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Default implementation of the Mule Extension API.

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/*
 * 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.module.extension.internal;

import static org.mule.util.Preconditions.checkArgument;
import org.mule.extension.introspection.declaration.DescribingContext;
import org.mule.extension.introspection.declaration.fluent.DeclarationDescriptor;

import java.util.HashMap;
import java.util.Map;

/**
 * Default implementation of {@link DescribingContext}.
 * The fact that this class's attributes are immutable, doesn't mean that their inner state
 * is in fact immutable also.
 *
 * @since 3.7.0
 */
public final class DefaultDescribingContext implements DescribingContext
{

    private final DeclarationDescriptor declarationDescriptor;
    private final Map customParameters = new HashMap<>();

    public DefaultDescribingContext(DeclarationDescriptor declarationDescriptor)
    {
        this.declarationDescriptor = declarationDescriptor;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public DeclarationDescriptor getDeclarationDescriptor()
    {
        return declarationDescriptor;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Map getCustomParameters()
    {
        return customParameters;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public  T getCheckedParameter(String key, Class expectedType)
    {
        Object parameter = getCustomParameters().get(key);
        if (parameter == null)
        {
            return null;
        }

        checkArgument(expectedType.isInstance(parameter),
                      String.format("Custom parameter '%s' was expected to be of class '%s' but got '%s' instead",
                                    key,
                                    expectedType.getName(),
                                    parameter.getClass().getName()));

        return (T) parameter;
    }
}