Examples of org.jboss.dna.graph.query.model.ChildNodeJoinCondition

org.jboss.dna.graph.query.model.ChildNodeJoinCondition
A join condition that evaluates to true only when the named child node is indeed a child of the named parent node.

            SelectorName replacement2 = rewrittenSelectors.get(condition.getSelector2Name());
            if (replacement1 == condition.getSelector1Name() && replacement2 == condition.getSelector2Name()) return condition;
            return new SameNodeJoinCondition(replacement1, replacement2, condition.getSelector2Path());
        }
        if (joinCondition instanceof ChildNodeJoinCondition) {
            ChildNodeJoinCondition condition = (ChildNodeJoinCondition)joinCondition;
            SelectorName childSelector = rewrittenSelectors.get(condition.getChildSelectorName());
            SelectorName parentSelector = rewrittenSelectors.get(condition.getParentSelectorName());
            if (childSelector == condition.getChildSelectorName() && parentSelector == condition.getParentSelectorName()) return condition;
            return new ChildNodeJoinCondition(parentSelector, childSelector);
        }
        if (joinCondition instanceof DescendantNodeJoinCondition) {
            DescendantNodeJoinCondition condition = (DescendantNodeJoinCondition)joinCondition;
            SelectorName ancestor = rewrittenSelectors.get(condition.getAncestorSelectorName());
            SelectorName descendant = rewrittenSelectors.get(condition.getDescendantSelectorName());
            if (ancestor == condition.getAncestorSelectorName() && descendant == condition.getDescendantSelectorName()) return condition;
            return new ChildNodeJoinCondition(ancestor, descendant);
        }
        return joinCondition;
    }

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                    case MERGE:
                        if (joinCondition instanceof SameNodeJoinCondition) {
                            SameNodeJoinCondition condition = (SameNodeJoinCondition)joinCondition;
                            component = new MergeJoinComponent(context, left, right, condition, joinType);
                        } else if (joinCondition instanceof ChildNodeJoinCondition) {
                            ChildNodeJoinCondition condition = (ChildNodeJoinCondition)joinCondition;
                            component = new MergeJoinComponent(context, left, right, condition, joinType);
                        } else if (joinCondition instanceof EquiJoinCondition) {
                            EquiJoinCondition condition = (EquiJoinCondition)joinCondition;
                            component = new MergeJoinComponent(context, left, right, condition, joinType);
                        } else {

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            node.addSelector(replacement1, replacement2);
            if (condition.getSelector2Path() == null) return new SameNodeJoinCondition(replacement1, replacement2);
            return new SameNodeJoinCondition(replacement1, replacement2, condition.getSelector2Path());
        }
        if (joinCondition instanceof ChildNodeJoinCondition) {
            ChildNodeJoinCondition condition = (ChildNodeJoinCondition)joinCondition;
            SelectorName childSelector = condition.getChildSelectorName();
            SelectorName parentSelector = condition.getParentSelectorName();
            if (childSelector.equals(viewName)) childSelector = sourceName;
            if (parentSelector.equals(viewName)) parentSelector = sourceName;
            if (childSelector == condition.getChildSelectorName() && parentSelector == condition.getParentSelectorName()) return condition;
            node.addSelector(childSelector, parentSelector);
            return new ChildNodeJoinCondition(parentSelector, childSelector);
        }
        if (joinCondition instanceof DescendantNodeJoinCondition) {
            DescendantNodeJoinCondition condition = (DescendantNodeJoinCondition)joinCondition;
            SelectorName ancestor = condition.getAncestorSelectorName();
            SelectorName descendant = condition.getDescendantSelectorName();
            if (ancestor.equals(viewName)) ancestor = sourceName;
            if (descendant.equals(viewName)) descendant = sourceName;
            if (ancestor == condition.getAncestorSelectorName() && descendant == condition.getDescendantSelectorName()) return condition;
            node.addSelector(ancestor, descendant);
            return new ChildNodeJoinCondition(ancestor, descendant);
        }
        return joinCondition;
    }

