svn-gvsig-desktop / 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 @ 45308
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2020 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.expressionevaluator.impl.function.dataaccess; |
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import java.util.ArrayList; |
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import java.util.HashSet; |
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import java.util.List; |
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import java.util.Objects; |
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import java.util.Set; |
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import org.apache.commons.lang3.Range; |
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import org.apache.commons.lang3.StringUtils; |
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import org.apache.commons.lang3.tuple.ImmutablePair; |
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import org.apache.commons.lang3.tuple.Pair; |
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import org.gvsig.expressionevaluator.Code; |
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import org.gvsig.expressionevaluator.CodeBuilder; |
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import org.gvsig.expressionevaluator.Codes; |
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import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_GETATTR; |
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import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_TUPLE; |
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import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
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import org.gvsig.expressionevaluator.ExpressionUtils; |
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import org.gvsig.expressionevaluator.Interpreter; |
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import org.gvsig.expressionevaluator.Optimizer; |
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import org.gvsig.expressionevaluator.SymbolTable; |
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import org.gvsig.expressionevaluator.impl.DALFunctions; |
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import org.gvsig.fmap.dal.DALLocator; |
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import org.gvsig.fmap.dal.DataManager; |
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import static org.gvsig.fmap.dal.DataManager.FUNCTION_SELECT; |
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import org.gvsig.fmap.dal.DataStore; |
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import org.gvsig.fmap.dal.expressionevaluator.ExpressionEvaluator; |
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import static org.gvsig.fmap.dal.expressionevaluator.FeatureSymbolTable.SYMBOL_CURRENT_TABLE; |
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import org.gvsig.fmap.dal.expressionevaluator.TableAttributeHandler; |
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import org.gvsig.fmap.dal.feature.Feature; |
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import org.gvsig.fmap.dal.feature.FeatureQuery; |
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import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
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import org.gvsig.fmap.dal.feature.FeatureStore; |
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import org.gvsig.fmap.dal.impl.expressionevaluator.DefaultExpressionEvaluator; |
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import org.gvsig.expressionevaluator.Code.Callable; |
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import org.gvsig.expressionevaluator.spi.AbstractFunction; |
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import org.gvsig.fmap.dal.feature.impl.DefaultFeatureQueryOrder; |
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/**
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*
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* @author jjdelcerro
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*/
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@SuppressWarnings("UseSpecificCatch") |
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public class SelectFunction |
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extends AbstractFunction
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implements Optimizer.FunctionOptimizer
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{ |
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public SelectFunction() {
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super(DALFunctions.GROUP_DATA_ACCESS,
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FUNCTION_SELECT, |
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Range.is(6),
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"Returns a list of features of the table by applying the filter, order and limit indicated.\n"+
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"The syntax is:\n\n"+
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"SELECT * FROM table WHERE boolean_expression ORDER BY order_column LIMIT limit;\n\n"+
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"Indicate a filter expression with WHERE, an order or LIMIT is optional.\n"+
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"You can use an asterisk or enter the column names you want to retrieve separated by commas.\n"+
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"The SELECT statement must always end with a semicolon.",
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"SELECT * FROM table WHERE boolean_expression ORDER BY order_column LIMIT limit;",
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new String[]{ |
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"column_names/asterisk - Names of the columns table to retrieve.",
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"table_name - Name of the table",
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"filter - boolean expression to apply as filter",
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"order_column - the order used to retrieve the features. It is a list of column names separated by a comma. The column name can optionally be followed by ASC or DESC to indicate whether the order should be ascending or descending.",
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"limit - Maximum number of features to return"
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}, |
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"List",
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true
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); |
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} |
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@Override
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public boolean isHidden() { |
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return false; |
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} |
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@Override
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public boolean allowConstantFolding() { |
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return false; |
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} |
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@Override
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public boolean useArgumentsInsteadObjects() { |
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return true; |
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} |
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@Override
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public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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throw new UnsupportedOperationException(); |
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} |
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private static final int COLUMNS = 0; |
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private static final int TABLE = 1; |
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private static final int WHERE = 2; |
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private static final int ORDER = 3; |
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private static final int ORDER_MODE = 4; |
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private static final int LIMIT = 5; |
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private Callable getTupleOrNull(Codes args, int argn) { |
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Code code = args.get(argn); |
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if( code.code()==Code.CONSTANT ) {
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if( ((Code.Constant)code).value()!=null ) { |
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throw new ExpressionRuntimeException("Tupple or null expected in argument "+argn+ " of function '" + FUNCTION_SELECT + "'."); |
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} |
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return null; |
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} |
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if( code.code()!=Code.CALLABLE ) {
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throw new ExpressionRuntimeException("Tupple or null expected in argument "+argn+ " of function '" + FUNCTION_SELECT + "'."); |
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} |
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Callable caller = (Callable) code; |
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if( !StringUtils.equalsIgnoreCase(FUNCTION_TUPLE, caller.name()) ) {
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throw new ExpressionRuntimeException("Tupple or null expected in argument "+argn+ " of function '" + FUNCTION_SELECT + "'."); |
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} |
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return caller;
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} |
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@Override
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public Object call(Interpreter interpreter, Codes args) throws Exception { |
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Code.Identifier storeName = (Code.Identifier) args.get(TABLE); |
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Code columns = getTupleOrNull(args, COLUMNS); |
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Code where = args.get(WHERE); |
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if( where.code()==Code.CONSTANT ) {
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if( ((Code.Constant)where).value()==null ) { |
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where = null;
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} |
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} |
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Number limit = (Number) getObject(interpreter, args, LIMIT); |
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Callable order = getTupleOrNull(args, ORDER);
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Callable order_mode = getTupleOrNull(args, ORDER_MODE);
