diff --git a/modules/angular2/src/change_detection/change_detection_jit_generator.ts b/modules/angular2/src/change_detection/change_detection_jit_generator.ts
index 0baa8e0467..6eb3914684 100644
--- a/modules/angular2/src/change_detection/change_detection_jit_generator.ts
+++ b/modules/angular2/src/change_detection/change_detection_jit_generator.ts
@@ -7,6 +7,7 @@ import {DirectiveIndex, DirectiveRecord} from './directive_record';
 
 import {ProtoRecord, RecordType} from './proto_record';
 import {CodegenNameUtil, sanitizeName} from './codegen_name_util';
+import {CodegenLogicUtil} from './codegen_logic_util';
 
 
 /**
@@ -24,6 +25,7 @@ var IS_CHANGED_LOCAL = "isChanged";
 var CHANGES_LOCAL = "changes";
 
 export class ChangeDetectorJITGenerator {
+  _logic: CodegenLogicUtil;
   _names: CodegenNameUtil;
   _typeName: string;
 
@@ -31,6 +33,7 @@ export class ChangeDetectorJITGenerator {
               public records: List<ProtoRecord>, public directiveRecords: List<any>,
               private generateCheckNoChanges: boolean) {
     this._names = new CodegenNameUtil(this.records, this.directiveRecords, UTIL);
+    this._logic = new CodegenLogicUtil(this._names, UTIL);
     this._typeName = sanitizeName(`ChangeDetector_${this.id}`);
   }
 
@@ -206,7 +209,7 @@ export class ChangeDetectorJITGenerator {
     var oldValue = this._names.getFieldName(r.selfIndex);
     var newValue = this._names.getLocalName(r.selfIndex);
     var read = `
-      ${this._genUpdateCurrentValue(r)}
+      ${this._logic.genUpdateCurrentValue(r)}
     `;
 
     var check = `
@@ -232,80 +235,6 @@ export class ChangeDetectorJITGenerator {
     }
   }
 
