wam 2002/05/31 05:23:24
Modified: src/share/org/apache/slide/search/basic BasicQuery.java
BasicSearchLanguage.java
Added: src/share/org/apache/slide/search/basic
BasicQueryFactory.java BasicQueryImpl.java
Log:
make the implementation of BasicQuery pluggable
Revision Changes Path
1.9 +131 -203
jakarta-slide/src/share/org/apache/slide/search/basic/BasicQuery.java
Index: BasicQuery.java
===================================================================
RCS file:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicQuery.java,v
retrieving revision 1.8
retrieving revision 1.9
diff -u -r1.8 -r1.9
--- BasicQuery.java 25 Apr 2002 21:12:30 -0000 1.8
+++ BasicQuery.java 31 May 2002 12:23:23 -0000 1.9
@@ -1,7 +1,7 @@
/*
- * $Header:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicQuery.java,v 1.8
2002/04/25 21:12:30 jericho Exp $
- * $Revision: 1.8 $
- * $Date: 2002/04/25 21:12:30 $
+ * $Header:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicQuery.java,v 1.9
2002/05/31 12:23:23 wam Exp $
+ * $Revision: 1.9 $
+ * $Date: 2002/05/31 12:23:23 $
*
* ====================================================================
*
@@ -62,10 +62,10 @@
*/
package org.apache.slide.search.basic;
-import org.apache.slide.search.*;
+import org.apache.slide.search.SearchToken;
+import org.apache.slide.search.QueryScope;
import org.apache.slide.search.SearchQuery;
-import org.apache.slide.search.SearchException;
import org.apache.slide.search.BadQueryException;
import org.apache.slide.search.SearchQueryResult;
import org.apache.slide.common.ServiceAccessException;
@@ -79,112 +79,68 @@
import org.jdom.Namespace;
import org.jdom.Element;
import org.jdom.Document;
-import org.xml.sax.InputSource;
-
-//import org.apache.slide.common.SlideToken;
import java.io.StringReader;
import java.util.List;
import java.util.Set;
/**
- * A BasicSearchQuery represents the query and is able to deliver a
- * SearchQueryResult using the execute method. It may serve as a base class for
+ * A BasicQuery represents the query and is able to deliver a
+ * SearchQueryResult using the execute method. It serves as a base class for
* store specific implementations. It hosts the information about the SELECT,
* FROM, WHERE, ORDERBY and LIMIT. It also holds a tree of
* BasicSearchExpressions.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Martin Wallmer</a>
- * @version $Revision: 1.8 $
+ * @version $Revision: 1.9 $
*/
-public class BasicQuery extends SearchQuery {
+public abstract class BasicQuery extends SearchQuery {
/** all resources within the scope */
- private RequestedResourcesPool requestedResources;
+ protected RequestedResourcesPool requestedResources;
/** the element describing this query */
- private Element queryElement;
+ protected Element queryElement;
/** the namespace for this query */
- private Namespace namespace;
+ protected Namespace namespace;
/** the scope of this query, <FROM> */
- private QueryScope scope;
+ protected QueryScope scope;
+
+ /** the element describing the WHERE clauise */
+ protected Element whereElement;
/** List of requested properties, <SELECT> */
- private RequestedProperties requestedProperties;
+ protected RequestedProperties requestedProperties;
/** <LIMIT> */
- private int limit;
+ protected int limit;
/** ORDER BY */
- private OrderBy orderBy;
+ protected OrderBy orderBy;
/** indicates, if a limit is defined */
- private boolean limitDefined = false;
+ protected boolean limitDefined = false;
/** the top level expression in the <WHERE> clause */
- private BasicExpression rootExpression;
+ protected BasicExpression rootExpression;
- private BasicExpressionFactory expressionFactory;
-
- /**
- * Constructs a query from the queryString. queryString is an XML
- * document according to the DASL basicsearch specfication.
- *
- * @parameter queryString the search query
- *
- * @throws BadQueryException
- */
- BasicQuery (String queryString, SearchToken token) throws BadQueryException {
+ void setSearchToken (SearchToken token) {
this.searchToken = token;
- try {
- Document doc =
- new SAXBuilder ().build (new StringReader (queryString));
-
- Element root = doc.getRootElement();
- parseQueryElement (root);
- }
- catch (Exception e) {
- e.printStackTrace();
- throw new BadQueryException (e.getMessage());
- }
}
/**
- * Constructs a query from queryElement. queryElement is a DOM
- * element <searchrequest> according to the DASL basicsearch
- * specfication.
- *
- * @parameter queryString the search query
+ * builds the internal structure from the JDOM tree. Concrete implementations
+ * may use parseQueryElementWithoutExpression to create most of the
+ * objects describing the query.
*
- * @throws BadQueryException
- */
- BasicQuery (org.w3c.dom.Element basicSearchElementDOM, SearchToken token)
- throws BadQueryException
- {
- this.searchToken = token;
-
- org.jdom.Element basicSearchElementJDom =
- new DOMBuilder ().build (basicSearchElementDOM);
-
- parseQueryElement (basicSearchElementJDom);
- }
-
-
- /**
- * Constructs a query from queryElement. queryElement is a DOM
- * element <searchrequest> according to the DASL basicsearch
- * specfication.
