Program.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 org.apache.sysml.runtime.controlprogram;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;

import org.apache.sysml.parser.DMLProgram;
import org.apache.sysml.runtime.DMLRuntimeException;
import org.apache.sysml.runtime.DMLScriptException;
import org.apache.sysml.runtime.controlprogram.context.ExecutionContext;


public class Program 
{
	
	public static final String KEY_DELIM = "::";
	
	public ArrayList<ProgramBlock> _programBlocks;

	private HashMap<String, HashMap<String,FunctionProgramBlock>> _namespaceFunctions;
	
	public Program() throws DMLRuntimeException {
		_namespaceFunctions = new HashMap<String, HashMap<String,FunctionProgramBlock>>(); 
		_programBlocks = new ArrayList<ProgramBlock>();
	}

	public synchronized void addFunctionProgramBlock(String namespace, String fname, FunctionProgramBlock fpb)
	{	
		if (namespace == null) 
			namespace = DMLProgram.DEFAULT_NAMESPACE;
		
		HashMap<String,FunctionProgramBlock> namespaceBlocks = null;
		namespaceBlocks = _namespaceFunctions.get(namespace);
		if (namespaceBlocks == null){
			namespaceBlocks = new HashMap<String,FunctionProgramBlock>();
			_namespaceFunctions.put(namespace,namespaceBlocks);
		}
		
		namespaceBlocks.put(fname,fpb);
	}

	public synchronized void removeFunctionProgramBlock(String namespace, String fname) 
	{	
		if (namespace == null) 
			namespace = DMLProgram.DEFAULT_NAMESPACE;
		
		HashMap<String,FunctionProgramBlock> namespaceBlocks = null;
		if( _namespaceFunctions.containsKey(namespace) ){
			namespaceBlocks = _namespaceFunctions.get(namespace);
			if( namespaceBlocks.containsKey(fname) )
				namespaceBlocks.remove(fname);
		}
	}

	public synchronized HashMap<String,FunctionProgramBlock> getFunctionProgramBlocks(){
		
		HashMap<String,FunctionProgramBlock> retVal = new HashMap<String,FunctionProgramBlock>();
		
		//create copy of function program blocks
		for (String namespace : _namespaceFunctions.keySet()){
			HashMap<String,FunctionProgramBlock> namespaceFSB = _namespaceFunctions.get(namespace);
			for( Entry<String, FunctionProgramBlock> e: namespaceFSB.entrySet() ){
				String fname = e.getKey(); 
				FunctionProgramBlock fpb = e.getValue();
				String fKey = DMLProgram.constructFunctionKey(namespace, fname);
				retVal.put(fKey, fpb);
			}
		}
		
		return retVal;
	}

	public synchronized FunctionProgramBlock getFunctionProgramBlock(String namespace, String fname) throws DMLRuntimeException{
		
		if (namespace == null) namespace = DMLProgram.DEFAULT_NAMESPACE;
		
		HashMap<String,FunctionProgramBlock> namespaceFunctBlocks = _namespaceFunctions.get(namespace);
		if (namespaceFunctBlocks == null)
			throw new DMLRuntimeException("namespace " + namespace + " is undefined");
		FunctionProgramBlock retVal = namespaceFunctBlocks.get(fname);
		if (retVal == null)
			throw new DMLRuntimeException("function " + fname + " is undefined in namespace " + namespace);
		
		return retVal;
	}
	
	public void addProgramBlock(ProgramBlock pb) {
		_programBlocks.add(pb);
	}

	public ArrayList<ProgramBlock> getProgramBlocks() {
		return _programBlocks;
	}

	public void execute(ExecutionContext ec)
		throws DMLRuntimeException
	{
		ec.initDebugProgramCounters();
		
		try
		{
			for (int i=0 ; i<_programBlocks.size() ; i++) {
				ec.updateDebugState(i);
				_programBlocks.get(i).execute(ec);
			}
		}
		catch(DMLScriptException e) {
			throw e;
		}
		catch(Exception e) {
			throw new DMLRuntimeException(e);
		}
		
		ec.clearDebugProgramCounters();
	}
}