support graph (#1152)

### What problem does this PR solve?

#918 
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

graph/component/switch.py

@@ -0,0 +1,80 @@
+#
+#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+from abc import ABC
+
+import pandas as pd
+
+from api.db import LLMType
+from api.db.services.knowledgebase_service import KnowledgebaseService
+from api.db.services.llm_service import LLMBundle
+from api.settings import retrievaler
+from graph.component.base import ComponentBase, ComponentParamBase
+
+
+class SwitchParam(ComponentParamBase):
+
+    """
+    Define the Switch component parameters.
+    """
+    def __init__(self):
+        super().__init__()
+        """
+        {
+            "cpn_id": "categorize:0",
+            "not": False,
+            "operator": "gt/gte/lt/lte/eq/in",
+            "value": "",
+            "to": ""
+        }
+        """
+        self.conditions = []
+        self.default = ""
+
+    def check(self):
+        self.check_empty(self.conditions, "Switch conditions")
+        self.check_empty(self.default, "Default path")
+
+    def operators(self, field, op, value):
+        if op == "gt":
+            return float(field) > float(value)
+        if op == "gte":
+            return float(field) >= float(value)
+        if op == "lt":
+            return float(field) < float(value)
+        if op == "lte":
+            return float(field) <= float(value)
+        if op == "eq":
+            return str(field) == str(value)
+        if op == "in":
+            return str(field).find(str(value)) >= 0
+        return False
+
+
+class Switch(ComponentBase, ABC):
+    component_name = "Switch"
+
+    def _run(self, history, **kwargs):
+        for cond in self._param.conditions:
+            input = self._canvas.get_component(cond["cpn_id"])["obj"].output()[1]
+            if self._param.operators(input.iloc[0, 0], cond["operator"], cond["value"]):
+                if not cond["not"]:
+                    return pd.DataFrame([{"content": cond["to"]}])
+
+        return pd.DataFrame([{"content": self._param.default}])
+
+
+
+