Moving to root below branch label

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2005 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/template/TemplateServiceImpl.java

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+/*
+ * Copyright (C) 2005 Alfresco, Inc.
+ *
+ * Licensed under the Mozilla Public License version 1.1 
+ * with a permitted attribution clause. You may obtain a
+ * copy of the License at
+ *
+ *   http://www.alfresco.org/legal/license.txt
+ *
+ * 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.alfresco.repo.template;
+
+import java.io.StringWriter;
+import java.io.Writer;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.alfresco.error.AlfrescoRuntimeException;
+import org.alfresco.service.cmr.repository.TemplateException;
+import org.alfresco.service.cmr.repository.TemplateProcessor;
+import org.alfresco.service.cmr.repository.TemplateService;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.beans.BeansException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+
+/**
+ * @author Kevin Roast
+ */
+public class TemplateServiceImpl implements TemplateService, ApplicationContextAware
+{
+    private static Log logger = LogFactory.getLog(TemplateService.class);
+    
+    /** Spring ApplicationContext for bean lookup by ID */
+    private ApplicationContext applicationContext;
+    
+    /** Default Template processor engine to use */
+    private String defaultTemplateEngine;
+    
+    /** Available template engine names to impl class names */
+    private Map<String, String> templateEngines;
+    
+    /** Threadlocal instance for template processor cache */
+    private static ThreadLocal<Map<String, TemplateProcessor>> processors = new ThreadLocal();
+    
+    /**
+     * Set the application context
+     * 
+     * @param applicationContext    the application context
+     */
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException
+    {
+        this.applicationContext = applicationContext;
+    }
+    
+    /**
+     * @param defaultTemplateEngine The default Template Engine name to set.
+     */
+    public void setDefaultTemplateEngine(String defaultTemplateEngine)
+    {
+        this.defaultTemplateEngine = defaultTemplateEngine;
+    }
+
+    /**
+     * @param templateEngines       The Map of template engine name to impl class name to set.
+     */
+    public void setTemplateEngines(Map<String, String> templateEngines)
+    {
+        this.templateEngines = templateEngines;
+    }
+
+    /**
+     * @see org.alfresco.service.cmr.repository.TemplateService#getTemplateProcessor(java.lang.String)
+     */
+    public TemplateProcessor getTemplateProcessor(String engine)
+    {
+        try
+        {
+            return getTemplateProcessorImpl(engine);
+        }
+        catch (Throwable err)
+        {
+            if (logger.isDebugEnabled())
+                logger.debug("Unable to load template processor.", err);
+            
+            return null;
+        }
+    }
+
+    /**
+     * @see org.alfresco.service.cmr.repository.TemplateService#processTemplate(java.lang.String, java.lang.String, java.lang.Object, java.io.Writer)
+     */
+    public void processTemplate(String engine, String template, Object model, Writer out)
+        throws TemplateException
+    {
+        try
+        {
+           // execute template processor
+           TemplateProcessor processor = getTemplateProcessorImpl(engine);
+           processor.process(template, model, out);
+        }
+        catch (TemplateException terr)
+        {
+           throw terr;
+        }
+        catch (Throwable err)
+        {
+           throw new TemplateException(err.getMessage(), err);
+        }
+    }
+
+    /**
+     * @see org.alfresco.service.cmr.repository.TemplateService#processTemplate(java.lang.String, java.lang.String, java.lang.Object)
+     */
+    public String processTemplate(String engine, String template, Object model)
+        throws TemplateException
+    {
+        Writer out = new StringWriter(1024);
+        processTemplate(engine, template, model, out);
+        return out.toString();
+    }
+
+    /**
+     * Return the TemplateProcessor implementation for the named template engine
+     * 
+     * @param name      Template Engine name
+     * 
+     * @return TemplateProcessor
+     */
+    private TemplateProcessor getTemplateProcessorImpl(String name)
+    {
+        // use the ThreadLocal map to find the processors instance
+        // create the cache map for this thread if required 
+        Map<String, TemplateProcessor> procMap = processors.get();
+        if (procMap == null)
+        {
+            procMap = new HashMap<String, TemplateProcessor>(7, 1.0f);
+            processors.set(procMap);
+        }
+        
+        if (name == null)
+        {
+            name = defaultTemplateEngine;
+        }
+        
+        // find the impl for the named processor
+        TemplateProcessor processor = procMap.get(name);
+        if (processor == null)
+        {
+            String className = templateEngines.get(name);
+            if (className == null)
+            {
+                throw new AlfrescoRuntimeException("Unable to find configured ClassName for template engine: " + name);
+            }
+            try
+            {
+                Object obj;
+                try
+                {
+                    obj = this.applicationContext.getBean(className);
+                }
+                catch (BeansException err)
+                {
+                    // instantiate the processor class directory if not a Spring bean
+                    obj = Class.forName(className).newInstance();
+                }
+                
+                if (obj instanceof TemplateProcessor)
+                {
+                    processor = (TemplateProcessor)obj;
+                }
+                else
+                {
+                    throw new AlfrescoRuntimeException("Supplied template processors does not implement TemplateProcessor: " + className);
+                }
+            }
+            catch (ClassNotFoundException err1)
+            {
+                // if the bean is not a classname, then it may be a spring bean Id
+                throw new AlfrescoRuntimeException("Unable to load class for supplied template processors: " + className, err1);
+            }
+            catch (IllegalAccessException err2)
+            {
+                throw new AlfrescoRuntimeException("Unable to load class for supplied template processors: " + className, err2);
+            }
+            catch (InstantiationException err3)
+            {
+                throw new AlfrescoRuntimeException("Unable to instantiate class for supplied template processors: " + className, err3);
+            }
+            
+            // cache for later
+            procMap.put(name, processor);
+        }
+        
+        return processor;
+    }
+}