private Path<?> getPath(Expression<?> leftHandSide) {
if (leftHandSide instanceof Path<?>) {
return (Path<?>) leftHandSide;
} else if (leftHandSide instanceof Operation<?>) {
Operation<?> operation = (Operation<?>) leftHandSide;
if (operation.getOperator() == Ops.LOWER || operation.getOperator() == Ops.UPPER) {
return (Path<?>) operation.getArg(0);
}
}
throw new IllegalArgumentException("Unable to transform " + leftHandSide + " to path");
}
private Query toQuery(Operation<?> operation, QueryMetadata metadata) {
Operator op = operation.getOperator();
if (op == Ops.OR) {
return toTwoHandSidedQuery(operation, Occur.SHOULD, metadata);
} else if (op == Ops.AND) {
return toTwoHandSidedQuery(operation, Occur.MUST, metadata);
} else if (op == Ops.NOT) {
BooleanQuery bq = new BooleanQuery();
bq.add(new BooleanClause(toQuery(operation.getArg(0), metadata), Occur.MUST_NOT));
bq.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
return bq;
} else if (op == Ops.LIKE) {
return like(operation, metadata);
} else if (op == Ops.LIKE_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.EQ) {
return eq(operation, metadata, false);
} else if (op == Ops.EQ_IGNORE_CASE) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.NE) {
return ne(operation, metadata, false);
} else if (op == Ops.STARTS_WITH) {
return startsWith(metadata, operation, false);
} else if (op == Ops.STARTS_WITH_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.ENDS_WITH) {
return endsWith(operation, metadata, false);
} else if (op == Ops.ENDS_WITH_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.STRING_CONTAINS) {
return stringContains(operation, metadata, false);
} else if (op == Ops.STRING_CONTAINS_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.BETWEEN) {
return between(operation, metadata);
} else if (op == Ops.IN) {
return in(operation, metadata, false);
} else if (op == Ops.NOT_IN) {
return notIn(operation, metadata, false);
} else if (op == Ops.LT) {
return lt(operation, metadata);
} else if (op == Ops.GT) {
return gt(operation, metadata);
} else if (op == Ops.LOE) {
return le(operation, metadata);
} else if (op == Ops.GOE) {
return ge(operation, metadata);
} else if (op == LuceneOps.LUCENE_QUERY) {
@SuppressWarnings("unchecked") // This is the expected type
Query rv = ((Constant<Query>) operation.getArg(0)).getConstant();
return rv;
}
throw new UnsupportedOperationException("Illegal operation " + operation);
}
/**
* template method
*
* @param leftHandSide left hand side
* @param rightHandSide right hand side
* @return results
*/
protected String[] convert(
Path<?> leftHandSide, Expression<?> rightHandSide, QueryMetadata metadata) {
if (rightHandSide instanceof Operation) {
Operation<?> operation = (Operation<?>) rightHandSide;
if (operation.getOperator() == LuceneOps.PHRASE) {
return Iterables.toArray(WS_SPLITTER.split(operation.getArg(0).toString()), String.class);
} else if (operation.getOperator() == LuceneOps.TERM) {
return new String[] {operation.getArg(0).toString()};
} else {
throw new IllegalArgumentException(rightHandSide.toString());
}
} else if (rightHandSide instanceof ParamExpression<?>) {
Object value = metadata.getParams().get(rightHandSide);
if (value == null) {
throw new ParamNotSetException((ParamExpression<?>) rightHandSide);
}
return convert(leftHandSide, value);
} else if (rightHandSide instanceof Constant<?>) {
return convert(leftHandSide, ((Constant<?>) rightHandSide).getConstant());
} else {
throw new IllegalArgumentException(rightHandSide.toString());
}
}