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();
+	}
+
+}

org.springframework.integration.adapter/src/test/java/org/springframework/integration/adapter/file/RegexPatternFilenameFilterTests.java

@@ -0,0 +1,87 @@
+/*
+ * 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 static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+
+import org.junit.Test;
+
+import org.springframework.beans.TypeMismatchException;
+import org.springframework.beans.factory.BeanCreationException;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+import org.springframework.integration.ConfigurationException;
+
+/**
+ * @author Mark Fisher
+ */
+public class RegexPatternFilenameFilterTests {
+
+	@Test
+	public void testMatch() {
+		File file = new File("/some/path/test.txt");
+		RegexPatternFilenameFilter filter = new RegexPatternFilenameFilter();
+		filter.setPattern(Pattern.compile("[a-z]+\\.txt"));
+		assertTrue(filter.accept(file.getParentFile(), file.getName()));
+	}
+
+	@Test
+	public void testNoMatch() {
+		File file = new File("/some/path/Test.txt");
+		RegexPatternFilenameFilter filter = new RegexPatternFilenameFilter();
+		filter.setPattern(Pattern.compile("[a-z]+\\.txt"));
+		assertFalse(filter.accept(file.getParentFile(), file.getName()));
+	}
+
+	@Test(expected=ConfigurationException.class)
+	public void testPatternNotSet() {
+		File file = new File("/some/path/test.txt");
+		RegexPatternFilenameFilter filter = new RegexPatternFilenameFilter();
+		filter.accept(file.getParentFile(), file.getName());
+	}
+
+	@Test
+	public void testPatternEditorInContext() {
+		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
+				"regexPatternFilenameFilterTests.xml", this.getClass());
+		FilenameFilter filter = (FilenameFilter) context.getBean("filter");
+		File file = new File("/some/path/foo.txt");
+		assertTrue(filter.accept(file.getParentFile(), file.getName()));
+	}
+
+	@Test
+	public void testInvalidPatternSyntax() {
+		try {
+			new ClassPathXmlApplicationContext("invalidRegexPatternFilenameFilterTests.xml", this.getClass());
+			throw new IllegalStateException("context creation should have failed");
+		}
+		catch (Exception e) {
+			assertEquals(BeanCreationException.class, e.getClass());
+			Throwable cause1 = e.getCause();
+			assertEquals(TypeMismatchException.class, cause1.getClass());
+			Throwable cause2 = cause1.getCause();
+			assertEquals(PatternSyntaxException.class, cause2.getClass());
+		}
+	}
+
+}

org.springframework.integration.adapter/src/test/java/org/springframework/integration/adapter/file/invalidRegexPatternFilenameFilterTests.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans
+			http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
+
+	<bean id="filter" class="org.springframework.integration.adapter.file.RegexPatternFilenameFilter">
+		<property name="pattern" value="[fo+\.[tx]{3}"/>
+	</bean>
+
+</beans>

org.springframework.integration.adapter/src/test/java/org/springframework/integration/adapter/file/regexPatternFilenameFilterTests.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans
+			http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
+
+	<bean id="filter" class="org.springframework.integration.adapter.file.RegexPatternFilenameFilter">
+		<property name="pattern" value="fo+\.[tx]{3}"/>
+	</bean>
+
+</beans>