groovy/modules/grails/src/web/org/codehaus/groovy/grails/web/pages/GroovyPage.java - groovy - Git at Google

 /*
  * Copyright 2004-2005 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.grails.web.pages;

 import groovy.lang.*;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.codehaus.groovy.grails.commons.GrailsApplication;
 import org.codehaus.groovy.grails.commons.GrailsTagLibClass;
 import org.codehaus.groovy.grails.web.metaclass.TagLibDynamicMethods;
 import org.codehaus.groovy.grails.web.servlet.DefaultGrailsApplicationAttributes;
 import org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes;
 import org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException;
 import org.springframework.context.ApplicationContext;

 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.beans.IntrospectionException;
 import java.io.IOException;
 import java.io.Writer;
 import java.util.HashMap;
 import java.util.Map;

 /**
  * NOTE: Based on work done by on the GSP standalone project (https://gsp.dev.java.net/)
  *
  * Base class for a GroovyPage (at the moment there is nothing in here but could be useful for providing utility methods
  * etc.
  *
  * @author Troy Heninger
  * @author Graeme Rocher
  *
  * Date: Jan 10, 2004
  *
  */
 public abstract class GroovyPage extends Script {
     private static final Log LOG = LogFactory.getLog(GroovyPage.class);

     public static final String REQUEST = "request";
     public static final String SERVLET_CONTEXT = "application";
     public static final String RESPONSE = "response";
     public static final String OUT = "out";
     public static final String ATTRIBUTES = "attributes";
     public static final String APPLICATION_CONTEXT = "applicationContext";
     public static final String SESSION = "session";
     public static final String PARAMS = "params";
     public static final String FLASH = "flash";
     private GrailsApplication application;
     private GrailsApplicationAttributes grailsAttributes;
     private ApplicationContext appContext;
     private Map tagLibs = new HashMap();

     /**
      * Convert from HTML to Unicode text.  This function converts many of the encoded HTML
      * characters to normal Unicode text.  Example: &amp;lt&semi; to &lt;.
      */
     public static String fromHtml(String text)
     {
         int ixz;
         if (text == null || (ixz = text.length()) == 0) return text;
         StringBuffer buf = new StringBuffer(ixz);
         String rep = null;
         for (int ix = 0; ix < ixz; ix++)
         {
             char c = text.charAt(ix);
             if (c == '&');
             {
                 String sub = text.substring(ix + 1).toLowerCase();
                 if (sub.startsWith("lt;"))
                 {
                     c = '<';
                     ix += 3;
                 }
                 else
                 if (sub.startsWith("gt;"))
                 {
                     c = '>';
                     ix += 3;
                 }
                 else
                 if (sub.startsWith("amp;"))
                 {
                     c = '&';
                     ix += 4;
                 }
                 else
                 if (sub.startsWith("nbsp;"))
                 {
                     c = ' ';
                     ix += 5;
                 }
                 else
                 if (sub.startsWith("semi;"))
                 {
                     c = ';';
                     ix += 5;
                 }
                 else
                 if (sub.startsWith("#"))
                 {
                     char c2 = 0;
                     for (int iy = ix + 1; iy < ixz; iy++)
                     {
                         char c1 = text.charAt(iy);
                         if (c1 >= '0' && c1 <= '9')
                         {
                             c2 = (char)(c2 * 10 + c1);
                             continue;
                         }
                         if (c1 == ';')
                         {
                             c = c2;
                             ix = iy;
                         }
                         break;
                     }
                 }
             }
             if (rep != null)
             {
                 buf.append(rep);
                 rep = null;
             }
             else buf.append(c);
         }
         return buf.toString();
     } // fromHtml()

     public Object getProperty(String property) {
         // in GSP we assume if a property doesn't exist that
         // it is null rather than throw an error this works nicely
         // with the Groovy Truth
         try {
             return super.getProperty(property);
         } catch (MissingPropertyException mpe) {
               if(LOG.isDebugEnabled()) {
                   LOG.debug("No property ["+property+"] found in GSP returning null");
               }
               return null;
         }
     }

