com.spotify.apollo.meta.ApplicationOrMetaRouter.java Source code

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Here is the source code for com.spotify.apollo.meta.ApplicationOrMetaRouter.java

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/*
 * -\-\-
 * Spotify Apollo API Implementations
 * --
 * Copyright (C) 2013 - 2015 Spotify AB
 * --
 * 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.spotify.apollo.meta;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;

import com.spotify.apollo.Request;
import com.spotify.apollo.route.ApplicationRouter;
import com.spotify.apollo.route.InvalidUriException;
import com.spotify.apollo.route.RuleMatch;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.Set;

public class ApplicationOrMetaRouter<E> implements ApplicationRouter<E> {
    final ApplicationRouter<E> applicationRouter;
    final ApplicationRouter<E> metaRouter;

    public ApplicationOrMetaRouter(final ApplicationRouter<E> applicationRouter,
            final ApplicationRouter<E> metaRouter) {
        this.applicationRouter = applicationRouter;
        this.metaRouter = metaRouter;
    }

    private static final String META = "/_meta/";

    @Override
    public Optional<RuleMatch<E>> match(Request message) throws InvalidUriException {
        final String uri = message.uri();
        if (isMeta(uri)) {
            return metaRouter.match(message);
        } else {
            return applicationRouter.match(message);
        }
    }

    @VisibleForTesting
    static boolean isMeta(final String uriString) {
        final URI uri;
        try {
            uri = new URI(uriString);
        } catch (URISyntaxException e) {
            return false;
        }
        return uri.getPath().startsWith(META);
    }

    @Override
    public Collection<String> getMethodsForValidRules(Request message) {
        Set<String> union = Sets.newHashSet();
        union.addAll(applicationRouter.getMethodsForValidRules(message));
        union.addAll(metaRouter.getMethodsForValidRules(message));
        return union;
    }

    @Override
    public List<E> getRuleTargets() {
        final ImmutableList.Builder<E> builder = ImmutableList.builder();

        builder.addAll(applicationRouter.getRuleTargets());
        builder.addAll(metaRouter.getRuleTargets());

        return builder.build();
    }
}