ActivityUtil.java

/*
 * 2012-3 Red Hat Inc. and/or its affiliates and other contributors.
 *
 * 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.overlord.rtgov.activity.util;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.type.TypeReference;
import org.overlord.rtgov.activity.model.ActivityType;
import org.overlord.rtgov.activity.model.ActivityUnit;
import org.overlord.rtgov.activity.server.QuerySpec;

/**
 * This class provides utility functions for the activity
 * model.
 *
 */
public final class ActivityUtil {
    
    protected static final ObjectMapper MAPPER=new ObjectMapper();

    private static final TypeReference<java.util.List<ActivityUnit>> ACTIVITY_UNIT_LIST=
            new TypeReference<java.util.List<ActivityUnit>>() { };
    private static final TypeReference<java.util.List<ActivityType>> ACTIVITY_TYPE_LIST=
            new TypeReference<java.util.List<ActivityType>>() { };
    
    private static ObjectWriter ATLIST_WRITER=null;

    static {
        MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        MAPPER.setSerializationInclusion(JsonInclude.Include.NON_DEFAULT);
        
        ATLIST_WRITER = MAPPER.writerWithType(ACTIVITY_TYPE_LIST);
    }
    
    /**
     * Private constructor.
     */
    private ActivityUtil() {
    }
    
    /**
     * This method serializes an Activity event into a JSON representation.
     * 
     * @param act The activity
     * @return The JSON serialized representation
     * @throws Exception Failed to serialize
     */
    public static byte[] serializeActivityUnit(ActivityUnit act) throws Exception {
        byte[] ret=null;
        
        java.io.ByteArrayOutputStream baos=new java.io.ByteArrayOutputStream();
        
        MAPPER.writeValue(baos, act);
        
        ret = baos.toByteArray();
        
        baos.close();
        
        return (ret);
    }

    /**
     * This method serializes a Query Spec into a JSON representation.
     * 
     * @param qs The query spec
     * @return The JSON serialized representation
     * @throws Exception Failed to serialize
     */
    public static byte[] serializeQuerySpec(QuerySpec qs) throws Exception {
        byte[] ret=null;
        
        java.io.ByteArrayOutputStream baos=new java.io.ByteArrayOutputStream();
        
        MAPPER.writeValue(baos, qs);
        
        ret = baos.toByteArray();
        
        baos.close();
        
        return (ret);
    }

    /**
     * This method serializes an object into a JSON string representation.
     * 
     * @param obj The object
     * @return The JSON serialized string representation
     * @throws Exception Failed to serialize
     */
    public static String objectToJSONString(Object obj) throws Exception {
        String ret=null;
        
        java.io.ByteArrayOutputStream baos=new java.io.ByteArrayOutputStream();
        
        MAPPER.writeValue(baos, obj);
        
        ret = new String(baos.toByteArray());
        
        baos.close();
        
        return (ret);
    }

    /**
     * This method serializes an ActivityUnit  list into a JSON representation.
     * 
     * @param activities The activity unit list
     * @return The JSON serialized representation
     * @throws Exception Failed to serialize
     */
    public static byte[] serializeActivityUnitList(java.util.List<ActivityUnit> activities) throws Exception {
        byte[] ret=null;
        
        java.io.ByteArrayOutputStream baos=new java.io.ByteArrayOutputStream();
        
        MAPPER.writeValue(baos, activities);
        
        ret = baos.toByteArray();
        
        baos.close();
        
        return (ret);
    }

    /**
     * This method serializes an ActivityType event list into a JSON representation.
     * 
     * @param activities The activity type list
     * @return The JSON serialized representation
     * @throws Exception Failed to serialize
     */
    public static byte[] serializeActivityTypeList(java.util.List<ActivityType> activities) throws Exception {
        byte[] ret=null;
        
        java.io.ByteArrayOutputStream baos=new java.io.ByteArrayOutputStream();
        
        ATLIST_WRITER.writeValue(baos, activities);
        
        ret = baos.toByteArray();
        
        baos.close();
        
        return (ret);
    }

    /**
     * This method deserializes an Activity event from a JSON representation.
     * 
     * @param act The JSON representation of the activity
     * @return The Activity event
     * @throws Exception Failed to deserialize
     */
    public static ActivityUnit deserializeActivityUnit(byte[] act) throws Exception {
        ActivityUnit ret=null;
        
        java.io.ByteArrayInputStream bais=new java.io.ByteArrayInputStream(act);
        
        ret = MAPPER.readValue(bais, ActivityUnit.class);
        
        bais.close();
        
        return (ret);
    }

    /**
     * This method deserializes a Query Spec from a JSON representation.
     * 
     * @param qs The JSON representation of the query spec
     * @return The query spec
     * @throws Exception Failed to deserialize
     */
    public static QuerySpec deserializeQuerySpec(byte[] qs) throws Exception {
        QuerySpec ret=null;
        
        java.io.ByteArrayInputStream bais=new java.io.ByteArrayInputStream(qs);
        
        ret = MAPPER.readValue(bais, QuerySpec.class);
        
        bais.close();
        
        return (ret);
    }

    /**
     * This method deserializes an Activity Unit list from a JSON representation.
     * 
     * @param act The JSON representation of the activity
     * @return The ActivityUnit event list
     * @throws Exception Failed to deserialize
     */
    public static java.util.List<ActivityUnit> deserializeActivityUnitList(byte[] act) throws Exception {
        java.util.List<ActivityUnit> ret=null;
        
        java.io.ByteArrayInputStream bais=new java.io.ByteArrayInputStream(act);
        
        ret = MAPPER.readValue(bais, ACTIVITY_UNIT_LIST);
        
        bais.close();
        
        return (ret);
    }

    /**
     * This method deserializes an ActivityType event list from a JSON representation.
     * 
     * @param act The JSON representation of the activity
     * @return The ActivityType event list
     * @throws Exception Failed to deserialize
     */
    public static java.util.List<ActivityType> deserializeActivityTypeList(byte[] act) throws Exception {
        java.util.List<ActivityType> ret=null;
        
        java.io.ByteArrayInputStream bais=new java.io.ByteArrayInputStream(act);
        
        ret = MAPPER.readValue(bais, ACTIVITY_TYPE_LIST);
        
        bais.close();
        
        return (ret);
    }
}