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/*
* 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.util;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
/**
* Substitutes variables occurring in an input stream or a string. This implementation supports a
* generic variable value mapping and escapes the possible special characters occurring in the
* substituted values. The file types specifically supported are plain text files (no escaping),
* Java properties files, and XML files. A valid variable name matches the regular expression
* [a-zA-Z][a-zA-Z0-9_]* and names are case sensitive. Variables are referenced either by $NAME or
* ${NAME} (the latter syntax being useful in situations like ${NAME}NOTPARTOFNAME). If a referenced
* variable is undefined then it is not substituted but the corresponding part of the stream is
* copied as is.
*
* @author Johannes Lehtinen
*/
public class VariableSubstitutor implements Serializable
{
/**
*
*/
private static final long serialVersionUID = 3907213762447685687L;
/**
* The variable value mappings
*/
protected transient Properties variables;
/**
* Whether braces are required for substitution.
*/
protected boolean bracesRequired = false;
/**
* A constant for file type. Plain file.
*/
protected final static int TYPE_PLAIN = 0;
/**
* A constant for file type. Java properties file.
*/
protected final static int TYPE_JAVA_PROPERTIES = 1;
/**
* A constant for file type. XML file.
*/
protected final static int TYPE_XML = 2;
/**
* A constant for file type. Shell file.
*/
protected final static int TYPE_SHELL = 3;
/**
* A constant for file type. Plain file with '@' start char.
*/
protected final static int TYPE_AT = 4;
/**
* A constant for file type. Java file, where \ have to be escaped.
*/
protected final static int TYPE_JAVA = 5;
/**
* A constant for file type. Plain file with ANT-like variable markers, ie @param@
*/
protected final static int TYPE_ANT = 6;
/**
* PLAIN = "plain"
*/
public final static String PLAIN = "plain";
/**
* A mapping of file type names to corresponding integer constants.
*/
protected final static Map typeNameToConstantMap;
// Initialize the file type map
static
{
typeNameToConstantMap = new HashMap();
typeNameToConstantMap.put("plain", TYPE_PLAIN);
typeNameToConstantMap.put("javaprop", TYPE_JAVA_PROPERTIES);
typeNameToConstantMap.put("java", TYPE_JAVA);
typeNameToConstantMap.put("xml", TYPE_XML);
typeNameToConstantMap.put("shell", TYPE_SHELL);
typeNameToConstantMap.put("at", TYPE_AT);
typeNameToConstantMap.put("ant", TYPE_ANT);
}
/**
* Constructs a new substitutor using the specified variable value mappings. The environment
* hashtable is copied by reference. Braces are not required by default
*
* @param variables the map with variable value mappings
*/
public VariableSubstitutor(Properties variables)
{
this.variables = variables;
}
/**
* Get whether this substitutor requires braces.
*/
public boolean areBracesRequired()
{
return bracesRequired;
}
/**
* Specify whether this substitutor requires braces.
*/
public void setBracesRequired(boolean braces)
{
bracesRequired = braces;
}
/**
* Substitutes the variables found in the specified string. Escapes special characters using
* file type specific escaping if necessary.
*
* @param str the string to check for variables
* @param type the escaping type or null for plain
* @return the string with substituted variables
* @throws IllegalArgumentException if unknown escaping type specified
*/
public String substitute(String str, String type) throws IllegalArgumentException
{
if (str == null)
{
return null;
}
// Create reader and writer for the strings
StringReader reader = new StringReader(str);
StringWriter writer = new StringWriter();
// Substitute any variables
try
{
substitute(reader, writer, type);
}
catch (IOException e)
{
throw new Error("Unexpected I/O exception when reading/writing memory "
+ "buffer; nested exception is: " + e);
}
// Return the resulting string
return writer.getBuffer().toString();
}
/**
* Substitutes the variables found in the specified input stream. Escapes special characters
* using file type specific escaping if necessary.
*
* @param in the input stream to read
* @param out the output stream to write
* @param type the file type or null for plain
* @param encoding the character encoding or null for default
* @return the number of substitutions made
* @throws IllegalArgumentException if unknown file type specified
* @throws UnsupportedEncodingException if encoding not supported
* @throws IOException if an I/O error occurs
*/
public int substitute(InputStream in, OutputStream out, String type, String encoding)
throws IllegalArgumentException, UnsupportedEncodingException, IOException
{
// Check if file type specific default encoding known
if (encoding == null)
{
int t = getTypeConstant(type);
switch (t)
{
case TYPE_JAVA_PROPERTIES:
encoding = "ISO-8859-1";
break;
case TYPE_XML:
encoding = "UTF-8";
break;
}
}
// Create the reader and writer
InputStreamReader reader = (encoding != null ? new InputStreamReader(in, encoding)
: new InputStreamReader(in));
OutputStreamWriter writer = (encoding != null ? new OutputStreamWriter(out, encoding)
: new OutputStreamWriter(out));
// Copy the data and substitute variables
int subs = substitute(reader, writer, type);
// Flush the writer so that everything gets written out
writer.flush();
return subs;
}
/**
* Substitute method Variant that gets An Input Stream and returns A String
*
* @param in The Input Stream, with Placeholders
* @param type The used FormatType
* @return the substituted result as string
* @throws IllegalArgumentException If a wrong input was given.
* @throws UnsupportedEncodingException If the file comes with a wrong Encoding
* @throws IOException If an I/O Error occurs.
