package org.apache.velocity.runtime.directive;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import java.io.IOException;
import java.io.Writer;
import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.exception.TemplateInitException;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.RuntimeServices;
import org.apache.velocity.runtime.parser.node.Node;
/**
* BlockMacro directive is used to invoke Velocity macros with normal parameters and a macro body.
* <p>
* The macro can then refer to the passed body AST. This directive can be used as a
* "decorator". Body AST can contain any valid Velocity syntax.
*
* An example:
* <pre>
* #set($foobar = "yeah!")
*
* #macro(strong $txt)
* <strong>$bodyContent</strong> $txt
* #end
*
* #@strong($foobar)
* <u>This text is underlined and bold</u>
* #end
* </pre>
* Will print:
* <pre>
* <strong><u>This text is underlined and bold<u></strong> yeah!
* </pre>
*
* bodyContent reference name is configurable (see velocity.properties).
*
* @author <a href="mailto:[email protected]">Jarkko Viinamaki</a>
* @since 1.7
* @version $Id$
*/
public class BlockMacro extends Block
{
private String name;
private RuntimeMacro macro;
public BlockMacro(String name)
{
this.name = name;
}
public String getName()
{
return key;
}
/**
* Override to use the macro name, since it is within an
* #@myMacro() ... #end block that the scope in question
* would be used.
*/
public String getScopeName()
{
return name;
}
/**
* Initializes the directive.
*
* @param rs
* @param context
* @param node
* @throws TemplateInitException
*/
public void init(RuntimeServices rs, InternalContextAdapter context, Node node)
throws TemplateInitException
{
super.init(rs, context, node);
// get name of the reference that refers to AST block passed to block macro call
key = rsvc.getString(RuntimeConstants.VM_BODY_REFERENCE, "bodyContent");
// use the macro max depth for bodyContent max depth as well
maxDepth = rs.getInt(RuntimeConstants.VM_MAX_DEPTH);
macro = new RuntimeMacro(name);
macro.setLocation(getLine(), getColumn(), getTemplateName());
macro.init(rs, context, node);
}
/**
* Renders content using the selected macro and the passed AST body.
*
* @param context
* @param writer
* @param node
* @return True if the directive rendered successfully.
* @throws IOException
*/
public boolean render(InternalContextAdapter context, Writer writer, Node node)
throws IOException
{
return macro.render(context, writer, node, new Reference(context, this));
}
}
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