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JRuby
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| require 'erb' | |
| require 'ostruct' | |
| require 'java' | |
| # Renders an ERB template against a hashmap of variables. | |
| # template should be a Java InputStream | |
| def render(template, variables) | |
| context = OpenStruct.new(variables).instance_eval do | |
| variables.each do |k, v| | |
| instance_variable_set(k, v) if k[0] == '@' | |
| end | |
| def partial(partial_name, options={}) | |
| new_variables = marshal_dump.merge(options[:locals] || {}) | |
| Java::Pavo::ERB.render(partial_name, new_variables) | |
| end | |
| binding | |
| end | |
| ERB.new(template.to_io.read).result(context); | |
| end | |
| # Renders an ERB template wrapped in an ERB layout. | |
| # template and layout should both be Java InputStreams | |
| def render_with_layout(template, layout, variables) | |
| render(layout, variables) do | |
| render(template, variables) | |
| end | |
| end |
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| package pavo; | |
| import java.io.*; | |
| import java.util.*; | |
| import javax.script.*; | |
| public class ERB { | |
| static ScriptEngine jruby = initializeJRuby(); | |
| static ScriptEngine initializeJRuby() { | |
| try (InputStream bootstrap = ERB.class.getResourceAsStream("bootstrap.rb")) { | |
| ScriptEngine jruby = new ScriptEngineManager().getEngineByName("jruby"); | |
| jruby.eval(new InputStreamReader(bootstrap)); | |
| return jruby; | |
| } catch (Exception e) { | |
| throw new RuntimeException(e); | |
| } | |
| } | |
| public static InputStream openTemplate(String name) { | |
| return ERB.class.getResourceAsStream(name + ".erb"); | |
| } | |
| public static String render(String template, Map<String,Object> variables) throws Exception { | |
| try (InputStream stream = openTemplate(template)) { | |
| return (String) ((Invocable)jruby).invokeFunction("render", stream, variables); | |
| } | |
| } | |
| /** | |
| * Render an ERB template wrapped in a ERB layout. | |
| */ | |
| public static String render(String template, String layout, Map<String,Object> variables) throws Exception { | |
| try (InputStream templateStream = openTemplate(template); | |
| InputStream layoutStream = openTemplate(layout)) { | |
| return (String) ((Invocable)jruby).invokeFunction("render_with_layout", | |
| templateStream, layoutStream, variables); | |
| } | |
| } | |
| } |
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| Hello <%= @user %> | |
| <%= partial("partial", :locals => {:city => "canberra"}) %> |
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| package pavo; | |
| import java.util.*; | |
| import javax.ws.rs.*; | |
| @Path("/") | |
| public class HelloController { | |
| @GET | |
| public String hello() throws Exception { | |
| Map<String,Object> variables = new HashMap<>(); | |
| variables.put("@title", "The Home Page"); | |
| variables.put("@user", "Michael"); | |
| return ERB.render("hello.erb", variables); | |
| } | |
| } |
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| <html> | |
| <head><title><%= @title %></title></head> | |
| <body><%= yield %></body> | |
| </html> |
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| <p>I am a partial. You are <%= @user %> in <%= city %>.</p> |
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| <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | |
| <modelVersion>4.0.0</modelVersion> | |
| <groupId>au.gov.nla</groupId> | |
| <artifactId>erbtest</artifactId> | |
| <version>0.0.1-SNAPSHOT</version> | |
| <packaging>war</packaging> | |
| <properties> | |
| <maven.compiler.source>1.7</maven.compiler.source> | |
| <maven.compiler.target>1.7</maven.compiler.target> | |
| </properties> | |
| <build> | |
| <plugins> | |
| <plugin> | |
| <groupId>org.eclipse.jetty</groupId> | |
| <artifactId>jetty-maven-plugin</artifactId> | |
| </plugin> | |
| </plugins> | |
| </build> | |
| <dependencies> | |
| <dependency> | |
| <groupId>org.jruby</groupId> | |
| <artifactId>jruby-complete</artifactId> | |
| <version>1.7.0.RC1</version> | |
| </dependency> | |
| <dependency> | |
| <groupId>com.sun.jersey</groupId> | |
| <artifactId>jersey-servlet</artifactId> | |
| <version>1.17.1</version> | |
| </dependency> | |
| </dependencies> | |
| </project> |
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| <?xml version="1.0" encoding="UTF-8"?> | |
| <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" | |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" | |
| id="WebApp_ID" version="2.5"> | |
| <servlet> | |
| <servlet-name>pavo</servlet-name> | |
| <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> | |
| <init-param> | |
| <param-name>com.sun.jersey.config.property.packages</param-name> | |
| <param-value>pavo</param-value> | |
| </init-param> | |
| <load-on-startup>1</load-on-startup> | |
| </servlet> | |
| <servlet-mapping> | |
| <servlet-name>pavo</servlet-name> | |
| <url-pattern>/*</url-pattern> | |
| </servlet-mapping> | |
| </web-app> |
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