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#
# SPDX-License-Identifier: Apache-2.0
from typing import List
from haystack import component, logging
from haystack.core.component.types import Variadic
logger = logging.getLogger(__name__)
@component
class StringJoiner:
"""
Component to join strings from different components to a list of strings.
### Usage example
```python
from haystack.components.joiners import StringJoiner
from haystack.components.builders import PromptBuilder
from haystack.core.pipeline import Pipeline
from haystack.components.generators.chat import OpenAIChatGenerator
from haystack.dataclasses import ChatMessage
string_1 = "What's Natural Language Processing?"
string_2 = "What is life?"
pipeline = Pipeline()
pipeline.add_component("prompt_builder_1", PromptBuilder("Builder 1: {{query}}"))
pipeline.add_component("prompt_builder_2", PromptBuilder("Builder 2: {{query}}"))
pipeline.add_component("string_joiner", StringJoiner())
pipeline.connect("prompt_builder_1.prompt", "string_joiner.strings")
pipeline.connect("prompt_builder_2.prompt", "string_joiner.strings")
print(pipeline.run(data={"prompt_builder_1": {"query": string_1}, "prompt_builder_2": {"query": string_2}}))
>> {"string_joiner": {"strings": ["Builder 1: What's Natural Language Processing?", "Builder 2: What is life?"]}}
```
"""
@component.output_types(strings=List[str])
def run(self, strings: Variadic[str]):
"""
Joins strings into a list of strings
:param strings:
strings from different components
:returns:
A dictionary with the following keys:
- `strings`: Merged list of strings
"""
out_strings = list(strings)
return {"strings": out_strings}
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