/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.module.extension.internal.runtime.resolver;
import static org.mule.runtime.api.util.Preconditions.checkArgument;
import org.mule.runtime.extension.api.runtime.operation.ExecutionContext;
import org.mule.runtime.extension.api.runtime.parameter.Literal;
/**
* {@link ArgumentResolver} for parameters which are of {@link Literal} type
*
* @param <T> the generic type of the value represented by the literal
* @since 4.0
*/
public class LiteralArgumentResolver<T> implements ArgumentResolver<Literal<T>> {
private final Class<T> expectedType;
private final ByParameterNameArgumentResolver argumentResolver;
public LiteralArgumentResolver(String parameterName, Class<T> expectedType) {
argumentResolver = new ByParameterNameArgumentResolver<>(parameterName);
this.expectedType = expectedType;
}
/**
* {@inheritDoc}
*/
@Override
public Literal<T> resolve(ExecutionContext executionContext) {
Object value = argumentResolver.resolve(executionContext);
if (value instanceof Literal) {
return (Literal<T>) value;
} else if (value == null) {
return null;
}
checkArgument(value instanceof String, "Resolved value was expected to be a String");
return new ImmutableLiteral<>((String) value, expectedType);
}
}