io.atlassian.util.adapter.javax.servlet.jsp.el.JavaXExpressionAdapter Maven / Gradle / Ivy

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A collection of classes for adapting Servlet API 4.0 objects to Servlet API 5.0 and vice versa.

There is a newer version: 0.1.0

package io.atlassian.util.adapter.javax.servlet.jsp.el;

import io.atlassian.util.adapter.jakarta.servlet.jsp.el.JakartaExpressionAdapter;
import io.atlassian.util.adapter.jakarta.servlet.jsp.el.JakartaVariableResolverAdapter;

import javax.servlet.jsp.el.ELException;
import javax.servlet.jsp.el.Expression;
import javax.servlet.jsp.el.VariableResolver;

import static io.atlassian.util.adapter.util.WrapperUtil.applyIfNonNull;
import static java.util.Objects.requireNonNull;

public class JavaXExpressionAdapter extends Expression {

    private final jakarta.servlet.jsp.el.Expression delegate;

    public static Expression from(jakarta.servlet.jsp.el.Expression delegate) {
        if (delegate instanceof JakartaExpressionAdapter castDelegate) {
            return castDelegate.getDelegate();
        }
        return applyIfNonNull(delegate, JavaXExpressionAdapter::new);
    }

    JavaXExpressionAdapter(jakarta.servlet.jsp.el.Expression delegate) {
        this.delegate = requireNonNull(delegate);
    }

    public jakarta.servlet.jsp.el.Expression getDelegate() {
        return delegate;
    }

    @Override
    public Object evaluate(VariableResolver variableResolver) throws ELException {
        try {
            return delegate.evaluate(JakartaVariableResolverAdapter.from(variableResolver));
        } catch (jakarta.servlet.jsp.el.ELException e) {
            throw new ELException(e);
        }
    }
}