com.github.luluvise.droid_utils.json.jackson.JacksonObjectParser.java Source code

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Here is the source code for com.github.luluvise.droid_utils.json.jackson.JacksonObjectParser.java

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/*
 * Copyright 2013 Luluvise Ltd
 *
 * 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.github.luluvise.droid_utils.json.jackson;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.Type;
import java.nio.charset.Charset;

import javax.annotation.concurrent.Immutable;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.api.client.util.ObjectParser;
import com.google.common.annotations.Beta;

/**
 * Parses JSON data into an data class of key/value pairs.
 * 
 * <p>
 * Implementation is thread-safe.
 * </p>
 * 
 * <p>
 * Sample usage:
 * </p>
 * 
 * <pre>
 * <code>
 *   static void setParser(HttpRequest request) {
 *     request.setParser(new JsonObjectParser(new JacksonFactory()));
 *   }
 * </code>
 * </pre>
 * 
 * @since 1.0
 * @author Marco Salis
 */
@Beta
@Immutable
public class JacksonObjectParser implements ObjectParser {

    private final ObjectMapper mMapper;

    public JacksonObjectParser(ObjectMapper mapper) {
        mMapper = mapper;
    }

    public <T> T parseAndClose(InputStream in, Charset charset, Class<T> dataClass) throws IOException {
        // encoding is automatically detected by ObjectMapper
        return (T) mMapper.readValue(in, dataClass);
    }

    public Object parseAndClose(InputStream in, Charset charset, Type dataType) throws IOException {
        // encoding is automatically detected by ObjectMapper
        // TODO detect if passed class is consistent
        return mMapper.readValue(in, dataType.getClass());
    }

    public <T> T parseAndClose(Reader reader, Class<T> dataClass) throws IOException {
        return (T) mMapper.readValue(reader, dataClass);
    }

    public Object parseAndClose(Reader reader, Type dataType) throws IOException {
        // TODO detect if passed class is consistent
        return mMapper.readValue(reader, dataType.getClass());
    }
}