ratpack.handling.internal.ChainBuilders.java Source code

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Here is the source code for ratpack.handling.internal.ChainBuilders.java

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/*
 * Copyright 2013 the original author or authors.
 *
 * 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 ratpack.handling.internal;

import com.google.common.collect.Lists;
import ratpack.func.Action;
import ratpack.func.Function;
import ratpack.handling.Handler;
import ratpack.handling.Handlers;
import ratpack.reload.internal.ClassUtil;
import ratpack.reload.internal.ReloadableFileBackedFactory;

import java.io.File;
import java.util.List;

public class ChainBuilders {

    public static <T> Handler build(boolean reloadable, final Function<List<Handler>, ? extends T> toChainBuilder,
            final Action<? super T> chainBuilderAction) throws Exception {
        if (reloadable) {
            File classFile = ClassUtil.getClassFile(chainBuilderAction);
            if (classFile != null) {
                ReloadableFileBackedFactory<Handler> factory = new ReloadableFileBackedFactory<>(classFile.toPath(),
                        true, (file, bytes) -> create(toChainBuilder, chainBuilderAction));
                return new FactoryHandler(factory);
            }
        }

        return create(toChainBuilder, chainBuilderAction);
    }

    private static <T> Handler create(Function<List<Handler>, ? extends T> toChainBuilder,
            Action<? super T> chainBuilderAction) throws Exception {
        List<Handler> handlers = Lists.newLinkedList();
        T chainBuilder = toChainBuilder.apply(handlers);
        chainBuilderAction.execute(chainBuilder);
        return Handlers.chain(handlers.toArray(new Handler[handlers.size()]));
    }

}