Jackson.java

/*
 * Copyright 2011-2013 Amazon Technologies, Inc.
 *
 * 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://aws.amazon.com/apache2.0
 *
 * This file 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.amazonaws.util.json;

import java.io.File;
import java.io.IOException;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;

public enum Jackson {
    ;
    private static final ObjectMapper objectMapper = new ObjectMapper();
    static {
        objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
    };
    private static final ObjectWriter writer = objectMapper.writer();
    private static final ObjectWriter prettyWriter = objectMapper.writerWithDefaultPrettyPrinter();
    
    public static String toJsonPrettyString(Object value) {
        try {
            return prettyWriter.writeValueAsString(value);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }

    public static String toJsonString(Object value) {
        try {
            return writer.writeValueAsString(value);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }

    public static <T> T fromJsonString(String json, Class<T> clazz) {
        try {
            return objectMapper.readValue(json, clazz);
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }
    
    public static <T> T loadFrom(File file, Class<T> clazz) throws IOException {
        try {
            return objectMapper.readValue(file, clazz);
        } catch (IOException e) {
            throw e;
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    
    public static ObjectMapper getObjectMapper() {
        return objectMapper;
    }

    public static ObjectWriter getWriter() {
        return writer;
    }

    public static ObjectWriter getPrettywriter() {
        return prettyWriter;
    }
}