Package io.higson.runtime.core

Class AdhocContext

java.lang.Object
io.higson.runtime.engine.core.context.DefaultContext
io.higson.runtime.core.HigsonContext
io.higson.runtime.core.AdhocContext
All Implemented Interfaces:
ParamContext
public class AdhocContext extends HigsonContext
This class helps to override default behaviour of parent context with custom values. There are few possibilities of creating proper AdhocContext instance:
1. Invoking empty constructor, will simply return instance of AdhocContext for later usage.
2. Invoking constructor with first parameter as parent context. Must be type of DefaultContext. Pairs of key/value (path/object) are optional.
3. Invoking constructor with simple pair of parameters. Key/value, where key is path to element, value is any Object.
If there was mismatch with providing key/value pairs, then HigsonRuntimeException is thrown.
Best usage of AdhocContext - parentContext + pairs that will override parent: 

  HigsonContext base = new HigsonContext() // parent context
 	.set("a", 1)
 	.set("b", 2)
 	.set("c", 3);

  AdhocContext ctx = new AdhocContext(base, "b", 222, "d", 444);
  assertThat(ctx.get("a"), is(1));
  assertThat(ctx.get("b"), is(222));
  assertThat(ctx.get("c"), is(3));
  assertThat(ctx.get("d"), is(444));
Empty constructor: 

  AdhocContext ctx = new AdhocContext(); // empty context
Create adhoc context without parent: 

  AdhocContext ctx = new AdhocContext("b", 222, "d", 444);

  assertThat(ctx.get("a"), nullValue());
  assertThat(ctx.get("b"), is(222));
  assertThat(ctx.get("c"), nullValue());
  assertThat(ctx.get("d"), is(444));
Author:
przemek hertel

  • Constructor Details

    • AdhocContext

      public AdhocContext(Object... args)
      This constructor by design doesn't call super (parent constructor).
      Parameters:
      args - possible scenarios of arguments: parentContext + pairs of path/value, only pairs of path/value, no parameters.

  • Method Details

    • get

      public Object get(String path)
      get value from adhoc context or from parent (if not found in adhoc)
      Overrides:
      get in class HigsonContext
      Parameters:
      path - to be resolved when looking for object
      Returns:
      object if path was successfully resolved, otherwise null