Examples with LogicalExpression org.apache.atlas.groovy.LogicalExpression used on opensource projects

Example 1 with LogicalExpression

use of org.apache.atlas.groovy.LogicalExpression in project incubator-atlas by apache.

the class Gremlin3ExpressionFactory method generateHasExpression.

@Override
public GroovyExpression generateHasExpression(GraphPersistenceStrategies s, GroovyExpression parent, String propertyName, String symbol, GroovyExpression requiredValue, FieldInfo fInfo) throws AtlasException {
    AttributeInfo attrInfo = fInfo.attrInfo();
    IDataType attrType = attrInfo.dataType();
    GroovyExpression propertNameExpr = new LiteralExpression(propertyName);
    if (s.isPropertyValueConversionNeeded(attrType)) {
        // for some types, the logical value cannot be stored directly in
        // the underlying graph,
        // and conversion logic is needed to convert the persistent form of
        // the value
        // to the actual value. In cases like this, we generate a conversion
        // expression to
        // do this conversion and use the filter step to perform the
        // comparsion in the gremlin query
        GroovyExpression itExpr = getItVariable();
        GroovyExpression vertexExpr = new CastExpression(new FunctionCallExpression(itExpr, GET_METHOD), VERTEX_CLASS);
        GroovyExpression propertyValueExpr = new FunctionCallExpression(vertexExpr, VALUE_METHOD, propertNameExpr);
        GroovyExpression conversionExpr = s.generatePersisentToLogicalConversionExpression(propertyValueExpr, attrType);
        GroovyExpression propertyIsPresentExpression = new FunctionCallExpression(new FunctionCallExpression(vertexExpr, PROPERTY_METHOD, propertNameExpr), IS_PRESENT_METHOD);
        GroovyExpression valueMatchesExpr = new ComparisonExpression(conversionExpr, getGroovyOperator(symbol), requiredValue);
        GroovyExpression filterCondition = new LogicalExpression(propertyIsPresentExpression, LogicalOperator.AND, valueMatchesExpr);
        GroovyExpression filterFunction = new ClosureExpression(filterCondition);
        return new FunctionCallExpression(TraversalStepType.FILTER, parent, FILTER_METHOD, filterFunction);
    } else {
        GroovyExpression valueMatches = new FunctionCallExpression(getComparisonFunction(symbol), requiredValue);
        return new FunctionCallExpression(TraversalStepType.FILTER, parent, HAS_METHOD, propertNameExpr, valueMatches);
    }
}

Example 2 with LogicalExpression

use of org.apache.atlas.groovy.LogicalExpression in project incubator-atlas by apache.

the class Gremlin2ExpressionFactory method typeTestExpression.

@Override
public GroovyExpression typeTestExpression(GraphPersistenceStrategies s, String typeName, GroovyExpression itRef) {
    GroovyExpression superTypeAttrExpr = new FieldExpression(itRef, s.superTypeAttributeName());
    GroovyExpression typeNameExpr = new LiteralExpression(typeName);
    GroovyExpression isSuperTypeExpr = new FunctionCallExpression(superTypeAttrExpr, CONTAINS, typeNameExpr);
    GroovyExpression superTypeMatchesExpr = new TernaryOperatorExpression(superTypeAttrExpr, isSuperTypeExpr, LiteralExpression.FALSE);
    GroovyExpression typeAttrExpr = new FieldExpression(itRef, s.typeAttributeName());
    GroovyExpression typeMatchesExpr = new ComparisonExpression(typeAttrExpr, ComparisonOperator.EQUALS, typeNameExpr);
    return new LogicalExpression(typeMatchesExpr, LogicalOperator.OR, superTypeMatchesExpr);
}