/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.commons.query.sql2;
import java.util.BitSet;
import java.util.Arrays;
import javax.jcr.query.qom.QueryObjectModel;
import javax.jcr.query.qom.Join;
import javax.jcr.query.qom.Source;
import javax.jcr.query.qom.Selector;
import javax.jcr.query.qom.Column;
import javax.jcr.query.qom.Constraint;
import javax.jcr.query.qom.Ordering;
import javax.jcr.query.qom.JoinCondition;
import javax.jcr.query.qom.EquiJoinCondition;
import javax.jcr.query.qom.ChildNodeJoinCondition;
import javax.jcr.query.qom.DescendantNodeJoinCondition;
import javax.jcr.query.qom.SameNodeJoinCondition;
import javax.jcr.query.qom.And;
import javax.jcr.query.qom.ChildNode;
import javax.jcr.query.qom.Comparison;
import javax.jcr.query.qom.DescendantNode;
import javax.jcr.query.qom.FullTextSearch;
import javax.jcr.query.qom.Not;
import javax.jcr.query.qom.Or;
import javax.jcr.query.qom.PropertyExistence;
import javax.jcr.query.qom.SameNode;
import javax.jcr.query.qom.DynamicOperand;
import javax.jcr.query.qom.StaticOperand;
import javax.jcr.query.qom.BindVariableValue;
import javax.jcr.query.qom.Literal;
import javax.jcr.query.qom.FullTextSearchScore;
import javax.jcr.query.qom.Length;
import javax.jcr.query.qom.LowerCase;
import javax.jcr.query.qom.NodeLocalName;
import javax.jcr.query.qom.NodeName;
import javax.jcr.query.qom.PropertyValue;
import javax.jcr.query.qom.UpperCase;
import javax.jcr.query.qom.QueryObjectModelConstants;
import javax.jcr.Value;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;
/**
* <code>QOMFormatter</code> implements a formatter that translates a query
* object model into a JCR_SQL2 string statement.
*/
public class QOMFormatter implements QueryObjectModelConstants {
/**
* BitSet of valid SQL identifier start characters.
*/
private static final BitSet IDENTIFIER_START = new BitSet();
/**
* BitSet of valid SQL identifier body characters.
*/
private static final BitSet IDENTIFIER_PART_OR_UNDERSCORE = new BitSet();
static {
for (char c = 'a'; c <= 'z'; c++) {
IDENTIFIER_START.set(c);
}
for (char c = 'A'; c <= 'Z'; c++) {
IDENTIFIER_START.set(c);
}
IDENTIFIER_PART_OR_UNDERSCORE.or(IDENTIFIER_START);
for (char c = '0'; c <= '9'; c++) {
IDENTIFIER_PART_OR_UNDERSCORE.set(c);
}
IDENTIFIER_PART_OR_UNDERSCORE.set('_');
}
/**
* The query object model to format.
*/
private final QueryObjectModel qom;
/**
* The JCR_SQL2 statement.
*/
private final StringBuilder sb = new StringBuilder();
/**
* Private constructor.
*
* @param qom the query object model to format.
*/
private QOMFormatter(QueryObjectModel qom) {
this.qom = qom;
}
/**
* Formats the given <code>qom</code> as a JCR_SQL2 query statement.
*
* @param qom the query object model to translate.
* @return the JCR_SQL2 statement.
* @throws RepositoryException if an error occurs while formatting the qom.
