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From s...@apache.org
Subject svn commit: r799492 - in /commons/proper/jexl/branches/2.0/src: java/org/apache/commons/jexl/scripting/JexlScriptEngine.java test/org/apache/commons/jexl/scripting/JexlScriptEngineTest.java
Date Fri, 31 Jul 2009 02:24:07 GMT
Author: sebb
Date: Fri Jul 31 02:24:07 2009
New Revision: 799492

URL: http://svn.apache.org/viewvc?rev=799492&view=rev
Log:
Initial implementation of Jexl Script engine and simple unit test

Added:
    commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/scripting/JexlScriptEngine.java
  (with props)
    commons/proper/jexl/branches/2.0/src/test/org/apache/commons/jexl/scripting/JexlScriptEngineTest.java
  (with props)

Added: commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/scripting/JexlScriptEngine.java
URL: http://svn.apache.org/viewvc/commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/scripting/JexlScriptEngine.java?rev=799492&view=auto
==============================================================================
--- commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/scripting/JexlScriptEngine.java
(added)
+++ commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/scripting/JexlScriptEngine.java
Fri Jul 31 02:24:07 2009
@@ -0,0 +1,202 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ */
+
+package org.apache.commons.jexl.scripting;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+
+import javax.script.AbstractScriptEngine;
+import javax.script.Bindings;
+import javax.script.ScriptContext;
+import javax.script.ScriptEngineFactory;
+import javax.script.ScriptException;
+import javax.script.SimpleBindings;
+
+import org.apache.commons.jexl.JexlContext;
+import org.apache.commons.jexl.JexlEngine;
+import org.apache.commons.jexl.Script;
+
+// Note: this is a generated class, so won't be present until JavaCC has been run
+import org.apache.commons.jexl.parser.ParseException;
+
+/**
+ * Implements the Jexl ScriptEngine for JSF-223.
+ * <p>
+ * See
+ * <a href="http://java.sun.com/javase/6/docs/api/javax/script/package-summary.html">Java
Scripting API</a>
+ * Javadoc.
+ */
+public class JexlScriptEngine extends AbstractScriptEngine {
+
+    private final ScriptEngineFactory factory;
+    
+    private final JexlEngine engine;
+    
+    public JexlScriptEngine() {
+        this(null);
+    }
+
+    public JexlScriptEngine(final ScriptEngineFactory _factory) {
+        factory = _factory;
+        engine = new JexlEngine();
+    }
+
+    /** {@inheritDoc} */
+    public Bindings createBindings() {
+        return new SimpleBindings();
+    }
+
+    /** {@inheritDoc} */
+    public Object eval(Reader script, ScriptContext context) throws ScriptException {
+        BufferedReader reader = new BufferedReader(script);
+        StringBuilder buffer = new StringBuilder();
+        try {
+            String line;
+            try {
+                while ((line = reader.readLine()) != null) {
+                    buffer.append(line).append('\n');
+                }
+            } catch (IOException e) {
+                throw new ScriptException(e);
+            }
+        } finally {
+            try {
+                reader.close();
+            } catch (IOException e) {
+            }
+        }
+        return eval(buffer.toString(), context);
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("unchecked")
+    public Object eval(String scriptText, final ScriptContext context) throws ScriptException
{
+        if (scriptText == null) {
+            return null;
+        }
+        context.setAttribute("context", context, ScriptContext.ENGINE_SCOPE);
+        try {
+            Script script = engine.createScript(scriptText);
+            JexlContext ctxt = new JexlContext(){
+                public void setVars(Map vars) {
+                    context.setBindings(new SimpleBindings(vars), ScriptContext.ENGINE_SCOPE);
+                }
+
+                public Map getVars() {
+                    return new JexlContextWrapper(context);
+                }
+            };
+
+            ctxt.getVars().put("context", "value");
+
+            return script.execute(ctxt);
+        } catch (ParseException e) {
+            e.printStackTrace();
+            throw new ScriptException(e);
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new ScriptException(e.toString());
+        }
+    }
+
+    /** {@inheritDoc} */
+    public ScriptEngineFactory getFactory() {
+        return factory == null ? new JexlScriptEngineFactory() : factory;
+    }
+
+    /**
+     * Wrapper to convert a JSR-223 ScriptContext into a JexlContext.
+     * 
+     * Current implementation only gives access to ENGINE_SCOPE binding.
+     */
+    @SuppressWarnings("unchecked")
+    private static class JexlContextWrapper implements Map {
+        
+        private final ScriptContext context;
+
+        private JexlContextWrapper (final ScriptContext _context){
+            context = _context;
+        }
+
+        public void clear() {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            bnd.clear();
+        }
+
+        public boolean containsKey(final Object key) {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.containsKey(key);
+        }
+
+        public boolean containsValue(final Object value) {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.containsValue(value);
+        }
+
+        public Set entrySet() {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.entrySet();
+        }
+
+        public Object get(final Object key) {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.get(key);
+        }
+
+        public boolean isEmpty() {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.isEmpty();
+        }
+
+        public Set keySet() {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.keySet();
+        }
+
+        public Object put(final Object key, final Object value) {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.put(key, value);
+        }
+
+        public void putAll(Map t) {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            bnd.putAll(t); // N.B. SimpleBindings checks for valid keys
+        }
+
+        public Object remove(Object key) {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.remove(key);
+        }
+
+        public int size() {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.size();
+        }
+
+        public Collection values() {
+            Bindings bnd = context.getBindings(ScriptContext.ENGINE_SCOPE);
+            return bnd.values();
+        }
+
+    }
+}

