Portlet Framework

/**
 * Base portlet implementation providing common portlet functionality
 */
public abstract class BasePortlet implements Portlet {
    
    /**
     * Initializes the portlet with portal-specific configuration
     * @param portletConfig portlet configuration
     * @throws PortletException if initialization fails
     */
    @Override
    public void init(PortletConfig portletConfig) throws PortletException;
    
    /**
     * Processes action requests from portlet forms
     * @param actionRequest portlet action request
     * @param actionResponse portlet action response
     * @throws PortletException if action processing fails
     * @throws IOException if I/O error occurs
     */
    @Override
    public void processAction(ActionRequest actionRequest, ActionResponse actionResponse)
        throws PortletException, IOException;
    
    /**
     * Renders portlet content for display
     * @param renderRequest portlet render request
     * @param renderResponse portlet render response
     * @throws PortletException if rendering fails
     * @throws IOException if I/O error occurs
     */
    @Override
    public void render(RenderRequest renderRequest, RenderResponse renderResponse)
        throws PortletException, IOException;
    
    /**
     * Cleans up portlet resources
     */
    @Override
    public void destroy();
}

/**
 * Portlet container managing portlet lifecycle and execution
 */
public class PortletContainer {
    
    /**
     * Deploys portlet application
     * @param portletApp portlet application descriptor
     * @throws PortletException if deployment fails
     */
    public void deployPortlet(PortletApp portletApp) throws PortletException;
    
    /**
     * Undeploys portlet application
     * @param portletName portlet name to undeploy
     * @throws PortletException if undeployment fails
     */
    public void undeployPortlet(String portletName) throws PortletException;
    
    /**
     * Gets deployed portlet instance
     * @param portletName portlet name
     * @return Portlet instance or null if not found
     */
    public Portlet getPortlet(String portletName);
    
    /**
     * Lists all deployed portlets
     * @return Set of deployed portlet names
     */
    public Set<String> getDeployedPortlets();
}

/**
 * Asset entry representing any content asset in the portal
 */
public class AssetEntry {
    
    /**
     * Gets asset entry ID
     * @return asset entry ID
     */
    public long getEntryId();
    
    /**
     * Gets asset title
     * @return asset title
     */
    public String getTitle();
    
    /**
     * Sets asset title
     * @param title asset title
     */
    public void setTitle(String title);
    
    /**
     * Gets asset description
     * @return asset description
     */
    public String getDescription();
    
    /**
     * Sets asset description
     * @param description asset description
     */
    public void setDescription(String description);
    
    /**
     * Gets asset categories
     * @return List of asset categories
     */
    public List<AssetCategory> getCategories();
    
    /**
     * Gets asset tags
     * @return List of asset tags
     */
    public List<AssetTag> getTags();
}

/**
 * Asset service for managing content assets
 */
public interface AssetEntryService {
    
    /**
     * Adds new asset entry
     * @param className asset class name
     * @param classPK asset class primary key
     * @param title asset title
     * @param description asset description
     * @param serviceContext service context
     * @return created AssetEntry
     * @throws PortalException if creation fails
     */
    AssetEntry addEntry(String className, long classPK, String title, String description,
        ServiceContext serviceContext) throws PortalException;
    
    /**
     * Updates existing asset entry
     * @param entryId asset entry ID
     * @param title updated title
     * @param description updated description
     * @param serviceContext service context
     * @return updated AssetEntry
     * @throws PortalException if update fails
     */
    AssetEntry updateEntry(long entryId, String title, String description,
        ServiceContext serviceContext) throws PortalException;
    
    /**
     * Deletes asset entry
     * @param entryId asset entry ID
     * @throws PortalException if deletion fails
     */
    void deleteEntry(long entryId) throws PortalException;
    
    /**
     * Searches for asset entries
     * @param keywords search keywords
     * @param categoryIds category filter IDs
     * @param tagNames tag filter names
     * @return List of matching AssetEntry objects
     */
    List<AssetEntry> searchEntries(String keywords, long[] categoryIds, String[] tagNames);
}

/**
 * Document library folder for organizing documents
 */
public class DLFolder {
    
    /**
     * Gets folder ID
     * @return folder ID
     */
    public long getFolderId();
    
    /**
     * Gets folder name
     * @return folder name
     */
    public String getName();
    
    /**
     * Sets folder name
     * @param name folder name
     */
    public void setName(String name);
    
    /**
     * Gets parent folder ID
     * @return parent folder ID
     */
    public long getParentFolderId();
    
    /**
     * Gets folder description
     * @return folder description
     */
    public String getDescription();
}

/**
 * Document library file entry representing uploaded documents
 */
public class DLFileEntry {
    
    /**
     * Gets file entry ID
     * @return file entry ID
     */
    public long getFileEntryId();
    
