1 /*
2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.sjavac;
27
28 import java.io.PrintStream;
29 import java.net.URI;
30 import java.util.Set;
31 import java.util.Map;
32
33 import com.sun.tools.sjavac.options.Options;
34 import com.sun.tools.sjavac.server.Sjavac;
35
36 /**
37 * The transform interface is used to transform content inside a package, from one form to another.
38 * Usually the output form is an unpredictable number of output files. (eg class files)
39 * but can also be an unpredictable number of generated source files (eg idl2java)
40 * or a single predictable output file (eg when copying,cleaning or compiling a properties file).
41 *
42 * <p><b>This is NOT part of any supported API.
43 * If you write code that depends on this, you do so at your own risk.
44 * This code and its internal interfaces are subject to change or
45 * deletion without notice.</b>
46 */
47 public interface Transformer {
48 /**
49 * The transform method takes a set of package names, mapped to their source files and to the
50 * pubapis of the packages.
51 *
52 * The transform implementation must:
53 * store the names of the generated artifacts for each package into package_artifacts
54 * store found dependencies to other packages into the supplied set package_dependencies
55 * store the public api for a package into the supplied set package_pubapis
56 *
57 * Any benign messages as a result of running the transform
58 * are written into stdout, and errors are written to stderr.
59 *
60 * The debug_level can be 0=silent (only warnings and errors) 1=normal 2=verbose 3 or greater=debug
61 * setExtra is used to set the extra information information that can be passed on
62 * the command line to the smart javac wrapper.
63 *
64 * If sjavac is building incrementally from an existing javac_state, the var incremental is true.
65 *
66 * The transformer will only be called if some source in the package (or dependency) has
67 * a modified timestamp. Thus the transformer might get called with many sources, of which
68 * only one has changed. The transformer is allowed to regenerate all artifacts but
69 * a better transformer will only write those artifacts that need updating.
70 *
71 * However the transformer must verify that the existing artifacts really are there!
72 * and it must always update package_artifacts, package_dependencies, and package_pubapis correctly.
73 * This means that at least for Java source, it will always have to recompile the sources.
74 *
75 * The transformer is allowed to put files anywhere in the dest_root.
76 * An example of this is, can be the META-INF transformer that copy files
77 * below META-INF directories to the single META-INF directory below dest_root.
78 *
79 * False is returned if there was an error that prevented the transform.
80 * I.e. something was printed on stderr.
81 *
82 * If num_cores is set to a non-zero value. The transform should attempt to use no more than these
83 * number of threads for heavy work.
84 */
85 boolean transform(Sjavac sjavac,
86 Map<String,Set<URI>> pkgSrcs,
87 Set<URI> visibleSources,
88 Map<URI,Set<String>> visibleClasses,
89 Map<String,Set<String>> oldPackageDependencies,
90 URI destRoot,
91 Map<String,Set<URI>> packageArtifacts,
92 Map<String,Set<String>> packageDependencies,
93 Map<String,String> packagePublicApis,
94 int debugLevel,
95 boolean incremental,
96 int numCores,
97 PrintStream out,
98 PrintStream err);
99
100 void setExtra(String e);
101 void setExtra(Options args);
102 }