com.github.tomakehurst.wiremock.extension.ExtensionLoader Maven / Gradle / Ivy

/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.tomakehurst.wiremock.extension;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Maps;

import java.util.Map;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;
import static com.google.common.collect.FluentIterable.from;
import static java.util.Arrays.asList;

public class ExtensionLoader {

    @SuppressWarnings("unchecked")
    public static  Map loadExtension(String... classNames) {
        return (Map) asMap(
                from(asList(classNames))
                        .transform(toClasses())
                        .transform(toExtensions()));
    }

    public static Map load(String... classNames) {
        return loadExtension(classNames);
    }

    public static Map asMap(Iterable extensions) {
        return Maps.uniqueIndex(
                extensions,
                new Function() {
                    public String apply(Extension extension) {
                        return extension.getName();
                    }
                });
    }

    public static Map load(Class... classes) {
        return asMap(from(asList(classes)).transform(toExtensions()));
    }

    private static Function, Extension> toExtensions() {
        return new Function, Extension>() {
            @SuppressWarnings("unchecked")
            public Extension apply(Class extensionClass) {
                try {
                    return extensionClass.newInstance();
                } catch (Exception e) {
                    return throwUnchecked(e, Extension.class);
                }

            }
        };
    }

    private static Function> toClasses() {
        return new Function>() {
            @SuppressWarnings("unchecked")
            public Class apply(String className) {
                try {
                    return (Class) Class.forName(className);
                } catch (ClassNotFoundException e) {
                    return throwUnchecked(e, Class.class);
                }
            }
        };
    }

    public static  Predicate> valueAssignableFrom(final Class extensionType) {
        return new Predicate>() {
            public boolean apply(Map.Entry input) {
                return extensionType.isAssignableFrom(input.getValue().getClass());
            }
        };
    }
}