--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.scripting/share/classes/javax/script/SimpleScriptContext.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,334 @@
+/*
+ * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package javax.script;
+
+import java.util.*;
+import java.io.*;
+
+/**
+ * Simple implementation of ScriptContext.
+ *
+ * @author Mike Grogan
+ * @since 1.6
+ */
+public class SimpleScriptContext implements ScriptContext {
+
+ /**
+ * This is the writer to be used to output from scripts.
+ * By default, a <code>PrintWriter</code> based on <code>System.out</code>
+ * is used. Accessor methods getWriter, setWriter are used to manage
+ * this field.
+ * @see java.lang.System#out
+ * @see java.io.PrintWriter
+ */
+ protected Writer writer;
+
+ /**
+ * This is the writer to be used to output errors from scripts.
+ * By default, a <code>PrintWriter</code> based on <code>System.err</code> is
+ * used. Accessor methods getErrorWriter, setErrorWriter are used to manage
+ * this field.
+ * @see java.lang.System#err
+ * @see java.io.PrintWriter
+ */
+ protected Writer errorWriter;
+
+ /**
+ * This is the reader to be used for input from scripts.
+ * By default, a <code>InputStreamReader</code> based on <code>System.in</code>
+ * is used and default charset is used by this reader. Accessor methods
+ * getReader, setReader are used to manage this field.
+ * @see java.lang.System#in
+ * @see java.io.InputStreamReader
+ */
+ protected Reader reader;
+
+
+ /**
+ * This is the engine scope bindings.
+ * By default, a <code>SimpleBindings</code> is used. Accessor
+ * methods setBindings, getBindings are used to manage this field.
+ * @see SimpleBindings
+ */
+ protected Bindings engineScope;
+
+ /**
+ * This is the global scope bindings.
+ * By default, a null value (which means no global scope) is used. Accessor
+ * methods setBindings, getBindings are used to manage this field.
+ */
+ protected Bindings globalScope;
+
+ /**
+ * Create a {@code SimpleScriptContext}.
+ */
+ public SimpleScriptContext() {
+ engineScope = new SimpleBindings();
+ globalScope = null;
+ reader = new InputStreamReader(System.in);
+ writer = new PrintWriter(System.out , true);
+ errorWriter = new PrintWriter(System.err, true);
+ }
+
+ /**
+ * Sets a <code>Bindings</code> of attributes for the given scope. If the value
+ * of scope is <code>ENGINE_SCOPE</code> the given <code>Bindings</code> replaces the
+ * <code>engineScope</code> field. If the value
+ * of scope is <code>GLOBAL_SCOPE</code> the given <code>Bindings</code> replaces the
+ * <code>globalScope</code> field.
+ *
+ * @param bindings The <code>Bindings</code> of attributes to set.
+ * @param scope The value of the scope in which the attributes are set.
+ *
+ * @throws IllegalArgumentException if scope is invalid.
+ * @throws NullPointerException if the value of scope is <code>ENGINE_SCOPE</code> and
+ * the specified <code>Bindings</code> is null.
+ */
+ public void setBindings(Bindings bindings, int scope) {
+
+ switch (scope) {
+
+ case ENGINE_SCOPE:
+ if (bindings == null) {
+ throw new NullPointerException("Engine scope cannot be null.");
+ }
+ engineScope = bindings;
+ break;
+ case GLOBAL_SCOPE:
+ globalScope = bindings;
+ break;
+ default:
+ throw new IllegalArgumentException("Invalid scope value.");
+ }
+ }
+
+
+ /**
+ * Retrieves the value of the attribute with the given name in
+ * the scope occurring earliest in the search order. The order
+ * is determined by the numeric value of the scope parameter (lowest
+ * scope values first.)
+ *
+ * @param name The name of the attribute to retrieve.
+ * @return The value of the attribute in the lowest scope for
+ * which an attribute with the given name is defined. Returns
+ * null if no attribute with the name exists in any scope.
+ * @throws NullPointerException if the name is null.
+ * @throws IllegalArgumentException if the name is empty.
+ */
+ public Object getAttribute(String name) {
+ checkName(name);
+ if (engineScope.containsKey(name)) {
+ return getAttribute(name, ENGINE_SCOPE);
+ } else if (globalScope != null && globalScope.containsKey(name)) {
+ return getAttribute(name, GLOBAL_SCOPE);
+ }
+
+ return null;
+ }
+
+ /**
+ * Gets the value of an attribute in a given scope.
+ *
+ * @param name The name of the attribute to retrieve.
+ * @param scope The scope in which to retrieve the attribute.
+ * @return The value of the attribute. Returns <code>null</code> is the name
+ * does not exist in the given scope.
+ *
+ * @throws IllegalArgumentException
+ * if the name is empty or if the value of scope is invalid.
+ * @throws NullPointerException if the name is null.
