last hooks for getting default values set

[lwes-java.git] / src / main / java / org / lwes / db / EventTemplateDB.java

package org.lwes.db;

import org.lwes.BaseType;
import org.lwes.EventAttributeSizeException;
import org.lwes.EventSystemException;
import org.lwes.TypeID;
import org.lwes.util.IPAddress;
import org.lwes.util.Log;

import java.io.File;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Provides type checking for the event system. Also provides a place for
 * globally accessible information.
 *
 * @author Anthony Molinaro
 * @author Michael P. Lum
 */
public class EventTemplateDB {
    /**
     * the meta event info inherent to every event
     */
    private static final String META_EVENT_INFO = "MetaEventInfo";

    /**
     * esfFile for this event system.
     */
    private File esfFile = null;
    private InputStream esfInputStream = null;

    /**
     * System Attributes
     */
    private Map<String, Map<String, BaseType>> events = null;
    private Map<String, BaseType> knownTypes = null;
    private Map<String, BaseType> reservedWords = null;

    /**
     * This is the EventTemplateDB constructor.
     */
    public EventTemplateDB() {
        events = new ConcurrentHashMap<String, Map<String, BaseType>>();
        knownTypes = new ConcurrentHashMap<String, BaseType>();
        reservedWords = new ConcurrentHashMap<String, BaseType>();
        initializeKnownTypes();
    }

    /**
     * Sets the Event Specification file for this system
     *
     * @param anEsfFile the ESF file for this system.
     */
    public void setESFFile(File anEsfFile) {
        esfFile = anEsfFile;
    }

    /**
     * Gets the ESF file, in case you want to look at it
     *
     * @return the ESF file used in this system.
     */
    public File getESFFile() {
        return esfFile;
    }

    /**
     * Sets the Event Specification file as an InputStream
     *
     * @param esfInputStream the InputStream representing an ESF file
     */
    public void setESFInputStream(InputStream esfInputStream) {
        this.esfInputStream = esfInputStream;
    }

    /**
     * Ges the ESF InputStream
     *
     * @return the ESF InputStream used in the system
     */
    public InputStream getESFInputStream() {
        return esfInputStream;
    }

    /**
     * Initializes the EventTemplateDB, assumes that setESFFile() has been
     * called.
     *
     * @return true if the EventTemplateDB initializes correctly; false if it
     *         does not. false means the event system is unable to perform validation
     */
    public synchronized boolean initialize() {
        /*
           * Call the parser to parse the file. Any errors cause the
           * initialization to fail.
           */
        ESFParser parser;
        try {
            if (getESFInputStream() != null) {
                parser = new ESFParser(getESFInputStream());
            }
            else if (getESFFile() != null) {
                parser = new ESFParser(
                        new java.io.FileInputStream(getESFFile()));
            }
            else {
                return false;
            }

            parser.setEventTemplateDB(this);
            parser.eventlist();
        }
        catch (java.io.FileNotFoundException e) {
            Log.warning("File not found ", e);

            /*
                * treat this as just a warning and allow things to continue, this
                * allows an empty EventTemplateDB to work when type checking is
                * turned off
                */
        }
        catch (ParseException e) {
            Log.warning("Parser error in ESF file " + getESFFile(), e);
            return false;
        }
        catch (Exception e) {
            Log.error("Error parsing ESF file " + getESFFile(), e);
            /* catch IO, NPEs and other exceptions but still continue */
            return false;
        }

        return true;
    }

    /**
     * Add an Event to the EventTemplateDB
     *
     * @param anEventName the name of the Event to add
     * @return true if the event was added, false if it was not
     */
    public synchronized boolean addEvent(String anEventName) {
        if (anEventName == null) {
            return false;
        }

        try {
            if (anEventName.equals(META_EVENT_INFO)) {
                return true;
            }

            if (events.containsKey(anEventName)) {
                Log.info("Event " + anEventName + " already exists in event DB");
                return false;
            }

            Map<String, BaseType> evtHash = new ConcurrentHashMap<String, BaseType>();
            if (!(reservedWords.isEmpty())) {
                /* insert reserved words into new event */
                for (String key : reservedWords.keySet()) {
                    if (key != null) {
                        evtHash.put(key, reservedWords.get(key));
                    }
                }
            }

            events.put(anEventName, evtHash);
        }
        catch (Exception e) {
            Log.warning("Error adding event to EventTemplateDB", e);
        }

        return true;
    }

    public synchronized boolean addEventAttribute(String anEventName,
                                                  String anAttributeName,
                                                  String anAttributeType) {
        return addEventAttribute(anEventName,
                                 anAttributeName,
                                 anAttributeType,
                                 -1,
                                 false);
    }

    public synchronized boolean addEventAttribute(String anEventName,
                                                  String anAttributeName,
                                                  String anAttributeType,
                                                  Integer size,
                                                  boolean required) {
        return addEventAttribute(anEventName, anAttributeName, anAttributeType, size, required, null);
    }