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         * @param childTable the name or alias of the table containing the child node
         * @return the query builder instance, for method chaining purposes
         */
        public QueryBuilder onChildNode( String parentTable,
                                         String childTable ) {
            return createJoin(new ChildNodeJoinCondition(nameOf(parentTable), nameOf(childTable)));
        }

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        if (tokens.canConsume("ISCHILDNODE", "(")) {
            SelectorName child = parseSelectorName(tokens);
            tokens.consume(',');
            SelectorName parent = parseSelectorName(tokens);
            tokens.consume(')');
            return new ChildNodeJoinCondition(parent, child);
        }
        if (tokens.canConsume("ISDESCENDANTNODE", "(")) {
            SelectorName descendant = parseSelectorName(tokens);
            tokens.consume(',');
            SelectorName ancestor = parseSelectorName(tokens);

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     * @return the value selector; never null
     */
    protected static ValueSelector valueSelectorFor( ProcessingComponent source,
                                                     JoinCondition condition ) {
        if (condition instanceof ChildNodeJoinCondition) {
            ChildNodeJoinCondition joinCondition = (ChildNodeJoinCondition)condition;
            String childSelectorName = joinCondition.getChildSelectorName().getName();
            if (source.getColumns().hasSelector(childSelectorName)) {
                return selectPath(source, childSelectorName);
            }
            String parentSelectorName = joinCondition.getParentSelectorName().getName();
            return selectPath(source, parentSelectorName);
        } else if (condition instanceof SameNodeJoinCondition) {
            SameNodeJoinCondition joinCondition = (SameNodeJoinCondition)condition;
            String selector1Name = joinCondition.getSelector1Name().getName();
            if (source.getColumns().hasSelector(selector1Name)) {
                return selectPath(source, selector1Name);
            }
            String selector2Name = joinCondition.getSelector2Name().getName();
            return selectPath(source, selector2Name);
        } else if (condition instanceof DescendantNodeJoinCondition) {
            DescendantNodeJoinCondition joinCondition = (DescendantNodeJoinCondition)condition;
            String ancestorSelectorName = joinCondition.getAncestorSelectorName().getName();
            if (source.getColumns().hasSelector(ancestorSelectorName)) {
                return selectPath(source, ancestorSelectorName);
            }
            String descendantSelectorName = joinCondition.getDescendantSelectorName().getName();
            return selectPath(source, descendantSelectorName);
        } else if (condition instanceof EquiJoinCondition) {
            EquiJoinCondition joinCondition = (EquiJoinCondition)condition;
            SelectorName selector1Name = joinCondition.getSelector1Name();
            String propName1 = joinCondition.getProperty1Name();
            if (source.getColumns().hasSelector(selector1Name.getName())) {
                return selectValue(source, selector1Name, propName1);
            }
            SelectorName selector2Name = joinCondition.getSelector2Name();
            String propName2 = joinCondition.getProperty2Name();
            return selectValue(source, selector2Name, propName2);
        }
        throw new IllegalArgumentException();
    }

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                                         Object rightValue ) {
                    return leftValue.equals(rightValue);
                }
            };
        } else if (condition instanceof ChildNodeJoinCondition) {
            ChildNodeJoinCondition joinCondition = (ChildNodeJoinCondition)condition;
            String childSelectorName = joinCondition.getChildSelectorName().getName();
            if (left.getColumns().hasSelector(childSelectorName)) {
                // The child is on the left ...
                return new Joinable() {
                    public boolean evaluate( Object childLocation,
                                             Object parentLocation ) {
                        Path childPath = ((Location)childLocation).getPath();
                        Path parentPath = ((Location)parentLocation).getPath();
                        return childPath.getParent().isSameAs(parentPath);
                    }
                };
            }
            // The child is on the right ...
            return new Joinable() {
                public boolean evaluate( Object parentLocation,
                                         Object childLocation ) {
                    Path childPath = ((Location)childLocation).getPath();
                    Path parentPath = ((Location)parentLocation).getPath();
                    return childPath.getParent().isSameAs(parentPath);
                }
            };
        } else if (condition instanceof DescendantNodeJoinCondition) {
            DescendantNodeJoinCondition joinCondition = (DescendantNodeJoinCondition)condition;
            String ancestorSelectorName = joinCondition.getAncestorSelectorName().getName();
            if (left.getColumns().hasSelector(ancestorSelectorName)) {
                // The ancestor is on the left ...
                return new Joinable() {
                    public boolean evaluate( Object ancestorLocation,
                                             Object descendantLocation ) {

