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package org.infinispan.commons.util;
import java.io.File;
import java.util.Map;
import java.util.Properties;
import org.infinispan.commons.logging.Log;
import org.infinispan.commons.logging.LogFactory;
/**
* A utility class for replacing properties in strings.
*
* @author Jason Dillon
* @author Scott Stark
* @author Claudio Vesco
* @author Adrian Brock
* @author Dimitris Andreadis
* @since 4.2
*/
public class StringPropertyReplacer {
private static final Log log = LogFactory.getLog(StringPropertyReplacer.class);
/**
* New line string constant
*/
public static final String NEWLINE = System.getProperty("line.separator", "\n");
/**
* File separator value
*/
private static final String FILE_SEPARATOR = File.separator;
/**
* Path separator value
*/
private static final String PATH_SEPARATOR = File.pathSeparator;
/**
* File separator alias
*/
private static final String FILE_SEPARATOR_ALIAS = "/";
/**
* Path separator alias
*/
private static final String PATH_SEPARATOR_ALIAS = ":";
// States used in property parsing
private static final int NORMAL = 0;
private static final int SEEN_DOLLAR = 1;
private static final int IN_BRACKET = 2;
/**
* Go through the input string and replace any occurance of ${p} with the
* System.getProperty(p) value. If there is no such property p defined, then
* the ${p} reference will remain unchanged.
*
* If the property reference is of the form ${p:v} and there is no such
* property p, then the default value v will be returned.
*
* If the property reference is of the form ${p1,p2} or ${p1,p2:v} then the
* primary and the secondary properties will be tried in turn, before
* returning either the unchanged input, or the default value.
*
* The property ${/} is replaced with System.getProperty("file.separator")
* value and the property ${:} is replaced with System.getProperty("path.separator").
*
* Environment variables are referenced by the env. prefix, for example ${env.PATH}
*
* @param string - the string with possible ${} references
* @return the input string with all property references replaced if any. If
* there are no valid references the input string will be returned.
*/
public static String replaceProperties(final String string) {
return replaceProperties(string, null);
}
/**
* Go through the input string and replace any occurance of ${p} with the
* props.getProperty(p) value. If there is no such property p defined, then
* the ${p} reference will remain unchanged.
*
* If the property reference is of the form ${p:v} and there is no such
* property p, then the default value v will be returned.
*
* If the property reference is of the form ${p1,p2} or ${p1,p2:v} then the
* primary and the secondary properties will be tried in turn, before
* returning either the unchanged input, or the default value.
*
* The property ${/} is replaced with System.getProperty("file.separator")
* value and the property ${:} is replaced with System.getProperty("path.separator").
*
* @param string - the string with possible ${} references
* @param props - the source for ${x} property ref values, null means use
* System.getProperty()
* @return the input string with all property references replaced if any. If
* there are no valid references the input string will be returned.
*/
public static String replaceProperties(final String string, final Properties props) {
if (string == null)
return null;
final char[] chars = string.toCharArray();
StringBuilder buffer = new StringBuilder();
boolean properties = false;
int state = NORMAL;
int start = 0;
for (int i = 0; i < chars.length; ++i) {
char c = chars[i];
// Dollar sign outside brackets
if (c == '$' && state != IN_BRACKET)
state = SEEN_DOLLAR;
// Open bracket immediatley after dollar
else if (c == '{' && state == SEEN_DOLLAR) {
buffer.append(string, start, i - 1);
state = IN_BRACKET;
start = i - 1;
}
// No open bracket after dollar
else if (state == SEEN_DOLLAR)
state = NORMAL;
// Closed bracket after open bracket
else if (c == '}' && state == IN_BRACKET) {
// No content
if (start + 2 == i) {
buffer.append("${}"); // REVIEW: Correct?
} else // Collect the system property
{
String value;
String key = string.substring(start + 2, i);
// check for alias
if (FILE_SEPARATOR_ALIAS.equals(key)) {
value = FILE_SEPARATOR;
} else if (PATH_SEPARATOR_ALIAS.equals(key)) {
value = PATH_SEPARATOR;
} else {
// check from the properties
value = resolveKey(key, props);
if (value == null) {
// Check for a default value ${key:default}
int colon = key.indexOf(':');
if (colon > 0) {
String realKey = key.substring(0, colon);
value = resolveKey(realKey, props);
if (value == null) {
// Check for a composite key, "key1,key2"
value = resolveCompositeKey(realKey, props);
// Not a composite key either, use the specified default
if (value == null)
value = key.substring(colon + 1);
}
} else {
// No default, check for a composite key, "key1,key2"
value = resolveCompositeKey(key, props);
}
}
}
if (value != null) {
properties = true;
buffer.append(value);
} else {
buffer.append("${");
buffer.append(key);
buffer.append('}');
log.propertyCouldNotBeReplaced(key);
}
}
start = i + 1;
state = NORMAL;
}
}
// No properties
if (!properties)
return string;
// Collect the trailing characters
if (start != chars.length)
buffer.append(string, start, chars.length);
// Done
return buffer.toString();
}
public static void replaceProperties(Map map, Properties properties) {
map.replaceAll((k, v) -> replaceProperties(v, properties));
}
/**
* Try to resolve a "key" from the provided properties by checking if it is
* actually a "key1,key2", in which case try first "key1", then "key2". If
* all fails, return null.
*
* It also accepts "key1," and ",key2".
*
* @param key the key to resolve
* @param props the properties to use
* @return the resolved key or null
*/
private static String resolveCompositeKey(String key, Properties props) {
String value = null;
// Look for the comma
int comma = key.indexOf(',');
if (comma > -1) {
// If we have a first part, try resolve it
if (comma > 0) {
// Check the first part
String key1 = key.substring(0, comma);
value = resolveKey(key1, props);
}
// Check the second part, if there is one and first lookup failed
if (value == null && comma < key.length() - 1) {
String key2 = key.substring(comma + 1);
value = resolveKey(key2, props);
}
}
// Return whatever we've found or null
return value;
}
private static String resolveKey(String key, Properties props) {
if (key.startsWith("env.")) {
return System.getenv(key.substring(4));
} else if (props != null) {
return props.getProperty(key);
} else {
return System.getProperty(key);
}
}
}
