/projects/jruby-1.7.3/src/org/jruby/embed/variable/Constant.java
Java | 246 lines | 118 code | 17 blank | 111 comment | 36 complexity | 4e82bc3d81ad6f79d5f8515edbae5935 MD5 | raw file
- /**
- * **** BEGIN LICENSE BLOCK *****
- * Version: EPL 1.0/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Common 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/cpl-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.Collection;
- import java.util.List;
- import java.util.Map;
- import org.jruby.RubyModule;
- import org.jruby.RubyObject;
- import org.jruby.embed.internal.BiVariableMap;
- import org.jruby.javasupport.JavaUtil;
- import org.jruby.runtime.builtin.IRubyObject;
- /**
- * An implementation of BiVariable for a Ruby constant.
- *
- * @author Yoko Harada <yokolet@gmail.com>
- */
- public class Constant extends AbstractVariable {
- private static String pattern = "[A-Z]([a-zA-Z]|_)([a-zA-Z]|_|\\d)*";
- private boolean initialized = false;
- /**
- * Returns an instance of this class. This factory method is used when a constant
- * is put in {@link BiVariableMap}.
- *
- * @param runtime
- * @param name a variable name
- * @param javaObject Java object that should be assigned to.
- * @return the instance of Constant
- */
- public static BiVariable getInstance(RubyObject receiver, String name, Object... javaObject) {
- if (name.matches(pattern)) {
- return new Constant(receiver, name, javaObject);
- }
- return null;
- }
-
- private Constant(RubyObject receiver, String name, Object... javaObjects) {
- super(receiver, name, false);
- updateByJavaObject(receiver.getRuntime(), javaObjects);
- }
- /**
- * A constructor used when constants are retrieved from Ruby.
- *
- * @param receiver a receiver object that this variable/constant is originally in. When
- * the variable/constant is originated from Ruby, receiver may not be null.
- * @param name the constant name
- * @param irubyObject Ruby constant object
- */
- Constant(IRubyObject receiver, String name, IRubyObject irubyObject) {
- super(receiver, name, true, irubyObject);
- }
- void markInitialized() {
- this.initialized = true;
- }
- /**
- * Retrieves constants from Ruby after the evaluation or method invocation.
- *
- * @param runtime Ruby runtime
- * @param receiver receiver object returned when a script is evaluated.
- * @param vars map to save retrieved constants.
- */
- public static void retrieve(RubyObject receiver, BiVariableMap vars) {
- if (vars.isLazy()) return;
- // user defined constants of top level go to a super class
- updateConstantsOfSuperClass(receiver, vars);
- // Constants might have the same names but different receivers.
- updateConstants(receiver, vars);
- RubyObject topSelf = (RubyObject)receiver.getRuntime().getTopSelf();
- updateConstants(topSelf, vars);
- }
- /*
- private static void updateARGV(IRubyObject receiver, BiVariableMap vars) {
- String name = "ARGV".intern();
- IRubyObject argv = receiver.getRuntime().getTopSelf().getMetaClass().fastGetConstant(name);
- if (argv == null || (argv instanceof RubyNil)) return;
- BiVariable var; // This var is for ARGV.
- // ARGV constant should be only one
- if (vars.containsKey((Object)name)) {
- var = vars.getVariable((RubyObject)receiver.getRuntime().getTopSelf(), name);
- var.setRubyObject(argv);
- } else {
- var = new Constant(receiver.getRuntime().getTopSelf(), name, argv);
- ((Constant) var).markInitialized();
- vars.update(name, var);
- }
- }*/
- private static void updateConstantsOfSuperClass(RubyObject receiver, BiVariableMap vars) {
- // Super class has many many constants, so this method updates only
- // constans in BiVariableMap.
- Map<String, RubyModule.ConstantEntry> map =
- receiver.getRuntime().getTopSelf().getMetaClass().getSuperClass().getConstantMap();
- List<BiVariable> variables = vars.getVariables();
- // Need to check that this constant has been stored in BiVariableMap.