-  _genUpdateCurrentValue(r: ProtoRecord): string {
-    var context = (r.contextIndex == -1) ? this._names.getDirectiveName(r.directiveIndex) :
-                                           this._names.getLocalName(r.contextIndex);
-    var newValue = this._names.getLocalName(r.selfIndex);
-    var argString = r.args.map((arg) => this._names.getLocalName(arg)).join(", ");
-
-    var rhs;
-    switch (r.mode) {
-      case RecordType.SELF:
-        rhs = context;
-        break;
-
-      case RecordType.CONST:
-        rhs = JSON.stringify(r.funcOrValue);
-        break;
-
-      case RecordType.PROPERTY:
-        rhs = `${context}.${r.name}`;
-        break;
-
-      case RecordType.SAFE_PROPERTY:
-        rhs = `${UTIL}.isValueBlank(${context}) ? null : ${context}.${r.name}`;
-        break;
-
-      case RecordType.LOCAL:
-        rhs = `${this._names.getLocalsAccessorName()}.get('${r.name}')`;
-        break;
-
-      case RecordType.INVOKE_METHOD:
-        rhs = `${context}.${r.name}(${argString})`;
-        break;
-
-      case RecordType.SAFE_INVOKE_METHOD:
-        rhs = `${UTIL}.isValueBlank(${context}) ? null : ${context}.${r.name}(${argString})`;
-        break;
-
-      case RecordType.INVOKE_CLOSURE:
-        rhs = `${context}(${argString})`;
-        break;
-
-      case RecordType.PRIMITIVE_OP:
-        rhs = `${UTIL}.${r.name}(${argString})`;
-        break;
-
-      case RecordType.COLLECTION_LITERAL:
-        rhs = `${UTIL}.${r.name}(${argString})`;
-        break;
-
-      case RecordType.INTERPOLATE:
-        rhs = this._genInterpolation(r);
-        break;
-
-      case RecordType.KEYED_ACCESS:
-        rhs = `${context}[${this._names.getLocalName(r.args[0])}]`;
-        break;
-
-      default:
-        throw new BaseException(`Unknown operation ${r.mode}`);
-    }
-    return `${newValue} = ${rhs}`;
-  }
-
-  _genInterpolation(r: ProtoRecord): string {
-    var res = "";
-    for (var i = 0; i < r.args.length; ++i) {
-      res += JSON.stringify(r.fixedArgs[i]);
-      res += " + ";
-      res += `${UTIL}.s(${this._names.getLocalName(r.args[i])})`;
-      res += " + ";
-    }
-    res += JSON.stringify(r.fixedArgs[r.args.length]);
-    return res;
-  }
-
   _genChangeMarker(r: ProtoRecord): string {
     return r.argumentToPureFunction ? `${this._names.getChangeName(r.selfIndex)} = true` : ``;
   }
diff --git a/modules/angular2/src/change_detection/codegen_facade.dart b/modules/angular2/src/change_detection/codegen_facade.dart
new file mode 100644
index 0000000000..0c3e9275b9
--- /dev/null
+++ b/modules/angular2/src/change_detection/codegen_facade.dart
@@ -0,0 +1,15 @@
+library angular2.src.change_detection.codegen_facade;
+
+import 'dart:convert' show JSON;
+
+/// Converts `funcOrValue` to a string which can be used in generated code.
+String codify(funcOrValue) => JSON.encode(funcOrValue).replaceAll(r'$', r'\$');
+
+/// Combine the strings of generated code into a single interpolated string.
+/// Each element of `vals` is expected to be a string literal or a codegen'd
+/// call to a method returning a string.
+/// The return format interpolates each value as an expression which reads
+/// poorly, but the resulting code is easily flattened by dart2js.
+String combineGeneratedStrings(List<String> vals) {
+  return '"${vals.map((v) => '\${$v}').join('')}"';
+}
diff --git a/modules/angular2/src/change_detection/codegen_facade.ts b/modules/angular2/src/change_detection/codegen_facade.ts
new file mode 100644
index 0000000000..8064f7616e
--- /dev/null
+++ b/modules/angular2/src/change_detection/codegen_facade.ts
@@ -0,0 +1,17 @@
+import {List} from 'angular2/src/facade/collection';
+
+/**
+ * Converts `funcOrValue` to a string which can be used in generated code.
+ */
+export function codify(obj: any): string {
+  return JSON.stringify(obj);
+}
+
+/**
+ * Combine the strings of generated code into a single interpolated string.
+ * Each element of `vals` is expected to be a string literal or a codegen'd
