/*
* Copyright 2012-2017 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 org.springframework.boot.test.json;
import java.io.File;
import java.io.InputStream;
import java.nio.charset.Charset;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
/**
* AssertJ based JSON tester that works with basic JSON strings. Allows testing of JSON
* payloads created from any source, for example:<pre class="code">
* public class ExampleObjectJsonTests {
*
* private BasicJsonTester json = new BasicJsonTester(getClass());
*
* @Test
* public void testWriteJson() throws IOException {
* assertThat(json.from("example.json")).extractingJsonPathStringValue("@.name")
.isEqualTo("Spring");
* }
*
* }
* </pre>
*
* See {@link AbstractJsonMarshalTester} for more details.
*
* @author Phillip Webb
* @author Andy Wilkinson
* @since 1.4.0
*/
public class BasicJsonTester {
private JsonLoader loader;
/**
* Create a new uninitialized {@link BasicJsonTester} instance.
*/
protected BasicJsonTester() {
}
/**
* Create a new {@link BasicJsonTester} instance that will load resources as UTF-8.
* @param resourceLoadClass the source class used to load resources
*/
public BasicJsonTester(Class<?> resourceLoadClass) {
this(resourceLoadClass, null);
}
/**
* Create a new {@link BasicJsonTester} instance.
* @param resourceLoadClass the source class used to load resources
* @param charset the charset used to load resources
* @since 1.4.1
*/
public BasicJsonTester(Class<?> resourceLoadClass, Charset charset) {
Assert.notNull(resourceLoadClass, "ResourceLoadClass must not be null");
this.loader = new JsonLoader(resourceLoadClass, charset);
}
/**
* Initialize the marshal tester for use, configuring it to load JSON resources as
* UTF-8.
* @param resourceLoadClass the source class used when loading relative classpath
* resources
* @param type the type under test
*/
protected final void initialize(Class<?> resourceLoadClass, ResolvableType type) {
this.initialize(resourceLoadClass, null, type);
}
/**
* Initialize the marshal tester for use.
* @param resourceLoadClass the source class used when loading relative classpath
* resources
* @param charset the charset used when loading relative classpath resources
* @param type the type under test
* @since 1.4.1
*/
protected final void initialize(Class<?> resourceLoadClass, Charset charset,
ResolvableType type) {
if (this.loader == null) {
this.loader = new JsonLoader(resourceLoadClass, charset);
}
}
/**
* Create JSON content from the specified String source. The source can contain the
* JSON itself or, if it ends with {@code .json}, the name of a resource to be loaded
* using {@code resourceLoadClass}.
* @param source JSON content or a {@code .json} resource name
* @return the JSON content
*/
public JsonContent<Object> from(CharSequence source) {
verify();
return getJsonContent(this.loader.getJson(source));
}
/**
* Create JSON content from the specified resource path.
* @param path the path of the resource to load
* @param resourceLoadClass the source class used to load the resource
* @return the JSON content
*/
public JsonContent<Object> from(String path, Class<?> resourceLoadClass) {
verify();
return getJsonContent(this.loader.getJson(path, resourceLoadClass));
}
/**
* Create JSON content from the specified JSON bytes.
* @param source the bytes of JSON
* @return the JSON content
*/
public JsonContent<Object> from(byte[] source) {
verify();
return getJsonContent(this.loader.getJson(source));
}
/**
* Create JSON content from the specified JSON file.
* @param source the file containing JSON
* @return the JSON content
*/
public JsonContent<Object> from(File source) {
verify();
return getJsonContent(this.loader.getJson(source));
}
/**
* Create JSON content from the specified JSON input stream.
* @param source the input stream containing JSON
* @return the JSON content
*/
public JsonContent<Object> from(InputStream source) {
verify();
return getJsonContent(this.loader.getJson(source));
}
/**
* Create JSON content from the specified JSON resource.
* @param source the resource containing JSON
* @return the JSON content
*/
public JsonContent<Object> from(Resource source) {
verify();
return getJsonContent(this.loader.getJson(source));
}
private void verify() {
Assert.state(this.loader != null, "Uninitialized BasicJsonTester");
}
private JsonContent<Object> getJsonContent(String json) {
return new JsonContent<>(this.loader.getResourceLoadClass(), null, json);
}
}