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Axis2 JSON module
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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.apache.axis2.json;

import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.impl.OMNamespaceImpl;
import org.apache.axiom.om.impl.llom.OMSourcedElementImpl;
import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.builder.Builder;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.transport.http.util.URIEncoderDecoder;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

/** Makes the OMSourcedElementImpl object with the JSONDataSource inside. */

public class JSONOMBuilder implements Builder {


    public JSONOMBuilder() {
    }

    /**
     * gives the OMSourcedElementImpl using the incoming JSON stream
     *
     * @param inputStream - incoming message as an input stream
     * @param contentType - content type of the message (eg: application/json)
     * @param messageContext - inflow message context
     * @return OMSourcedElementImpl with JSONDataSource inside
     * @throws AxisFault
     */

    public OMElement processDocument(InputStream inputStream, String contentType,
                                     MessageContext messageContext) throws AxisFault {
        OMFactory factory = OMAbstractFactory.getOMFactory();
        String localName = "";
        String prefix = "";
        OMNamespace ns = factory.createOMNamespace("", "");

        //if the input stream is null, then check whether the HTTP method is GET, if so get the
        // JSON String which is received as a parameter, and make it an input stream

        if (inputStream == null) {
            EndpointReference endpointReference = messageContext.getTo();
            if (endpointReference == null) {
                throw new AxisFault("Cannot create DocumentElement without destination EPR");
            }

            String requestURL;
            try {
                requestURL = URIEncoderDecoder.decode(endpointReference.getAddress());
            } catch (UnsupportedEncodingException e) {
                throw AxisFault.makeFault(e);
            }

            String jsonString;
            int index;
            //As the message is received through GET, check for "=" sign and consider the second
            //half as the incoming JSON message
            if ((index = requestURL.indexOf("=")) > 0) {
                jsonString = requestURL.substring(index + 1);
                inputStream = new ByteArrayInputStream(jsonString.getBytes());
            } else {
                throw new AxisFault("No JSON message received through HTTP GET or POST");
            }
        }

        /*
        Now we have to read the localname and prefix from the input stream
        if there is not prefix, message starts like {"foo":
        if there is a prefix, message starts like {"prefix:foo":
         */
        try {
            //read the stream until we find a : symbol
            char temp = (char)inputStream.read();
            while (temp != ':') {
                if (temp != ' ' && temp != '{') {
                    localName += temp;
                }
                temp = (char)inputStream.read();
            }

            //if the part we read ends with ", there is no prefix, otherwise it has a prefix
            if (localName.charAt(0) == '"') {
                if (localName.charAt(localName.length() - 1) == '"') {
                    localName = localName.substring(1, localName.length() - 1);
                } else {
                    prefix = localName.substring(1, localName.length()) + ":";
                    localName = "";
                    //so far we have read only the prefix, now lets read the localname
                    temp = (char)inputStream.read();
                    while (temp != ':') {
                        if (temp != ' ') {
                            localName += temp;
                        }
                        temp = (char)inputStream.read();
                    }
                    localName = localName.substring(0, localName.length() - 1);
                }
            }
        } catch (IOException e) {
            throw AxisFault.makeFault(e);
        }
        JSONDataSource jsonDataSource = getDataSource(inputStream, prefix, localName);
        return new OMSourcedElementImpl(localName, ns, factory, jsonDataSource);
    }

    protected JSONDataSource getDataSource(InputStream
            jsonInputStream, String prefix, String localName) {
        return new JSONDataSource(jsonInputStream, "\"" + prefix + localName + "\"");
    }
}