    /**
     * Add an attribute to an Event in the EventTemplateDB
     *
     * @param anEventName     the name of the event to add this attribute to
     * @param anAttributeName the name of the attribute to add
     * @param anAttributeType the type of the attribute, should be the name of the type
     *                        given in the ESF Specification.
     * @param size            The size restriction for this attribute
     * @param required        Is this attribute required
     * @return true if the attribute can be added, false if it can not.
     */
    public synchronized boolean addEventAttribute(String anEventName,
                                                  String anAttributeName,
                                                  String anAttributeType,
                                                  Integer size,
                                                  boolean required,
                                                  Object defaultValue) {

        if (anEventName == null || anAttributeName == null || anAttributeType == null) {
            return false;
        }

        try {
            if (anEventName.equals(META_EVENT_INFO)) {
                if (checkForType(anAttributeType)) {
                    reservedWords.put(anAttributeName, knownTypes.get(anAttributeType));
                    return true;
                }
                else {
                    Log.info("Meta keyword " + anEventName + "." + anAttributeName +
                             "has unknown type " + anAttributeType + ", skipping");
                    return false;
                }
            }

            if (reservedWords.containsKey(anEventName)) {
                Log.warning("Unable to add attribute named " + anAttributeName +
                            "as it is a reserved word, skipping");
                return false;
            }

            if (events.containsKey(anEventName)) {
                Map<String, BaseType> evtHash = events.get(anEventName);
                if (checkForType(anAttributeType)) {
                    BaseType bt = knownTypes.get(anAttributeType).cloneBaseType();
                    bt.setRequired(required);
                    bt.setSizeRestriction(size);
                    if (defaultValue != null) {
                        bt.setDefaultValue(defaultValue);
                    }
                    evtHash.put(anAttributeName, bt);
                    return true;
                }
                else {
                    Log.warning("Type " + anAttributeType + " does not exist for " +
                                anAttributeName + ", skipping");
                    return false;
                }
            }
            else {
                Log.warning("No such event " + anEventName + ", skipping");
                return false;
            }
        }
        catch (Exception e) {
            Log.error("Error adding attribute " + anAttributeName + " to " + anEventName, e);
            return false;
        }
    }

    /**
     * Returns an enumeration of all defined events
     *
     * @return an enumeration of all defined events
     */
    public Enumeration<String> getEventNames() {
        return Collections.enumeration(this.events.keySet());
    }

    /**
     * Returns true if the type given by aTypeName is a valid type in the DB.
     *
     * @param aTypeName a type name according to the ESF Specification
     * @return true if the type exists in the DB, false otherwise
     */
    public boolean checkForType(String aTypeName) {
        if (aTypeName == null) {
            return false;
        }
        return knownTypes.containsKey(aTypeName);
    }

    public void checkForSize(String eventName,
                             String attributeName,
                             BaseType attributeValue) throws EventAttributeSizeException {

        if (!attributeValue.getTypeName().startsWith("[L")) {
            if (Log.isLogDebug()) {
                Log.debug("value for attribute " + attributeName + " is not an array.");
            }
            return;
        }

        Map<String, BaseType> evtMap = events.get(eventName);
        if (evtMap == null) {
            Log.error("event definition did not exist");
            return;
        }
        BaseType attrBaseType = evtMap.get(attributeName);
        if (attrBaseType == null) {
            Log.error("attribute definition did not exist");
            return;
        }

        int sizeToCheck = 0;
        int size = attrBaseType.getSizeRestriction();
        Object o = attributeValue.getTypeObject();
        if (o instanceof short[]) {
            sizeToCheck = ((short[])o).length;
        }
        else if (o instanceof int[]) {
            sizeToCheck = ((int[])o).length;
        }
        else if (o instanceof long[]) {
            sizeToCheck = ((long[])o).length;
        }
        else if (o instanceof boolean[]) {
            sizeToCheck = ((boolean[])o).length;
        }
        else if (o instanceof byte[]) {
            sizeToCheck = ((byte[])o).length;
        }
        else {
            Object[] arr = (Object[]) attributeValue.getTypeObject();
            sizeToCheck = arr.length;
        }
        if (Log.isLogTrace()) {
            Log.trace("sizeToCheck: " + sizeToCheck + " size: " + size);
        }
        if (size > 0 && sizeToCheck > size) {
            throw new EventAttributeSizeException(attributeName, sizeToCheck, size);
        }
    }