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FeatureQueryOrder queryOrder = null;
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if( order!=null || order_mode!=null ) { |
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for( int n=0 ; n<order.parameters().size(); n++) { |
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String member = (String) interpreter.run(order.parameters().get(n)); |
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Boolean mode = (Boolean) interpreter.run(order_mode.parameters().get(n)); |
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if( queryOrder == null ) { |
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queryOrder = new DefaultFeatureQueryOrder();
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} |
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queryOrder.add(member, mode); |
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} |
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} |
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// FIXME: add columns to query.addAttributeName()
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try {
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DataStore store = this.getStore(storeName.name());
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if (store == null ) { |
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throw new ExpressionRuntimeException("Cant locate the store '" + storeName + "' in function '" + FUNCTION_SELECT + "'."); |
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} |
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if (!(store instanceof FeatureStore)) { |
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throw new ExpressionRuntimeException("The store'" + storeName + "' is not valid for function '" + FUNCTION_SELECT + "', a FeatureStore is required."); |
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} |
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FeatureStore featureStore = (FeatureStore) store; |
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List<Feature> features;
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if (where == null && queryOrder == null && limit==null ) { |
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features = featureStore.getFeatures(); |
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} else {
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FeatureQuery query = featureStore.createFeatureQuery(); |
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if (where != null) { |
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Code where2 = removeOuterTablesReferences(interpreter, where); |
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ExpressionEvaluator filter = new DefaultExpressionEvaluator(where2.toString());
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filter.getSymbolTable().addSymbolTable(interpreter.getSymbolTable()); |
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query.addFilter(filter); |
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} |
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if (queryOrder != null) { |
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query.getOrder().copyFrom(queryOrder); |
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} |
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if( limit!=null ) { |
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query.setLimit(limit.longValue()); |
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} |
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query.retrievesAllAttributes(); |
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features = featureStore.getFeatures(query); |
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} |
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return features;
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} catch (ExpressionRuntimeException ex) {
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throw ex;
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} catch (Exception ex) { |
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throw new ExpressionRuntimeException("Problems calling '" + FUNCTION_SELECT + "' function", ex); |
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} |
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} |
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protected DataStore getStore(String storeName) { |
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DataManager dataManager = DALLocator.getDataManager(); |
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DataStore store = dataManager.getStoresRepository().getStore(storeName); |
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return store;
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} |
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public static Code removeOuterTablesReferences(Interpreter interpreter, Code where) { |
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try {
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SymbolTable symbolTable = interpreter.getSymbolTable(); |
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TableAttributeHandler table = (TableAttributeHandler) symbolTable.value(SYMBOL_CURRENT_TABLE); |
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List<Pair<Code,Code>>replaces = new ArrayList<>(); |
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CodeBuilder codeBuilder = ExpressionUtils.createCodeBuilder(); |
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final Set<Code> replacesToASkip = new HashSet<>(); |
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Code where2 = where.clone(); |
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where2.accept((Object o) -> {
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if( o == null ) { |
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return;
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} |
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Code code = (Code) o; |
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switch(code.code()) {
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case Code.CALLABLE:
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Code.Callable caller = (Code.Callable) code; |
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if( StringUtils.equalsIgnoreCase(caller.name(),FUNCTION_GETATTR) ) {
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Codes args = caller.parameters(); |
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Code arg0 = args.get(0);
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Code arg1 = args.get(1);
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replacesToASkip.add(arg1); |
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if( arg0 instanceof Code.Identifier && arg1 instanceof Code.Constant ) { |
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Object tt = symbolTable.value(((Code.Identifier)arg0).name());
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if( tt instanceof TableAttributeHandler && |
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StringUtils.equalsIgnoreCase(((TableAttributeHandler)tt).getName(), table.getName()) ) { |
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String columnName = Objects.toString(((Code.Constant)arg1).value(), null); |
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if( columnName!=null ) { |
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Object value = table.get(columnName);
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replaces.add( |
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new ImmutablePair<>(
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caller, |
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codeBuilder.constant(value) |
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) |
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); |
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} |
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} |
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} |
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} |
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break;
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} |
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}); |
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where2.accept((Object o) -> {
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if( o == null ) { |
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return;
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} |
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Code code = (Code) o; |
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if( replacesToASkip.contains(code) ) {
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return;
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} |
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switch(code.code()) {
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case Code.IDENTIFIER:
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Code.Identifier id = (Code.Identifier)code; |
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if( symbolTable.exists(id.name()) ) {
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Object value = symbolTable.value(id.name());
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replaces.add( |
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new ImmutablePair<>(
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id, |
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codeBuilder.constant(value) |
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) |
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); |
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} |
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break;
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} |
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}); |
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if( replaces.isEmpty() ) {
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return where;
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} |
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for (Pair<Code, Code> replace : replaces) {
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if( replace!=null ) { |
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where2.replace(replace.getLeft(), replace.getRight()); |
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} |
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} |
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return where2;
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} catch (Exception ex) { |
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throw new ExpressionRuntimeException("Can't remove references to outer tables.", ex); |
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} |
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} |
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@Override
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public Code optimize(Optimizer optimizer, Callable caller) { |
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return caller; // Don't optimize SELECT |
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} |
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} |