/*
* Copyright 2003-2010 the original author or authors.
*
* Licensed 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.codehaus.groovy.vmplugin.v6;
import groovy.lang.Binding;
import org.codehaus.groovy.runtime.DefaultGroovyMethodsSupport;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
import java.io.Reader;
import java.util.Map;
import java.util.Set;
/**
* This class defines new Java 6 specific groovy methods which extend the normal
* JDK classes inside the Groovy environment. Static methods are used with the
* first parameter the destination class.
*/
public class PluginDefaultGroovyMethods extends DefaultGroovyMethodsSupport {
/**
* Executes the specified script. The default <code>ScriptContext</code> for the <code>ScriptEngine</code>
* is used. Variables from a Groovy <code>Binding</code> are made available in the default scope of the
* <code>Bindings</code> of the <code>ScriptEngine</code>. Resulting variables in the <code>Bindings</code>
* are returned back to the Groovy <code>Binding</code>.
*
* @param self A ScriptEngine
* @param script The script language source to be executed
* @param binding A Groovy binding
* @return The value returned from the execution of the script (if supported by the Script engine)
* @throws javax.script.ScriptException if error occurs in script
* @throws NullPointerException if the argument is null
* @see #eval(javax.script.ScriptEngine, java.io.Reader, groovy.lang.Binding)
* @since 1.7.3
*/
public static Object eval(ScriptEngine self, String script, Binding binding) throws ScriptException {
storeBindingVars(self, binding);
Object result = self.eval(script);
retrieveBindingVars(self, binding);
return result;
}
/**
* Same as <code>eval(ScriptEngine, Reader, Binding)</code> except that the
* source of the script is provided as a <code>Reader</code>
*
* @param self A ScriptEngine
* @param reader The source of the script
* @param binding A Groovy binding
* @return The value returned by the script
* @throws javax.script.ScriptException if an error occurs in script
* @throws NullPointerException if the argument is null
* @see #eval(javax.script.ScriptEngine, java.lang.String, groovy.lang.Binding)
* @since 1.7.3
*/
public static Object eval(ScriptEngine self, Reader reader, Binding binding) throws ScriptException {
storeBindingVars(self, binding);
Object result = self.eval(reader);
retrieveBindingVars(self, binding);
return result;
}
private static void retrieveBindingVars(ScriptEngine self, Binding binding) {
Set<Map.Entry<String, Object>> returnVars = self.getBindings(ScriptContext.ENGINE_SCOPE).entrySet();
for (Map.Entry<String, Object> me : returnVars) {
binding.setVariable(me.getKey(), me.getValue());
}
}
@SuppressWarnings("unchecked")
private static void storeBindingVars(ScriptEngine self, Binding binding) {
Set<Map.Entry> vars = binding.getVariables().entrySet();
for (Map.Entry me : vars) {
self.put(me.getKey().toString(), me.getValue());
}
}
}