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/*-
* ============LICENSE_START=======================================================
* openECOMP : SDN-C
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdnc.sli;
import java.util.LinkedList;
import java.util.List;
public class SvcLogicBinaryExpression extends SvcLogicExpression {
public enum OperatorType {
addOp("+"),
subOp("-"),
multOp("*"),
divOp("/"),
equalOp("=="),
ltOp("<"),
leOp("<="),
gtOp(">"),
geOp(">="),
neOp("!="),
andOp("and"),
orOp("or");
private String text;
private OperatorType(String text)
{
this.text = text;
}
public String getText()
{
return(text);
}
public static OperatorType fromString(String text)
{
if (text != null)
{
for (OperatorType t : OperatorType.values())
{
if (text.equalsIgnoreCase(t.getText())) {
return(t);
}
}
}
return(null);
}
public String toString()
{
return(text);
}
}
private List<OperatorType> operators;
public List<OperatorType> getOperators() {
return operators;
}
public SvcLogicBinaryExpression()
{
operators = new LinkedList<OperatorType>();
}
public void addOperator(String operator)
{
operators.add(OperatorType.fromString(operator));
}
public String toString()
{
List<SvcLogicExpression>operands = getOperands();
StringBuffer sbuff = new StringBuffer();
sbuff.append(operands.get(0).toString());
for (int i = 0 ; i < operators.size(); i++)
{
sbuff.append(" ");
sbuff.append(operators.get(i));
sbuff.append(" ");
if (i + 1 < operands.size()) {
sbuff.append(operands.get(i + 1).toString());
} else {
// expression incomplete; operand not bound yet
sbuff.append("?");
}
}
return(sbuff.toString());
}
public String asParsedExpr() {
List<SvcLogicExpression> operands = getOperands();
if (operators.isEmpty()) {
return operands.get(0).asParsedExpr();
} else {
StringBuffer sbuff = new StringBuffer();
// operators in reverse order for left associativity
for (int i = operators.size() - 1; i >= 0; --i) {
sbuff.append("(");
sbuff.append(operators.get(i).getText());
sbuff.append(" ");
}
for (int i = 0; i < operators.size() + 1; ++i) {
if (i < operands.size()) {
sbuff.append(operands.get(i).asParsedExpr());
} else {
// expression incomplete; operand not bound yet
sbuff.append("?");
}
if (i != 0) {
sbuff.append(")");
}
if (i < operators.size()) {
sbuff.append(" ");
}
}
return sbuff.toString();
}
}
}
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