    /**
     * Gets file name
     * @return file name
     */
    public String getFileName();
    
    /**
     * Gets file title
     * @return file title
     */
    public String getTitle();
    
    /**
     * Gets file MIME type
     * @return MIME type
     */
    public String getMimeType();
    
    /**
     * Gets file size in bytes
     * @return file size
     */
    public long getSize();
    
    /**
     * Gets file version
     * @return version string
     */
    public String getVersion();
    
    /**
     * Gets file content as input stream
     * @return InputStream for file content
     * @throws IOException if content cannot be accessed
     */
    public InputStream getContentStream() throws IOException;
}

/**
 * Document library service for managing documents
 */
public interface DLFileEntryService {
    
    /**
     * Adds new file entry
     * @param folderId parent folder ID
     * @param fileName file name
     * @param mimeType MIME type
     * @param title file title
     * @param description file description
     * @param changeLog change log message
     * @param bytes file content bytes
     * @param serviceContext service context
     * @return created DLFileEntry
     * @throws PortalException if creation fails
     */
    DLFileEntry addFileEntry(long folderId, String fileName, String mimeType,
        String title, String description, String changeLog, byte[] bytes,
        ServiceContext serviceContext) throws PortalException;
    
    /**
     * Updates file entry content
     * @param fileEntryId file entry ID
     * @param fileName updated file name
     * @param mimeType updated MIME type
     * @param title updated title
     * @param description updated description
     * @param changeLog change log message
     * @param bytes updated file content
     * @param serviceContext service context
     * @return updated DLFileEntry
     * @throws PortalException if update fails
     */
    DLFileEntry updateFileEntry(long fileEntryId, String fileName, String mimeType,
        String title, String description, String changeLog, byte[] bytes,
        ServiceContext serviceContext) throws PortalException;
    
    /**
     * Deletes file entry
     * @param fileEntryId file entry ID
     * @throws PortalException if deletion fails
     */
    void deleteFileEntry(long fileEntryId) throws PortalException;
    
    /**
     * Gets file entries in folder
     * @param folderId folder ID
     * @return List of DLFileEntry objects in folder
     */
    List<DLFileEntry> getFileEntries(long folderId);
}

/**
 * Abstract document store providing storage backend interface
 */
public abstract class Store {
    
    /**
     * Stores file content with specified key
     * @param companyId company ID
     * @param repositoryId repository ID
     * @param fileName file name
     * @param versionLabel version label
     * @param inputStream file content stream
     * @throws SystemException if storage fails
     */
    public abstract void addFile(long companyId, long repositoryId, String fileName,
        String versionLabel, InputStream inputStream) throws SystemException;
    
    /**
     * Retrieves file content as input stream
     * @param companyId company ID
     * @param repositoryId repository ID
     * @param fileName file name
     * @param versionLabel version label
     * @return InputStream for file content
     * @throws SystemException if retrieval fails
     */
    public abstract InputStream getFileAsStream(long companyId, long repositoryId,
        String fileName, String versionLabel) throws SystemException;
    
    /**
     * Deletes file from storage
     * @param companyId company ID
     * @param repositoryId repository ID
     * @param fileName file name
     * @param versionLabel version label
     * @throws SystemException if deletion fails
     */
    public abstract void deleteFile(long companyId, long repositoryId, String fileName,
        String versionLabel) throws SystemException;
    
    /**
     * Checks if file exists in storage
     * @param companyId company ID
     * @param repositoryId repository ID
     * @param fileName file name
     * @param versionLabel version label
     * @return true if file exists
     */
    public abstract boolean hasFile(long companyId, long repositoryId, String fileName,
        String versionLabel);
}

/**
 * File system storage implementation
 */
public class FileSystemStore extends Store {
    // File system-based storage implementation
}

/**
 * Database storage implementation using BLOB fields
 */
public class DBStore extends Store {
    // Database BLOB-based storage implementation
}

/**
 * Amazon S3 storage implementation
 */
public class S3Store extends Store {
    // Amazon S3-based storage implementation
}

/**
 * Expando table representing custom field container for entity type
 */
public class ExpandoTable {
    
    /**
     * Gets table ID
     * @return table ID
     */
    public long getTableId();
    
    /**
     * Gets table name
     * @return table name
     */
    public String getName();
    
    /**
     * Gets entity class name this table is for
     * @return entity class name
     */
    public String getClassName();
}

/**
 * Expando column representing individual custom field definition
 */
public class ExpandoColumn {
    
    /**
     * Gets column ID
     * @return column ID
     */
    public long getColumnId();
    
    /**
     * Gets column name
     * @return column name
     */
    public String getName();
    
    /**
     * Gets column data type
     * @return data type constant
     */
    public int getType();
    
    /**
     * Gets default value for column
     * @return default value
     */
    public Serializable getDefaultValue();
    