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Propchange: commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/scripting/JexlScriptEngine.java
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Added: commons/proper/jexl/branches/2.0/src/test/org/apache/commons/jexl/scripting/JexlScriptEngineTest.java
URL: http://svn.apache.org/viewvc/commons/proper/jexl/branches/2.0/src/test/org/apache/commons/jexl/scripting/JexlScriptEngineTest.java?rev=799492&view=auto
==============================================================================
--- commons/proper/jexl/branches/2.0/src/test/org/apache/commons/jexl/scripting/JexlScriptEngineTest.java
(added)
+++ commons/proper/jexl/branches/2.0/src/test/org/apache/commons/jexl/scripting/JexlScriptEngineTest.java
Fri Jul 31 02:24:07 2009
@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ */
+
+package org.apache.commons.jexl.scripting;
+
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+
+import junit.framework.TestCase;
+
+public class JexlScriptEngineTest extends TestCase {
+    
+    public void testScripting() throws Exception {
+        ScriptEngineManager manager = new ScriptEngineManager();
+        assertNotNull("Manager should not be null", manager);
+        ScriptEngine engine = manager.getEngineByName("jexl");
+        assertNotNull("Engine should not be null (name)", engine);
+        engine = manager.getEngineByExtension("jexl");
+        assertNotNull("Engine should not be null (ext)", engine);
+        final Integer initialValue = Integer.valueOf(123);
+        assertEquals(initialValue,engine.eval("123"));
+        assertEquals(initialValue,engine.eval("0;123"));// multiple statements
+        long time1 = System.currentTimeMillis();
+        Long time2 = (Long) engine.eval("" +
+        		"sys=context.class.forName(\"java.lang.System\");"
+        		+"now=sys.currentTimeMillis();"
+        		);
+        assertTrue("Must take some time to process this",time1 <= time2.longValue());
+        engine.put("value", initialValue);
+        assertEquals(initialValue,engine.get("value"));
+        final Long newValue = Long.valueOf(124);
+        assertEquals(newValue,engine.eval("old=value;value=value+1"));
+        assertEquals(initialValue,engine.get("old"));
+        assertEquals(newValue,engine.get("value"));
+    }
+
+}

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