/* * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /** *

Library for generating Java source code

. * *

* CodeModel is a library that allows you to generate Java source * code in a type-safe fashion. * *

* With CodeModel, you build the java source code by first building AST, * then writing it out as text files that is Java source files. * The AST looks like this: * *

* You bulid this tree mostly from top-down. So, you first create * a new {@link JDefinedClass} from {@link JCodeModel}, then you * create a {@link JMethod} from {@link JDefinedClass}, and so on. * *

* This design brings the following beneefits: * *

* * The price you pay for that is * increased memory footprint and the generation speed. * See performance section for * more discussions about the performance and possible improvements. * * *

Using CodeModel

*

* {@link com.sun.codemodel.internal.JCodeModel} is the entry point to * the library. See its javadoc for more details about how to use * CodeModel. * * * *

Performance

*

* Generally speaking, CodeModel is expected to be used in * an environment where the resource constraint is not severe. * Therefore, we haven't spent much effort in trying to make * this library lean and mean. * *

* That said, we did some benchmark and performance analysis. * In case anyone is interested in making this library * better performance wise, here's the findings. * *

* {@link List}s {@link Map}s, and other collections take up * a lot of space. Allocating those things lazily is generally * a good idea. * *

* Compared to template-based code generator, the writing operation * is slow, as it needs to traverse each AST node. Consider * pre-encoding tokens (like 'public') to the target encoding, * and consider exploting the subtree equivalence. * */ package com.sun.codemodel.internal; import java.util.List; import java.util.Map;