Make operators as a strategy pattern

1 files changed, 45 insertions, 0 deletions

diff --git a/src/content/operators/impls/find.ts b/src/content/operators/impls/find.ts
new file mode 100644
index 0000000..82310bc
--- /dev/null
+++ b/src/content/operators/impls/find.ts
@@ -0,0 +1,45 @@
+import { inject, injectable } from "tsyringe";
+import RepeatOperator from "./RepeatOperator";
+import Operator from "../Operator";
+import OperatorFactoryChain from "../OperatorFactoryChain";
+import FindMasterClient from "../../client/FindMasterClient";
+import * as operations from "../../../shared/operations";
+
+export class FindNextOperator implements Operator {
+  constructor(private readonly findMasterClient: FindMasterClient) {}
+
+  async run(): Promise<void> {
+    this.findMasterClient.findNext();
+  }
+}
+
+export class FindPrevOperator implements Operator {
+  constructor(private readonly findMasterClient: FindMasterClient) {}
+
+  async run(): Promise<void> {
+    this.findMasterClient.findPrev();
+  }
+}
+
+@injectable()
+export class FindOperatorFactoryChain implements OperatorFactoryChain {
+  constructor(
+    @inject("FindMasterClient")
+    private readonly findMasterClient: FindMasterClient
+  ) {}
+  create(op: operations.Operation, repeat: number): Operator | null {
+    switch (op.type) {
+      case operations.FIND_NEXT:
+        return new RepeatOperator(
+          new FindNextOperator(this.findMasterClient),
+          repeat
+        );
+      case operations.FIND_PREV:
+        return new RepeatOperator(
+          new FindPrevOperator(this.findMasterClient),
+          repeat
+        );
+    }
+    return null;
+  }
+}