+ */
+ public Object getAttribute(String name, int scope) {
+ checkName(name);
+ switch (scope) {
+
+ case ENGINE_SCOPE:
+ return engineScope.get(name);
+
+ case GLOBAL_SCOPE:
+ if (globalScope != null) {
+ return globalScope.get(name);
+ }
+ return null;
+
+ default:
+ throw new IllegalArgumentException("Illegal scope value.");
+ }
+ }
+
+ /**
+ * Remove an attribute in a given scope.
+ *
+ * @param name The name of the attribute to remove
+ * @param scope The scope in which to remove the attribute
+ *
+ * @return The removed value.
+ * @throws IllegalArgumentException
+ * if the name is empty or if the scope is invalid.
+ * @throws NullPointerException if the name is null.
+ */
+ public Object removeAttribute(String name, int scope) {
+ checkName(name);
+ switch (scope) {
+
+ case ENGINE_SCOPE:
+ if (getBindings(ENGINE_SCOPE) != null) {
+ return getBindings(ENGINE_SCOPE).remove(name);
+ }
+ return null;
+
+ case GLOBAL_SCOPE:
+ if (getBindings(GLOBAL_SCOPE) != null) {
+ return getBindings(GLOBAL_SCOPE).remove(name);
+ }
+ return null;
+
+ default:
+ throw new IllegalArgumentException("Illegal scope value.");
+ }
+ }
+
+ /**
+ * Sets the value of an attribute in a given scope. If the scope is <code>GLOBAL_SCOPE</code>
+ * and no Bindings is set for <code>GLOBAL_SCOPE</code>, then setAttribute call is a no-op.
+ *
+ * @param name The name of the attribute to set
+ * @param value The value of the attribute
+ * @param scope The scope in which to set the attribute
+ *
+ * @throws IllegalArgumentException
+ * if the name is empty or if the scope is invalid.
+ * @throws NullPointerException if the name is null.
+ */
+ public void setAttribute(String name, Object value, int scope) {
+ checkName(name);
+ switch (scope) {
+
+ case ENGINE_SCOPE:
+ engineScope.put(name, value);
+ return;
+
+ case GLOBAL_SCOPE:
+ if (globalScope != null) {
+ globalScope.put(name, value);
+ }
+ return;
+
+ default:
+ throw new IllegalArgumentException("Illegal scope value.");
+ }
+ }
+
+ /** {@inheritDoc} */
+ public Writer getWriter() {
+ return writer;
+ }
+
+ /** {@inheritDoc} */
+ public Reader getReader() {
+ return reader;
+ }
+
+ /** {@inheritDoc} */
+ public void setReader(Reader reader) {
+ this.reader = reader;
+ }
+
+ /** {@inheritDoc} */
+ public void setWriter(Writer writer) {
+ this.writer = writer;
+ }
+
+ /** {@inheritDoc} */
+ public Writer getErrorWriter() {
+ return errorWriter;
+ }
+
+ /** {@inheritDoc} */
+ public void setErrorWriter(Writer writer) {
+ this.errorWriter = writer;
+ }
+
+ /**
+ * Get the lowest scope in which an attribute is defined.
+ * @param name Name of the attribute
+ * .
+ * @return The lowest scope. Returns -1 if no attribute with the given
+ * name is defined in any scope.
+ * @throws NullPointerException if name is null.
+ * @throws IllegalArgumentException if name is empty.
+ */
+ public int getAttributesScope(String name) {
+ checkName(name);
+ if (engineScope.containsKey(name)) {
+ return ENGINE_SCOPE;
+ } else if (globalScope != null && globalScope.containsKey(name)) {
+ return GLOBAL_SCOPE;
+ } else {
+ return -1;
+ }
+ }
+
+ /**
+ * Returns the value of the <code>engineScope</code> field if specified scope is
+ * <code>ENGINE_SCOPE</code>. Returns the value of the <code>globalScope</code> field if the specified scope is
+ * <code>GLOBAL_SCOPE</code>.
+ *
+ * @param scope The specified scope
+ * @return The value of either the <code>engineScope</code> or <code>globalScope</code> field.
+ * @throws IllegalArgumentException if the value of scope is invalid.
+ */
+ public Bindings getBindings(int scope) {
+ if (scope == ENGINE_SCOPE) {
+ return engineScope;
+ } else if (scope == GLOBAL_SCOPE) {
+ return globalScope;
+ } else {
+ throw new IllegalArgumentException("Illegal scope value.");
+ }
+ }
+
+ /** {@inheritDoc} */
+ public List<Integer> getScopes() {
+ return scopes;
+ }
+
+ private void checkName(String name) {
+ Objects.requireNonNull(name);
+ if (name.isEmpty()) {
+ throw new IllegalArgumentException("name cannot be empty");
+ }
+ }
+
+ private static List<Integer> scopes;
+ static {
+ scopes = new ArrayList<Integer>(2);
+ scopes.add(ENGINE_SCOPE);
+ scopes.add(GLOBAL_SCOPE);
+ scopes = Collections.unmodifiableList(scopes);
+ }
+}