Examples with NullExpression org.apache.camel.language.simple.ast.NullExpression used on opensource projects

Example 1 with NullExpression

use of org.apache.camel.language.simple.ast.NullExpression in project camel by apache.

the class SimplePredicateParser method createNode.

/**
     * Creates a node from the given token
     *
     * @param token         the token
     * @param startSingle   state of single quoted blocks
     * @param startDouble   state of double quoted blocks
     * @param startFunction state of function blocks
     * @return the created node, or <tt>null</tt> to let a default node be created instead.
     */
private SimpleNode createNode(SimpleToken token, AtomicBoolean startSingle, AtomicBoolean startDouble, AtomicBoolean startFunction) {
    if (token.getType().isFunctionStart()) {
        startFunction.set(true);
        return new SimpleFunctionStart(token);
    } else if (token.getType().isFunctionEnd()) {
        startFunction.set(false);
        return new SimpleFunctionEnd(token);
    }
    // as we want all the tokens to be literal instead
    if (startFunction.get()) {
        return null;
    }
    // okay so far we also want to support quotes
    if (token.getType().isSingleQuote()) {
        SimpleNode answer;
        boolean start = startSingle.get();
        if (!start) {
            answer = new SingleQuoteStart(token);
        } else {
            answer = new SingleQuoteEnd(token);
        }
        // flip state on start/end flag
        startSingle.set(!start);
        return answer;
    } else if (token.getType().isDoubleQuote()) {
        SimpleNode answer;
        boolean start = startDouble.get();
        if (!start) {
            answer = new DoubleQuoteStart(token);
        } else {
            answer = new DoubleQuoteEnd(token);
        }
        // flip state on start/end flag
        startDouble.set(!start);
        return answer;
    }
    // as we want to only support embedded functions and all other kinds to be literal tokens
    if (startSingle.get() || startDouble.get()) {
        return null;
    }
    // and the special null value as well
    if (token.getType().isUnary()) {
        return new UnaryExpression(token);
    } else if (token.getType().isBinary()) {
        return new BinaryExpression(token);
    } else if (token.getType().isLogical()) {
        return new LogicalExpression(token);
    } else if (token.getType().isNullValue()) {
        return new NullExpression(token);
    }
    // by returning null, we will let the parser determine what to do
    return null;
}