    /**
     * Checks to see if an Event exists in the EventTemplateDB
     *
     * @param anEventName the name of the event to check the existence of
     * @return true if the event with the name <tt>anEventName</tt> exists in
     *         the EventTemplateDB, false otherwise.
     */
    public boolean checkForEvent(String anEventName) {
        if (anEventName == null) {
            return false;
        }
        return events.containsKey(anEventName);
    }

    /**
     * Checks to see if an attribute <tt>anAttributeName</tt> exists for the
     * event <tt>anEventName</tt>
     *
     * @param anEventName     the name of an Event
     * @param anAttributeName the name of an attribute of Event to check
     * @return true if the attribute exists as a member of event, false
     *         otherwise
     */
    public boolean checkForAttribute(String anEventName, String anAttributeName) {
        if (anEventName == null || anAttributeName == null) {
            return false;
        }

        if (checkForEvent(anEventName)) {
            Map<String, BaseType> evtHash = events.get(anEventName);
            return evtHash.containsKey(anAttributeName);
        }
        return false;
    }

    /**
     * Checks to see if the type of an attribute is proper. (i.e. if the given
     * attribute of the given event has the same type assigned to it as the type
     * of the given objects value)
     *
     * @param anEventName      the name of an Event.
     * @param anAttributeName  the name of the attribute whose type is being checked
     * @param anAttributeValue the Object containing the possible value of the attribute.
     * @return true if the event and attribute exist and if the type of the
     *         attribute matches the type assigned to this attribute in the
     *         EventTemplateDB, false otherwise.
     */
    public boolean checkTypeForAttribute(String anEventName,
                                         String anAttributeName,
                                         Object anAttributeValue) {
        if (anEventName == null || anAttributeName == null || anAttributeValue == null) {
            return false;
        }

        if (checkForAttribute(anEventName, anAttributeName)) {
            Map<String, BaseType> evtHash = events.get(anEventName);
            Object storedTypeObject = evtHash.get(anAttributeName);
            byte type1 = ((BaseType) anAttributeValue).getTypeToken();
            byte type2 = ((BaseType) storedTypeObject).getTypeToken();
            if (type1 == type2) {
                return true;
            }
        }

        return false;
    }

    /**
     * Checks to see if the type of an attribute is proper. (i.e. if the given
     * attribute of the given event has the same type assigned to it as the type
     * given)
     *
     * @param anEventName     the name of an Event.
     * @param anAttributeName the name of the attribute whose type is being checked
     * @param anAttributeType the String containing the possible type value of the
     *                        attribute.
     * @return true if the event and attribute exist and if the type of the
     *         attribute matches the type assigned to this attribute in the
     *         EventTemplateDB, false otherwise.
     */
    public boolean checkTypeForAttribute(String anEventName,
                                         String anAttributeName, String anAttributeType) {
        if (anEventName == null || anAttributeName == null || anAttributeType == null) {
            return false;
        }

        if (checkForAttribute(anEventName, anAttributeName)) {
            Map<String, BaseType> evtHash = events.get(anEventName);
            String storedTypeName = evtHash.get(anAttributeName).getTypeName();
            System.out
                    .println("attr: " +
                             anAttributeName +
                             " stored: " +
                             storedTypeName +
                             " passed in: " +
                             anAttributeType);
            if (anAttributeType.equals(storedTypeName)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Given an Object which is the attribute value of the attribute
     * <tt>attributeName</tt> of event <tt>eventName</tt>, return the internal
     * representation (i.e. <tt>BaseType</tt>) of this Object
     *
     * @param eventName      the name of an Event.
     * @param attributeName  the name of an attribute of <tt>eventName</tt>
     * @param attributeValue the value of the attribute
     * @return the <tt>BaseType</tt> representation of <tt>attributeValue</tt>
     */
    public BaseType getBaseTypeForObjectAttribute(String eventName,
                                                  String attributeName,
                                                  Object attributeValue) {
        if (eventName == null || attributeName == null || attributeValue == null) {
            return null;
        }