     /**
      * Attempts to invokes a dynamic tag
      *
      * @param tagName The name of the tag
      * @param attrs The tags attributes
      * @param body  The body of the tag as a closure
      */
     public void invokeTag(String tagName, Map attrs, Closure body) {
         Binding binding = getBinding();

         Writer out = (Writer)binding.getVariable(GroovyPage.OUT);

         if(this.application == null)
             initPageState();

         GroovyObject tagLib = getTagLib(tagName);

         if(tagLib != null) {
             tagLib.setProperty(  TagLibDynamicMethods.OUT_PROPERTY, out );
             Object tagLibProp;
             try {
                 tagLibProp = tagLib.getProperty(tagName);
             } catch (MissingPropertyException mpe) {
                 throw new GrailsTagException("Tag ["+tagName+"] does not exist in tag library ["+tagLib.getClass().getName()+"]");
             }
             if(tagLibProp instanceof Closure) {
                 Closure tag = (Closure)tagLibProp;
                 if(tag.getParameterTypes().length == 1) {
                     tag.call( new Object[]{ attrs });
                     if(body != null) {
                         body.call();
                     }
                 }
                 if(tag.getParameterTypes().length == 2) {
                     tag.call( new Object[] { attrs, body });
                 }
             }else {
                throw new GrailsTagException("Tag ["+tagName+"] does not exist in tag library ["+tagLib.getClass().getName()+"]");
             }
         }
         else {
             throw new GrailsTagException("Tag ["+tagName+"] does not exist. No tag library found.");
         }
     }

     private void initPageState() {
         if(this.application == null) {
             ServletContext context = (ServletContext)getBinding().getVariable(SERVLET_CONTEXT);
             this.grailsAttributes = new DefaultGrailsApplicationAttributes(context);
             this.application = grailsAttributes.getGrailsApplication();
             this.appContext = grailsAttributes.getApplicationContext();
         }
     }

     private GroovyObject getTagLib(String tagName) {
         if(this.application == null)
             initPageState();
         Binding binding = getBinding();
         HttpServletRequest request = (HttpServletRequest)binding.getVariable(GroovyPage.REQUEST);
         HttpServletResponse response = (HttpServletResponse)binding.getVariable(GroovyPage.RESPONSE);

         GrailsTagLibClass tagLibClass = application.getTagLibClassForTag(tagName);
         if(tagLibClass == null)
             return null;

         GroovyObject tagLib;
         if(tagLibs.containsKey(tagLibClass.getFullName())) {
              tagLib = (GroovyObject)tagLibs.get(tagLibClass.getFullName());
         }
         else {
             tagLib = (GroovyObject)appContext.getBean(tagLibClass.getFullName());
             try {
                 new TagLibDynamicMethods(tagLib,grailsAttributes.getController(request));
             } catch (IntrospectionException e) {
                 throw new GrailsTagException("Error instantiating taglib ["+tagLibClass.getFullName()+"]: " + e.getMessage(),e);
             }
             tagLibs.put(tagLibClass.getFullName(),tagLib);
         }
         return tagLib;
     }

     /**
      * Allows invoking of taglibs as method calls with simple bodies. The bodies should only contain text
      *
      * @param methodName The methodName of the tag to call or the methodName of a method on GroovPage
      * @param args The Arguments
      *
      * @return The result of the invocation
      */
     public Object invokeMethod(final String methodName, Object args) {

         try {
             return super.invokeMethod(methodName, args);
         }
         catch(MissingMethodException mme) {
           if(LOG.isDebugEnabled()) {
               LOG.debug("No method ["+methodName+"] found invoking as tag");
           }
             Map attrs = null;
             Object body = null;
             // retrieve tag lib and writer from binding
             Binding binding = getBinding();
             final Writer out = (Writer)binding.getVariable(GroovyPage.OUT);
             GroovyObject tagLib = getTagLib(methodName);

             // get attributes and body closure
             if (args instanceof Object[]) {
                 Object[] argArray = (Object[])args;
                 if(argArray.length > 0 && argArray[0] instanceof Map)
                     attrs = (Map)argArray[0];
                 if(argArray.length > 1) {
                     body = argArray[1];

