/*
* 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.processor.xml;
import java.util.ArrayList;
import java.util.List;
import org.teiid.client.plan.PlanNode;
/**
* A program is a sequence of {@link ProcessorInstruction ProcessorInstructions}. Certain
* ProcessorInstructions, such as {@link IfInstruction} and {@link WhileInstruction} may have
* pointers to sub programs. XMLPlan will maintain a stack of programs during
* execution.
*/
public class Program {
private List<ProcessorInstruction> processorInstructions;
/**
* Constructor for Program.
*/
public Program() {
super();
}
/**
* Returns the instruction to be executed at the indicated index,
* or null if there is no instruction at that index.
* @return instruction to be executed at the indicated index,
* or null if there is no instruction at that index.
*/
public ProcessorInstruction getInstructionAt(int instructionIndex){
return getInstructionAtIndex(instructionIndex);
}
/**
* Removes the instruction to be executed at the indicated index,
* or do nothing if there is no instruction at that index.
* @param instructionIndex index of instruction to be removed
*/
public void removeInstructionAt(int instructionIndex) {
List<ProcessorInstruction> instructions = getProcessorInstructions();
if (instructionIndex < instructions.size()) {
instructions.remove(instructionIndex);
}
}
public void addInstruction(ProcessorInstruction instruction){
if (instruction != null){
getProcessorInstructions().add(instruction);
}
}
public void addInstructions(Program instructions){
if (instructions != null){
getProcessorInstructions().addAll(instructions.getProcessorInstructions());
}
}
public String toString(){
return ("PROGRAM size " + getProcessorInstructions().size()); //$NON-NLS-1$
}
public PlanNode getDescriptionProperties() {
PlanNode props = new PlanNode("XML Program"); //$NON-NLS-1$
if(this.processorInstructions != null) {
for (int i = 0; i < processorInstructions.size(); i++) {
ProcessorInstruction inst = processorInstructions.get(i);
PlanNode childProps = inst.getDescriptionProperties();
props.addProperty("Instruction " + i, childProps); //$NON-NLS-1$
}
}
return props;
}
//=========================================================================
//UTILITY
//=========================================================================
/**
* Returns the instruction to be executed at the indicated index,
* or null if there is no instruction at that index.
* @return instruction to be executed at the indicated index,
* or null if there is no instruction at that index.
*/
private ProcessorInstruction getInstructionAtIndex(int instructionIndex){
if (processorInstructions != null){
if (instructionIndex < getProcessorInstructions().size()){
return getProcessorInstructions().get(instructionIndex);
}
}
return null;
}
List<ProcessorInstruction> getProcessorInstructions(){
if (processorInstructions == null){
processorInstructions = new ArrayList<ProcessorInstruction>();
}
return processorInstructions;
}
}