8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javax.script;
27 import java.util.*;
28 import java.net.URL;
29 import java.io.*;
30 import java.security.*;
31 import sun.misc.Service;
32 import sun.misc.ServiceConfigurationError;
33 import sun.reflect.Reflection;
34 import sun.security.util.SecurityConstants;
35
36 /**
37 * The <code>ScriptEngineManager</code> implements a discovery and instantiation
38 * mechanism for <code>ScriptEngine</code> classes and also maintains a
39 * collection of key/value pairs storing state shared by all engines created
40 * by the Manager. This class uses the <a href="../../../technotes/guides/jar/jar.html#Service%20Provider">service provider</a> mechanism to enumerate all the
41 * implementations of <code>ScriptEngineFactory</code>. <br><br>
42 * The <code>ScriptEngineManager</code> provides a method to return an array of all these factories
43 * as well as utility methods which look up factories on the basis of language name, file extension
44 * and mime type.
45 * <p>
46 * The <code>Bindings</code> of key/value pairs, referred to as the "Global Scope" maintained
47 * by the manager is available to all instances of <code>ScriptEngine</code> created
48 * by the <code>ScriptEngineManager</code>. The values in the <code>Bindings</code> are
49 * generally exposed in all scripts.
50 *
51 * @author Mike Grogan
52 * @author A. Sundararajan
87 init(loader);
88 }
89
90 private void init(final ClassLoader loader) {
91 globalScope = new SimpleBindings();
92 engineSpis = new HashSet<ScriptEngineFactory>();
93 nameAssociations = new HashMap<String, ScriptEngineFactory>();
94 extensionAssociations = new HashMap<String, ScriptEngineFactory>();
95 mimeTypeAssociations = new HashMap<String, ScriptEngineFactory>();
96 AccessController.doPrivileged(new PrivilegedAction<Object>() {
97 public Object run() {
98 initEngines(loader);
99 return null;
100 }
101 });
102 }
103
104 private void initEngines(final ClassLoader loader) {
105 Iterator<ScriptEngineFactory> itr = null;
106 try {
107 if (loader != null) {
108 itr = Service.providers(ScriptEngineFactory.class, loader);
109 } else {
110 itr = Service.installedProviders(ScriptEngineFactory.class);
111 }
112 } catch (ServiceConfigurationError err) {
113 System.err.println("Can't find ScriptEngineFactory providers: " +
114 err.getMessage());
115 if (DEBUG) {
116 err.printStackTrace();
117 }
118 // do not throw any exception here. user may want to
119 // manage his/her own factories using this manager
120 // by explicit registratation (by registerXXX) methods.
121 return;
122 }
123
124 try {
125 while (itr.hasNext()) {
126 try {
127 ScriptEngineFactory fact = itr.next();
128 engineSpis.add(fact);
129 } catch (ServiceConfigurationError err) {
130 System.err.println("ScriptEngineManager providers.next(): "
131 + err.getMessage());
|
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javax.script;
27 import java.util.*;
28 import java.security.*;
29 import java.util.ServiceLoader;
30 import java.util.ServiceConfigurationError;
31 import sun.reflect.Reflection;
32 import sun.security.util.SecurityConstants;
33
34 /**
35 * The <code>ScriptEngineManager</code> implements a discovery and instantiation
36 * mechanism for <code>ScriptEngine</code> classes and also maintains a
37 * collection of key/value pairs storing state shared by all engines created
38 * by the Manager. This class uses the <a href="../../../technotes/guides/jar/jar.html#Service%20Provider">service provider</a> mechanism to enumerate all the
39 * implementations of <code>ScriptEngineFactory</code>. <br><br>
40 * The <code>ScriptEngineManager</code> provides a method to return an array of all these factories
41 * as well as utility methods which look up factories on the basis of language name, file extension
42 * and mime type.
43 * <p>
44 * The <code>Bindings</code> of key/value pairs, referred to as the "Global Scope" maintained
45 * by the manager is available to all instances of <code>ScriptEngine</code> created
46 * by the <code>ScriptEngineManager</code>. The values in the <code>Bindings</code> are
47 * generally exposed in all scripts.
48 *
49 * @author Mike Grogan
50 * @author A. Sundararajan
85 init(loader);
86 }
87
88 private void init(final ClassLoader loader) {
89 globalScope = new SimpleBindings();
90 engineSpis = new HashSet<ScriptEngineFactory>();
91 nameAssociations = new HashMap<String, ScriptEngineFactory>();
92 extensionAssociations = new HashMap<String, ScriptEngineFactory>();
93 mimeTypeAssociations = new HashMap<String, ScriptEngineFactory>();
94 AccessController.doPrivileged(new PrivilegedAction<Object>() {
95 public Object run() {
96 initEngines(loader);
97 return null;
98 }
99 });
100 }
101
102 private void initEngines(final ClassLoader loader) {
103 Iterator<ScriptEngineFactory> itr = null;
104 try {
105 ServiceLoader<ScriptEngineFactory> sl;
106 if (loader != null) {
107 sl = ServiceLoader.load(ScriptEngineFactory.class, loader);
108 } else {
109 sl = ServiceLoader.loadInstalled(ScriptEngineFactory.class);
110 }
111 itr = sl.iterator();
112 } catch (ServiceConfigurationError err) {
113 System.err.println("Can't find ScriptEngineFactory providers: " +
114 err.getMessage());
115 if (DEBUG) {
116 err.printStackTrace();
117 }
118 // do not throw any exception here. user may want to
119 // manage his/her own factories using this manager
120 // by explicit registratation (by registerXXX) methods.
121 return;
122 }
123
124 try {
125 while (itr.hasNext()) {
126 try {
127 ScriptEngineFactory fact = itr.next();
128 engineSpis.add(fact);
129 } catch (ServiceConfigurationError err) {
130 System.err.println("ScriptEngineManager providers.next(): "
131 + err.getMessage());
|