org.springframework.boot.web.client.RootUriTemplateHandler.java Source code

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Here is the source code for org.springframework.boot.web.client.RootUriTemplateHandler.java

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/*
 * Copyright 2012-2019 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
 *
 *      https://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 org.springframework.boot.web.client;

import java.net.URI;
import java.util.Map;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.DefaultUriBuilderFactory;
import org.springframework.web.util.UriTemplateHandler;

/**
 * {@link UriTemplateHandler} to set the root for URI that starts with {@code '/'}.
 *
 * @author Phillip Webb
 * @since 1.4.0
 */
public class RootUriTemplateHandler implements UriTemplateHandler {

    private final String rootUri;

    private final UriTemplateHandler handler;

    protected RootUriTemplateHandler(UriTemplateHandler handler) {
        Assert.notNull(handler, "Handler must not be null");
        this.rootUri = null;
        this.handler = handler;
    }

    /**
     * Create a new {@link RootUriTemplateHandler} instance.
     * @param rootUri the root URI to be used to prefix relative URLs
     */
    public RootUriTemplateHandler(String rootUri) {
        this(rootUri, new DefaultUriBuilderFactory());
    }

    /**
     * Create a new {@link RootUriTemplateHandler} instance.
     * @param rootUri the root URI to be used to prefix relative URLs
     * @param handler the delegate handler
     */
    public RootUriTemplateHandler(String rootUri, UriTemplateHandler handler) {
        Assert.notNull(rootUri, "RootUri must not be null");
        Assert.notNull(handler, "Handler must not be null");
        this.rootUri = rootUri;
        this.handler = handler;
    }

    @Override
    public URI expand(String uriTemplate, Map<String, ?> uriVariables) {
        return this.handler.expand(apply(uriTemplate), uriVariables);
    }

    @Override
    public URI expand(String uriTemplate, Object... uriVariables) {
        return this.handler.expand(apply(uriTemplate), uriVariables);
    }

    private String apply(String uriTemplate) {
        if (StringUtils.startsWithIgnoreCase(uriTemplate, "/")) {
            return getRootUri() + uriTemplate;
        }
        return uriTemplate;
    }

    public String getRootUri() {
        return this.rootUri;
    }

    /**
     * Add a {@link RootUriTemplateHandler} instance to the given {@link RestTemplate}.
     * @param restTemplate the {@link RestTemplate} to add the handler to
     * @param rootUri the root URI
     * @return the added {@link RootUriTemplateHandler}.
     */
    public static RootUriTemplateHandler addTo(RestTemplate restTemplate, String rootUri) {
        Assert.notNull(restTemplate, "RestTemplate must not be null");
        RootUriTemplateHandler handler = new RootUriTemplateHandler(rootUri, restTemplate.getUriTemplateHandler());
        restTemplate.setUriTemplateHandler(handler);
        return handler;
    }

}