RuntimeDelegateImpl.java

/*
 * Copyright 2015 Bounce Storage, Inc. <info@bouncestorage.com>
 *
 * 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.bouncestorage.swiftproxy;

import static java.util.Objects.requireNonNull;

import java.util.Map;
import java.util.Objects;

import javax.ws.rs.core.Application;
import javax.ws.rs.core.Link;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriBuilder;
import javax.ws.rs.core.Variant;
import javax.ws.rs.ext.RuntimeDelegate;

import com.google.common.base.Joiner;

public final class RuntimeDelegateImpl extends RuntimeDelegate {
    private static final MediaTypeProvider MEDIA_TYPE_PROVIDER = new MediaTypeProvider();
    private final RuntimeDelegate delegate;

    RuntimeDelegateImpl(RuntimeDelegate delegate) {
        this.delegate = requireNonNull(delegate);
    }

    @Override
    public UriBuilder createUriBuilder() {
        return delegate.createUriBuilder();
    }

    @Override
    public Response.ResponseBuilder createResponseBuilder() {
        return delegate.createResponseBuilder();
    }

    @Override
    public Variant.VariantListBuilder createVariantListBuilder() {
        return delegate.createVariantListBuilder();
    }

    @Override
    public <T> T createEndpoint(Application application, Class<T> endpointType) throws IllegalArgumentException, UnsupportedOperationException {
        return delegate.createEndpoint(application, endpointType);
    }

    @Override
    public <T> HeaderDelegate<T> createHeaderDelegate(Class<T> type) {
        if (type.equals(MediaType.class)) {
            return (HeaderDelegate<T>) MEDIA_TYPE_PROVIDER;
        } else {
            return delegate.createHeaderDelegate(type);
        }
    }

    @Override
    public Link.Builder createLinkBuilder() {
        return delegate.createLinkBuilder();
    }

    private static final class InvalidMediaType extends MediaType {
        private final String type;

        InvalidMediaType(String type) {
            this.type = requireNonNull(type);
        }

        @Override
        public boolean equals(Object object) {
            if (object == this) {
                return true;
            }
            if (!(object instanceof InvalidMediaType)) {
                return false;
            }
            InvalidMediaType other = (InvalidMediaType) object;
            return super.equals(other) &&
                    Objects.equals(type, other.type);
        }

        @Override
        public int hashCode() {
            return Objects.hash(super.hashCode(), type);
        }

        @Override
        public String toString() {
            StringBuilder res = new StringBuilder(type);
            Map<String, String> params = getParameters();
            if (params != null && !params.isEmpty()) {
                res.append("; ");
                res.append(Joiner.on("; ").withKeyValueSeparator("=").join(params));
            }
            return res.toString();
        }
    }

    private static final class MediaTypeProvider extends org.glassfish.jersey.message.internal.MediaTypeProvider {
        @Override
        public MediaType fromString(String header) {
            try {
                return super.fromString(header);
            } catch (IllegalArgumentException e) {
                return new InvalidMediaType(header);
            }
        }

        @Override
        public String toString(MediaType type) {
            StringBuilder res = new StringBuilder();
            res.append(type.getType()).append('/').append(type.getSubtype());
            Map<String, String> params = type.getParameters();
            if (params != null && !params.isEmpty()) {
                res.append("; ");
                res.append(Joiner.on("; ").withKeyValueSeparator("=").join(params));
            }
            return res.toString();
        }
    }
}