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1
25 package org.ofbiz.base.util;
26
27 import java.io.IOException  ;
28 import java.io.InputStreamReader ;
29 import java.io.Reader ;
30 import java.io.StringReader ;
31 import java.net.MalformedURLException ;
32 import java.net.URL ;
33 import java.util.HashMap ;
34 import java.util.Iterator ;
35 import java.util.Map ;
36 import java.util.Set ;
37
38 import org.ofbiz.base.location.FlexibleLocation;
39 import org.ofbiz.base.util.cache.UtilCache;
40
41 import bsh.BshClassManager;
42 import bsh.EvalError;
43 import bsh.Interpreter;
44 import bsh.NameSpace;
45 import bsh.ParseException;
46
47
56 public final class BshUtil {
57
58 public static final String module = BshUtil.class.getName();
59
60 protected static Map masterClassManagers = new HashMap ();
61 public static UtilCache parsedScripts = new UtilCache("script.BshLocationParsedCache", 0, 0, false);
62
63
70 public static final Object eval(String expression, Map context) throws EvalError {
71 Object o = null;
72 if (expression == null || expression.equals("")) {
73 Debug.logError("BSH Evaluation error. Empty expression", module);
74 return null;
75 }
76
77 if (Debug.verboseOn())
78 Debug.logVerbose("Evaluating -- " + expression, module);
79 if (Debug.verboseOn())
80 Debug.logVerbose("Using Context -- " + context, module);
81
82 try {
83 Interpreter bsh = makeInterpreter(context);
84 o = bsh.eval(expression);
86 if (Debug.verboseOn())
87 Debug.logVerbose("Evaluated to -- " + o, module);
88
89 NameSpace ns = bsh.getNameSpace();
91 String [] varNames = ns.getVariableNames();
92 for (int x = 0; x < varNames.length; x++) {
93 context.put(varNames[x], bsh.get(varNames[x]));
94 }
95 } catch (EvalError e) {
96 Debug.logError(e, "BSH Evaluation error.", module);
97 throw e;
98 }
99 return o;
100 }
101
102 public static Interpreter makeInterpreter(Map context) throws EvalError {
103 Interpreter bsh = getMasterInterpreter(null);
104 if (context != null) {
106 Set keySet = context.keySet();
107 Iterator i = keySet.iterator();
108 while (i.hasNext()) {
109 Object key = i.next();
110 Object value = context.get(key);
111 bsh.set((String ) key, value);
112 }
113
114 bsh.set("context", context);
116 }
117
118 return bsh;
119 }
120
121 public static Interpreter getMasterInterpreter(ClassLoader classLoader) {
122 if (classLoader == null) {
123 classLoader = Thread.currentThread().getContextClassLoader();
124 }
125
126 BshClassManager master = (BshClassManager) BshUtil.masterClassManagers.get(classLoader);
128 if (master == null) {
129 synchronized (OfbizBshBsfEngine.class) {
130 master = (BshClassManager) BshUtil.masterClassManagers.get(classLoader);
131 if (master == null) {
132 master = BshClassManager.createClassManager();
133 master.setClassLoader(classLoader);
134 BshUtil.masterClassManagers.put(classLoader, master);
135 }
136 }
137 }
138
139 if (master != null) {
140 Interpreter interpreter = new Interpreter(new StringReader (""), System.out, System.err,
141 false, new NameSpace(master, "global"), null, null);
142 return interpreter;
143 } else {
144 Interpreter interpreter = new Interpreter();
145 interpreter.setClassLoader(classLoader);
146 return interpreter;
147 }
148 }
149
150 public static Object runBshAtLocation(String location, Map context) throws GeneralException {
151 try {
152 Interpreter interpreter = makeInterpreter(context);
153
154 Interpreter.ParsedScript script = null;
155 script = (Interpreter.ParsedScript) parsedScripts.get(location);
156 if (script == null) {
157 synchronized (OfbizBshBsfEngine.class) {
158 script = (Interpreter.ParsedScript) parsedScripts.get(location);
159 if (script == null) {
160 URL scriptUrl = FlexibleLocation.resolveLocation(location);
161 Reader scriptReader = new InputStreamReader (scriptUrl.openStream());
162 script = interpreter.parseScript(location, scriptReader);
163 if (Debug.verboseOn()) Debug.logVerbose("Caching BSH script at: " + location, module);
164 parsedScripts.put(location, script);
165 }
166 }
167 }
168
169 return interpreter.evalParsedScript(script);
170 } catch (MalformedURLException e) {
171 String errMsg = "Error loading BSH script at [" + location + "]: " + e.toString();
172 Debug.logError(e, errMsg, module);
173 throw new GeneralException(errMsg, e);
174 } catch (ParseException e) {
175 String errMsg = "Error parsing BSH script at [" + location + "]: " + e.toString();
176 Debug.logError(e, errMsg, module);
177 throw new GeneralException(errMsg, e);
178 } catch (IOException e) {
179 String errMsg = "Error loading BSH script at [" + location + "]: " + e.toString();
180 Debug.logError(e, errMsg, module);
181 throw new GeneralException(errMsg, e);
182 } catch (EvalError ee) {
183 Throwable t = ee.getCause();
184 if (t == null) {
185 Debug.logWarning(ee, "WARNING: no cause (from getCause) found for BSH EvalError: " + ee.toString(), module);
186 t = ee;
187 } else {
188 Debug.logError(t, "ERROR: Got cause (from getCause) for BSH EvalError: " + ee.toString(), module);
189 }
190
191 String errMsg = "Error running BSH script at [" + location + "], line [" + ee.getErrorLineNumber() + "]: " + t.toString();
192 throw new GeneralException(errMsg, t);
194 }
195 }
196 }
197 |
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