Java SDK Samples - Field Attachments Operations

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package com.zoho.crm.sample.fieldattachments;

import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Map;

import com.zoho.crm.api.ParameterMap;
import com.zoho.crm.api.fieldattachments.APIException;
import com.zoho.crm.api.fieldattachments.FieldAttachmentsOperations;
import com.zoho.crm.api.fieldattachments.FileBodyWrapper;
import com.zoho.crm.api.fieldattachments.ResponseHandler;
import com.zoho.crm.api.util.APIResponse;
import com.zoho.crm.api.util.Model;
import com.zoho.crm.api.util.StreamWrapper;

public class FieldAttachments {
    /*
    *  Get FieldAttachments
     * This method is used to get Field Attachments
     * @param moduleAPIname The module name of the Module
     * @param recordId The record Id of the record
     * @param attachmentID The attachment ID of the attachment
     * @throws Exception
     */
    public static void getFieldAttachments(String destinationFolder,String moduleAPIname,Long recordId,Long attachmentID) throws Exception{
        
        //Get instance of FileOperations Class
        FieldAttachmentsOperations fieldAttachmentsOperations = new FieldAttachmentsOperations(moduleAPIname, recordId, attachmentID);
    
        
        //Call getFile method that takes paramInstance as parameters
        APIResponse response = fieldAttachmentsOperations.getFieldAttachments();
        
        if(response != null)
        {
            //Get the status code from response
            System.out.println("Status Code: " + response.getStatusCode());
            
            if(Arrays.asList(204,304).contains(response.getStatusCode()))
            {
                System.out.println(response.getStatusCode() == 204? "No Content" : "Not Modified");
                return;
            }
            
            //Check if expected response is received
            if(response.isExpected())
            {
                //Get object from response
                ResponseHandler responseHandler = response.getObject();
                
                if(responseHandler instanceof FileBodyWrapper)
                {
                    //Get object from response
                    FileBodyWrapper fileBodyWrapper = (FileBodyWrapper)responseHandler;
                    
                    //Get StreamWrapper instance from the returned FileBodyWrapper instance
                    StreamWrapper streamWrapper = fileBodyWrapper.getFile();
                    
                    //Create a file instance with the absolute_file_path
                    java.io.File file = new java.io.File(destinationFolder + java.io.File.separatorChar + streamWrapper.getName());
                    
                    //Get InputStream from the response
                    InputStream is = streamWrapper.getStream();
                    
                    //Create an OutputStream for the destination file
                    OutputStream os = new FileOutputStream(file);
                    
                    byte[] buffer = new byte[1024];
                    
                    int bytesRead;
                    
                    //read the InputStream till the end
                    while((bytesRead = is.read(buffer)) != -1)
                    {
                        //write data to OutputStream
                        os.write(buffer, 0, bytesRead);
                    }
                    
                    //Close the InputStream
                    is.close();
                    
                    //Flush and close the OutputStream
                    os.flush();
                    
                    os.close();
                }
                //Check if the request returned an exception
                else if(responseHandler instanceof APIException)
                {
                    //Get the received APIException instance
                    APIException exception = (APIException) responseHandler;
                    
                    //Get the Status
                    System.out.println("Status: " + exception.getStatus().getValue());
                    
                    //Get the Code
                    System.out.println("Code: " + exception.getCode().getValue());
                    
                    System.out.println("Details: " );
                    
                    //Get the details map
                    for(Map.Entry entry : exception.getDetails().entrySet())
                    {
                        //Get each value in the map
                        System.out.println(entry.getKey() + ": " + entry.getValue());
                    }
                    
                    //Get the Message
                    System.out.println("Message: " + exception.getMessage().getValue());
                }
            }
            else if(response.getStatusCode() != 204 )
            {//If response is not as expected
                
                //Get model object from response
                Model responseObject = response.getModel();
                
                //Get the response object's class
                Class extends Model> clas = responseObject.getClass();
                
                //Get all declared fields of the response class
                java.lang.reflect.Field[] fields = clas.getDeclaredFields();
                
                for(java.lang.reflect.Field field : fields)
                {
                    //Get each value
                    System.out.println(field.getName() + ":" + field.get(responseObject));
                }
            }
        }
    }
}