/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * 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 com.ibm.bi.dml.parser;

import java.util.ArrayList;



public class WhileStatement extends Statement
{
		
	
	private ConditionalPredicate _predicate;
	private ArrayList<StatementBlock> _body;
	
	public Statement rewriteStatement(String prefix) throws LanguageException{
		LOG.error(this.printErrorLocation() + "should not call rewriteStatement for WhileStatement");
		throw new LanguageException(this.printErrorLocation() + "should not call rewriteStatement for WhileStatement");
	}
	
	public WhileStatement(){
		 _predicate = null;
		 _body = new ArrayList<StatementBlock>();
	}
	
	public void setPredicate(ConditionalPredicate pred){
		_predicate = pred;
	}
	
	
	public void addStatementBlock(StatementBlock sb){
		_body.add(sb);
	}
	
	public ConditionalPredicate getConditionalPredicate(){
		return _predicate;
	}
	
	public ArrayList<StatementBlock> getBody(){
		return _body;
	}
	
	public void setBody(ArrayList<StatementBlock> body){
		_body = body;
	}
	
	@Override
	public boolean controlStatement() {
		return true;
	}
	

	public void mergeStatementBlocks(){
		_body = StatementBlock.mergeStatementBlocks(_body);
	}
	
	public String toString(){
		StringBuilder sb = new StringBuilder();
		sb.append("while ( ");
		sb.append(_predicate.toString());
		sb.append(") { \n");
		for (StatementBlock block : _body){
			sb.append(block.toString());
		}
		sb.append("}\n");
		return sb.toString();
	}

	public void initializeforwardLV(VariableSet activeIn) throws LanguageException{
		LOG.error(this.printErrorLocation() + "should never call initializeforwardLV for WhileStatement");
		throw new LanguageException(this.printErrorLocation() + "should never call initializeforwardLV for WhileStatement");
	}
	
	public VariableSet initializebackwardLV(VariableSet lo) throws LanguageException{
		LOG.error(this.printErrorLocation() + "should never call initializeforwardLV for WhileStatement");
		throw new LanguageException(this.printErrorLocation() + "should never call initializeforwardLV for WhileStatement");
		
	}
	
	@Override
	public VariableSet variablesRead() {
		LOG.warn(this.printWarningLocation() + "should not call variablesRead from WhileStatement ");
		return new VariableSet();
	}

	@Override
	public VariableSet variablesUpdated() {
		LOG.warn(this.printWarningLocation() + "should not call variablesRead from WhileStatement ");
		return new VariableSet();
	}
}