Source Code Cross Referenced for DefaultExpanderResolver.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » lang » dsl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.lang.dsl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.drools.lang.dsl;
02:
03:        /*
04:         * Copyright 2005 JBoss Inc
05:         * 
06:         * Licensed under the Apache License, Version 2.0 (the "License");
07:         * you may not use this file except in compliance with the License.
08:         * You may obtain a copy of the License at
09:         * 
10:         *      http://www.apache.org/licenses/LICENSE-2.0
11:         * 
12:         * Unless required by applicable law or agreed to in writing, software
13:         * distributed under the License is distributed on an "AS IS" BASIS,
14:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15:         * See the License for the specific language governing permissions and
16:         * limitations under the License.
17:         */
18:
19:        import java.io.IOException;
20:        import java.io.Reader;
21:        import java.util.HashMap;
22:        import java.util.Map;
23:
24:        import org.drools.RuntimeDroolsException;
25:        import org.drools.lang.Expander;
26:        import org.drools.lang.ExpanderResolver;
27:
28:        /**
29:         * The default expander resolver will provide instances of the DefaultExpander.
30:         * The DefaultExpander uses templates to provide DSL and pseudo
31:         * natural language support.
32:         * 
33:         * @author Michael Neale
34:         */
35:        public class DefaultExpanderResolver implements  ExpanderResolver {
36:
37:            private final Map expanders = new HashMap();
38:
39:            /**
40:             * Create an empty resolver, which you will then
41:             * call addExpander multiple times, to map a specific expander
42:             * with a name that will be found in the drl after the expander keyword.
43:             */
44:            public DefaultExpanderResolver() {
45:            }
46:
47:            /**
48:             * This will load up a DSL from the reader specified.
49:             * This will make the expander available to any parser 
50:             * regardless of name.
51:             * 
52:             * The DSL expander will be the default expander.
53:             * 
54:             * This is the constructor most people should use.
55:             */
56:            public DefaultExpanderResolver(final Reader reader)
57:                    throws IOException {
58:                final DSLMappingFile file = new DSLMappingFile();
59:                if (file.parseAndLoad(reader)) {
60:                    final Expander expander = new DefaultExpander();
61:                    expander.addDSLMapping(file.getMapping());
62:                    this .expanders.put("*", expander);
63:                } else {
64:                    throw new RuntimeDroolsException(
65:                            "Error parsing and loading DSL file."
66:                                    + file.getErrors());
67:                }
68:            }
69:
70:            /**
71:             * Add an expander with the given name, which will be used
72:             * by looking for the "expander" keyword in the DRL.
73:             * 
74:             * If a default expander is installed, it will always be returned
75:             * if none matching the given name can be found.
76:             * 
77:             * You don't need to use this unless you have multiple expanders/DSLs
78:             * involved when compiling multiple rule packages at the same time.
79:             * If you don't know what that sentence means, you probably don't need to use this method.
80:             */
81:            public void addExpander(final String name, final Expander expander) {
82:                this .expanders.put(name, expander);
83:            }
84:
85:            public Expander get(final String name, final String config) {
86:                if (this .expanders.containsKey(name)) {
87:                    return (Expander) this .expanders.get(name);
88:                } else {
89:                    final Expander exp = (Expander) this .expanders.get("*");
90:                    if (exp == null) {
91:                        throw new IllegalArgumentException(
92:                                "Unable to provide an expander for " + name
93:                                        + " or a default expander.");
94:                    }
95:                    return exp;
96:                }
97:            }
98:
99:        }
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