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MODE-2734: cannot parse query bind variable names containing arguably esoteric but valid characters

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MODE-2527 Renames the schematic package to org.modeshape and removes all ISPN related code.

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MODE-2166 Adds CAST dynamic operand for JCR-SQL2.

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MODE-2151 Added support for CHILDCOUNT dynamic operand

Pretty basic support that should prove quite useful in certain situations. This may be relatively

expensive when the repository has nodes with lots of children since it requires loading the parent

node's child references in order to obtain the count. The CHILDCOUNT criteria would therefore work

much better/faster as filtering criteria in a query that already defines criteria that indexes can

use.

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MODE-1671 Added 'mode:id' pseudocolumn for JCR-SQL2 queries

It is now possible to use the 'mode:id' pseudocolumn that exists on all selectors

to obtain the javax.jcr.Node.getIdentifier() value. It can be used in WHERE constraints

and JOIN criteria.

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MODE-2246 Implemented default FTS via strict regex matching. No stemming or punctuation processing is done by default (unlike what Lucene did in 3.x) which means that some of the tests had to be adapted. Also, enabled back the tests that had been previously disabled for full text search.

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MODE-2018 Implemented new query engine.

Refactored the query functionality to now use several new service provider interfaces (SPI),

and implemented a new query engine that can take advantage of administrator-defined indexes.

When no such indexes are defined, the query engine is able to still answer the queries

by "scanning" all nodes in the repository. This is like a regular relational database:

all query functionality works (albeith slowly) even when no indexes are defined, though

to improve performance simply define an appropriate index based upon the query or queries

that are being used.

All of ModeShape's query parsing, planning, and optimization steps are basically unchanged

from the previous query system. There is one addition to the rule-based optimizer: a new

rule looks at query plans and adds the potential indexes that might be of use in each

access query portion of a query plan. Then, the query execution process (see below)

chooses one of the identified indexes based upon the selectivity and cardinality. If no index

is available for that portion of the query plan, then the query engine simply iterates

over all queryable nodes in the repository.

A new kind of component, called a "query index provider", allows the query engine to delegate

various responsibilities around indexes to these providers. For example, a provider must

provide an index planner that can examine the constraints that apply to an access query

and determine if any of the provider's indexes can be used. When they are, ModeShape

adds those indexes to the query plan. If the query engine uses one of those indexes,

then provider must be able to return all of those nodes that satisfy the criteria

as described earlier by its index planner. Finally, as ModeShape content changes, ModeShape

will notify the index providers' of the changes so that they can ensure their indexes

are kept up-to-date with the content.

This means that a provider can implement the functionality using any kind of technology,

and consequently, that ModeShape can begin to leverage multiple kinds of search and index

technology within its query system. The ModeShape community anticipates having providers

that use Lucene, Solr, and ElasticSearch. ModeShape will also likely come with a provider

that maintains file-system based indexes. Additionally, providers can optionally support

indexes on one or more properties. Thus, it will be possible to mix and match

these providers, selecting the best technology for the specific kind of index.

The new query engine does the execution in a very different way than the previous engine,

which used Lucene to determine the tuples (that is, the values in each row) for each access

query and that were then further processed and combined to form the tuples that were returned

in the result set. The new engine instead uses a new concept of a "stream of node keys"

for each access query: what actually implements that stream depends on many factors.

A node sequence is an abstraction of a stream of "rows" containing one or more node keys.

The interfaces are designed to make it possibly to lazily implement a stream in a very

efficient manner. Specifically, a node stream is actually comprised of multiple "batches"

of rows, and batches can be of any size.

Consider when the engine findes no indexes are available for a certain access query. The

engine simply uses a "node sequence" (or NodeSequence) implementation that returns in batches

a row for each node in the repository.

But if an access query involves a criteria on the path of a node, such as

"... WHERE ISSAMENODE('/foo/bar') ...", then ModeShape knows that this query (or portion of

a query) will have only one result, namely the node at "/foo/bar". ModeShape doesn't need

an index to quickly find this node; it merely has to navigate to that path to find the one

node that satisfies this query. ModeShape has several other optimizations, too: it knows

when a query involves all children or descendants of a node at a given path, and can take

this into account when optimizing and executing the query. All of these are handled with

special NodeSequence implementations optimized for each case.

For many access queries (i.e., part of a larger query), the engine will use one of the

indexes identified by one of the providers. When this happens, ModeShape uses other

NodeSequence implementations that utilize the underlying indexes to find the nodes that satisfy

some of the criteria.

The above describes how the engine uses a single NodeSequence instance for each each access

query in a larger query. But how does the engine combine these to determine the ultimate

query results? Basically, the engine constructs a series of functions that process one or more

NodeSequence instances to filter and combine into other NodeSequences.

