Revision 44750 trunk/org.gvsig.desktop/org.gvsig.desktop.compat.cdc/org.gvsig.fmap.dal/org.gvsig.fmap.dal.impl/src/main/java/org/gvsig/expressionevaluator/impl/function/dataaccess/SelectFunction.java
| SelectFunction.java | ||
|---|---|---|
| 23 | 23 |
*/ |
| 24 | 24 |
package org.gvsig.expressionevaluator.impl.function.dataaccess; |
| 25 | 25 |
|
| 26 |
import java.util.ArrayList; |
|
| 26 | 27 |
import java.util.List; |
| 27 | 28 |
import java.util.Objects; |
| 28 | 29 |
import org.apache.commons.lang3.Range; |
| 30 |
import org.apache.commons.lang3.StringUtils; |
|
| 31 |
import org.apache.commons.lang3.tuple.ImmutablePair; |
|
| 32 |
import org.apache.commons.lang3.tuple.Pair; |
|
| 33 |
import org.gvsig.expressionevaluator.Code; |
|
| 34 |
import org.gvsig.expressionevaluator.Code.Caller; |
|
| 35 |
import org.gvsig.expressionevaluator.CodeBuilder; |
|
| 29 | 36 |
import org.gvsig.expressionevaluator.Codes; |
| 30 |
import org.gvsig.expressionevaluator.Expression; |
|
| 37 |
import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_GETATTR; |
|
| 38 |
import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_TUPLE; |
|
| 31 | 39 |
import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
| 32 | 40 |
import org.gvsig.expressionevaluator.ExpressionUtils; |
| 33 | 41 |
import org.gvsig.expressionevaluator.Interpreter; |
| 42 |
import org.gvsig.expressionevaluator.Optimizer; |
|
| 43 |
import org.gvsig.expressionevaluator.SymbolTable; |
|
| 34 | 44 |
import org.gvsig.expressionevaluator.impl.DALFunctions; |
| 35 | 45 |
import org.gvsig.expressionevaluator.spi.AbstractFunction; |
| 36 | 46 |
import org.gvsig.fmap.dal.DALLocator; |
| 37 | 47 |
import org.gvsig.fmap.dal.DataManager; |
| 38 | 48 |
import static org.gvsig.fmap.dal.DataManager.FUNCTION_SELECT; |
| 39 | 49 |
import org.gvsig.fmap.dal.DataStore; |
| 50 |
import org.gvsig.fmap.dal.expressionevaluator.ExpressionEvaluator; |
|
| 51 |
import static org.gvsig.fmap.dal.expressionevaluator.FeatureSymbolTable.SYMBOL_CURRENT_TABLE; |
|
| 52 |
import org.gvsig.fmap.dal.expressionevaluator.TableAttributeHandler; |
|
| 40 | 53 |
import org.gvsig.fmap.dal.feature.Feature; |
| 41 | 54 |
import org.gvsig.fmap.dal.feature.FeatureQuery; |
| 42 | 55 |
import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
| 43 | 56 |
import org.gvsig.fmap.dal.feature.FeatureStore; |
| 57 |
import org.gvsig.fmap.dal.impl.expressionevaluator.DefaultExpressionEvaluator; |
|
| 58 |
import org.gvsig.tools.exception.BaseException; |
|
| 44 | 59 |
|
| 45 | 60 |
/** |
| 46 | 61 |
* |
| 47 | 62 |
* @author jjdelcerro |
| 48 | 63 |
*/ |
| 49 |
public class SelectFunction extends AbstractFunction {
|
|
| 64 |
public class SelectFunction |
|
| 65 |
extends AbstractFunction |
|
| 66 |
implements Optimizer.FunctionOptimizer |
|
| 67 |
{
|
|
| 50 | 68 |
|
| 51 | 69 |
public SelectFunction() {
|
| 52 | 70 |
super(DALFunctions.GROUP_DATA_ACCESS, |
| 53 | 71 |
FUNCTION_SELECT, |
| 54 |
Range.between(1,5),
|
|
| 72 |
Range.is(6),
|
|
| 55 | 73 |
"Returns a list of features of the table by applying the filter, order and limit indicated.\n"+ |
| 56 | 74 |
"The syntax is:\n\n"+ |
| 57 | 75 |
"SELECT * FROM table WHERE boolean_expression ORDER BY order_column LIMIT limit;\n\n"+ |
| ... | ... | |
| 65 | 83 |
"limit - Maximum number of features to return" |
| 66 | 84 |
}, |
| 67 | 85 |
"List", |
| 68 |
false
|
|
| 86 |
true
|
|
| 69 | 87 |
); |
| 70 | 88 |
} |
| 71 | 89 |
|
| ... | ... | |
| 80 | 98 |
} |