                 }
             }
             else if(args instanceof Map) {
                 attrs = (Map)args;
             }

             if(attrs == null) {
                 attrs = new HashMap();
             }

             // in a direct invocation the body is expected to return a string
             // invoke the body closure and create a new closure that outputs
             // to the response writer on each body invokation
             final Object body1 = body;
             Closure actualBody = new Closure(this) {
                 public Object doCall(Object obj) {
                     return call(new Object[] {obj} );
                 }
                 public Object doCall() {
                     return call(new Object[0]);
                 }
                 public Object doCall(Object[] args) {
                     return call(args);
                 }
                 public Object call(Object[] args) {
                     if(body1 != null) {
                         Object bodyResponse;
                         if(body1 instanceof Closure) {
                             bodyResponse = ((Closure)body1).call();
                         }
                         else {
                             bodyResponse = body1;
                         }

                         if(bodyResponse instanceof String) {
                             try {
                                 out.write(bodyResponse.toString());
                             } catch (IOException e) {
                                 throw new GrailsTagException("I/O error invoking tag library closure ["+methodName+"] as method");
                             }
                         }
                     }
                     return null;
                 }
             };

             if(tagLib != null) {
                 tagLib.setProperty(  TagLibDynamicMethods.OUT_PROPERTY, out );
                 Object tagLibProp;
                 try {
                     tagLibProp = tagLib.getProperty(methodName);
                     if(tagLibProp instanceof Closure) {
                         Closure tag = (Closure)tagLibProp;
                         if(tag.getParameterTypes().length == 1) {
                             tag.call( new Object[]{ attrs });
                             if(actualBody != null) {
                                 actualBody.call();
                             }
                             return null;
                         }
                         if(tag.getParameterTypes().length == 2) {
                             tag.call( new Object[] { attrs, actualBody });
                             return null;
                         }
                     }else {
                        throw new GrailsTagException("Tag ["+methodName+"] does not exist in tag library ["+tagLib.getClass().getName()+"]");
                     }
                 } catch (MissingPropertyException mpe) {
                     if(args instanceof Object[])
                         throw new MissingMethodException(methodName,GroovyPage.class, (Object[])args);
                     else
                         throw new MissingMethodException(methodName,GroovyPage.class, new Object[]{ args });
                 }

             }
             throw new MissingMethodException(methodName,GroovyPage.class, new Object[]{ args });
         }
     }
 } // GroovyPage
	/*
	* Copyright 2004-2005 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.grails.web.pages;

	import groovy.lang.*;
	import org.apache.commons.logging.Log;
	import org.apache.commons.logging.LogFactory;
	import org.codehaus.groovy.grails.commons.GrailsApplication;
	import org.codehaus.groovy.grails.commons.GrailsTagLibClass;
	import org.codehaus.groovy.grails.web.metaclass.TagLibDynamicMethods;
	import org.codehaus.groovy.grails.web.servlet.DefaultGrailsApplicationAttributes;
	import org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes;
	import org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException;
	import org.springframework.context.ApplicationContext;

	import javax.servlet.ServletContext;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;
	import java.beans.IntrospectionException;
	import java.io.IOException;
	import java.io.Writer;
	import java.util.HashMap;
	import java.util.Map;

	/**
	* NOTE: Based on work done by on the GSP standalone project (https://gsp.dev.java.net/)
	*
	* Base class for a GroovyPage (at the moment there is nothing in here but could be useful for providing utility methods
	* etc.
	*
	* @author Troy Heninger
	* @author Graeme Rocher
	*
	* Date: Jan 10, 2004
	*
	*/
	public abstract class GroovyPage extends Script {
	private static final Log LOG = LogFactory.getLog(GroovyPage.class);

	public static final String REQUEST = "request";
	public static final String SERVLET_CONTEXT = "application";
	public static final String RESPONSE = "response";
	public static final String OUT = "out";
	public static final String ATTRIBUTES = "attributes";
	public static final String APPLICATION_CONTEXT = "applicationContext";
	public static final String SESSION = "session";
	public static final String PARAMS = "params";
	public static final String FLASH = "flash";
	private GrailsApplication application;
	private GrailsApplicationAttributes grailsAttributes;
	private ApplicationContext appContext;
	private Map tagLibs = new HashMap();

