Added InboundFileAdapter

spring-eai-core/src/main/java/org/springframework/integration/endpoint/file/InboundFileAdapter.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2002-2007 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.endpoint.file;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.FilenameFilter;
+
+import org.springframework.integration.MessageHandlingException;
+import org.springframework.integration.endpoint.AbstractInboundChannelAdapter;
+import org.springframework.util.Assert;
+import org.springframework.util.FileCopyUtils;
+
+/**
+ * A basic inbound channel adapter for polling a directory.
+ * 
+ * @author Mark Fisher
+ */
+public class InboundFileAdapter extends AbstractInboundChannelAdapter {
+
+	private File directory;
+
+	private File copyToDirectory;
+
+	private FileFilter fileFilter;
+
+	private FilenameFilter filenameFilter;
+
+	private boolean isTextFile = true;
+
+
+	public InboundFileAdapter(File directory) {
+		Assert.notNull("directory must not be null");
+		this.directory = directory;
+	}
+
+	public void setCopyToDirectory(File copyToDirectory) {
+		this.copyToDirectory = copyToDirectory;
+	}
+
+	public void setFileFilter(FileFilter fileFilter) {
+		this.fileFilter = fileFilter;
+	}
+
+	public void setFilenameFilter(FilenameFilter filenameFilter) {
+		this.filenameFilter = filenameFilter;
+	}
+
+	public void setIsTextFile(boolean isTextFile) {
+		this.isTextFile = isTextFile;
+	}
+
+
+	@Override
+	protected Object doReceiveObject() {
+		System.out.println("polling");
+		File[] files = null;
+		if (this.fileFilter != null) {
+			files = this.directory.listFiles(fileFilter);
+		}
+		else if (this.filenameFilter != null) {
+			files = this.directory.listFiles(filenameFilter);
+		}
+		else {
+			files = this.directory.listFiles();
+		}
+		if (files == null) {
+			throw new MessageHandlingException("Problem occurred while polling for files. " +
+					"Is '" + directory.getAbsolutePath() + "' a directory?");
+		}
+		if (files.length == 0) {
+			return null;
+		}
+		File file = files[0];
+		try {
+			if (this.isTextFile) {
+				FileReader reader = new FileReader(file);
+				String result = FileCopyUtils.copyToString(reader);
+				if (this.copyToDirectory != null) {
+					FileWriter writer = new FileWriter(this.copyToDirectory.getAbsolutePath() + File.separator + file.getName());
+					FileCopyUtils.copy(new FileReader(file), writer);
+				}
+				file.delete();
+				return result;
+			}
+			return FileCopyUtils.copyToByteArray(file);
+		}
+		catch (Exception e) {
+			e.printStackTrace();
+			throw new MessageHandlingException("Failed to extract message", e);
+		}
+	}
+
+}