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/*
* IzPack - Copyright 2001-2008 Julien Ponge, All Rights Reserved.
*
* http://izpack.org/
* http://izpack.codehaus.org/
*
* Copyright 2004 Chadwick McHenry
*
* 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.compiler;
import com.izforge.izpack.util.VariableSubstitutor;
import net.n3.nanoxml.XMLElement;
import org.apache.tools.ant.taskdefs.Execute;
import java.io.*;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Vector;
/**
* Sets a property by name, or set of properties (from file or resource) in the project. This is
* modeled after ant properties
*
*
* Properties are immutable: once a property is set it cannot be changed. They are most definately
* not variable.
*
*
* There are five ways to set properties:
*
*
By supplying both the name and value attributes.
*
By setting the file attribute with the filename of the property file to load. This
* property file has the format as defined by the file used in the class java.util.Properties.
*
By setting the environment attribute with a prefix to use. Properties will be
* defined for every environment variable by prefixing the supplied name and a period to the name of
* the variable.
*
*
* Combinations of the above are considered an error.
*
*
* The value part of the properties being set, might contain references to other properties. These
* references are resolved when the properties are set.
*
*
* This also holds for properties loaded from a property file.
*
*
* Properties are case sensitive.
*
*
* When specifying the environment attribute, it's value is used as a prefix to use when retrieving
* environment variables. This functionality is currently only implemented on select platforms.
*
*
* Thus if you specify environment="myenv" you will be able to access OS-specific
* environment variables via property names "myenv.PATH" or "myenv.TERM".
*
*
* Note also that properties are case sensitive, even if the environment variables on your operating
* system are not, e.g. it will be ${env.Path} not ${env.PATH} on Windows 2000.
*
*
* Note that when specifying either the prefix or environment
* attributes, if you supply a property name with a final "." it will not be doubled. ie
* environment="myenv." will still allow access of environment variables through
* "myenv.PATH" and "myenv.TERM".
*
*/
public class Property
{
protected String name;
protected String value;
protected File file;
// protected String resource;
// protected Path classpath;
protected String env;
// protected Reference ref;
protected String prefix;
protected XMLElement xmlProp;
protected CompilerConfig config;
protected Compiler compiler;
public Property(XMLElement xmlProp, CompilerConfig config)
{
this.xmlProp = xmlProp;
this.config = config;
this.compiler = config.getCompiler();
name = xmlProp.getAttribute("name");
value = xmlProp.getAttribute("value");
env = xmlProp.getAttribute("environment");
if (env != null && !env.endsWith("."))
{
env += ".";
}
prefix = xmlProp.getAttribute("prefix");
if (prefix != null && !prefix.endsWith("."))
{
prefix += ".";
}
String filename = xmlProp.getAttribute("file");
if (filename != null)
{
file = new File(filename);
}
}
/**
* get the value of this property
*
* @return the current value or the empty string
*/
public String getValue()
{
return toString();
}
/**
* get the value of this property
*
* @return the current value or the empty string
*/
public String toString()
{
return value == null ? "" : value;
}
/**
* Set the property in the project to the value. If the task was give a file, resource or env
* attribute here is where it is loaded.
*/
public void execute() throws CompilerException
{
if (name != null)
{
if (value == null)
{
config.parseError(xmlProp, "You must specify a value with the name attribute");
}
}
else
{
if (file == null && env == null)
{
config.parseError(xmlProp,
"You must specify file, or environment when not using the name attribute");
}
}
if (file == null && prefix != null)
{
config.parseError(xmlProp, "Prefix is only valid when loading from a file ");
}
if ((name != null) && (value != null))
{
addProperty(name, value);
}
else if (file != null)
{
loadFile(file);
}
else if (env != null)
{
loadEnvironment(env);
}
}
/**
* load properties from a file
*
* @param file file to load
*/
protected void loadFile(File file) throws CompilerException
{
Properties props = new Properties();
config.getPackagerListener().packagerMsg("Loading " + file.getAbsolutePath(),
PackagerListener.MSG_VERBOSE);
try
{
if (file.exists())
{
FileInputStream fis = new FileInputStream(file);
try
{
props.load(fis);
}
finally
{
if (fis != null)
{
fis.close();
}
}
addProperties(props);
}
else
{
config.getPackagerListener().packagerMsg(
"Unable to find property file: " + file.getAbsolutePath(),
PackagerListener.MSG_VERBOSE);
}
}
catch (IOException ex)
{
config.parseError(xmlProp, "Faild to load file: " + file.getAbsolutePath(), ex);
}
}
/**
* load the environment values
*
* @param prefix prefix to place before them
*/
protected void loadEnvironment(String prefix) throws CompilerException
{
Properties props = new Properties();
config.getPackagerListener().packagerMsg("Loading Environment " + prefix,
PackagerListener.MSG_VERBOSE);
Vector osEnv = Execute.getProcEnvironment();
for (Enumeration e = osEnv.elements(); e.hasMoreElements();)
{
String entry = (String) e.nextElement();
int pos = entry.indexOf('=');
if (pos == -1)
{
config.getPackagerListener().packagerMsg("Ignoring " + prefix,
PackagerListener.MSG_WARN);
}
else
{
props.put(prefix + entry.substring(0, pos), entry.substring(pos + 1));
}
}
addProperties(props);
}
/**
* Add a name value pair to the project property set
*
* @param name name of property
* @param value value to set
*/
protected void addProperty(String name, String value) throws CompilerException
{
value = compiler.replaceProperties(value);
compiler.addProperty(name, value);
}
/**
* iterate through a set of properties, resolve them then assign them
*/
protected void addProperties(Properties props) throws CompilerException
{
resolveAllProperties(props);
Enumeration e = props.keys();
while (e.hasMoreElements())
{
String name = (String) e.nextElement();
String value = props.getProperty(name);
if (prefix != null)
{
name = prefix + name;
}
addProperty(name, value);
}
}
/**
* resolve properties inside a properties object
*
* @param props properties to resolve
*/
private void resolveAllProperties(Properties props) throws CompilerException
{
VariableSubstitutor subs = new VariableSubstitutor(props);
subs.setBracesRequired(true);
for (Enumeration e = props.keys(); e.hasMoreElements();)
{
String name = (String) e.nextElement();
String value = props.getProperty(name);
int mods = -1;
do
{
StringReader read = new StringReader(value);
StringWriter write = new StringWriter();
try
{
mods = subs.substitute(read, write, "at");
// TODO: check for circular references. We need to know
// which
// variables were substituted to do that
props.put(name, value);
}
catch (IOException ex)
{
config.parseError(xmlProp, "Faild to load file: " + file.getAbsolutePath(),
ex);
}
}
while (mods != 0);
}
}
}
