private static void checkTableExists()

in infra/binder/src/main/java/org/apache/shardingsphere/infra/binder/engine/segment/dml/from/type/SimpleTableSegmentBinder.java [133:178]
45 lines of code
26 McCabe index (conditional complexity)

    private static void checkTableExists(final SQLStatementBinderContext binderContext, final ShardingSphereSchema schema, final String schemaName, final String tableName) {
        // TODO refactor table exists check with spi @duanzhengqiang
        if (binderContext.getSqlStatement() instanceof CreateTableStatement && isCreateTable(((CreateTableStatement) binderContext.getSqlStatement()).getTable(), tableName)) {
            ShardingSpherePreconditions.checkState(binderContext.getHintValueContext().isSkipMetadataValidate()
                    || ((CreateTableStatement) binderContext.getSqlStatement()).isIfNotExists() || !schema.containsTable(tableName), () -> new TableExistsException(tableName));
            return;
        }
        if (binderContext.getSqlStatement() instanceof AlterTableStatement && isRenameTable((AlterTableStatement) binderContext.getSqlStatement(), tableName)) {
            ShardingSpherePreconditions.checkState(binderContext.getHintValueContext().isSkipMetadataValidate() || !schema.containsTable(tableName), () -> new TableExistsException(tableName));
            return;
        }
        if (binderContext.getSqlStatement() instanceof DropTableStatement) {
            ShardingSpherePreconditions.checkState(((DropTableStatement) binderContext.getSqlStatement()).isIfExists() || schema.containsTable(tableName), () -> new TableNotFoundException(tableName));
            return;
        }
        if (binderContext.getSqlStatement() instanceof RenameTableStatement && isRenameTable((RenameTableStatement) binderContext.getSqlStatement(), tableName)) {
            ShardingSpherePreconditions.checkState(binderContext.getHintValueContext().isSkipMetadataValidate() || !schema.containsTable(tableName), () -> new TableExistsException(tableName));
            return;
        }
        if (binderContext.getSqlStatement() instanceof CreateViewStatement && isCreateTable(((CreateViewStatement) binderContext.getSqlStatement()).getView(), tableName)) {
            ShardingSpherePreconditions.checkState(binderContext.getHintValueContext().isSkipMetadataValidate()
                    || ((CreateViewStatement) binderContext.getSqlStatement()).isReplaceView() || !schema.containsTable(tableName), () -> new TableExistsException(tableName));
            return;
        }
        if (binderContext.getSqlStatement() instanceof AlterViewStatement && isRenameView((AlterViewStatement) binderContext.getSqlStatement(), tableName)) {
            ShardingSpherePreconditions.checkState(binderContext.getHintValueContext().isSkipMetadataValidate() || !schema.containsTable(tableName), () -> new TableExistsException(tableName));
            return;
        }
        if (binderContext.getSqlStatement() instanceof DropViewStatement) {
            ShardingSpherePreconditions.checkState(((DropViewStatement) binderContext.getSqlStatement()).isIfExists() || schema.containsTable(tableName), () -> new TableNotFoundException(tableName));
            return;
        }
        if ("DUAL".equalsIgnoreCase(tableName)) {
            return;
        }
        if (SystemSchemaManager.isSystemTable(schemaName, tableName)) {
            return;
        }
        if (binderContext.getExternalTableBinderContexts().containsKey(new CaseInsensitiveString(tableName))) {
            return;
        }
        if (binderContext.getCommonTableExpressionsSegmentsUniqueAliases().contains(tableName)) {
            return;
        }
        ShardingSpherePreconditions.checkState(schema.containsTable(tableName), () -> new TableNotFoundException(tableName));
    }