Example usage for org.springframework.expression.spel.ast SpelNodeImpl isCompilable

Introduction

In this page you can find the example usage for org.springframework.expression.spel.ast SpelNodeImpl isCompilable.

Prototype

public boolean isCompilable() 

Source Link

Document

Check whether a node can be compiled to bytecode.

Usage

From source file:org.springframework.expression.spel.standard.SpelCompiler.java

/**
 * Attempt compilation of the supplied expression. A check is made to see
 * if it is compilable before compilation proceeds. The check involves
 * visiting all the nodes in the expression Ast and ensuring enough state
 * is known about them that bytecode can be generated for them.
 * @param expression the expression to compile
 * @return an instance of the class implementing the compiled expression,
 * or {@code null} if compilation is not possible
 *//* w ww. j  a  va2 s .  c  o  m*/
@Nullable
public CompiledExpression compile(SpelNodeImpl expression) {
    if (expression.isCompilable()) {
        if (logger.isDebugEnabled()) {
            logger.debug("SpEL: compiling " + expression.toStringAST());
        }
        Class<? extends CompiledExpression> clazz = createExpressionClass(expression);
        if (clazz != null) {
            try {
                return ReflectionUtils.accessibleConstructor(clazz).newInstance();
            } catch (Throwable ex) {
                throw new IllegalStateException("Failed to instantiate CompiledExpression", ex);
            }
        }
    }

    if (logger.isDebugEnabled()) {
        logger.debug("SpEL: unable to compile " + expression.toStringAST());
    }
    return null;
}

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