dev.langchain4j.model.input

Class PromptTemplate

java.lang.Object

dev.langchain4j.model.input.PromptTemplate

public class PromptTemplate
extends Object

Represents a template of a prompt that can be reused multiple times. A template typically contains one or more variables (placeholders) defined as {{variable_name}} that are replaced with actual values to produce a Prompt. Special variables {{current_date}}, {{current_time}}, and {{current_date_time}} are automatically filled with LocalDate.now(), LocalTime.now(), and LocalDateTime.now() respectively. This class uses the Mustache templating engine under the hood, so all Mustache syntax and features are supported.

Method Summary

Modifier and Type	Method and Description
Prompt	apply(Map<String,Object> variables) Applies multiple values to a template containing multiple variables.
Prompt	apply(Object value) Applies a value to a template containing a single variable.
static PromptTemplate	from(String template)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

apply

public Prompt apply(Object value)

Applies a value to a template containing a single variable. The single variable should have the name {{it}}.

Parameters:

value - The value that will be injected in place of the {{it}} placeholder in the template.

Returns:

A Prompt object where the {{it}} placeholder in the template has been replaced by the provided value.

apply

public Prompt apply(Map<String,Object> variables)

Applies multiple values to a template containing multiple variables.

Parameters:

variables - A map of variable names to values that will be injected in place of the corresponding placeholders in the template.

Returns:

A Prompt object where the placeholders in the template have been replaced by the provided values.

from

public static PromptTemplate from(String template)