+ * call to a method returning a string.
+ */
+export function combineGeneratedStrings(vals: string[]): string {
+  return vals.join(' + ');
+}
diff --git a/modules/angular2/src/change_detection/codegen_logic_util.ts b/modules/angular2/src/change_detection/codegen_logic_util.ts
new file mode 100644
index 0000000000..c2d4431d4c
--- /dev/null
+++ b/modules/angular2/src/change_detection/codegen_logic_util.ts
@@ -0,0 +1,90 @@
+import {ListWrapper} from 'angular2/src/facade/collection';
+import {BaseException, Json} from 'angular2/src/facade/lang';
+import {CodegenNameUtil} from './codegen_name_util';
+import {codify, combineGeneratedStrings} from './codegen_facade';
+import {ProtoRecord, RecordType} from './proto_record';
+
+/**
+ * Class responsible for providing change detection logic for chagne detector classes.
+ */
+export class CodegenLogicUtil {
+  constructor(private _names: CodegenNameUtil, private _utilName: string) {}
+
+  /**
+   * Generates a statement which updates the local variable representing `protoRec` with the current
+   * value of the record.
+   */
+  genUpdateCurrentValue(protoRec: ProtoRecord): string {
+    var context = (protoRec.contextIndex == -1) ?
+                      this._names.getDirectiveName(protoRec.directiveIndex) :
+                      this._names.getLocalName(protoRec.contextIndex);
+    var argString =
+        ListWrapper.map(protoRec.args, (arg) => this._names.getLocalName(arg)).join(", ");
+
+    var rhs: string;
+    switch (protoRec.mode) {
+      case RecordType.SELF:
+        rhs = context;
+        break;
+
+      case RecordType.CONST:
+        rhs = codify(protoRec.funcOrValue);
+        break;
+
+      case RecordType.PROPERTY:
+        rhs = `${context}.${protoRec.name}`;
+        break;
+
+      case RecordType.SAFE_PROPERTY:
+        rhs = `${this._utilName}.isValueBlank(${context}) ? null : ${context}.${protoRec.name}`;
+        break;
+
+      case RecordType.LOCAL:
+        rhs = `${this._names.getLocalsAccessorName()}.get('${protoRec.name}')`;
+        break;
+
+      case RecordType.INVOKE_METHOD:
+        rhs = `${context}.${protoRec.name}(${argString})`;
+        break;
+
+      case RecordType.SAFE_INVOKE_METHOD:
+        rhs =
+            `${this._utilName}.isValueBlank(${context}) ? null : ${context}.${protoRec.name}(${argString})`;
+        break;
+
+      case RecordType.INVOKE_CLOSURE:
+        rhs = `${context}(${argString})`;
+        break;
+
+      case RecordType.PRIMITIVE_OP:
+        rhs = `${this._utilName}.${protoRec.name}(${argString})`;
+        break;
+
+      case RecordType.COLLECTION_LITERAL:
+        rhs = `${this._utilName}.${protoRec.name}(${argString})`;
+        break;
+
+      case RecordType.INTERPOLATE:
+        rhs = this._genInterpolation(protoRec);
+        break;
+
+      case RecordType.KEYED_ACCESS:
+        rhs = `${context}[${this._names.getLocalName(protoRec.args[0])}]`;
+        break;
+
+      default:
+        throw new BaseException(`Unknown operation ${protoRec.mode}`);
+    }
+    return `${this._names.getLocalName(protoRec.selfIndex)} = ${rhs};`;
+  }
+
+  _genInterpolation(protoRec: ProtoRecord): string {
+    var iVals = [];
+    for (var i = 0; i < protoRec.args.length; ++i) {
+      iVals.push(codify(protoRec.fixedArgs[i]));
+      iVals.push(`${this._utilName}.s(${this._names.getLocalName(protoRec.args[i])})`);
+    }
+    iVals.push(codify(protoRec.fixedArgs[protoRec.args.length]));
+    return combineGeneratedStrings(iVals);
+  }
+}
diff --git a/modules/angular2/src/transform/template_compiler/change_detector_codegen.dart b/modules/angular2/src/transform/template_compiler/change_detector_codegen.dart
index b7adb068bd..6aa0642153 100644
--- a/modules/angular2/src/transform/template_compiler/change_detector_codegen.dart
+++ b/modules/angular2/src/transform/template_compiler/change_detector_codegen.dart
@@ -1,8 +1,9 @@
 library angular2.transform.template_compiler.change_detector_codegen;
 
