GenericArtifactMessageBodyReader.java

/*
 * Copyright (c) 2015, 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.governance.rest.api.internal;

import com.google.gson.stream.JsonReader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.governance.api.common.dataobjects.GovernanceArtifact;
import org.wso2.carbon.governance.api.exception.GovernanceException;
import org.wso2.carbon.governance.api.generic.GenericArtifactManager;
import org.wso2.carbon.governance.api.generic.dataobjects.GenericArtifact;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.MessageBodyReader;
import javax.xml.namespace.QName;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class GenericArtifactMessageBodyReader extends JSONMessageBodyReader
        implements MessageBodyReader<GovernanceArtifact> {

    private final Log log = LogFactory.getLog(GenericArtifactMessageBodyReader.class);

    private static final String OVERVIEW_PREFIX = "overview_";
    private static final String UNBOUNDED_SUFFIX = "unbounded";
    private static final String RXT_SEPARATOR = "_";
    private static final String ATTR_NAME = "name";
    private static final String ATTR_TYPE = "type";
    private static final String UTF_8 = "UTF-8";

    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        if (GenericArtifact.class.getName().equals(type.getName()) || GovernanceArtifact.class.getName().
                equals(type.getName())) {
            if (MediaType.APPLICATION_JSON_TYPE.equals(mediaType) || MediaType.APPLICATION_XML_TYPE.equals(mediaType)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public GovernanceArtifact readFrom(Class<GovernanceArtifact> type, Type genericType, Annotation[] annotations,
                                    MediaType mediaType, MultivaluedMap<String, String> httpHeaders,
                                    InputStream entityStream) throws IOException, WebApplicationException {
        JsonReader reader = new JsonReader(new InputStreamReader(entityStream, UTF_8));
        Map<String, Object> map = new HashMap<>();
        reader.setLenient(true);
        handleJSON(reader, map);
        try {
            return createGenericArtifact(map);
        } catch (GovernanceException e) {
            log.error(e);
            throw new WebApplicationException(Response.Status.BAD_REQUEST);
        }
    }

    private GovernanceArtifact createGenericArtifact(Map<String, Object> map) throws GovernanceException {
        String name = (String) map.get(ATTR_NAME);
        String type = (String) map.get(ATTR_TYPE);
        if (name != null && !name.isEmpty() && type != null && !type.isEmpty()) {
            GovernanceArtifact artifact = GenericArtifactManager.newDetachedGovernanceArtifact(new QName(name), type);
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                String key = entry.getKey();
                if (key.endsWith(UNBOUNDED_SUFFIX)) {
                    key = key.substring(0, key.indexOf(UNBOUNDED_SUFFIX));
                }
                if (!key.contains(RXT_SEPARATOR)) {
                    key = OVERVIEW_PREFIX.concat(key);
                }

                /*
                 * Fix for REGISTRY-3613
                 * Enabling multiple values with the same key to be added as attributes in order to save
                 * unbounded elements such as endpoints.
                 */
                Object value = entry.getValue();

                if (value instanceof String) {
                    artifact.addAttribute(key, String.valueOf(value));
                } else if (value instanceof Map) {
                    //if value is a json array with multiple values
                    Map<?,?> arrayMap = (Map) value;
                    for (Map.Entry arrayEntry : arrayMap.entrySet()) {
                        String tempKey = key.concat((String) arrayEntry.getKey());
                        List arrayValues = (List) arrayEntry.getValue();

                        for (Object val : arrayValues) {
                            artifact.addAttribute(tempKey, String.valueOf(val));
                        }
                    }
                }

            }
            return artifact;
        }
        throw new GovernanceException("Can't create GenericArtifact from source");
    }
}