        Map<String, BaseType> evtHash = events.get(eventName);
        BaseType tmpBaseType = evtHash.get(attributeName);
        BaseType retBaseType = tmpBaseType.cloneBaseType();
        retBaseType.setTypeObject(attributeValue);
        return retBaseType;
    }

    /**
     * Returns the base types for this event
     *
     * @param eventName
     * @return a map of event fields to base types
     */
    public Map<String, BaseType> getBaseTypesForEvent(String eventName) {
        if (eventName == null) {
            return null;
        }

        Map<String, BaseType> map = events.get(eventName);

        return map == null ? new ConcurrentHashMap<String, BaseType>() : map;
    }

    /**
     * Parses the string representation of an event attribute into the
     * appropriate objectt.
     *
     * @param anEventName          the name of an Event.
     * @param anAttributeName      the name of the attribute we are parsing
     * @param stringAttributeValue a string representation of the value of the attribute given by
     *                             anAttributeName.
     * @return the object represented by the string
     *         <tt>stringAttributeValue</tt>
     */
    public Object parseAttribute(String anEventName, String anAttributeName,
                                 String stringAttributeValue) {
        Object retObject = null;

        if (anEventName == null || anAttributeName == null || stringAttributeValue == null) {
            return null;
        }

        Log.trace("parseAttribute: " + anEventName + "." + anAttributeName + "=" +
                  stringAttributeValue);

        if (checkForAttribute(anEventName, anAttributeName)) {
            Log.trace("parseAttribute: passed first if attribute exists");

            Map<String, BaseType> evtHash = events.get(anEventName);
            try {
                BaseType bt = evtHash.get(anAttributeName);
                if (bt == null) {
                    throw new EventSystemException("Null BaseType for "
                                                   + anAttributeName);
                }

                retObject = bt.parseFromString(stringAttributeValue);
                Log.trace("parseAttribute: parsed " + retObject);
            }
            catch (EventSystemException btpe) {
                Log.error("Unable to parseAttribute", btpe);
            }
        }

        Log.trace("parseAttribute: returning " + retObject);
        return retObject;
    }

    /**
     * Returns a HTML rendering of the EventTemplateDB
     *
     * @return HTML string of the EventTemplateDB
     */
    public String toHtmlString() {
        StringBuffer sb = new StringBuffer();
        sb.append("<table>\n");
        sb.append("<tr><th>" + META_EVENT_INFO
                  + "</th><th>Type</th><th>Name</th></tr>\n");
        for (String key : reservedWords.keySet()) {
            BaseType tv = reservedWords.get(key);
            String type = tv.getTypeName();
            sb.append("<tr><td></td><td>").append(type).append("</td><td>").append(key).append("</td></tr>\n");
        }
        for (String EventKey : events.keySet()) {
            sb.append("<tr><th>").append(EventKey).append("</th><th>Type</th><th>Name</th></tr>\n");
            if (EventKey != null) {
                Map<String, BaseType> event = events.get(EventKey);
                for (Enumeration<String> att = Collections.enumeration(event.keySet()); att
                        .hasMoreElements();) {
                    String key = att.nextElement();
                    BaseType tv = event.get(key);
                    String type = tv.getTypeName();
                    sb.append("<tr><td></td><td>")
                            .append(type)
                            .append("</td><td>")
                            .append(key).append("</td></tr>\n");
                }
            }
        }

        sb.append("</table>\n");
        return sb.toString();

    }

    /**
     * Returns a rather long string Representation of the EventTemplateDB
     *
     * @return a string Representation of the EventTemplateDB
     */
    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("\n" + META_EVENT_INFO + "\n{\n");
        String[] reservedKeys = new String[reservedWords.size()];
        int i = 0, j = 0;

        for (String s1 : reservedWords.keySet()) {
            reservedKeys[i] = s1;
            ++i;
        }
        Arrays.sort(reservedKeys);

        for (i = 0; i < reservedKeys.length; ++i) {
            BaseType tv = reservedWords.get(reservedKeys[i]);
            String type = tv.getTypeName();
            sb.append("\t").append(type).append(" ").append(reservedKeys[i]).append(";\n");
        }
        sb.append("}\n");

