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Draft for reading configuration from config files
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rhino/src/main/java/org/mozilla/javascript/RhinoConfig.java
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|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| package org.mozilla.javascript; | ||
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| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.InputStreamReader; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.security.AccessController; | ||
| import java.security.PrivilegedAction; | ||
| import java.util.Collections; | ||
| import java.util.Comparator; | ||
| import java.util.Locale; | ||
| import java.util.Map; | ||
| import java.util.Properties; | ||
| import java.util.TreeMap; | ||
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|
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| /** | ||
| * Utility class to read current rhino configuration. | ||
| * | ||
| * <p>Rhino properties typically begins with "rhino." (properties) or "RHINO_" (env) | ||
| * | ||
| * <p>The configuration is read from these locations: | ||
| * | ||
| * <ol> | ||
| * <li>rhino.config file from current class' classpath | ||
| * <li>rhino.config file from current threas's classpath | ||
| * <li>rhino.config file from current directory | ||
| * <li>System-properties starting with "rhino." | ||
| * <li>env variables starting with "RHINO_" (underscores are replaced by '.' and string is | ||
| * </ol> | ||
| * | ||
| * The config files are in UTF-8 format and all keys in this configuration are case-insensitive and | ||
| * dot/underscore-insensitive. | ||
| * | ||
| * <p>This means, "rhino.use_java_policy_security" is equvalent to "RHINO_USE_JAVA_POLICY_SECURITY" | ||
| * | ||
| * @author Roland Praml, Foconis Analytics GmbH | ||
| */ | ||
| public class RhinoConfig { | ||
| private static final Map<String, String> PROPERTIES = | ||
| AccessController.doPrivileged((PrivilegedAction<Map<String, String>>) () -> init()); | ||
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| private static Map<String, String> init() { | ||
| // we have to add a comparator at least for environment: TODO: can this done simpler | ||
| Comparator<String> comparator = | ||
| (s1, s2) -> { | ||
| s1 = s1.toLowerCase(Locale.ROOT).replace('_', '.'); | ||
| s2 = s2.toLowerCase(Locale.ROOT).replace('_', '.'); | ||
| return s1.compareTo(s2); | ||
| }; | ||
| Map<String, String> map = new TreeMap<>(comparator); | ||
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| // load from classpaths | ||
| map.putAll(loadFromClasspath(RhinoConfig.class.getClassLoader())); | ||
| map.putAll(loadFromClasspath(Thread.currentThread().getContextClassLoader())); | ||
| map.putAll(loadFromFile(new File("rhino.config"))); | ||
| copyMap(System.getProperties(), map); | ||
| copyMap(System.getenv(), map); | ||
| System.out.println("Current config: " + map); | ||
| return map; | ||
| } | ||
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| /** Copies all rhino relevant properties. */ | ||
| private static void copyMap(Map<?, ?> src, Map<String, String> dst) { | ||
| for (Map.Entry<?, ?> entry : src.entrySet()) { | ||
| if (entry.getKey() instanceof String && entry.getValue() instanceof String) { | ||
| String key = (String) entry.getKey(); | ||
| if (key.startsWith("rhino.") || key.startsWith("RHINO_")) { | ||
| dst.put(key, (String) entry.getValue()); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| @SuppressWarnings("unchecked") | ||
| private static Map<String, String> loadFromFile(File config) { | ||
| if (config.exists()) { | ||
| try (InputStream in = new FileInputStream(config)) { | ||
| if (in != null) { | ||
| Properties props = new Properties(); | ||
| props.load(new InputStreamReader(in, StandardCharsets.UTF_8)); | ||
| System.out.println( | ||
| "Loaded rhino.config from " | ||
| + config.getAbsolutePath()); // TODO: remove these prints | ||
| return (Map) props; | ||
| } | ||
| } catch (IOException e) { | ||
| System.err.println( | ||
| "Error loading rhino.config from " | ||
| + config.getAbsolutePath() | ||
| + ": " | ||
| + e.getMessage()); | ||
| } | ||
| } | ||
| return Collections.emptyMap(); | ||
| } | ||
|
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||
| @SuppressWarnings("unchecked") | ||
| private static Map<String, String> loadFromClasspath(ClassLoader cl) { | ||
| if (cl != null) { | ||
| try (InputStream in = cl.getResourceAsStream("rhino.config")) { | ||
| if (in != null) { | ||
| Properties props = new Properties(); | ||
| props.load(new InputStreamReader(in, StandardCharsets.UTF_8)); | ||
| System.out.println( | ||
| "Loaded " | ||
| + props.size() | ||
| + " proerties from rhino.config in classpath"); // TODO: remove | ||
| // these prints | ||
| return (Map) props; | ||
| } | ||
| } catch (IOException e) { | ||
| System.err.println("Error loading rhino.config from classpath: " + e.getMessage()); | ||
| } | ||
| } | ||
| return Collections.emptyMap(); | ||
| } | ||
|
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| /** Replacement for {@link System#getProperty(String)}. */ | ||
| public static String getProperty(String key) { | ||
| return PROPERTIES.get(key); | ||
| } | ||
|
|
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| /** Replacement for {@link System#getProperty(String, String)}. */ | ||
| public static String getProperty(String key, String defaultValue) { | ||
| String val = getProperty(key); | ||
| return (val == null) ? defaultValue : val; | ||
| } | ||
|
|
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| /** Replacement for {@link Boolean#getBoolean(String)}. */ | ||
| public static boolean getBoolean(String name) { | ||
| boolean result = false; | ||
| try { | ||
| result = Boolean.parseBoolean(getProperty(name)); | ||
| } catch (IllegalArgumentException | NullPointerException e) { | ||
| } | ||
| return result; | ||
| } | ||
|
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| /** Replacement for {@link Integer#getInteger(String, Integer)}. */ | ||
| public static Integer getInteger(String nm, Integer val) { | ||
| String v = null; | ||
| try { | ||
| v = getProperty(nm); | ||
| } catch (IllegalArgumentException | NullPointerException e) { | ||
| } | ||
| if (v != null) { | ||
| try { | ||
| return Integer.decode(v); | ||
| } catch (NumberFormatException e) { | ||
| } | ||
| } | ||
| return val; | ||
| } | ||
|
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| /** Replacement for {@link Integer#getInteger(String, int)}. */ | ||
| public static Integer getInteger(String nm, int val) { | ||
| Integer result = getInteger(nm, null); | ||
| return (result == null) ? Integer.valueOf(val) : result; | ||
| } | ||
|
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| /** Replacement for {@link Integer#getInteger(String)}. */ | ||
| public static Integer getInteger(String nm) { | ||
| return getInteger(nm, null); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| rhino.helloFromFile=true |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| rhino.helloFromClasspath=true |