Programming Groovy 2: Dynamic Productivity for the Java Developer / Edition 1
by Venkat SubramaniamISBN-10: 1937785300
ISBN-13: 9781937785307
Pub. Date: 07/22/2013
Publisher: Pragmatic Programmers, LLC, The
Groovy brings you the best of both worlds: a flexible, highly productive, agile, dynamic language that runs on the rich framework of the Java Platform. Groovy preserves the Java semantics and extends the JDK to give you true dynamic language capabilities. Programming Groovy 2 will help you, the experienced Java developer, learn and take advantage of the
Overview
Groovy brings you the best of both worlds: a flexible, highly productive, agile, dynamic language that runs on the rich framework of the Java Platform. Groovy preserves the Java semantics and extends the JDK to give you true dynamic language capabilities. Programming Groovy 2 will help you, the experienced Java developer, learn and take advantage of the latest version of this rich dynamic language. You'll go from the basics of Groovy to the latest advances in the language, including options for type checking, tail-call and memoization optimizations, compile time metaprogramming, and fluent interfaces to create DSLs.
You don't have to leave the rich Java Platform to take advantage of Groovy. Groovy preserves Java's semantics and extends the JDK, so programming in Groovy feels like the Java language has been augmented; it's like working with a lighter, more elegant Java. If you're an experienced Java developer who wants to learn how Groovy works, you'll find exactly what you need in this book.
You'll start with the fundamentals of programming in Groovy and how it works with Java, and then you'll explore advanced concepts such as unit testing with mock objects, using Builders, working with databases and XML, and creating DSLs. You'll master Groovy's powerful yet complex run-time and compile-time metaprogramming features.
Much has evolved in the Groovy language since the publication of the first edition of Programming Groovy. Programming Groovy 2 will help you learn and apply Groovy's new features. Creating DSLs is easier now, and Groovy's already-powerful metaprogramming facilities have improved even more. You'll see how to work with closures, including tail call optimization and memoization. The book also covers Groovy's new static compilation feature.
Whether you're learning the basics of the language or interested in getting proficient with the new features, Programming Groovy 2 has you covered.
What You Need
To work on the examples in the book you need Groovy 2.0.5 and Java JDK 5 or higher.
Product Details
- ISBN-13:
- 9781937785307
- Publisher:
- Pragmatic Programmers, LLC, The
- Publication date:
- 07/22/2013
- Edition description:
- Second Edition
- Pages:
- 370
- Sales rank:
- 1,322,493
- Product dimensions:
- 7.40(w) x 9.10(h) x 0.80(d)
Table of Contents
Foreword xvii
Introduction 1
Why Dynamic Languages? 1
What's Groovy? 4
Why Groovy? 5
What's in This Book? 8
Who Is This Book For? 11
Acknowledgments 11
Beginning Groovy 15
Getting Started 17
Getting Groovy 17
Installing Groovy 18
Test-Drive Using groovysh 19
Using groovyConsole 20
Running Groovy on the Command Line 21
Using an IDE 22
Groovy for the Java Eyes 25
From Java to Groovy 25
JavaBeans 33
Optional Parameters 38
Implementing Interfaces 39
Groovy boolean Evaluation 43
Operator Overloading 44
Support of Java 5 Language Features 47
Gotchas 55
Dynamic Typing 63
Typing in Java 63
Dynamic Typing 66
Dynamic Typing != Weak Typing 67
Design by Capability 68
Optional Typing 74
Types in Groovy 74
Multimethods 75
Dynamic: To Be or Not to Be? 79
Using Closures 81
Closures 81
Use of Closures 85
Working with Closures 87
Closure and Resource Cleanup 87
Closures and Coroutines 90
Curried Closure 91
Dynamic Closures 94
Closure Delegation 96
Using Closures 99
Working with Strings 101
Literals and Expressions 101
GString Lazy Evaluation Problem 104
Multiline String 108
String Convenience Methods 110
Regular Expressions 111
Working with Collections 115
Using List 115
Iterating Over an ArrayList 117
Finder Methods 120
Collections' Convenience Methods 121
Using Map 124
Iterating Over Map 126
Map Convenience Methods 128
Using Groovy 131
Exploring the GDK 133
Object Extensions 133
Other Extensions 139
Working with XML 147
Parsing XML 147
Creating XML 152
Working with Databases 157
Connecting to a Database 158
Database Select 159
Transforming Data to XML 160
Using DataSet 161
Inserting and Updating 162
Accessing Microsoft Excel 162
Working with Scripts and Classes 165
The Melting Pot of Java and Groovy 165
Running Groovy 166
Using Groovy Classes from Groovy 167
Using Groovy Classes from Java 168
Using Java Classes from Groovy 169
Using Groovy Scripts from Groovy 171
Using Groovy Scripts from Java 173
Ease of Integration 175
MOPping Groovy 177
Exploring Meta-Object Protocol (MOP) 179
Groovy Object 180
Querying Methods and Properties 185
Dynamically Accessing Objects 187
Intercepting Methods Using MOP 189
Intercepting Methods Using GroovyInterceptable 189
Intercepting Methods Using MetaClass 192
MOP Method Injection and Synthesis 197
Injecting Methods Using Categories 198
Injecting Methods Using ExpandoMetaClass 203
Injecting Methods into Specific Instances 207
Method Synthesis Using methodMissing 209
Method Synthesis Using ExpandoMetaClass 214
Synthesizing Methods for Specific Instances 217
MOPping Up 219
Creating Dynamic Classes with Expando 219
Method Delegation: Putting It All Together 222
Review of MOP Techniques 226
Unit Testing and Mocking 229
Code in This Book and Automated Unit Tests 229
Unit Testing Java and Groovy Code 231
Testing for Exceptions 235
Mocking 236
Mocking by Overriding 239
Mocking Using Categories 243
Mocking Using ExpandoMetaClass 244
Mocking Using Expando 246
Mocking Using Map 248
Mocking Using the Groovy Mock Library 249
Groovy Builders 255
Building XML 255
Building Swing 259
Custom Builder Using Metaprogramming 260
Using BuilderSupport 263
Using FactoryBuilderSupport 267
Creating DSLs in Groovy 273
Context 273
Fluency 275
Types of DSLs 276
Designing Internal DSLs 277
Groovy and DSLs 277
Closures and DSLs 278
Method Interception and DSLs 279
The Parentheses Limitation and a Workaround 281
Categories and DSLs 282
ExpandoMetaClass and DSLs 285
Web Resources 287
Bibliography 293
Index 295
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