	/**
	* Convert from HTML to Unicode text. This function converts many of the encoded HTML
	* characters to normal Unicode text. Example: &lt&semi; to <.
	*/
	public static String fromHtml(String text)
	{
	int ixz;
	if (text == null \|\| (ixz = text.length()) == 0) return text;
	StringBuffer buf = new StringBuffer(ixz);
	String rep = null;
	for (int ix = 0; ix < ixz; ix++)
	{
	char c = text.charAt(ix);
	if (c == '&');
	{
	String sub = text.substring(ix + 1).toLowerCase();
	if (sub.startsWith("lt;"))
	{
	c = '<';
	ix += 3;
	}
	else
	if (sub.startsWith("gt;"))
	{
	c = '>';
	ix += 3;
	}
	else
	if (sub.startsWith("amp;"))
	{
	c = '&';
	ix += 4;
	}
	else
	if (sub.startsWith("nbsp;"))
	{
	c = ' ';
	ix += 5;
	}
	else
	if (sub.startsWith("semi;"))
	{
	c = ';';
	ix += 5;
	}
	else
	if (sub.startsWith("#"))
	{
	char c2 = 0;
	for (int iy = ix + 1; iy < ixz; iy++)
	{
	char c1 = text.charAt(iy);
	if (c1 >= '0' && c1 <= '9')
	{
	c2 = (char)(c2 * 10 + c1);
	continue;
	}
	if (c1 == ';')
	{
	c = c2;
	ix = iy;
	}
	break;
	}
	}
	}
	if (rep != null)
	{
	buf.append(rep);
	rep = null;
	}
	else buf.append(c);
	}
	return buf.toString();
	} // fromHtml()

	public Object getProperty(String property) {
	// in GSP we assume if a property doesn't exist that
	// it is null rather than throw an error this works nicely
	// with the Groovy Truth
	try {
	return super.getProperty(property);
	} catch (MissingPropertyException mpe) {
	if(LOG.isDebugEnabled()) {
	LOG.debug("No property ["+property+"] found in GSP returning null");
	}
	return null;
	}
	}

	/**
	* Attempts to invokes a dynamic tag
	*
	* @param tagName The name of the tag
	* @param attrs The tags attributes
	* @param body The body of the tag as a closure
	*/
	public void invokeTag(String tagName, Map attrs, Closure body) {
	Binding binding = getBinding();

	Writer out = (Writer)binding.getVariable(GroovyPage.OUT);

	if(this.application == null)
	initPageState();

	GroovyObject tagLib = getTagLib(tagName);

	if(tagLib != null) {
	tagLib.setProperty( TagLibDynamicMethods.OUT_PROPERTY, out );
	Object tagLibProp;
	try {
	tagLibProp = tagLib.getProperty(tagName);
	} catch (MissingPropertyException mpe) {
	throw new GrailsTagException("Tag ["+tagName+"] does not exist in tag library ["+tagLib.getClass().getName()+"]");
	}
	if(tagLibProp instanceof Closure) {
	Closure tag = (Closure)tagLibProp;
	if(tag.getParameterTypes().length == 1) {
	tag.call( new Object[]{ attrs });
	if(body != null) {
	body.call();
	}
	}
	if(tag.getParameterTypes().length == 2) {
	tag.call( new Object[] { attrs, body });
	}
	}else {
	throw new GrailsTagException("Tag ["+tagName+"] does not exist in tag library ["+tagLib.getClass().getName()+"]");
	}
	}
	else {
	throw new GrailsTagException("Tag ["+tagName+"] does not exist. No tag library found.");
	}
	}

	private void initPageState() {
	if(this.application == null) {
	ServletContext context = (ServletContext)getBinding().getVariable(SERVLET_CONTEXT);
	this.grailsAttributes = new DefaultGrailsApplicationAttributes(context);
	this.application = grailsAttributes.getGrailsApplication();
	this.appContext = grailsAttributes.getApplicationContext();
	}
	}

	private GroovyObject getTagLib(String tagName) {
	if(this.application == null)
	initPageState();
	Binding binding = getBinding();
	HttpServletRequest request = (HttpServletRequest)binding.getVariable(GroovyPage.REQUEST);
	HttpServletResponse response = (HttpServletResponse)binding.getVariable(GroovyPage.RESPONSE);

