org.springframework.data.rest.webmvc.json.JacksonMetadataUnitTests.java Source code

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/*
 * Copyright 2015-2016 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.data.rest.webmvc.json;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

import java.io.IOException;

import org.junit.Before;
import org.junit.Test;
import org.springframework.data.keyvalue.core.mapping.context.KeyValueMappingContext;
import org.springframework.data.mapping.PersistentEntity;
import org.springframework.data.mapping.PersistentProperty;
import org.springframework.data.mapping.context.MappingContext;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

/**
 * Unit tests for {@link JacksonMetadata}.
 * 
 * @author Oliver Gierke
 * @soundtrack Four Sided Cube - Bad Day's Remembrance (Bunch of Sides)
 */
public class JacksonMetadataUnitTests {

    MappingContext<?, ?> context;
    ObjectMapper mapper;

    @Before
    public void setUp() {

        this.context = new KeyValueMappingContext();

        this.mapper = new ObjectMapper();
        this.mapper.disable(MapperFeature.INFER_PROPERTY_MUTATORS);
    }

    /**
     * @see DATAREST-644
     */
    @Test
    public void detectsReadOnlyProperty() {

        JacksonMetadata metadata = new JacksonMetadata(mapper, User.class);

        PersistentEntity<?, ?> entity = context.getPersistentEntity(User.class);
        PersistentProperty<?> property = entity.getPersistentProperty("username");

        assertThat(metadata.isExported(property), is(true));
        assertThat(metadata.isReadOnly(property), is(true));
    }

    /**
     * @see DATAREST-644
     */
    @Test
    public void reportsConstructorArgumentAsJacksonWritable() {

        JacksonMetadata metadata = new JacksonMetadata(mapper, Value.class);

        PersistentEntity<?, ?> entity = context.getPersistentEntity(Value.class);
        PersistentProperty<?> property = entity.getPersistentProperty("value");

        assertThat(metadata.isReadOnly(property), is(false));
    }

    /**
     * @see DATAREST-644
     */
    @Test
    public void detectsCustomSerializerFortType() {

        JsonSerializer<?> serializer = new JacksonMetadata(new ObjectMapper(), SomeBean.class)
                .getTypeSerializer(SomeBean.class);

        assertThat(serializer, is(instanceOf(SomeBeanSerializer.class)));
    }

    static class User {

        private String username;

        public String getUsername() {
            return username;
        }
    }

    static class Value {

        private String value;

        @JsonCreator
        public Value(@JsonProperty("value") String value) {
            this.value = value;
        }

        public String getValue() {
            return value;
        }
    }

    @JsonSerialize(using = SomeBeanSerializer.class)
    static class SomeBean {
    }

    @SuppressWarnings("serial")
    static class SomeBeanSerializer extends StdSerializer<SomeBean> {

        public SomeBeanSerializer() {
            super(SomeBean.class);
        }

        @Override
        public void serialize(SomeBean value, JsonGenerator gen, SerializerProvider provider) throws IOException {
        }
    }
}