/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.util.List;
import java.util.zip.GZIPInputStream;
import com.rapidminer.operator.AbstractIOObject;
import com.rapidminer.operator.IOObject;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorDescription;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.UserError;
import com.rapidminer.parameter.ParameterType;
import com.rapidminer.parameter.ParameterTypeFile;
/**
* Generic reader for all types of IOObjects. Reads an IOObject from a file.
*
* @author Ingo Mierswa
* @version $Id: IOObjectReader.java,v 1.7 2008/07/29 15:32:00 ingomierswa Exp $
*/
public class IOObjectReader extends Operator {
/** The parameter name for "Filename of the object file." */
public static final String PARAMETER_OBJECT_FILE = "object_file";
public IOObjectReader(OperatorDescription description) {
super(description);
}
/** Writes the attribute set to a file. */
public IOObject[] apply() throws OperatorException {
File objectFile = getParameterAsFile(PARAMETER_OBJECT_FILE);
IOObject object = null;
try {
// try if the model was written as a serializable model
ObjectInputStream objectIn = new ObjectInputStream(new FileInputStream(objectFile));
object = (IOObject)objectIn.readObject();
objectIn.close();
} catch (Exception e) {
log("Cannot deserialize binary object, trying XML deserialization...");
// if not serialized, then try the usual serialization (xml)
InputStream in = null;
try {
in = new GZIPInputStream(new FileInputStream(objectFile));
} catch (IOException e1) {
try {
// maybe already uncompressed?
in = new FileInputStream(objectFile);
} catch (IOException e2) {
throw new UserError(this, e, 302, new Object[] { objectFile, e2.getMessage() });
}
}
try {
object = AbstractIOObject.read(in);
} catch (IOException e3) {
throw new UserError(this, e, 302, new Object[] { objectFile, e3.getMessage() });
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e1) {
logError("Cannot close stream to file " + objectFile);
}
}
}
}
if (object == null) {
throw new UserError(this, 302, new Object[] { objectFile, "cannot load object file" });
} else {
return new IOObject[] { object };
}
}
public Class<?>[] getInputClasses() {
return new Class[0];
}
public Class<?>[] getOutputClasses() {
return new Class[] { IOObject.class };
}
public List<ParameterType> getParameterTypes() {
List<ParameterType> types = super.getParameterTypes();
types.add(new ParameterTypeFile(PARAMETER_OBJECT_FILE, "Filename of the object file.", "ioo", false));
return types;
}
}