private ValueSource getDistanceValueSource() {
Expression distance;
try {
distance =
JavascriptCompiler.compile(
"haversin(" + ORIGIN_LATITUDE + "," + ORIGIN_LONGITUDE + ",latitude,longitude)");
} catch (ParseException pe) {
// Should not happen
throw new RuntimeException(pe);
}
SimpleBindings bindings = new SimpleBindings();
bindings.add(new SortField("latitude", SortField.Type.DOUBLE));
bindings.add(new SortField("longitude", SortField.Type.DOUBLE));
return distance.getValueSource(bindings);
}
// series of unit test for using expressions as executable scripts
public void testExecutableScripts() throws Exception {
Map<String, Object> vars = new HashMap<>();
vars.put("a", 2.5);
vars.put("b", 3);
vars.put("xyz", -1);
Expression expr = JavascriptCompiler.compile("a+b+xyz");
CompiledScript compiledScript = new CompiledScript(ScriptType.INLINE, "", "expression", expr);
ExpressionExecutableScript ees = new ExpressionExecutableScript(compiledScript, vars);
assertEquals((Double) ees.run(), 4.5, 0.001);
ees.setNextVar("b", -2.5);
assertEquals((Double) ees.run(), -1, 0.001);
ees.setNextVar("a", -2.5);
ees.setNextVar("b", -2.5);
ees.setNextVar("xyz", -2.5);
assertEquals((Double) ees.run(), -7.5, 0.001);
String message;
try {
vars = new HashMap<>();
vars.put("a", 1);
ees = new ExpressionExecutableScript(compiledScript, vars);
ees.run();
fail("An incorrect number of variables were allowed to be used in an expression.");
} catch (ScriptException se) {
message = se.getMessage();
assertThat(
message + " should have contained number of variables",
message.contains("number of variables"),
equalTo(true));
}
try {
vars = new HashMap<>();
vars.put("a", 1);
vars.put("b", 3);
vars.put("c", -1);
ees = new ExpressionExecutableScript(compiledScript, vars);
ees.run();
fail("A variable was allowed to be set that does not exist in the expression.");
} catch (ScriptException se) {
message = se.getMessage();
assertThat(
message + " should have contained does not exist in",
message.contains("does not exist in"),
equalTo(true));
}
try {
vars = new HashMap<>();
vars.put("a", 1);
vars.put("b", 3);
vars.put("xyz", "hello");
ees = new ExpressionExecutableScript(compiledScript, vars);
ees.run();
fail("A non-number was allowed to be use in the expression.");
} catch (ScriptException se) {
message = se.getMessage();
assertThat(
message + " should have contained process numbers",
message.contains("process numbers"),
equalTo(true));
}
}