com.izforge.izpack.installer.unpacker.ScriptParser Maven / Gradle / Ivy
/*
* IzPack - Copyright 2001-2008 Julien Ponge, All Rights Reserved.
*
* http://izpack.org/
* http://izpack.codehaus.org/
*
* Copyright 2001 Johannes Lehtinen
*
* 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 com.izforge.izpack.installer.unpacker;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.logging.Logger;
import com.izforge.izpack.api.substitutor.VariableSubstitutor;
import com.izforge.izpack.api.data.ParsableFile;
import com.izforge.izpack.util.PlatformModelMatcher;
/**
* A {@link ParsableFile} parser.
*
* @author Julien Ponge
* @author Johannes Lehtinen
*/
public class ScriptParser
{
private static final Logger logger = Logger.getLogger(ScriptParser.class.getName());
/**
* The variable replacer.
*/
private final VariableSubstitutor replacer;
/**
* The platform-model matcher.
*/
private final PlatformModelMatcher matcher;
/**
* Constructs a new parser. The parsable files specified must have pretranslated paths
* (variables expanded and file separator characters converted if necessary).
*
* @param replacer the variable replacer to use
* @param matcher the platform-model matcher
*/
public ScriptParser(VariableSubstitutor replacer, PlatformModelMatcher matcher)
{
this.replacer = replacer;
this.matcher = matcher;
}
/**
* Parses a file.
*
* @param parsable the file to parse
* @throws Exception if parsing fails
*/
public void parse(ParsableFile parsable) throws Exception
{
// check whether the OS matches
if (!matcher.matchesCurrentPlatform(parsable.getOsConstraints()))
{
return;
}
// Create a temporary file for the parsed data
// (Use the same directory so that renaming works later)
File file = new File(parsable.getPath());
logger.fine("Parsing and replacing variables in file " + file + "...");
File parsedFile;
try
{
parsedFile = File.createTempFile("izpp", null, file.getParentFile());
}
catch (IOException exception)
{
throw new IOException("Failed to create temporary file for " + parsable.getPath() + " in directory "
+ file.getParentFile(), exception);
}
// Parses the file
// (Use buffering because substitutor processes byte at a time)
FileInputStream inFile = new FileInputStream(file);
BufferedInputStream in = new BufferedInputStream(inFile, 5120);
FileOutputStream outFile = new FileOutputStream(parsedFile);
BufferedOutputStream out = new BufferedOutputStream(outFile, 5120);
replacer.substitute(in, out, parsable.getType(), parsable.getEncoding());
in.close();
out.close();
// Replace the original file with the parsed one
if (!file.delete())
{
throw new IOException("Failed to delete file: " + file);
}
if (!parsedFile.renameTo(file))
{
throw new IOException("Could not rename file " + parsedFile + " to " + file);
}
}
}