*/
public static String format(QueryObjectModel qom)
throws RepositoryException {
return new QOMFormatter(qom).format();
}
private String format() throws RepositoryException {
append("SELECT ");
append(qom.getColumns());
append(" FROM ");
append(qom.getSource());
Constraint c = qom.getConstraint();
if (c != null) {
append(" WHERE ");
append(c);
}
Ordering[] orderings = qom.getOrderings();
if (orderings.length > 0) {
append(" ORDER BY ");
append(orderings);
}
return sb.toString();
}
private void append(Ordering[] orderings) {
String comma = "";
for (Ordering ordering : orderings) {
append(comma);
comma = ", ";
append(ordering.getOperand());
if (JCR_ORDER_DESCENDING.equals(ordering.getOrder())) {
append(" DESC");
}
}
}
private void append(Constraint c)
throws RepositoryException {
if (c instanceof And) {
append((And) c);
} else if (c instanceof ChildNode) {
append((ChildNode) c);
} else if (c instanceof Comparison) {
append((Comparison) c);
} else if (c instanceof DescendantNode) {
append((DescendantNode) c);
} else if (c instanceof FullTextSearch) {
append((FullTextSearch) c);
} else if (c instanceof Not) {
append((Not) c);
} else if (c instanceof Or) {
append((Or) c);
} else if (c instanceof PropertyExistence) {
append((PropertyExistence) c);
} else {
append((SameNode) c);
}
}
private void append(And constraint)
throws RepositoryException {
String and = "";
for (Constraint c : Arrays.asList(
constraint.getConstraint1(),
constraint.getConstraint2())) {
append(and);
and = " AND ";
boolean paren = c instanceof Or || c instanceof Not;
if (paren) {
append("(");
}
append(c);
if (paren) {
append(")");
}
}
}
private void append(ChildNode constraint) {
append("ISCHILDNODE(");
appendName(constraint.getSelectorName());
append(", ");
appendPath(constraint.getParentPath());
append(")");
}
private void append(Comparison constraint)
throws RepositoryException {
append(constraint.getOperand1());
append(" ");
appendOperator(constraint.getOperator());
append(" ");
append(constraint.getOperand2());
}
private void append(StaticOperand operand)
throws RepositoryException {
if (operand instanceof BindVariableValue) {
append((BindVariableValue) operand);
} else {
append((Literal) operand);
}
}
private void append(BindVariableValue value) {
append("$");
append(value.getBindVariableName());
}
private void append(Literal value)
throws RepositoryException {
Value v = value.getLiteralValue();
switch (v.getType()) {
case PropertyType.BINARY:
appendCastLiteral(v.getString(), "BINARY");
break;
case PropertyType.BOOLEAN:
append(v.getString());
break;
case PropertyType.DATE:
appendCastLiteral(v.getString(), "DATE");
break;
case PropertyType.DECIMAL:
append(v.getString());
break;
case PropertyType.DOUBLE:
append(v.getString());
break;
case PropertyType.LONG:
append(v.getString());
break;
case PropertyType.NAME:
appendCastLiteral(v.getString(), "NAME");
break;
case PropertyType.PATH:
appendCastLiteral(v.getString(), "PATH");
break;
case PropertyType.REFERENCE:
appendCastLiteral(v.getString(), "REFERENCE");
break;
case PropertyType.STRING:
appendStringLiteral(v.getString());
break;
case PropertyType.URI:
appendCastLiteral(v.getString(), "URI");
break;
case PropertyType.WEAKREFERENCE:
appendCastLiteral(v.getString(), "WEAKREFERENCE");
break;
}
}
private void appendCastLiteral(String value, String propertyType) {
append("CAST(");
appendStringLiteral(value);
append(" AS ");
append(propertyType);
append(")");
}
private void appendStringLiteral(String value) {
append("'");
append(value.replaceAll("'", "''"));
append("'");
}
private void appendOperator(String operator) {
if (JCR_OPERATOR_EQUAL_TO.equals(operator)) {
append("=");
} else if (JCR_OPERATOR_GREATER_THAN.equals(operator)) {
append(">");
} else if (JCR_OPERATOR_GREATER_THAN_OR_EQUAL_TO.equals(operator)) {
append(">=");
} else if (JCR_OPERATOR_LESS_THAN.equals(operator)) {
append("<");
} else if (JCR_OPERATOR_LESS_THAN_OR_EQUAL_TO.equals(operator)) {
append("<=");
} else if (JCR_OPERATOR_LIKE.equals(operator)) {
append("LIKE");
} else {
append("<>");
}
}
private void append(DynamicOperand operand) {
if (operand instanceof FullTextSearchScore) {
append((FullTextSearchScore) operand);
} else if (operand instanceof Length) {
append((Length) operand);
} else if (operand instanceof LowerCase) {
append((LowerCase) operand);
} else if (operand instanceof NodeLocalName) {
append((NodeLocalName) operand);
} else if (operand instanceof NodeName) {
append((NodeName) operand);
} else if (operand instanceof PropertyValue) {
append((PropertyValue) operand);
} else {
append((UpperCase) operand);
}
}
private void append(FullTextSearchScore operand) {
append("SCORE(");
appendName(operand.getSelectorName());
append(")");
}
private void append(Length operand) {
append("LENGTH(");
append(operand.getPropertyValue());
append(")");
}
private void append(LowerCase operand) {
append("LOWER(");
append(operand.getOperand());
append(")");
}