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                    return pathComparator.compare(path1, path2);
                }
            };
        }
        if (condition instanceof ChildNodeJoinCondition) {
            ChildNodeJoinCondition joinCondition = (ChildNodeJoinCondition)condition;
            String childSelectorName = joinCondition.getChildSelectorName().getName();
            if (left.getColumns().hasSelector(childSelectorName)) {
                // The child is on the left ...
                return new Comparator<Object>() {
                    public int compare( Object childLocation,
                                        Object parentLocation ) {
                        Path childPath = ((Location)childLocation).getPath();
                        Path parentPath = ((Location)parentLocation).getPath();
                        if (childPath.isRoot()) return parentPath.isRoot() ? 0 : -1;
                        Path parentOfChild = childPath.getParent();
                        return pathComparator.compare(parentPath, parentOfChild);
                    }
                };
            }
            // The child is on the right ...
            return new Comparator<Object>() {
                public int compare( Object parentLocation,
                                    Object childLocation ) {
                    Path childPath = ((Location)childLocation).getPath();
                    Path parentPath = ((Location)parentLocation).getPath();
                    if (childPath.isRoot()) return parentPath.isRoot() ? 0 : -1;
                    Path parentOfChild = childPath.getParent();
                    return pathComparator.compare(parentPath, parentOfChild);
                }
            };
        }
        if (condition instanceof EquiJoinCondition) {
            EquiJoinCondition joinCondition = (EquiJoinCondition)condition;
            SelectorName leftSelectorName = joinCondition.getSelector1Name();
            SelectorName rightSelectorName = joinCondition.getSelector2Name();
            String leftPropertyName = joinCondition.getProperty1Name();
            String rightPropertyName = joinCondition.getProperty2Name();


            Schemata schemata = context.getSchemata();
            Schemata.Table leftTable = schemata.getTable(leftSelectorName);
            Schemata.Column leftColumn = leftTable.getColumn(leftPropertyName);
            String leftType = leftColumn.getPropertyType();

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            } else {
                leftSortBy.add(name2);
                rightSortBy.add(name1);
            }
        } else if (condition instanceof ChildNodeJoinCondition) {
            ChildNodeJoinCondition joinCondition = (ChildNodeJoinCondition)condition;
            SelectorName childName = joinCondition.getChildSelectorName();
            SelectorName parentName = joinCondition.getParentSelectorName();
            if (leftSelectors.contains(childName)) {
                leftSortBy.add(childName);
                rightSortBy.add(parentName);
            } else {
                leftSortBy.add(parentName);
                rightSortBy.add(childName);
            }
        } else if (condition instanceof EquiJoinCondition) {
            EquiJoinCondition joinCondition = (EquiJoinCondition)condition;
            SelectorName selector1 = joinCondition.getSelector1Name();
            SelectorName selector2 = joinCondition.getSelector2Name();
            String property1 = joinCondition.getProperty1Name();
            String property2 = joinCondition.getProperty2Name();


            // Create the Ordering for the first selector/property pair ...
            DynamicOperand operand1 = new PropertyValue(selector1, property1);
            Ordering ordering1 = new Ordering(operand1, Order.ASCENDING);
            // Create the Ordering for the second selector/property pair ...

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Related Classes of org.jboss.dna.graph.query.model.ChildNodeJoinCondition

org.jboss.dna.graph.query.optimize.ChooseJoinAlgorithm

org.jboss.dna.graph.query.parse.SqlQueryParser

org.jboss.dna.graph.query.plan.PlanUtil

org.jboss.dna.graph.query.process.JoinComponent

org.jboss.dna.graph.query.process.QueryProcessor

org.jboss.dna.graph.query.QueryBuilder$JoinClause

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