Class PromptTemplate

java.lang.Object
com.codename1.ai.PromptTemplate
public final class PromptTemplate extends Object

Trivial {placeholder} substitution. Designed for the common "build a prompt from a handful of fields" pattern without pulling in a templating library. For anything more sophisticated (loops, conditionals) just compose strings directly.

String prompt = PromptTemplate.of(
    "You are an expert {role}. Reply in {style}."
).put("role", "tax accountant").put("style", "bullet points").build();

  • Method Details

    • of

      public static PromptTemplate of(String template)
      Starts a template instance.
      Parameters:
      template - text containing optional {name} placeholders
      Returns:
      mutable template values bound to the supplied text

    • put

      public PromptTemplate put(String key, String value)
      Binds one placeholder. A null value renders as an empty string.
      Parameters:
      key - placeholder name without braces
      value - replacement value
      Returns:
      this template

    • putAll

      public PromptTemplate putAll(Map<String,String> map)
      Adds all supplied placeholder values.
      Parameters:
      map - replacements keyed by placeholder name; null is ignored
      Returns:
      this template

    • build

      public String build()
      Renders the final string. Unknown placeholders are left intact ({like_this}) so they're easy to spot in test output -- silently dropping them tends to hide bugs.
      Returns:
      rendered prompt text

    • asUser

      public ChatMessage asUser()
      Convenience: render and wrap as a ChatMessage with USER role.
      Returns:
      rendered user message

    • asSystem

      public ChatMessage asSystem()
      Convenience: render and wrap as a ChatMessage with SYSTEM role.
      Returns:
      rendered system message