org.camunda.spin.impl.json.jackson.format.JacksonJsonDataFormatReader.java Source code

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Here is the source code for org.camunda.spin.impl.json.jackson.format.JacksonJsonDataFormatReader.java

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/* 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.camunda.spin.impl.json.jackson.format;

import java.io.IOException;
import java.io.Reader;
import java.util.regex.Pattern;

import org.camunda.spin.impl.json.jackson.JacksonJsonLogger;
import org.camunda.spin.spi.TextBasedDataFormatReader;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * @author Thorben Lindhauer
 */
public class JacksonJsonDataFormatReader extends TextBasedDataFormatReader {

    private static final JacksonJsonLogger JSON_LOGGER = JacksonJsonLogger.JSON_TREE_LOGGER;
    private static final Pattern INPUT_MATCHING_PATTERN = Pattern.compile("\\A(\\s)*[{\\[]");

    protected JacksonJsonDataFormat format;

    public JacksonJsonDataFormatReader(JacksonJsonDataFormat format) {
        this.format = format;
    }

    public Object readInput(Reader input) {
        ObjectMapper mapper = format.getObjectMapper();

        try {
            return mapper.readTree(input);
        } catch (JsonProcessingException e) {
            throw JSON_LOGGER.unableToParseInput(e);
        } catch (IOException e) {
            throw JSON_LOGGER.unableToParseInput(e);
        }
    }

    protected Pattern getInputDetectionPattern() {
        return INPUT_MATCHING_PATTERN;
    }

}