class CreateFunctionAlias extends SchemaStatement {

    private String aliasName;
    private String javaClassMethod;
    private boolean deterministic;
    private boolean ifNotExists;
    private boolean force;
    private String source;
    private boolean bufferResultSetToLocalTemp = true;

    public CreateFunctionAlias(ServerSession session, Schema schema) {
        super(session, schema);
    }

    @Override
    public int getType() {
        return SQLStatement.CREATE_ALIAS;
    }

    public void setAliasName(String name) {
        this.aliasName = name;
    }

    /**
     * Set the qualified method name after removing whitespace.
     *
     * @param method the qualified method name
     */
    public void setJavaClassMethod(String method) {
        this.javaClassMethod = StringUtils.replaceAll(method, " ", "");
    }

    public void setDeterministic(boolean deterministic) {
        this.deterministic = deterministic;
    }

    public void setIfNotExists(boolean ifNotExists) {
        this.ifNotExists = ifNotExists;
    }

    public void setForce(boolean force) {
        this.force = force;
    }

    public void setSource(String source) {
        this.source = source;
    }

    /**
     * Should the return value ResultSet be buffered in a local temporary file?
     *
     * @param b the new value
     */
    public void setBufferResultSetToLocalTemp(boolean b) {
        this.bufferResultSetToLocalTemp = b;
    }

    @Override
    public int update() {<FILL_FUNCTION_BODY>}
}

        session.getUser().checkAdmin();
        DbObjectLock lock = schema.tryExclusiveLock(DbObjectType.FUNCTION_ALIAS, session);
        if (lock == null)
            return -1;

        if (schema.findFunction(session, aliasName) != null) {
            if (!ifNotExists) {
                throw DbException.get(ErrorCode.FUNCTION_ALIAS_ALREADY_EXISTS_1, aliasName);
            }
        } else {
            int id = getObjectId();
            FunctionAlias functionAlias;
            if (javaClassMethod != null) {
                functionAlias = FunctionAlias.newInstance(schema, id, aliasName, javaClassMethod, force,
                        bufferResultSetToLocalTemp);
            } else {
                functionAlias = FunctionAlias.newInstanceFromSource(schema, id, aliasName, source, force,
                        bufferResultSetToLocalTemp);
            }
            functionAlias.setDeterministic(deterministic);
            schema.add(session, functionAlias, lock);
        }
        return 0;
    
<methods>public void <init>(com.lealone.db.session.ServerSession, com.lealone.db.schema.Schema) <variables>protected final non-sealed com.lealone.db.schema.Schema schema