com.tectonica.thirdparty.Jackson2.java Source code

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Here is the source code for com.tectonica.thirdparty.Jackson2.java

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/*
 * Copyright (C) 2014 Zach Melamed
 * 
 * Latest version available online at https://github.com/zach-m/tectonica-commons
 *
 * 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.tectonica.thirdparty;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;

import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.core.io.JsonStringEncoder;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;

/**
 * Convenience wrapper for Jackson APIs version 2.x. Requires:
 * 
 * <pre>
 * &lt;dependency&gt;
 *     &lt;groupId&gt;com.fasterxml.jackson.core&lt;/groupId&gt;
 *     &lt;artifactId&gt;jackson-databind&lt;/artifactId&gt;
 * &lt;/dependency&gt;
 * </pre>
 * 
 * @author Zach Melamed
 */
public class Jackson2 {
    private static final ObjectMapper treeMapper = new ObjectMapper();

    public static JsonNode parse(String jsonObject) {
        try {
            return treeMapper.readValue(jsonObject, JsonNode.class);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static ArrayNode parseArray(String jsonArray) {
        try {
            return treeMapper.readValue(jsonArray, ArrayNode.class);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    // ///////////////////////////////////////////////////////////////////

    public static String escape(String text) {
        return new String(JsonStringEncoder.getInstance().quoteAsUTF8(text));
    }

    // ///////////////////////////////////////////////////////////////////

    private static final ObjectMapper fieldsMapper = createFieldsMapper();
    private static final ObjectMapper propsMapper = createPropsMapper();

    public static ObjectMapper createFieldsMapper() {
        ObjectMapper mapper = new ObjectMapper();

        // limit to fields only
        mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
        mapper.setVisibility(PropertyAccessor.GETTER, Visibility.NONE);
        mapper.setVisibility(PropertyAccessor.SETTER, Visibility.NONE);

        // general configuration
        mapper.setSerializationInclusion(Include.NON_NULL);
        mapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);

        return mapper;
    }

    public static ObjectMapper createPropsMapper() {
        ObjectMapper mapper = new ObjectMapper();

        // limit to props only
        mapper.setVisibility(PropertyAccessor.FIELD, Visibility.NONE);
        mapper.setVisibility(PropertyAccessor.GETTER, Visibility.ANY);
        mapper.setVisibility(PropertyAccessor.SETTER, Visibility.ANY);

        // general configuration
        mapper.setSerializationInclusion(Include.NON_NULL);
        mapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);

        return mapper;
    }

    // ///////////////////////////////////////////////////////////////////

    public static String toJson(Object o, ObjectMapper mapper) {
        try {
            return mapper.writeValueAsString(o);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static void toJson(OutputStream os, Object o, ObjectMapper mapper) {
        try {
            mapper.writeValue(os, o);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static void toJson(Writer w, Object o, ObjectMapper mapper) {
        try {
            mapper.writeValue(w, o);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T fromJson(String jsonStr, Class<T> clz, ObjectMapper mapper) {
        try {
            return mapper.readValue(jsonStr, clz);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T fromJson(InputStream is, Class<T> clz, ObjectMapper mapper) {
        try {
            return mapper.readValue(is, clz);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T fromJson(Reader r, Class<T> clz, ObjectMapper mapper) {
        try {
            return mapper.readValue(r, clz);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T, P> T fromJson(String jsonStr, Class<T> clz, Class<P> paramClz, ObjectMapper mapper) {
        try {
            JavaType jt = mapper.getTypeFactory().constructParametrizedType(clz, clz, paramClz);
            return mapper.readValue(jsonStr, jt);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T, P> T fromJson(InputStream is, Class<T> clz, Class<P> paramClz, ObjectMapper mapper) {
        try {
            JavaType jt = mapper.getTypeFactory().constructParametrizedType(clz, clz, paramClz);
            return mapper.readValue(is, jt);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T, P> T fromJson(Reader r, Class<T> clz, Class<P> paramClz, ObjectMapper mapper) {
        try {
            JavaType jt = mapper.getTypeFactory().constructParametrizedType(clz, clz, paramClz);
            return mapper.readValue(r, jt);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    // ///////////////////////////////////////////////////////////////////

    public static String propsToJson(Object o) {
        return toJson(o, propsMapper);
    }

    public static void propsToJson(OutputStream os, Object o) {
        toJson(os, o, propsMapper);
    }

    public static void propsToJson(Writer w, Object o) {
        toJson(w, o, propsMapper);
    }

    public static <T> T propsFromJson(String jsonStr, Class<T> clz) {
        return fromJson(jsonStr, clz, propsMapper);
    }

    public static <T> T propsFromJson(InputStream is, Class<T> clz) {
        return fromJson(is, clz, propsMapper);
    }

    public static <T> T propsFromJson(Reader r, Class<T> clz) {
        return fromJson(r, clz, propsMapper);
    }

    public static <T, P> T propsFromJson(String jsonStr, Class<T> clz, Class<P> paramClz) {
        return fromJson(jsonStr, clz, paramClz, propsMapper);
    }

    public static <T, P> T propsFromJson(InputStream is, Class<T> clz, Class<P> paramClz) {
        return fromJson(is, clz, paramClz, propsMapper);
    }

    public static <T, P> T propsFromJson(Reader r, Class<T> clz, Class<P> paramClz) {
        return fromJson(r, clz, paramClz, propsMapper);
    }

    public static String fieldsToJson(Object o) {
        return toJson(o, fieldsMapper);
    }

    public static void fieldsToJson(OutputStream os, Object o) {
        toJson(os, o, fieldsMapper);
    }

    public static void fieldsToJson(Writer w, Object o) {
        toJson(w, o, fieldsMapper);
    }

    public static <T> T fieldsFromJson(String jsonStr, Class<T> clz) {
        return fromJson(jsonStr, clz, fieldsMapper);
    }

    public static <T> T fieldsFromJson(InputStream is, Class<T> clz) {
        return fromJson(is, clz, fieldsMapper);
    }

    public static <T> T fieldsFromJson(Reader r, Class<T> clz) {
        return fromJson(r, clz, fieldsMapper);
    }

    public static <T, P> T fieldsFromJson(String jsonStr, Class<T> clz, Class<P> paramClz) {
        return fromJson(jsonStr, clz, paramClz, fieldsMapper);
    }

    public static <T, P> T fieldsFromJson(InputStream is, Class<T> clz, Class<P> paramClz) {
        return fromJson(is, clz, paramClz, fieldsMapper);
    }

    public static <T, P> T fieldsFromJson(Reader r, Class<T> clz, Class<P> paramClz) {
        return fromJson(r, clz, paramClz, fieldsMapper);
    }
}