OrExpression.java

package org.yamcs.yarch.streamsql;


import org.yamcs.yarch.DataType;
import org.yamcs.yarch.DbReaderStream;

import org.yamcs.yarch.streamsql.Expression;
import org.yamcs.yarch.streamsql.GenericStreamSqlException;
import org.yamcs.yarch.streamsql.NotSupportedException;
import org.yamcs.yarch.streamsql.ParseException;
import org.yamcs.yarch.streamsql.StreamSqlException;


public class OrExpression extends Expression {

    public OrExpression(Expression left, Expression right) throws ParseException {
        super(new Expression[] {left, right});
    }


    @Override
    public Expression addFilter(DbReaderStream tableStream) throws StreamSqlException {
        throw new NotSupportedException("OR");
    }


    @Override
    public void doBind() throws StreamSqlException {
        for(Expression c:children) {
            if(c.getType()!=DataType.BOOLEAN) throw new GenericStreamSqlException("'"+c+"' is not of type boolean");
        }
        type=DataType.BOOLEAN;
    }

    @Override
    public void fillCode_getValueReturn(StringBuilder code) throws StreamSqlException  {
        boolean first=true;
        code.append("(");
        for(Expression expr:children) {
            if(!first) code.append("||");
            else first=false;
            expr.fillCode_getValueReturn(code);
        }
        code.append(")");
    }


    @Override
    public String toString() {
        StringBuffer sb=new StringBuffer();
        boolean first=true;
        for(Expression expr:children) {
            if(first) first=false;
            else sb.append(" OR ");
            sb.append("(");
            sb.append(expr.toString());
            sb.append(")");
        }
        return sb.toString();
    }
}