ITeiidServerVersion teiidVersion, ClassLoader classLoader) {
        this.teiidVersion = teiidVersion;
        this.classLoader = classLoader;
    }

    /**
     * @param teiidVersion
     * @param classLoader 
     * @param typeMap
     */
    public SystemFunctionManager(ITeiidServerVersion teiidVersion, ClassLoader classLoader, Map<String, Datatype> typeMap) {
        this(teiidVersion, classLoader);
        this.types = typeMap;
    }

    /**
     * @return the teiidVersion
     */
    public ITeiidServerVersion getTeiidVersion() {
        return this.teiidVersion;
    }

	public FunctionTree getSystemFunctions() {
    	if(systemFunctionTree == null) { 
	    	// Create the system source and add it to the source list
	    	SystemSource systemSource = new SystemSource(getTeiidVersion(), this.allowEnvFunction, classLoader);
			// Validate the system source - should never fail
	    	ValidatorReport report = new ValidatorReport("Function Validation"); //$NON-NLS-1$
	        Collection<FunctionMethod> functionMethods = systemSource.getFunctionMethods();
	    	FunctionMetadataValidator.validateFunctionMethods(teiidVersion, functionMethods, report, types);
			if(report.hasItems()) {
			    // Should never happen as SystemSourcTe doesn't change
			    System.err.println(Messages.getString(Messages.ERR.ERR_015_001_0005, report));
			}
			systemFunctionTree = new FunctionTree(teiidVersion, CoreConstants.SYSTEM_MODEL, systemSource, true);
    	}
    	return systemFunctionTree;
    }
    
    public FunctionLibrary getSystemFunctionLibrary() {
    	return new FunctionLibrary(getTeiidVersion(), getSystemFunctions());
    }
    
    public boolean isAllowEnvFunction() {
		return allowEnvFunction;
	}

	public void setAllowEnvFunction(boolean allowEnvFunction) {
		this.allowEnvFunction = allowEnvFunction;
	}    
	
    public ClassLoader getClassLoader() {
    	return this.classLoader;
    }
}