/*
* Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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.wso2.carbon.mediator.datamapper.engine.input.readers;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.mediator.datamapper.engine.core.exceptions.JSException;
import org.wso2.carbon.mediator.datamapper.engine.core.exceptions.ReaderException;
import org.wso2.carbon.mediator.datamapper.engine.core.exceptions.SchemaException;
import org.wso2.carbon.mediator.datamapper.engine.core.schemas.Schema;
import org.wso2.carbon.mediator.datamapper.engine.input.InputBuilder;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
/**
* This class is capable of parsing XML through AXIOMS for the InputStream and build the respective JSON message
*/
public class JSONInputReader implements InputReader {
private static final Log log = LogFactory.getLog(JSONInputReader.class);
/**
* Constructor
*
* @throws IOException
*/
public JSONInputReader() throws IOException {
}
/**
* Read, parse the XML and notify with the output JSON message
*
* @param input XML message InputStream
* @param inputSchema Schema of the input message
* @param messageBuilder Reference of the InputXMLMessageBuilder
* @throws ReaderException Exceptions in the parsing stage
*/
@Override
public void read(InputStream input, Schema inputSchema, InputBuilder messageBuilder) throws ReaderException {
String inputJSONMessage;
try {
inputJSONMessage = readFromInputStream(input);
messageBuilder.notifyWithResult(inputJSONMessage);
} catch (IOException | JSException | SchemaException e) {
throw new ReaderException("Error while reading input stream. " + e.getMessage());
}
}
/**
* Method added to convert the input directly into a string and to return
* This method is used only when the JSON input is present
*
* @param inputStream JSON message as a InputStream
* @return JSON message as a String
* @throws IOException
*/
private String readFromInputStream(InputStream inputStream) throws IOException {
InputStreamReader isr = new InputStreamReader((inputStream));
BufferedReader br = new BufferedReader(isr);
StringBuilder out = new StringBuilder("");
String line;
try {
while ((line = br.readLine()) != null) {
out.append(line);
}
} finally {
br.close();
isr.close();
}
return out.toString();
}
}