com.acme.SyndEntryJsonTransformer.java Source code

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Here is the source code for com.acme.SyndEntryJsonTransformer.java

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/*
 * Copyright 2015 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 com.acme;

import com.fasterxml.jackson.annotation.JsonFilter;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
import com.rometools.rome.feed.synd.SyndEntry;

/**
 * @author David Turanski
 */
@JsonFilter("foreignMarkup filter")
public class SyndEntryJsonTransformer {
    private final ObjectMapper mapper;

    /**
     * Configure ObjectMapper to filter out fields causing serialization problems
     */
    public SyndEntryJsonTransformer() {
        mapper = new ObjectMapper();
        mapper.addMixInAnnotations(SyndEntry.class, this.getClass());
        FilterProvider filterProvider = new SimpleFilterProvider().addFilter("foreignMarkup filter",
                SimpleBeanPropertyFilter.serializeAllExcept("foreignMarkup"));
        mapper.setFilters(filterProvider);
    }

    /**
     * Convert from SyndEntry to JSON string
     * @param entry the SyndEntry
     * @return JSON string
     */
    public String toJson(SyndEntry entry) {
        try {
            return mapper.writer().writeValueAsString(entry);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }
}