/*
* Copyright 2002-2008 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.springframework.scripting;
import java.io.IOException;
/**
* Script definition interface, encapsulating the configuration
* of a specific script as well as a factory method for
* creating the actual scripted Java <code>Object</code>.
*
* @author Juergen Hoeller
* @author Rob Harrop
* @since 2.0
* @see #getScriptSourceLocator
* @see #getScriptedObject
*/
public interface ScriptFactory {
/**
* Return a locator that points to the source of the script.
* Interpreted by the post-processor that actually creates the script.
* <p>Typical supported locators are Spring resource locations
* (such as "file:C:/myScript.bsh" or "classpath:myPackage/myScript.bsh")
* and inline scripts ("inline:myScriptText...").
* @return the script source locator
* @see org.springframework.scripting.support.ScriptFactoryPostProcessor#convertToScriptSource
* @see org.springframework.core.io.ResourceLoader
*/
String getScriptSourceLocator();
/**
* Return the business interfaces that the script is supposed to implement.
* <p>Can return <code>null</code> if the script itself determines
* its Java interfaces (such as in the case of Groovy).
* @return the interfaces for the script
*/
Class[] getScriptInterfaces();
/**
* Return whether the script requires a config interface to be
* generated for it. This is typically the case for scripts that
* do not determine Java signatures themselves, with no appropriate
* config interface specified in <code>getScriptInterfaces()</code>.
* @return whether the script requires a generated config interface
* @see #getScriptInterfaces()
*/
boolean requiresConfigInterface();
/**
* Factory method for creating the scripted Java object.
* <p>Implementations are encouraged to cache script metadata such as
* a generated script class. Note that this method may be invoked
* concurrently and must be implemented in a thread-safe fashion.
* @param scriptSource the actual ScriptSource to retrieve
* the script source text from (never <code>null</code>)
* @param actualInterfaces the actual interfaces to expose,
* including script interfaces as well as a generated config interface
* (if applicable; may be <code>null</code>)
* @return the scripted Java object
* @throws IOException if script retrieval failed
* @throws ScriptCompilationException if script compilation failed
*/
Object getScriptedObject(ScriptSource scriptSource, Class[] actualInterfaces)
throws IOException, ScriptCompilationException;
/**
* Determine the type of the scripted Java object.
* <p>Implementations are encouraged to cache script metadata such as
* a generated script class. Note that this method may be invoked
* concurrently and must be implemented in a thread-safe fashion.
* @param scriptSource the actual ScriptSource to retrieve
* the script source text from (never <code>null</code>)
* @return the type of the scripted Java object, or <code>null</code>
* if none could be determined
* @throws IOException if script retrieval failed
* @throws ScriptCompilationException if script compilation failed
* @since 2.0.3
*/
Class getScriptedObjectType(ScriptSource scriptSource)
throws IOException, ScriptCompilationException;
/**
* Determine whether a refresh is required (e.g. through
* ScriptSource's <code>isModified()</code> method).
* @param scriptSource the actual ScriptSource to retrieve
* the script source text from (never <code>null</code>)
* @return whether a fresh {@link #getScriptedObject} call is required
* @since 2.5.2
* @see ScriptSource#isModified()
*/
boolean requiresScriptedObjectRefresh(ScriptSource scriptSource);
}
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