| 81 | 99 |
|
| 82 | 100 |
@Override |
| 83 |
public boolean allowArgNames() {
|
|
| 84 |
return true; |
|
| 85 |
} |
|
| 86 |
|
|
| 87 |
@Override |
|
| 88 | 101 |
public boolean useArgumentsInsteadObjects() {
|
| 89 | 102 |
return true; |
| 90 | 103 |
} |
| ... | ... | |
| 94 | 107 |
throw new UnsupportedOperationException(); |
| 95 | 108 |
} |
| 96 | 109 |
|
| 110 |
private static final int COLUMNS = 0; |
|
| 111 |
private static final int TABLE = 1; |
|
| 112 |
private static final int WHERE = 2; |
|
| 113 |
private static final int ORDER = 3; |
|
| 114 |
private static final int ORDER_MODE = 4; |
|
| 115 |
private static final int LIMIT = 5; |
|
| 116 |
|
|
| 117 |
|
|
| 118 |
private Caller getTupleOrNull(Codes args, int argn) {
|
|
| 119 |
Code code = args.get(argn); |
|
| 120 |
if( code.code()==Code.CONSTANT ) {
|
|
| 121 |
if( ((Code.Constant)code).value()!=null ) {
|
|
| 122 |
throw new ExpressionRuntimeException("Tupple or null expected in argument "+argn+ " of function '" + FUNCTION_SELECT + "'.");
|
|
| 123 |
} |
|
| 124 |
return null; |
|
| 125 |
} |
|
| 126 |
if( code.code()!=Code.CALLER ) {
|
|
| 127 |
throw new ExpressionRuntimeException("Tupple or null expected in argument "+argn+ " of function '" + FUNCTION_SELECT + "'.");
|
|
| 128 |
} |
|
| 129 |
Caller caller = (Caller) code; |
|
| 130 |
if( !StringUtils.equalsIgnoreCase(FUNCTION_TUPLE, caller.name()) ) {
|
|
| 131 |
throw new ExpressionRuntimeException("Tupple or null expected in argument "+argn+ " of function '" + FUNCTION_SELECT + "'.");
|
|
| 132 |
} |
|
| 133 |
return caller; |
|
| 134 |
} |
|
| 135 |
|
|
| 97 | 136 |
@Override |
| 98 | 137 |
public Object call(Interpreter interpreter, Codes args) throws Exception {
|
| 99 | 138 |
|
| 100 |
String storeName = (String) getObject(interpreter, args, "TABLE"); |
|
| 101 |
String where = Objects.toString(args.get("WHERE"),null);
|
|
| 102 |
Number limit = (Number) getObject(interpreter, args, "LIMIT"); |
|
| 103 |
FeatureQueryOrder order = null; |
|
| 104 |
for( int n=0 ; args.contains("ORDER", n); n++) {
|
|
| 105 |
String member = (String) getObject(interpreter, args, "ORDER", n); |
|
| 106 |
Boolean mode = (Boolean) getObject(interpreter, args, "ORDER_MODE", n); |
|
| 107 |
if( order == null ) {
|
|
| 108 |
order = new FeatureQueryOrder(); |
|
| 139 |
Code.Identifier storeName = (Code.Identifier) args.get(TABLE); |
|
| 140 |
Code columns = getTupleOrNull(args, COLUMNS); |
|
| 141 |
Code where = args.get(WHERE); |
|
| 142 |
Number limit = (Number) getObject(interpreter, args, LIMIT); |
|
| 143 |
Caller order = getTupleOrNull(args, ORDER); |
|
| 144 |
Caller order_mode = getTupleOrNull(args, ORDER_MODE); |
|
| 145 |
|
|
| 146 |
FeatureQueryOrder queryOrder = null; |
|
| 147 |
if( order!=null || order_mode!=null ) {
|
|
| 148 |
for( int n=0 ; n<order.parameters().size(); n++) {
|
|
| 149 |
String member = (String) interpreter.run(order.parameters().get(n)); |
|
| 150 |
Boolean mode = (Boolean) interpreter.run(order_mode.parameters().get(n)); |
|
| 151 |
if( queryOrder == null ) {
|
|
| 152 |
queryOrder = new FeatureQueryOrder(); |
|
| 153 |
} |
|
| 154 |
queryOrder.add(member, mode); |
|
| 109 | 155 |
} |
| 110 |
order.add(member, mode); |
|
| 111 | 156 |
} |
| 112 |
|
|
| 157 |
// FIXME: add columns to query.addAttributeName() |
|
| 113 | 158 |
try {
|
| 114 |
DataStore store = this.getStore(storeName); |
|
| 159 |
DataStore store = this.getStore(storeName.name());
|
|
| 115 | 160 |
if (store == null ) {
