/****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* distributed with this work for additional information *
* regarding copyright ownership. The ASF licenses this file *
* to you 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.apache.james.mailrepository;
import org.apache.avalon.cornerstone.services.store.StreamRepository;
import org.apache.james.core.MimeMessageSource;
import org.apache.james.util.JDBCUtil;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* This class points to a specific message in a repository. This will return an
* InputStream to the JDBC field/record, possibly sequenced with the file stream.
*/
public class MimeMessageJDBCSource extends MimeMessageSource {
/**
* Whether 'deep debugging' is turned on.
*/
private static final boolean DEEP_DEBUG = false;
//Define how to get to the data
JDBCMailRepository repository = null;
String key = null;
StreamRepository sr = null;
private long size = -1;
/**
* SQL used to retrieve the message body
*/
String retrieveMessageBodySQL = null;
/**
* SQL used to retrieve the size of the message body
*/
String retrieveMessageBodySizeSQL = null;
/**
* The JDBCUtil helper class
*/
private static final JDBCUtil theJDBCUtil =
new JDBCUtil() {
protected void delegatedLog(String logString) {
// No logging available at this point in the code.
// Therefore this is a noop method.
}
};
/**
* Construct a MimeMessageSource based on a JDBC repository, a key, and a
* stream repository (where we might store the message body)
*/
public MimeMessageJDBCSource(JDBCMailRepository repository,
String key, StreamRepository sr) throws IOException {
if (repository == null) {
throw new IOException("Repository is null");
}
if (key == null) {
throw new IOException("Message name (key) was not defined");
}
this.repository = repository;
this.key = key;
this.sr = sr;
retrieveMessageBodySQL =
repository.sqlQueries.getSqlString("retrieveMessageBodySQL", true);
// this is optional
retrieveMessageBodySizeSQL =
repository.sqlQueries.getSqlString("retrieveMessageBodySizeSQL");
}
/**
* Returns a unique String ID that represents the location from where
* this source is loaded. This will be used to identify where the data
* is, primarily to avoid situations where this data would get overwritten.
*
* @return the String ID
*/
public String getSourceId() {
StringBuffer sourceIdBuffer =
new StringBuffer(128)
.append(repository.repositoryName)
.append("/")
.append(key);
return sourceIdBuffer.toString();
}
/**
* Return the input stream to the database field and then the file stream. This should
* be smart enough to work even if the file does not exist. This is to support
* a repository with the entire message in the database, which is how James 1.2 worked.
*/
public synchronized InputStream getInputStream() throws IOException {
Connection conn = null;
PreparedStatement retrieveMessageStream = null;
ResultSet rsRetrieveMessageStream = null;
try {
conn = repository.getConnection();
byte[] headers = null;
long start = 0;
if (DEEP_DEBUG) {
start = System.currentTimeMillis();
System.out.println("starting");
}
retrieveMessageStream = conn.prepareStatement(retrieveMessageBodySQL);
retrieveMessageStream.setString(1, key);
retrieveMessageStream.setString(2, repository.repositoryName);
rsRetrieveMessageStream = retrieveMessageStream.executeQuery();
if (!rsRetrieveMessageStream.next()) {
throw new IOException("Could not find message");
}
String getBodyOption = repository.sqlQueries.getDbOption("getBody");
if (getBodyOption != null && getBodyOption.equalsIgnoreCase("useBlob")) {
Blob b = rsRetrieveMessageStream.getBlob(1);
headers = b.getBytes(1, (int)b.length());
} else {
headers = rsRetrieveMessageStream.getBytes(1);
}
if (DEEP_DEBUG) {
System.err.println("stopping");
System.err.println(System.currentTimeMillis() - start);
}
InputStream in = new ByteArrayInputStream(headers);
try {
if (sr != null) {
in = new SequenceInputStream(in, sr.get(key));
}
} catch (Exception e) {
//ignore this... either sr is null, or the file does not exist
// or something else
}
return in;
} catch (SQLException sqle) {
throw new IOException(sqle.toString());
} finally {
theJDBCUtil.closeJDBCResultSet(rsRetrieveMessageStream);
theJDBCUtil.closeJDBCStatement(retrieveMessageStream);
theJDBCUtil.closeJDBCConnection(conn);
}
}
/**
* Runs a custom SQL statement to check the size of the message body
*/
public synchronized long getMessageSize() throws IOException {
if (size != -1) return size;
if (retrieveMessageBodySizeSQL == null) {
//There was no SQL statement for this repository... figure it out the hard way
System.err.println("no SQL statement to find size");
return size = super.getMessageSize();
}
Connection conn = null;
PreparedStatement retrieveMessageSize = null;
ResultSet rsRetrieveMessageSize = null;
try {
conn = repository.getConnection();
retrieveMessageSize = conn.prepareStatement(retrieveMessageBodySizeSQL);
retrieveMessageSize.setString(1, key);
retrieveMessageSize.setString(2, repository.repositoryName);
rsRetrieveMessageSize = retrieveMessageSize.executeQuery();
if (!rsRetrieveMessageSize.next()) {
throw new IOException("Could not find message");
}
size = rsRetrieveMessageSize.getLong(1);
InputStream in = null;
try {
if (sr != null) {
if (sr instanceof org.apache.james.mailrepository.filepair.File_Persistent_Stream_Repository) {
size += ((org.apache.james.mailrepository.filepair.File_Persistent_Stream_Repository) sr).getSize(key);
} else {
in = sr.get(key);
int len = 0;
byte[] block = new byte[1024];
while ((len = in.read(block)) > -1) {
size += len;
}
}
}
} catch (Exception e) {
//ignore this... either sr is null, or the file does not exist
// or something else
} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ioe) {
// Ignored - no access to logger at this point in the code
}
}
return size;
} catch (SQLException sqle) {
throw new IOException(sqle.toString());
} finally {
theJDBCUtil.closeJDBCResultSet(rsRetrieveMessageSize);
theJDBCUtil.closeJDBCStatement(retrieveMessageSize);
theJDBCUtil.closeJDBCConnection(conn);
}
}
/**
* Check to see whether this is the same repository and the same key
*/
public boolean equals(Object obj) {
if (obj instanceof MimeMessageJDBCSource) {
// TODO: Figure out whether other instance variables should be part of
// the equals equation
MimeMessageJDBCSource source = (MimeMessageJDBCSource)obj;
return ((source.key == key) || ((source.key != null) && source.key.equals(key))) &&
((source.repository == repository) || ((source.repository != null) && source.repository.equals(repository)));
}
return false;
}
/**
* Provide a hash code that is consistent with equals for this class
*
* @return the hash code
*/
public int hashCode() {
int result = 17;
if (key != null) {
result = 37 * key.hashCode();
}
if (repository != null) {
result = 37 * repository.hashCode();
}
return result;
}
}
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