        String[] eventKeys = new String[events.size()];
        i = 0;
        for (String s : events.keySet()) {
            eventKeys[i] = s;
            ++i;
        }
        Arrays.sort(eventKeys);

        for (i = 0; i < eventKeys.length; ++i) {
            sb.append(eventKeys[i]).append("\n{\n");
            if (eventKeys[i] != null) {
                Map<String, BaseType> event = events.get(eventKeys[i]);
                j = 0;
                String[] attributeKeys = new String[event.size()];
                for (Enumeration<String> att = Collections.enumeration(event.keySet());
                     att.hasMoreElements();) {
                    attributeKeys[j] = att.nextElement();
                    ++j;
                }
                Arrays.sort(attributeKeys);

                for (j = 0; j < attributeKeys.length; ++j) {
                    BaseType tv = event.get(attributeKeys[j]);
                    String type = tv.getTypeName();
                    sb.append("\t").append(type).append(" ").append(attributeKeys[j]).append(";\n");
                }
            }
            sb.append("}\n");
        }
        return sb.toString();
    }

    /**
     * Creates a map of known types
     */
    private void initializeKnownTypes() {
        /* initialize the list of known types */
        knownTypes.put(TypeID.UINT16_STRING, new BaseType(TypeID.UINT16_STRING,
                                                          TypeID.UINT16_TOKEN, 0));
        knownTypes.put(TypeID.INT16_STRING, new BaseType(TypeID.INT16_STRING,
                                                         TypeID.INT16_TOKEN, (short) 0));
        knownTypes.put(TypeID.UINT32_STRING, new BaseType(TypeID.UINT32_STRING,
                                                          TypeID.UINT32_TOKEN, (long) 0));
        knownTypes.put(TypeID.INT32_STRING, new BaseType(TypeID.INT32_STRING,
                                                         TypeID.INT32_TOKEN, 0));
        knownTypes.put(TypeID.STRING_STRING, new BaseType(TypeID.STRING_STRING,
                                                          TypeID.STRING_TOKEN, ""));
        knownTypes.put(TypeID.IPADDR_STRING, new BaseType(TypeID.IPADDR_STRING,
                                                          TypeID.IPADDR_TOKEN, new IPAddress()));
        knownTypes.put(TypeID.INT64_STRING, new BaseType(TypeID.INT64_STRING,
                                                         TypeID.INT64_TOKEN, (long) 0));
        knownTypes.put(TypeID.UINT64_STRING, new BaseType(TypeID.UINT64_STRING,
                                                          TypeID.UINT64_TOKEN, BigInteger.ZERO));
        knownTypes.put(TypeID.BOOLEAN_STRING, new BaseType(TypeID.BOOLEAN_STRING,
                                                           TypeID.BOOLEAN_TOKEN, true));
        knownTypes.put(TypeID.STRING_ARRAY_STRING,
                       new BaseType(TypeID.STRING_ARRAY_STRING,
                                    TypeID.STRING_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.INT16_ARRAY_STRING,
                       new BaseType(TypeID.INT16_ARRAY_STRING,
                                    TypeID.INT16_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.INT32_ARRAY_STRING,
                       new BaseType(TypeID.INT32_ARRAY_STRING,
                                    TypeID.INT32_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.INT64_ARRAY_STRING,
                       new BaseType(TypeID.INT64_ARRAY_STRING,
                                    TypeID.INT64_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.UINT16_ARRAY_STRING,
                       new BaseType(TypeID.UINT16_ARRAY_STRING,
                                    TypeID.UINT16_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.UINT32_ARRAY_STRING,
                       new BaseType(TypeID.UINT32_ARRAY_STRING,
                                    TypeID.UINT32_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.UINT64_ARRAY_STRING,
                       new BaseType(TypeID.UINT64_ARRAY_STRING,
                                    TypeID.UINT64_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.BOOLEAN_ARRAY_STRING,
                       new BaseType(TypeID.BOOLEAN_ARRAY_STRING,
                                    TypeID.BOOLEAN_ARRAY_TOKEN, null));
        knownTypes.put(TypeID.BYTE_ARRAY_STRING,
                       new BaseType(TypeID.BYTE_ARRAY_STRING,
                                    TypeID.BYTE_ARRAY_TOKEN, null));
    }

    public Map<String, BaseType> getMetaFields() {
        Map<String, BaseType> m = new TreeMap<String, BaseType>();
        m.putAll(reservedWords);
        return m;
    }

    public Map<String, Map<String, BaseType>> getEvents() {
        Map<String, Map<String, BaseType>> cp = new TreeMap<String, Map<String, BaseType>>();
        cp.putAll(events);
        return cp;
    }
}