-import 'dart:convert' show JSON;
 import 'package:angular2/src/change_detection/change_detection_util.dart';
 import 'package:angular2/src/change_detection/coalesce.dart';
+import 'package:angular2/src/change_detection/codegen_facade.dart';
+import 'package:angular2/src/change_detection/codegen_logic_util.dart';
 import 'package:angular2/src/change_detection/codegen_name_util.dart';
 import 'package:angular2/src/change_detection/directive_record.dart';
 import 'package:angular2/src/change_detection/interfaces.dart';
@@ -73,27 +74,26 @@ class _CodegenState {
   final String _changeDetectionMode;
   final List<ProtoRecord> _records;
   final List<DirectiveRecord> _directiveRecords;
+  final CodegenLogicUtil _logic;
   final CodegenNameUtil _names;
   final bool _generateCheckNoChanges;
 
   _CodegenState._(this._changeDetectorDefId, this._contextTypeName,
       this._changeDetectorTypeName, String changeDetectionStrategy,
-      List<ProtoRecord> records, List<DirectiveRecord> directiveRecords,
+      this._records, this._directiveRecords, this._logic, this._names,
       this._generateCheckNoChanges)
-      : _records = records,
-        _directiveRecords = directiveRecords,
-        _names = new CodegenNameUtil(records, directiveRecords, _UTIL),
-        _changeDetectionMode = ChangeDetectionUtil
-            .changeDetectionMode(changeDetectionStrategy);
+      : _changeDetectionMode = ChangeDetectionUtil
+          .changeDetectionMode(changeDetectionStrategy);
 
   factory _CodegenState(String typeName, String changeDetectorTypeName,
       ChangeDetectorDefinition def) {
-    var protoRecords = new ProtoRecordBuilder();
-    def.bindingRecords
-        .forEach((rec) => protoRecords.add(rec, def.variableNames));
-    var records = coalesce(protoRecords.records);
+    var recBuilder = new ProtoRecordBuilder();
+    def.bindingRecords.forEach((rec) => recBuilder.add(rec, def.variableNames));
+    var protoRecords = coalesce(recBuilder.records);
+    var names = new CodegenNameUtil(protoRecords, def.directiveRecords, _UTIL);
+    var logic = new CodegenLogicUtil(names, _UTIL);
     return new _CodegenState._(def.id, typeName, changeDetectorTypeName,
-        def.strategy, records, def.directiveRecords,
+        def.strategy, protoRecords, def.directiveRecords, logic, names,
         def.generateCheckNoChanges);
   }
 
@@ -103,7 +103,7 @@ class _CodegenState {
         ${_genDeclareFields()}
 
         $_changeDetectorTypeName(dispatcher, protos, directiveRecords)
-          : super(${_encodeValue(_changeDetectorDefId)},
+          : super(${codify(_changeDetectorDefId)},
               dispatcher, protos, directiveRecords, '$_changeDetectionMode') {
           dehydrateDirectives(false);
         }
@@ -284,7 +284,7 @@ class _CodegenState {
     var oldValue = _names.getFieldName(r.selfIndex);
     var newValue = _names.getLocalName(r.selfIndex);
     var read = '''
-      ${_genUpdateCurrentValue(r)}
+      ${_logic.genUpdateCurrentValue(r)}
     ''';
 
     var check = '''
@@ -303,7 +303,7 @@ class _CodegenState {
       var condition = r.args.map((a) => _names.getChangeName(a)).join(' || ');
       if (r.isUsedByOtherRecord()) {
         return 'if ($condition) { $genCode } else { $newValue = $oldValue; }';
-      } else  {
+      } else {
         return 'if ($condition) { $genCode }';
       }
     } else {
@@ -311,85 +311,10 @@ class _CodegenState {
     }
   }
 