- for (BiVariable variable : variables) {
- if (variable.getType() == Type.Constant) {
- if (map.containsKey(variable.getName())) {
- IRubyObject value = map.get(variable.getName()).value;
- variable.setRubyObject(value);
- }
- }
- }
- }
- private static void updateConstants(RubyObject receiver, BiVariableMap vars) {
- Collection<String> names = receiver.getMetaClass().getConstantNames();
- for (String name : names) {
- IRubyObject value = receiver.getMetaClass().getConstant(name);
- BiVariable var = null;
- List<String> savedNames = vars.getNames();
- // Need to check that this constant has been stored in BiVariableMap.
- for (int i=0; i<savedNames.size(); i++) {
- if (name.equals(savedNames.get(i))) {
- var = (BiVariable) vars.getVariables().get(i);
- if (receiver == var.getReceiver()) {
- var.setRubyObject(value);
- } else {
- var = null;
- }
- }
- }
- if (var == null) {
- var = new Constant(receiver, name, value);
- ((Constant) var).markInitialized();
- vars.update(name, var);
- }
- }
- }
- /**
- * Retrieves a constant by key from Ruby runtime after the evaluation.
- * This method is used when eager retrieval is off.
- *
- * @param receiver receiver object returned when a script is evaluated.
- * @param vars map to save retrieved instance variables.
- * @param key instace varible name
- */
- public static void retrieveByKey(RubyObject receiver, BiVariableMap vars, String key) {
- // if the specified key doesn't exist, this method is called before the
- // evaluation. Don't update value in this case.
- IRubyObject value = null;
- if (receiver.getMetaClass().getConstantNames().contains(key)) {
- value = receiver.getMetaClass().getConstant(key);
- } else if (receiver.getRuntime().getTopSelf().getMetaClass().getConstantNames().contains(key)) {
- value = receiver.getRuntime().getTopSelf().getMetaClass().getConstant(key);
- } else if (receiver.getRuntime().getTopSelf().getMetaClass().getSuperClass().getConstantNames().contains(key)) {
- value = receiver.getRuntime().getTopSelf().getMetaClass().getSuperClass().getConstant(key);
- }
- if (value == null) return;
- // the specified key is found, so let's update
- BiVariable var = vars.getVariable(receiver, key);
- if (var != null) {
- var.setRubyObject(value);
- } else {
- var = new Constant(receiver, key, value);
- vars.update(key, var);
- }
- }
- /**
- * Returns enum type of this variable defined in {@link BiVariable}.
- *
- * @return this enum type, BiVariable.Type.Constant.
- */
- public Type getType() {
- return Type.Constant;
- }
- /**
- * Returns true if the given name is a decent Ruby constant. Unless
- * returns false.
- *
- * @param name is a name to be checked.
- * @return true if the given name is of a Ruby constant.
- */
- public static boolean isValidName(Object name) {
- return isValidName(pattern, name);
- }
- /**
- * Injects a constant value to a parsed Ruby script. This method is
- * invoked during EvalUnit#run() is executed.
- */
- public void inject() {
- if (receiver == receiver.getRuntime().getTopSelf()) {
- RubyModule rubyModule = getRubyClass(receiver.getRuntime());
- if (rubyModule == null) rubyModule = receiver.getRuntime().getCurrentContext().getRubyClass();
- if (rubyModule == null) return;
- rubyModule.storeConstant(name, irubyObject);
- } else {
- receiver.getMetaClass().storeConstant(name, irubyObject);
- }
- receiver.getRuntime().getConstantInvalidator().invalidate();
- initialized = true;
- }
- /**
- * Attempts to remove this constant from top self or receiver.
- *
- */
- public void remove() {
- IRubyObject rubyName = JavaUtil.convertJavaToRuby(receiver.getRuntime(), name);
- if (receiver.getMetaClass().getConstantNames().contains(name)) {
- receiver.getMetaClass().remove_const(receiver.getRuntime().getCurrentContext(), rubyName);
- } else if (receiver.getRuntime().getTopSelf().getMetaClass().getConstantNames().contains(name)) {
- receiver.getRuntime().getTopSelf().getMetaClass().remove_const(receiver.getRuntime().getCurrentContext(), rubyName);
- } else if (receiver.getRuntime().getTopSelf().getMetaClass().getSuperClass().getConstantNames().contains(name)) {
- receiver.getRuntime().getTopSelf().getMetaClass().getSuperClass().remove_const(receiver.getRuntime().getCurrentContext(), rubyName);
- }
- }
- }