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expression parser

This commit is contained in:
Michele Artini 2023-03-20 15:32:46 +01:00
parent ab3c0851ed
commit 28598ddfea
2 changed files with 66 additions and 2 deletions
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14
libs/dnet-wf-service/src/main/java/eu/dnetlib/manager/wf/workflows/graph/GraphLoader.java
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@ -6,7 +6,11 @@ import java.util.Set;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.expression.MapAccessor;
import org.springframework.core.env.Environment;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.stereotype.Service;
import com.google.common.base.Function;
@ -64,8 +68,14 @@ public class GraphLoader {
}
private Function<Env, Boolean> generateFunction(final String condition) {
// TODO Auto-generated method stub
return null;
return env -> {
final ExpressionParser parser = new SpelExpressionParser();
final StandardEvaluationContext context = new StandardEvaluationContext(env.getAttributes());
context.addPropertyAccessor(new MapAccessor());
return parser.parseExpression(condition).getValue(context, Boolean.class);
};
}
private void checkValidity(final Graph graph) throws WorkflowManagerException {

54
libs/dnet-wf-service/src/test/java/eu/dnetlib/manager/wf/workflows/graph/GraphLoaderTest.java Normal file
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@ -0,0 +1,54 @@
package eu.dnetlib.manager.wf.workflows.graph;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.function.Function;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.context.expression.MapAccessor;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import eu.dnetlib.manager.wf.workflows.procs.Env;
public class GraphLoaderTest {
private Env env;
@BeforeEach
void setUp() throws Exception {
env = new Env();
env.setAttribute("author", "Michele Artini");
env.setAttribute("age", 47);
}
@Test
final void testExpressions() {
assertTrue(evalFunction("age == 47").apply(env));
assertTrue(evalFunction("age > 40").apply(env));
assertTrue(evalFunction("author == 'Michele Artini'").apply(env));
assertTrue(evalFunction("age == 47 && author == 'Michele Artini'").apply(env));
assertTrue(evalFunction("age == 47 || author == 'Michele Artini'").apply(env));
assertTrue(evalFunction("age == 47 || author == 'Claudio Atzori'").apply(env));
assertTrue(evalFunction("age == 22 || author == 'Michele Artini'").apply(env));
assertFalse(evalFunction("age != 47").apply(env));
assertFalse(evalFunction("age < 40").apply(env));
assertFalse(evalFunction("author != 'Michele Artini'").apply(env));
assertFalse(evalFunction("age == 47 && author == 'Claudio Atzori'").apply(env));
}
private Function<Env, Boolean> evalFunction(final String f) {
return env -> {
final ExpressionParser parser = new SpelExpressionParser();
final StandardEvaluationContext context = new StandardEvaluationContext(env.getAttributes());
context.addPropertyAccessor(new MapAccessor());
return parser.parseExpression(f).getValue(context, Boolean.class);
};
}
}