-  String _genUpdateCurrentValue(ProtoRecord r) {
-    var context = r.contextIndex == -1
-        ? _names.getDirectiveName(r.directiveIndex)
-        : _names.getLocalName(r.contextIndex);
-
-    var newValue = _names.getLocalName(r.selfIndex);
-    var argString = r.args.map((arg) => _names.getLocalName(arg)).join(', ');
-
-    var rhs;
-    switch (r.mode) {
-      case RecordType.SELF:
-        rhs = context;
-        break;
-
-      case RecordType.CONST:
-        rhs = _encodeValue(r.funcOrValue);
-        break;
-
-      case RecordType.PROPERTY:
-        rhs = '$context.${r.name}';
-        break;
-
-      case RecordType.SAFE_PROPERTY:
-        rhs = '${_UTIL}.isValueBlank(${context}) ? null : ${context}.${r.name}';
-        break;
-
-      case RecordType.LOCAL:
-        rhs = '${_names.getLocalsAccessorName()}.get("${r.name}")';
-        break;
-
-      case RecordType.INVOKE_METHOD:
-        rhs = '$context.${r.name}($argString)';
-        break;
-
-      case RecordType.SAFE_INVOKE_METHOD:
-        rhs = '${_UTIL}.isValueBlank(${context}) '
-            '? null : ${context}.${r.name}(${argString})';
-        break;
-
-      case RecordType.INVOKE_CLOSURE:
-        rhs = '$context($argString)';
-        break;
-
-      case RecordType.PRIMITIVE_OP:
-        rhs = '$_UTIL.${r.name}($argString)';
-        break;
-
-      case RecordType.COLLECTION_LITERAL:
-        rhs = '$_UTIL.${r.name}($argString)';
-        break;
-
-      case RecordType.INTERPOLATE:
-        rhs = _genInterpolation(r);
-        break;
-
-      case RecordType.KEYED_ACCESS:
-        rhs = '$context[${_names.getLocalName(r.args[0])}]';
-        break;
-
-      default:
-        throw new FormatException(
-            'Unknown operation ${r.mode}', r.expressionAsString);
-    }
-    return '$newValue = $rhs;';
-  }
-
-  String _genInterpolation(ProtoRecord r) {
-    var res = new StringBuffer();
-    for (var i = 0; i < r.args.length; ++i) {
-      var name = _names.getLocalName(r.args[i]);
-      res.write(
-          '${_encodeValue(r.fixedArgs[i])} "\$\{$name == null ? "" : $name\}" ');
-    }
-    res.write(_encodeValue(r.fixedArgs[r.args.length]));
-    return '$res';
-  }
-
   String _genChangeMarker(ProtoRecord r) {
-    return r.argumentToPureFunction ? "${this._names.getChangeName(r.selfIndex)} = true;" : "";
+    return r.argumentToPureFunction
+        ? "${this._names.getChangeName(r.selfIndex)} = true;"
+        : "";
   }
 
   String _genUpdateDirectiveOrElement(ProtoRecord r) {
@@ -438,7 +363,9 @@ class _CodegenState {
   String _maybeFirstInBinding(ProtoRecord r) {
     var prev = ChangeDetectionUtil.protoByIndex(_records, r.selfIndex - 1);
     var firstInBindng = prev == null || prev.bindingRecord != r.bindingRecord;
-    return firstInBindng ? "${_names.getFirstProtoInCurrentBinding()} = ${r.selfIndex};" : '';
+    return firstInBindng
+        ? "${_names.getFirstProtoInCurrentBinding()} = ${r.selfIndex};"
+        : '';
   }
 
   String _genAddToChanges(ProtoRecord r) {
@@ -485,9 +412,6 @@ class _CodegenState {
       }
     ''';
   }
-
-  String _encodeValue(funcOrValue) =>
-      JSON.encode(funcOrValue).replaceAll(r'$', r'\$');
 }
 
 const PROTO_CHANGE_DETECTOR_FACTORY_METHOD = 'newProtoChangeDetector';
diff --git a/modules/angular2/test/transform/integration/two_annotations_files/expected/bar.ng_deps.dart b/modules/angular2/test/transform/integration/two_annotations_files/expected/bar.ng_deps.dart
index 8aa611ed7f..3be081861a 100644
--- a/modules/angular2/test/transform/integration/two_annotations_files/expected/bar.ng_deps.dart
+++ b/modules/angular2/test/transform/integration/two_annotations_files/expected/bar.ng_deps.dart
@@ -51,7 +51,7 @@ class _MyComponent_ChangeDetector0
     }
     if (c_myNum0) {
       l_interpolate1 =
-          "Salad: " "${l_myNum0 == null ? "" : l_myNum0}" " is awesome";
+          "${"Salad: "}${_gen.ChangeDetectionUtil.s(l_myNum0)}${" is awesome"}";
       if (_gen.looseNotIdentical(l_interpolate1, this.interpolate1)) {
         if (throwOnChange) {
           this.throwOnChangeError(this.interpolate1, l_interpolate1);