prolog.implementation
Class AndStatement

java.lang.Object
  |
  +--prolog.implementation.Fact
        |
        +--prolog.implementation.AbstractStatement
              |
              +--prolog.implementation.NodeStatement
                    |
                    +--prolog.implementation.AndStatement

All Implemented Interfaces:

IFact, IStatement

Direct Known Subclasses:

DemoAndStatement

public class AndStatement

extends NodeStatement

The AndStatement represents the and operation over two tables.

Inner Class Summary

protected class

AndStatement.CacheMap this class is the implementation of a cache map

Fields inherited from class prolog.implementation.NodeStatement

childs

Fields inherited from class prolog.implementation.Fact

name, relation

Constructor Summary

AndStatement(IFact f)
constructor 2

AndStatement(int name)
constructor 1

Method Summary

protected boolean	addMatching(AndStatement.CacheMap m, java.lang.Object key, java.lang.Object mapping) checks wether the key is allready stored in the cachmap. if not, the value is stored and true is returned. if yes, it was stored, the stored value is compared with the given mapping. then the result of the comparation is returned
protected void	findMatching(IFact f, java.util.List all, int index, IFactList finalResults, AndStatement.CacheMap cachMap) finds all matchings in the list with results collected by query and puts it in targetformat into the finalresult factlist
IFactList	query(IFact f, IFactDb l, IStatementMap constraints) queries the child nodes and calls the recursive findMatching method to merge all results.
java.lang.String	toString()
java.lang.String	toString(ISymbolTable table) returns a string representation of this class with decoded symbols

Methods inherited from class prolog.implementation.NodeStatement

addStatement, genXml

Methods inherited from class prolog.implementation.AbstractStatement

generateFact, generateRelation

Methods inherited from class prolog.implementation.Fact

addAttribute, getName, getRelation

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, wait, wait, wait

Methods inherited from interface prolog.model.IFact

getName, getRelation

Constructor Detail

AndStatement

public AndStatement(int name)

constructor 1

AndStatement

public AndStatement(IFact f)

constructor 2

Method Detail

query

public IFactList query(IFact f,
                       IFactDb l,
                       IStatementMap constraints)
                throws ParameterMatchingError

queries the child nodes and calls the recursive findMatching method to merge all results.

Parameters:

f - - the target format

l - - the fact database

constraints - - the statements to resolve when not found in fdb

Returns:

a result factlist with all matching results in the format described in the f parameter fact

Throws:

ParameterMatchingError -

findMatching

protected void findMatching(IFact f,
                            java.util.List all,
                            int index,
                            IFactList finalResults,
                            AndStatement.CacheMap cachMap)
                     throws java.lang.Exception

finds all matchings in the list with results collected by query and puts it in targetformat into the finalresult factlist

Parameters:

f - - the target format

all - - the list with matchings returned by the childs

index - - the index of the current factlist, begins with 0

finalResults - - the collector for really matching final results

cachMap - - the cachemap used to find matching values

Returns:

Throws:

java.lang.Exception -

addMatching

protected boolean addMatching(AndStatement.CacheMap m,
                              java.lang.Object key,
                              java.lang.Object mapping)

checks wether the key is allready stored in the cachmap. if not, the value is stored and true is returned. if yes, it was stored, the stored value is compared with the given mapping. then the result of the comparation is returned

Parameters:

m - - the cachemap where to add the matching

key - - the key under which the value should be stored

mapping - - the value to be stored

Returns:

true if the given key and mapping does not produce any conflicts, else false

toString

public java.lang.String toString()

Overrides:

toString in class Fact

Returns:

a string representation of this class

toString

public java.lang.String toString(ISymbolTable table)

returns a string representation of this class with decoded symbols

Overrides:

toString in class Fact

Parameters:

table - - the symboltable to decode the symbols

Returns:

a string representation of this class