src/script/GenericScriptFactory.java

package script;

import java.io.IOException;

import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.scripting.ScriptCompilationException;
import org.springframework.scripting.ScriptFactory;
import org.springframework.scripting.ScriptSource;
import org.springframework.util.Assert;

/**
 * Base class for script factories.
 * 
 * @author jason
 */
public abstract class GenericScriptFactory implements ScriptFactory, BeanClassLoaderAware {

    private final String scriptSourceLocator;
    
    private Object scriptResult;
    private String beanName;
    private Class[] returnType = null;

    private final Object scriptClassMonitor = new Object();

    public GenericScriptFactory(String scriptSourceLocator, String beanName, Class returnType) {
        Assert.hasText(scriptSourceLocator, "'scriptSourceLocator' must not be empty");
        Assert.hasText(beanName, "'beanName' must not be empty");
        
        this.scriptSourceLocator = scriptSourceLocator;
        this.beanName = beanName;
        if (returnType != null) {
            this.returnType = new Class[]{ returnType };
        }
    }

    public void setBeanClassLoader(ClassLoader classLoader) {
    }

    public String getScriptSourceLocator() {
        return this.scriptSourceLocator;
    }

    public Class[] getScriptInterfaces() {
        return returnType;
    }

    public boolean requiresConfigInterface() {
        return false;
    }

    public Class getScriptedObjectType(ScriptSource scriptSource) throws IOException, ScriptCompilationException {
        synchronized (this.scriptClassMonitor) {
            if (this.scriptResult == null || scriptSource.isModified()) {
                return null;
            }
            return this.scriptResult.getClass();
        }
    }
    
    protected Object getScriptResult() {
        return scriptResult;
    }
    
    protected void setScriptResult(Object scriptResult) {
        this.scriptResult = scriptResult;
    }
    
    protected String getBeanName() {
        return beanName;
    }
    
    protected Object getScriptClassMonitor() {
        return scriptClassMonitor;
    }
    
    public abstract Object getScriptedObject(ScriptSource scriptSource, Class[] actualInterfaces) throws IOException, ScriptCompilationException;
}