|
| 116 | 161 |
throw new ExpressionRuntimeException("Cant locate the store '" + storeName + "' in function '" + FUNCTION_SELECT + "'.");
|
| 117 | 162 |
} |
| ... | ... | |
| 120 | 165 |
} |
| 121 | 166 |
FeatureStore featureStore = (FeatureStore) store; |
| 122 | 167 |
List<Feature> features; |
| 123 |
if (where == null && order == null && limit==null ) {
|
|
| 168 |
if (where == null && queryOrder == null && limit==null ) {
|
|
| 124 | 169 |
features = featureStore.getFeatures(); |
| 125 | 170 |
} else {
|
| 126 | 171 |
FeatureQuery query = featureStore.createFeatureQuery(); |
| 127 | 172 |
if (where != null) {
|
| 128 |
Expression filter = ExpressionUtils.createExpression(where); |
|
| 173 |
removeOuterTablesReferences(interpreter, where); |
|
| 174 |
ExpressionEvaluator filter = new DefaultExpressionEvaluator(where.toString()); |
|
| 129 | 175 |
filter.getSymbolTable().addSymbolTable(interpreter.getSymbolTable()); |
| 130 | 176 |
query.addFilter(filter); |
| 131 | 177 |
} |
| 132 |
if (order != null) {
|
|
| 133 |
query.getOrder().copyFrom(order);
|
|
| 178 |
if (queryOrder != null) {
|
|
| 179 |
query.getOrder().copyFrom(queryOrder);
|
|
| 134 | 180 |
} |
| 135 | 181 |
if( limit!=null ) {
|
| 136 | 182 |
query.setLimit(limit.longValue()); |
| ... | ... | |
| 152 | 198 |
return store; |
| 153 | 199 |
} |
| 154 | 200 |
|
| 201 |
private void removeOuterTablesReferences(Interpreter interpreter, Code where) {
|
|
| 202 |
try {
|
|
| 203 |
SymbolTable symbolTable = interpreter.getSymbolTable(); |
|
| 204 |
TableAttributeHandler table = (TableAttributeHandler) symbolTable.value(SYMBOL_CURRENT_TABLE); |
|
| 205 |
List<Pair<Code,Code>>replaces = new ArrayList<>(); |
|
| 206 |
CodeBuilder codeBuilder = ExpressionUtils.createCodeBuilder(); |
|
| 207 |
where.accept((Object o) -> {
|
|
| 208 |
Code code = (Code) o; |
|
| 209 |
if( code!=null && code.code() == Code.CALLER ) {
|
|
| 210 |
Code.Caller caller = (Code.Caller) code; |
|
| 211 |
if( StringUtils.equalsIgnoreCase(caller.name(),FUNCTION_GETATTR) ) {
|
|
| 212 |
Codes args = caller.parameters(); |
|
| 213 |
Code arg0 = args.get(0); |
|
| 214 |
Code arg1 = args.get(1); |
|
| 215 |
if( arg0 instanceof Code.Identifier && arg1 instanceof Code.Identifier ) {
|
|
| 216 |
Object tt = symbolTable.value(((Code.Identifier)arg0).name()); |
|
| 217 |
if( tt instanceof TableAttributeHandler && |
|
| 218 |
StringUtils.equalsIgnoreCase(((TableAttributeHandler)tt).getName(), table.getName()) ) {
|
|
| 219 |
String columnName = Objects.toString(((Code.Identifier)arg1).name(), null); |
|
| 220 |
if( columnName!=null ) {
|
|
| 221 |
Object value = table.get(columnName); |
|
| 222 |
replaces.add( |
|
| 223 |
new ImmutablePair<>( |
|
| 224 |
caller, |
|
| 225 |
codeBuilder.constant(value) |
|
| 226 |
) |
|
| 227 |
); |
|
| 228 |
} |
|
| 229 |
} |
|
| 230 |
} |
|
| 231 |
} |
|
| 232 |
} |
|
| 233 |
}); |
|
| 234 |
for (Pair<Code, Code> replace : replaces) {
|
|
| 235 |
if( replace!=null ) {
|
|
| 236 |
where.replace(replace.getLeft(), replace.getRight()); |
|
| 237 |
} |
|
| 238 |
} |
|
| 239 |
} catch (BaseException ex) {
|
|
| 240 |
throw new ExpressionRuntimeException("Can't remove references to outer tables.", ex);
|
|
| 241 |
} |
|
| 242 |
|
|
| 243 |
} |
|
| 244 |
|
|
| 245 |
@Override |
|
| 246 |
public Code optimize(Optimizer optimizer, Caller caller) {
|
|
| 247 |
return caller; // Don't optimize SELECT |
|
| 248 |
} |
|
| 249 |
|
|
| 155 | 250 |
} |
Also available in: Unified diff