*/
public String substitute(InputStream in, String type
)
throws IllegalArgumentException, UnsupportedEncodingException,
IOException
{
// Check if file type specific default encoding known
String encoding = PLAIN;
{
int t = getTypeConstant(type);
switch (t)
{
case TYPE_JAVA_PROPERTIES:
encoding = "ISO-8859-1";
break;
case TYPE_XML:
encoding = "UTF-8";
break;
}
}
// Create the reader and writer
InputStreamReader reader = ((encoding != null)
? new InputStreamReader(in, encoding)
: new InputStreamReader(in));
StringWriter writer = new StringWriter();
// Copy the data and substitute variables
substitute(reader, writer, type);
// Flush the writer so that everything gets written out
writer.flush();
return writer.getBuffer().toString();
}
/**
* Substitutes the variables found in the data read from the specified reader. Escapes special
* characters using file type specific escaping if necessary.
*
* @param reader the reader to read
* @param writer the writer used to write data out
* @param type the file type or null for plain
* @return the number of substitutions made
* @throws IllegalArgumentException if unknown file type specified
* @throws IOException if an I/O error occurs
*/
public int substitute(Reader reader, Writer writer, String type)
throws IllegalArgumentException, IOException
{
// Check the file type
int t = getTypeConstant(type);
// determine character which starts (and ends) a variable
char variable_start = '$';
char variable_end = '\0';
if (t == TYPE_SHELL)
{
variable_start = '%';
}
else if (t == TYPE_AT)
{
variable_start = '@';
}
else if (t == TYPE_ANT)
{
variable_start = '@';
variable_end = '@';
}
int subs = 0;
// Copy data and substitute variables
int c = reader.read();
// Ignore BOM of UTF-8
if (c == 0xEF)
{
for (int i = 0; i < 2; i++)
{
c = reader.read();
}
}
// Ignore quaint return values at UTF-8 BOMs.
if (c > 0xFF)
{
c = reader.read();
}
while (true)
{
// Find the next potential variable reference or EOF
while (c != -1 && c != variable_start)
{
writer.write(c);
c = reader.read();
}
if (c == -1)
{
return subs;
}
// Check if braces used or start char escaped
boolean braces = false;
c = reader.read();
if (c == '{')
{
braces = true;
c = reader.read();
}
else if (bracesRequired)
{
writer.write(variable_start);
continue;
}
else if (c == -1)
{
writer.write(variable_start);
return subs;
}
// Read the variable name
StringBuffer nameBuffer = new StringBuffer();
while (c != -1 && (braces && c != '}') || (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z') || (braces && (c == '[') || (c == ']'))
|| (((c >= '0' && c <= '9') || c == '_' || c == '.' || c == '-') && nameBuffer.length() > 0))
{
nameBuffer.append((char) c);
c = reader.read();
}
String name = nameBuffer.toString();
// Check if a legal and defined variable found
String varvalue = null;
if (((!braces || c == '}') &&
(!braces || variable_end == '\0' || variable_end == c)
) && name.length() > 0)
{
// check for environment variables
if (braces && name.startsWith("ENV[")
&& (name.lastIndexOf(']') == name.length() - 1))
{
varvalue = IoHelper.getenv(name.substring(4, name.length() - 1));
}
else
{
varvalue = variables.getProperty(name);
}
subs++;
}
// Substitute the variable...
if (varvalue != null)
{
writer.write(escapeSpecialChars(varvalue, t));
if (braces || variable_end != '\0')
{
c = reader.read();
}
}
// ...or ignore it
else
{
writer.write(variable_start);
if (braces)
{
writer.write('{');
}
writer.write(name);
}
}
}
/**
* Returns the internal constant for the specified file type.
*
* @param type the type name or null for plain
* @return the file type constant
*/
protected int getTypeConstant(String type)
{
if (type == null)
{
return TYPE_PLAIN;
}
Integer integer = typeNameToConstantMap.get(type);
if (integer == null)
{
throw new IllegalArgumentException("Unknown file type " + type);
}
else
{
return integer;
}
}
/**
* Escapes the special characters in the specified string using file type specific rules.
*
* @param str the string to check for special characters
* @param type the target file type (one of TYPE_xxx)
* @return the string with the special characters properly escaped
*/
protected String escapeSpecialChars(String str, int type)
{
StringBuffer buffer;
int len;
int i;
switch (type)
{
case TYPE_PLAIN:
case TYPE_SHELL:
case TYPE_AT:
case TYPE_ANT:
return str;
case TYPE_JAVA_PROPERTIES:
case TYPE_JAVA:
buffer = new StringBuffer(str);
len = str.length();
for (i = 0; i < len; i++)
{
// Check for control characters
char c = buffer.charAt(i);
if (type == TYPE_JAVA_PROPERTIES)
{
if (c == '\t' || c == '\n' || c == '\r')
{
char tag;
if (c == '\t')
{
tag = 't';
}
else if (c == '\n')
{
tag = 'n';
}
else
{
tag = 'r';
}
buffer.replace(i, i + 1, "\\" + tag);
len++;
i++;
}
// Check for special characters
if (c == '\\' || c == '"' || c == '\'' || c == ' ')
{
buffer.insert(i, '\\');
len++;
i++;
}
}
else
{
if (c == '\\')
{
buffer.replace(i, i + 1, "\\\\");
len++;
i++;
}
}
}
return buffer.toString();
case TYPE_XML:
buffer = new StringBuffer(str);
len = str.length();
for (i = 0; i < len; i++)
{
String r = null;
char c = buffer.charAt(i);
switch (c)
{
case '<':
r = "<";
break;
case '>':
r = ">";
break;
case '&':
r = "&";
break;
case '\'':
r = "'";
break;
case '"':
r = """;
break;
}
if (r != null)
{
buffer.replace(i, i + 1, r);
len = buffer.length();
i += r.length() - 1;
}
}
return buffer.toString();
default:
throw new Error("Unknown file type constant " + type);
}
}
}