	GrailsTagLibClass tagLibClass = application.getTagLibClassForTag(tagName);
	if(tagLibClass == null)
	return null;

	GroovyObject tagLib;
	if(tagLibs.containsKey(tagLibClass.getFullName())) {
	tagLib = (GroovyObject)tagLibs.get(tagLibClass.getFullName());
	}
	else {
	tagLib = (GroovyObject)appContext.getBean(tagLibClass.getFullName());
	try {
	new TagLibDynamicMethods(tagLib,grailsAttributes.getController(request));
	} catch (IntrospectionException e) {
	throw new GrailsTagException("Error instantiating taglib ["+tagLibClass.getFullName()+"]: " + e.getMessage(),e);
	}
	tagLibs.put(tagLibClass.getFullName(),tagLib);
	}
	return tagLib;
	}

	/**
	* Allows invoking of taglibs as method calls with simple bodies. The bodies should only contain text
	*
	* @param methodName The methodName of the tag to call or the methodName of a method on GroovPage
	* @param args The Arguments
	*
	* @return The result of the invocation
	*/
	public Object invokeMethod(final String methodName, Object args) {

	try {
	return super.invokeMethod(methodName, args);
	}
	catch(MissingMethodException mme) {
	if(LOG.isDebugEnabled()) {
	LOG.debug("No method ["+methodName+"] found invoking as tag");
	}
	Map attrs = null;
	Object body = null;
	// retrieve tag lib and writer from binding
	Binding binding = getBinding();
	final Writer out = (Writer)binding.getVariable(GroovyPage.OUT);
	GroovyObject tagLib = getTagLib(methodName);

	// get attributes and body closure
	if (args instanceof Object[]) {
	Object[] argArray = (Object[])args;
	if(argArray.length > 0 && argArray[0] instanceof Map)
	attrs = (Map)argArray[0];
	if(argArray.length > 1) {
	body = argArray[1];

	}
	}
	else if(args instanceof Map) {
	attrs = (Map)args;
	}

	if(attrs == null) {
	attrs = new HashMap();
	}

	// in a direct invocation the body is expected to return a string
	// invoke the body closure and create a new closure that outputs
	// to the response writer on each body invokation
	final Object body1 = body;
	Closure actualBody = new Closure(this) {
	public Object doCall(Object obj) {
	return call(new Object[] {obj} );
	}
	public Object doCall() {
	return call(new Object[0]);
	}
	public Object doCall(Object[] args) {
	return call(args);
	}
	public Object call(Object[] args) {
	if(body1 != null) {
	Object bodyResponse;
	if(body1 instanceof Closure) {
	bodyResponse = ((Closure)body1).call();
	}
	else {
	bodyResponse = body1;
	}

	if(bodyResponse instanceof String) {
	try {
	out.write(bodyResponse.toString());
	} catch (IOException e) {
	throw new GrailsTagException("I/O error invoking tag library closure ["+methodName+"] as method");
	}
	}
	}
	return null;
	}
	};

	if(tagLib != null) {
	tagLib.setProperty( TagLibDynamicMethods.OUT_PROPERTY, out );
	Object tagLibProp;
	try {
	tagLibProp = tagLib.getProperty(methodName);
	if(tagLibProp instanceof Closure) {
	Closure tag = (Closure)tagLibProp;
	if(tag.getParameterTypes().length == 1) {
	tag.call( new Object[]{ attrs });
	if(actualBody != null) {
	actualBody.call();
	}
	return null;
	}
	if(tag.getParameterTypes().length == 2) {
	tag.call( new Object[] { attrs, actualBody });
	return null;
	}
	}else {
	throw new GrailsTagException("Tag ["+methodName+"] does not exist in tag library ["+tagLib.getClass().getName()+"]");
	}
	} catch (MissingPropertyException mpe) {
	if(args instanceof Object[])
	throw new MissingMethodException(methodName,GroovyPage.class, (Object[])args);
	else
	throw new MissingMethodException(methodName,GroovyPage.class, new Object[]{ args });
	}

	}
	throw new MissingMethodException(methodName,GroovyPage.class, new Object[]{ args });
	}
	}
	} // GroovyPage