    /**
     * Sets default value for column
     * @param defaultValue default value
     */
    public void setDefaultValue(Serializable defaultValue);
}

/**
 * Expando value representing actual custom field data for entity instance
 */
public class ExpandoValue {
    
    /**
     * Gets value ID
     * @return value ID
     */
    public long getValueId();
    
    /**
     * Gets entity class primary key this value belongs to
     * @return entity class primary key
     */
    public long getClassPK();
    
    /**
     * Gets column ID this value is for
     * @return column ID
     */
    public long getColumnId();
    
    /**
     * Gets the stored value
     * @return stored value
     */
    public Serializable getValue();
    
    /**
     * Sets the stored value
     * @param value value to store
     */
    public void setValue(Serializable value);
}

/**
 * Expando service for managing custom fields
 */
public interface ExpandoValueService {
    
    /**
     * Adds custom field value for entity
     * @param className entity class name
     * @param tableName table name
     * @param columnName column name
     * @param classPK entity primary key
     * @param value value to store
     * @return created ExpandoValue
     * @throws PortalException if creation fails
     */
    ExpandoValue addValue(String className, String tableName, String columnName,
        long classPK, Serializable value) throws PortalException;
    
    /**
     * Gets custom field value for entity
     * @param className entity class name
     * @param tableName table name
     * @param columnName column name
     * @param classPK entity primary key
     * @return ExpandoValue or null if not found
     */
    ExpandoValue getValue(String className, String tableName, String columnName, long classPK);
    
    /**
     * Updates custom field value
     * @param className entity class name
     * @param tableName table name
     * @param columnName column name
     * @param classPK entity primary key
     * @param value new value
     * @return updated ExpandoValue
     * @throws PortalException if update fails
     */
    ExpandoValue updateValue(String className, String tableName, String columnName,
        long classPK, Serializable value) throws PortalException;
    
    /**
     * Deletes custom field value
     * @param className entity class name
     * @param tableName table name
     * @param columnName column name
     * @param classPK entity primary key
     * @throws PortalException if deletion fails
     */
    void deleteValue(String className, String tableName, String columnName, long classPK)
        throws PortalException;
}

public class CustomPortlet extends BasePortlet {
    
    @Override
    public void render(RenderRequest renderRequest, RenderResponse renderResponse)
            throws PortletException, IOException {
        
        // Get portlet preferences
        PortletPreferences preferences = renderRequest.getPreferences();
        String title = preferences.getValue("title", "Default Title");
        
        // Set render attributes
        renderRequest.setAttribute("title", title);
        renderRequest.setAttribute("data", getPortletData());
        
        // Forward to JSP
        PortletRequestDispatcher dispatcher = getPortletContext()
            .getRequestDispatcher("/html/view.jsp");
        dispatcher.include(renderRequest, renderResponse);
    }
    
    @Override
    public void processAction(ActionRequest actionRequest, ActionResponse actionResponse)
            throws PortletException, IOException {
        
        String action = actionRequest.getParameter("action");
        
        if ("updateSettings".equals(action)) {
            // Update portlet preferences
            PortletPreferences preferences = actionRequest.getPreferences();
            preferences.setValue("title", actionRequest.getParameter("title"));
            preferences.store();
        }
    }
}

// Create asset entry for custom content
ServiceContext serviceContext = new ServiceContext();
serviceContext.setUserId(userId);
serviceContext.setScopeGroupId(groupId);

AssetEntry entry = assetEntryService.addEntry(
    "com.company.model.CustomContent",
    customContent.getId(),
    customContent.getTitle(),
    customContent.getDescription(),
    serviceContext
);

// Add categories and tags
String[] categoryNames = {"Technology", "Tutorial"};
String[] tagNames = {"java", "portlet", "liferay"};
assetEntryService.updateEntry(entry.getEntryId(), categoryNames, tagNames);

// Upload document
byte[] fileBytes = FileUtil.getBytes(uploadedFile);
DLFileEntry fileEntry = dlFileEntryService.addFileEntry(
    folderId,
    uploadedFile.getName(),
    uploadedFile.getContentType(),
    "Uploaded Document",
    "Document uploaded by user",
    "Initial upload",
    fileBytes,
    serviceContext
);

// Download document
InputStream contentStream = fileEntry.getContentStream();
// Stream content to response

// Add custom field to User entity
expandoValueService.addValue(
    User.class.getName(),
    "CUSTOM_FIELDS",
    "department",
    user.getUserId(),
    "Engineering"
);

// Retrieve custom field value
ExpandoValue departmentValue = expandoValueService.getValue(
    User.class.getName(),
    "CUSTOM_FIELDS", 
    "department",
    user.getUserId()
);

String department = (String) departmentValue.getValue();