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 / AbstractSelectFunction.java @ 47777
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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.Code.Callable; |
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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_$HOSTEXPRESSION; |
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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.SymbolTable; |
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import org.gvsig.expressionevaluator.spi.AbstractFunction; |
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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 org.gvsig.fmap.dal.DataStore; |
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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.FeatureStore; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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/**
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*
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* @author gvSIG Team
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*/
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@SuppressWarnings("UseSpecificCatch") |
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public abstract class AbstractSelectFunction extends AbstractFunction { |
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protected AbstractSelectFunction(String group, String name, Range argc, String description, String template, String[] descriptionArgs, String returnType, boolean sqlCompatible) { |
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super(group, name, argc, description, template, descriptionArgs, returnType, sqlCompatible);
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} |
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protected AbstractSelectFunction(String group, String name, Range argc, String description, String template, String[] descriptionArgs, String returnType) { |
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super(group, name, argc, description, template, descriptionArgs, returnType);
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} |
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protected String getIdentifier(Codes args, int argn) { |
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Code id_code = (Code) args.get(argn); |
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if( id_code == null ) { |
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return null; |
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} |
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if (id_code instanceof Code.Identifier) { |
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return ((Code.Identifier) id_code).name();
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} else if (id_code instanceof Code.Constant) { |
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Code.Constant storeName_const = (Code.Constant) id_code; |
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if (storeName_const.value() instanceof CharSequence) { |
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return storeName_const.value().toString();
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} |
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} |
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throw new ExpressionRuntimeException("Invalid identifier (" + Objects.toString(id_code) + ") in function '" + this.name() + "'."); |
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} |
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protected Code getWhereCode(Codes args, int argn) { |
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Code where = args.get(argn); |
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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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return where;
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} |
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protected 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 '" + this.name() + "'."); |
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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 '" + this.name() + "'."); |
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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 '" + this.name() + "'."); |
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} |
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return caller;
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} |
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protected Code removeOuterTablesReferences(Interpreter interpreter, Code where, FeatureType currentType) {
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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 (currentType.getAttributeDescriptor(id.name()) == null && 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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protected Code replaceLocalVariables(Interpreter interpreter, Code expression, FeatureType currentType) {
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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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Code expression2 = expression.clone(); |
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expression2.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.IDENTIFIER:
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Code.Identifier id = (Code.Identifier) code; |
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if (currentType.getAttributeDescriptor(id.name()) == null && 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 expression;
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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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expression2.replace(replace.getLeft(), replace.getRight()); |
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} |
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} |
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return expression2;
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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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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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protected FeatureStore getFeatureStore(String storeName) { |
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DataManager dataManager = DALLocator.getDataManager(); |
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DataStore store = dataManager.getStoresRepository().getStore(storeName); |
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if (store instanceof FeatureStore) { |
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return (FeatureStore) store;
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} |
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return null; |
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} |
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protected boolean isHostExpression(Code code) { |
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if( code.code()!=Code.CALLABLE ) {
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return false; |
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} |
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return StringUtils.equalsIgnoreCase(FUNCTION_$HOSTEXPRESSION, ((Callable)code).name()); |
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} |
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} |