Added RegexPatternFilenameFilter (INT-252).

org.springframework.integration.adapter/src/main/java/org/springframework/integration/adapter/file/RegexPatternFilenameFilter.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2002-2008 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.integration.adapter.file;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.util.regex.Pattern;
+
+import org.springframework.integration.ConfigurationException;
+
+/**
+ * A {@link FilenameFilter} implementation for matching against
+ * a regular expression {@link Pattern}.
+ * 
+ * @author Mark Fisher
+ */
+public class RegexPatternFilenameFilter implements FilenameFilter {
+
+	private volatile Pattern pattern;
+
+
+	public void setPattern(Pattern pattern) {
+		this.pattern = pattern;
+	}
+
+
+	public boolean accept(File dir, String name) {
+		if (this.pattern == null) {
+			throw new ConfigurationException("no pattern available");
+		}
+		return this.pattern.matcher(name).matches();
+	}
+
+}