Extract ProblemCollector interface

org.springframework.beans/src/main/java/org/springframework/beans/factory/parsing/ProblemCollector.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2002-2011 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.beans.factory.parsing;
+
+/**
+ * TODO SPR-7420: document
+ *
+ * @author Chris Beams
+ * @since 3.1
+ */
+public interface ProblemCollector {
+
+	void error(String message);
+
+	void error(String message, Throwable cause);
+
+	void reportProblems(ProblemReporter reporter);
+
+	boolean hasErrors();
+
+}

org.springframework.beans/src/main/java/org/springframework/beans/factory/parsing/SimpleProblemCollector.java

@@ -27,7 +27,7 @@ import org.springframework.core.io.DescriptiveResource;
  * @author Chris Beams
  * @since 3.1
  */
-public class SimpleProblemCollector {
+public class SimpleProblemCollector implements ProblemCollector {
 
 	private Location location = null;
 	private List<Problem> errors = new ArrayList<Problem>();