001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2024-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.web;
019
020import com.google.common.util.concurrent.ListenableFuture;
021
022import dev.enola.common.io.resource.ReadableResource;
023
024import java.net.URI;
025import java.util.ArrayList;
026import java.util.List;
027
028public class WebHandlers implements WebHandler {
029
030    // TODO Rename WebHandlers to dev.enola.common.net.http.HttpHandlers
031
032    private final List<PrefixHandlerPair> pairs = new ArrayList<>();
033
034    public WebHandlers register(String prefix, WebHandler handler) {
035        pairs.add(new PrefixHandlerPair(prefix, handler));
036        return this;
037    }
038
039    @Override
040    public ListenableFuture<ReadableResource> handle(URI uri) {
041        var path = uri.getPath();
042        for (var entry : pairs) {
043            if (path.startsWith(entry.prefix)) return entry.handler.handle(uri);
044        }
045        throw new IllegalStateException(
046                "Missing handler registration, add a last entry with empty prefix as default"
047                        + " handler; for: "
048                        + uri);
049    }
050
051    private record PrefixHandlerPair(String prefix, WebHandler handler) {}
052}