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JPMML class model transpiler
There is a newer version: 1.3.8
/*
 * Copyright (c) 2018 Villu Ruusmann
 *
 * This file is part of JPMML-Transpiler
 *
 * JPMML-Transpiler is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JPMML-Transpiler 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with JPMML-Transpiler.  If not, see .
 */
package org.jpmml.translator;

import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

import com.sun.codemodel.JBlock;
import com.sun.codemodel.JExpression;
import com.sun.codemodel.JType;
import com.sun.codemodel.JVar;

public class Scope {

	private JBlock block = null;

	private Map variables = null;

	private Set nonMissingVariables = null;

	private boolean open = true;


	public Scope(JBlock block){
		setBlock(block);
	}

	public void cleanVariableInfo(){

		if(this.variables != null){
			this.variables.clear();
		} // End if

		if(this.nonMissingVariables != null){
			this.nonMissingVariables.clear();
		}
	}

	public boolean isNonMissing(OperableRef operableRef){
		JExpression expression = operableRef.getExpression();

		if(expression instanceof JVar){
			JVar variable = (JVar)expression;

			return isNonMissing(variable);
		}

		return false;
	}

	public boolean isNonMissing(JVar variable){
		return (this.nonMissingVariables != null && this.nonMissingVariables.contains(variable.name()));
	}

	public void markNonMissing(OperableRef operableRef){
		JExpression expression = operableRef.getExpression();

		if(expression instanceof JVar){
			JVar variable = (JVar)expression;

			markNonMissing(variable);
		}
	}

	public void markNonMissing(JVar variable){

		if(this.nonMissingVariables == null){
			this.nonMissingVariables = new LinkedHashSet<>();
		}

		this.nonMissingVariables.add(variable.name());
	}

	public Scope ensureOpen(){
		boolean open = isOpen();

		if(!open){
			throw new IllegalStateException();
		}

		return this;
	}

	public Scope close(){
		setOpen(false);

		return this;
	}

	public JVar declare(JType type, String name, JExpression initializer){
		JBlock block = getBlock();

		JVar variable = block.decl(type, name, initializer);

		return putVariable(variable);
	}

	public JVar getVariable(String name){

		if(this.variables == null){
			return null;
		}

		return this.variables.get(name);
	}

	public JVar putVariable(JVar variable){

		if(this.variables == null){
			this.variables = new LinkedHashMap<>();
		}

		this.variables.put(variable.name(), variable);

		return variable;
	}

	public JBlock getBlock(){
		return this.block;
	}

	private void setBlock(JBlock block){
		this.block = Objects.requireNonNull(block);
	}

	public boolean isOpen(){
		return this.open;
	}

	private void setOpen(boolean open){
		this.open = open;
	}

	public static final String VAR_ARGUMENTS = "arguments";
	public static final String VAR_CONTEXT = "context";
	public static final String VAR_VALUEFACTORY = "valueFactory";
}