private void append(NodeLocalName operand) {
append("LOCALNAME(");
appendName(operand.getSelectorName());
append(")");
}
private void append(NodeName operand) {
append("NAME(");
appendName(operand.getSelectorName());
append(")");
}
private void append(PropertyValue operand) {
appendName(operand.getSelectorName());
append(".");
appendName(operand.getPropertyName());
}
private void append(UpperCase operand) {
append("UPPER(");
append(operand.getOperand());
append(")");
}
private void append(DescendantNode constraint) {
append("ISDESCENDANTNODE(");
appendName(constraint.getSelectorName());
append(", ");
appendPath(constraint.getAncestorPath());
append(")");
}
private void append(FullTextSearch constraint) throws RepositoryException {
append("CONTAINS(");
appendName(constraint.getSelectorName());
append(".");
String propName = constraint.getPropertyName();
if (propName == null) {
append("*");
} else {
appendName(propName);
}
append(", ");
append(constraint.getFullTextSearchExpression());
append(")");
}
private void append(Not constraint) throws RepositoryException {
append("NOT ");
Constraint c = constraint.getConstraint();
boolean paren = c instanceof And || c instanceof Or;
if (paren) {
append("(");
}
append(c);
if (paren) {
append(")");
}
}
private void append(Or constraint) throws RepositoryException {
append(constraint.getConstraint1());
append(" OR ");
append(constraint.getConstraint2());
}
private void append(PropertyExistence constraint) {
appendName(constraint.getSelectorName());
append(".");
appendName(constraint.getPropertyName());
append(" IS NOT NULL");
}
private void append(SameNode constraint) {
append("ISSAMENODE(");
appendName(constraint.getSelectorName());
append(", ");
appendPath(constraint.getPath());
append(")");
}
private void append(Column[] columns) {
if (columns.length == 0) {
append("*");
} else {
String comma = "";
for (Column c : columns) {
append(comma);
comma = ", ";
appendName(c.getSelectorName());
append(".");
String propName = c.getPropertyName();
if (propName != null) {
appendName(propName);
if (c.getColumnName() != null) {
append(" AS ");
appendName(c.getColumnName());
}
} else {
append("*");
}
}
}
}
private void append(Source source) {
if (source instanceof Join) {
append((Join) source);
} else {
append((Selector) source);
}
}
private void append(Join join) {
append(join.getLeft());
append(" ");
appendJoinType(join.getJoinType());
append(" JOIN ");
append(join.getRight());
append(" ON ");
append(join.getJoinCondition());
}
private void append(JoinCondition joinCondition) {
if (joinCondition instanceof EquiJoinCondition) {
append((EquiJoinCondition) joinCondition);
} else if (joinCondition instanceof ChildNodeJoinCondition) {
append((ChildNodeJoinCondition) joinCondition);
} else if (joinCondition instanceof DescendantNodeJoinCondition) {
append((DescendantNodeJoinCondition) joinCondition);
} else {
append((SameNodeJoinCondition) joinCondition);
}
}
private void append(EquiJoinCondition condition) {
appendName(condition.getSelector1Name());
append(".");
appendName(condition.getProperty1Name());
append(" = ");
appendName(condition.getSelector2Name());
append(".");
appendName(condition.getProperty2Name());
}
private void append(ChildNodeJoinCondition condition) {
append("ISCHILDNODE(");
appendName(condition.getChildSelectorName());
append(", ");
appendName(condition.getParentSelectorName());
append(")");
}
private void append(DescendantNodeJoinCondition condition) {
append("ISDESCENDANTNODE(");
appendName(condition.getDescendantSelectorName());
append(", ");
appendName(condition.getAncestorSelectorName());
append(")");
}
private void append(SameNodeJoinCondition condition) {
append("ISSAMENODE(");
appendName(condition.getSelector1Name());
append(", ");
appendName(condition.getSelector2Name());
if (condition.getSelector2Path() != null) {
append(", ");
appendPath(condition.getSelector2Path());
}
append(")");
}
private void appendPath(String path) {
if (isSimpleName(path)) {
append(path);
} else {
append("[");
append(path);
append("]");
}
}
private void appendJoinType(String joinType) {
if (joinType.equals(JCR_JOIN_TYPE_INNER)) {
append("INNER");
} else if (joinType.equals(JCR_JOIN_TYPE_LEFT_OUTER)) {
append("LEFT OUTER");
} else {
append("RIGHT OUTER");
}
}
private void append(Selector selector) {
appendName(selector.getNodeTypeName());
if (!selector.getSelectorName().equals(selector.getNodeTypeName())) {
append(" AS ");
appendName(selector.getSelectorName());
}
}
private void appendName(String name) {
if (isSimpleName(name)) {
append(name);
} else {
append("[");
append(name);
append("]");
}
}
private static boolean isSimpleName(String name) {
for (int i = 0; i < name.length(); i++) {
char c = name.charAt(i);
if (i == 0) {
if (!IDENTIFIER_START.get(c)) {
return false;
}
} else {
if (!IDENTIFIER_PART_OR_UNDERSCORE.get(c)) {
return false;
}
}
}
return true;
}
private void append(String s) {
sb.append(s);
}
}