For example, a custom index might be used to find all nodes that have a 'jcr:lastModified'

timestamp within some range. Presumably this index is used because it has a higher selectivity,

meaning that it will filter out more nodes and return fewer nodes than other indexes.

Other criteria that are also applied to this access query might then be applied by a filter

that processes the actual nodes' property values.

While the result of this commit is a functioning query engine that is shown to work in most

of the query-related unit and integration tests, there still are a few areas that are not complete.

Specifically:

* The new engine does not support full-text search, and currently throws an exception

* No index providers are implemented. Therefore, all queries involve "scanning" the repository.

This can be time consuming, especially for federated repositories. Consequently, all such

tests that query federated content have been disabled/ignored.

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MODE-2081 Changed the remaining files over to the ASL 2.0 license

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MODE-2027 Updated full text search query parsing so that the dot (.) selector is treated as selector.*

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MODE-2037: Extended like operation (reverse like implementation)

Added a reverse like (e.g., "RELIKE") constraint that is useful when

the LIKE pattern is stored in a node property and the intent is to

find all nodes that have a pattern that matches a given string:

SELECT *

FROM [service:Locator] AS locator

WHERE relike($phone, locator.[service:phonePattern])

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Corrected compiler warnings

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Corrected compiler warnings and removed unnecessary JavaDoc

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MODE-1840 CONTAINS clause should allow use of bind variables

Per the JCR 2.0 specification, the 'CONTAINS' clause in JCR-SQL2 queries

allows using a bind variable in place of the full text search expression.

This commit adds this support, including two new test cases that

verify the functionality.

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MODE-1614 - Fixed various usages of ValueFormatException

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Fixed javadoc errors that occurred when moving from Eclipse Helios to Eclipse Indigo. Also fixed a pom error that occurred when upgrading Eclipse.

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MODE-1556 Corrected the handling of != (or <>) query criteria on numeric fields

Numeric values were not being handled consistently in the indexes and in queries. For example,

some values were being treated as integer values in the indexes and queried as longs (which

doesn't work). Additionally, some of the logic of handling and combining "not" queries was

incorrect.

All unit and integration tests pass with these changes.

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MODE-1468 Corrected JCR-JQOM functionality

Corrected a lot of incorrect JCR-JQOM functionality, especially in the QueryObjectModel

instances' string statements, which are now completely parsable as JCR-SQL2. Thus,

one can always convert QOM to JCR-SQL2 -- and since we internally parse the JCR-SQL2

as a QOM, we can actually go full circle.

That wasn't the only correction. When using the QOM, literal values can take on a different

form; the same form as when using explicit "CAST(...)" functions in JCR-SQL2. But since

CASTs are not often used, executing a typical JCR-SQL2 with string literals worked well

but executing a QOM with correctly-typed literals didn't. Now, executing a QOM with

string-form literals or properly-typed literals works the same way.

Additionally, many of the TCK QOM tests pointed out deficiencies in our QOM validation

and results. Most of these were corrected, although several outstanding problems are now

described by other issues (MODE-1485, MODE-1095, and JCR-3313).

All tests pass with these changes.

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MODE-1430 Enabled the RESTful services within the build

The Maven modules that make up the RESTful service and it's dependencies (e.g., the

local JDBC driver) have been added back into the build. Several changes were required

to correct the test cases' expected results, and to change the test repository

configurations. The JBoss AS 7 kit also is now including the customized RESTful

WAR file.

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MODE-1418 Corrected certain queries with full-text search criteria

Certain JCR-SQL2 full-text search criteria were not being processed correctly.

Any f.t.s. criteria that specified a single property resulted in an incorrect

query plan.

Several changes were made to correct this behavior, and new unit tests were added.

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MODE-1368 Removed all legacy modules no longer needed in 3.x

ModeShape 3.x will not need a number of the 2.x modules. In particular:

- since 3.x will only have an AS7 kit, the AS5 or AS6 artifacts were removed

- all the connectors were removed, since they're no longer used

- the connector benchmark tests module was removed, replaced by our new

performance test suite

- the JPA DDL generator utility has been removed

- the 'modeshape-graph', 'modeshape-repository', 'modeshape-search-lucene'

and 'modeshape-clustering' modules have all been removed, since the new

'modeshape-jcr' module no longer uses them

- the DocBook modules were removed and are replaced by the Confluence space

- the two JDBC modules were moved out of the 'utils' directory to top-level modules

The build still works, but not all components have been included in the build.

This is because the query functionality doesn't yet work, so quite a few web

and JDBC driver modules all depend on this.

The assembly profile has not yet been changed or corrected.

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