LocalGlobalVariable.java
- /**
- * **** BEGIN LICENSE BLOCK *****
- * Version: EPL 1.0/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Eclipse Public
- * License Version 1.0 (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.eclipse.org/legal/epl-v10.html
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * Copyright (C) 2009-2012 Yoko Harada <yokolet@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the EPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the EPL, the GPL or the LGPL.
- * **** END LICENSE BLOCK *****
- */
- package org.jruby.embed.variable;
- import java.util.Set;
- import org.jruby.Ruby;
- import org.jruby.RubyObject;
- import org.jruby.embed.internal.BiVariableMap;
- import org.jruby.internal.runtime.GlobalVariables;
- import org.jruby.runtime.builtin.IRubyObject;
- /**
- * An implementation of BiVariable for JSR223 style global variable. The assigned
- * name is like a local variables in Java, but a global in Ruby.
- *
- * @author Yoko Harada <yokolet@gmail.com>
- */
- public class LocalGlobalVariable extends GlobalVariable {
- private static String pattern = "([a-zA-Z]|(_([a-zA-Z]|_|\\d)))([a-zA-Z]|_|\\d)*";
- /**
- * Returns an instance of this class. This factory method is used when a local
- * global type variable is put into {@link BiVariableMap}.
- *
- * @param runtime Ruby runtime
- * @param name a variable name
- * @param javaObject Java object that should be assigned to.
- * @return the instance of LocalGlobalVariable
- */
- public static BiVariable getInstance(RubyObject receiver, String name, Object... javaObject) {
- if (name.matches(pattern)) {
- return new LocalGlobalVariable(receiver, name, javaObject);
- }
- return null;
- }
- private LocalGlobalVariable(RubyObject receiver, String name, Object... javaObject) {
- super(receiver, name, javaObject);
- }
- /**
- * A constructor used when local global type variables are retrieved from Ruby.
- *
- * @param name the local global type variable name
- * @param irubyObject Ruby global object
- */
- LocalGlobalVariable(IRubyObject receiver, String name, IRubyObject irubyObject) {
- super(receiver, name, irubyObject);
- }
- /**
- * Retrieves global variables eagerly from Ruby right after the evaluation. The
- * variable names to be retrieved must be in a variable map.
- *
- * @param receiver receiver object returned when a script is evaluated.
- * @param vars map to save retrieved global variables.
- */
- public static void retrieve(RubyObject receiver, BiVariableMap vars) {
- if (vars.isLazy()) return;
-
- GlobalVariables gvars = receiver.getRuntime().getGlobalVariables();
- Set<String> names = gvars.getNames();
- for (String name : names) {
- if (isPredefined(name)) {
- continue;
- }
- IRubyObject value = gvars.get(name);
- String javaName = name.substring(1); // eliminates a preceding character, "$"
- updateLocalGlobal((RubyObject)receiver.getRuntime().getTopSelf(), vars, javaName, value);
- }
- }
- private static void updateLocalGlobal(RubyObject receiver, BiVariableMap vars, String name, IRubyObject value) {
- BiVariable var;
- if (vars.containsKey((Object) name)) {
- var = vars.getVariable(receiver, name);
- var.setRubyObject(value);
- } else {
- var = new LocalGlobalVariable(receiver, name, value);
- vars.update(name, var);
- }
- }
- /**
- * Retrieves a global variable by key from Ruby runtime after the evaluation.
- * This method is used when eager retrieval is off.
- *
- * @param runtime Ruby runtime
- * @param vars map to save a retrieved global variable.
- * @param key name of the global variable
- */
- public static void retrieveByKey(Ruby runtime, BiVariableMap vars, String key) {
- GlobalVariables gvars = runtime.getGlobalVariables();
- // if the specified key doesn't exist, this method is called before the
- // evaluation. Don't update value in this case.
- String rubyKey = ("$" + key).intern();
- if (!gvars.getNames().contains(rubyKey)) return;
- // the specified key is found, so let's update
- IRubyObject value = gvars.get(rubyKey);
- updateLocalGlobal((RubyObject)runtime.getTopSelf(), vars, key, value);
- }
- /**
- * Returns enum type of this variable defined in {@link BiVariable}.
- *
- * @return this enum type, BiVariable.Type.GlobalVariable.
- */
- @Override
- public Type getType() {
- return Type.LocalGlobalVariable;
- }
- /**
- * Returns true if the given name is a local global type variable. Unless
- * returns false.
- *
- * @param name is a name to be checked.
- * @return true if the given name is of a local global type variable.
- */
- public static boolean isValidName(Object name) {
- return isValidName(pattern, name);
- }
- /**
- * Injects a global value to a parsed Ruby script. This method is
- * invoked during EvalUnit#run() is executed.
- */
- @Override
- public void inject() {
- synchronized (receiver.getRuntime()) {
- String varname = (name.startsWith("$") ? name : "$" + name);
- receiver.getRuntime().getGlobalVariables().set(varname.intern(), irubyObject);
- }
- }
- /**
- * Removes this object from {@link BiVariableMap}.
- *
- * @param runtime environment where a variable is removed.
- */
- @Override
- public void remove() {
- synchronized (receiver.getRuntime()) {
- String varname = (name.startsWith("$") ? name : "$" + name);
- receiver.getRuntime().getGlobalVariables().clear(varname.intern());
- }
- }
- }