- *
- * @parameter queryString the search query
+ * @param basicSearchElement an Element
*
- * @throws BadQueryException
+ * @throws BadQueryException
*/
- BasicQuery (Element basicSearchElementJDOM, SearchToken token) throws
BadQueryException {
- this.searchToken = token;
- parseQueryElement (basicSearchElementJDOM);
- }
+ public abstract void parseQueryElement (Element basicSearchElement)
+ throws BadQueryException;
/**
@@ -196,99 +152,18 @@
* @throws ServiceAccessException
*
*/
- public SearchQueryResult execute () throws ServiceAccessException {
- SearchQueryResult result = null;
-
- try {
- requestedResources =
- new RequestedResourcesPoolImpl (searchToken, scope);
-
- Set pool = requestedResources.getPool ();
- rootExpression.resolve (pool);
-
- if (rootExpression.isResolved ()) {
- if (orderBy != null) {
- result = new SearchQueryResult (rootExpression.getResultSet(),
- orderBy.getComparator());
- }
- else {
- result = new SearchQueryResult (rootExpression.getResultSet());
- }
- if (requestedResources.partialResult()) {
- result.setStatus(SearchQueryResult.STATUS_PARTIAL_RESULT);
- result.setDescription ("The server truncated the result set");
- }
- }
- }
-
- catch (InvalidScopeException e) {
- result = new SearchQueryResult ();
- result.setStatus (SearchQueryResult.STATUS_INVALID_SCOPE);
- result.setHref (scope.getHref());
- }
-
- catch (BadQueryException e) { // is this only INVALID_SCOPE?
- result = new SearchQueryResult ();
- result.setStatus (SearchQueryResult.STATUS_BAD_QUERY);
- result.setDescription (e.getMessage());
- result.setHref (scope.getHref());
- }
- finally {
- return result;
- }
- }
-
+ public abstract SearchQueryResult execute () throws ServiceAccessException;
/**
- * QueryScope accessor
- *
- * @return the Scope
- *
- */
- QueryScope getScope () {
- return scope;
- }
-
- /**
- * Method getSelectedProperties
- *
- * @return a SelectedPropertyList
- */
- public RequestedProperties requestedProperties () {
- return requestedProperties;
- }
-
- BasicExpression getExpression () {
- return rootExpression;
- }
-
-
- /**
- * Method isLimitDefined
- *
- * @return true if <limit> was specified
- */
- boolean isLimitDefined () {
- return limitDefined;
- }
-
- /**
- * Method getLimit
- *
- * @return the value of <limit>
- */
- int getLimit () {
- return limit;
- }
-
- /**
- * builds the internal structure from the JDOM tree
+ * builds the internal structure from the JDOM tree. It may be used by the
+ * concrete implementation of BasicQuery. It does NOT create the tree of
+ * Expressions. This must be done in the specific implementation.
*
* @param basicSearchElement an Element
*
* @throws BadQueryException
*/
- private void parseQueryElement (Element basicSearchElement)
+ protected void parseQueryElementWithoutExpression (Element basicSearchElement)
throws BadQueryException
{
if (basicSearchElement == null)
@@ -307,10 +182,11 @@
(Literals.FROM, namespace);
// FROM is mandatory
- if (fromElement == null)
+ if (fromElement == null) {
throw new BadQueryException ("required element <from> not supplied");
+ }
- Element whereElement = basicSearchElement.getChild
+ whereElement = basicSearchElement.getChild
(Literals.WHERE, namespace);
Element orderByElement = basicSearchElement.getChild
@@ -320,31 +196,22 @@
(Literals.LIMIT, namespace);
Element propElement = selectElement.getChild (Literals.PROP, namespace);
- if (propElement == null)
+ if (propElement == null) {
propElement = selectElement.getChild (Literals.ALLPROP, namespace);
+ }
- if (propElement == null)
- throw new BadQueryException ("required element <prop> or <allprop> not
supplied");
+ if (propElement == null) {
+ throw new BadQueryException
+ ("required element <prop> or <allprop> not supplied");
+ }
requestedProperties = new RequestedPropertiesImpl (propElement);
scope = new BasicQueryScope (fromElement);
- if (orderByElement != null)
+ if (orderByElement != null) {
orderBy = new OrderBy (orderByElement);
-
- BasicExpressionFactory expressionFactory
- = getExpressionFactory (scope);
-
- // <where> is not mandatory
- if (whereElement != null) {
- List expressionList = whereElement.getChildren();
-
- rootExpression = expressionFactory.createExpression
- ((Element) expressionList.get (0));
}
- else
- rootExpression = expressionFactory.createExpression (null);
if (limitElement != null) {
limit = new Integer (limitElement.getTextTrim()).intValue();
@@ -354,6 +221,54 @@
/**
+ * QueryScope accessor
+ *
+ * @return the Scope
+ *
+ */
+ QueryScope getScope () {
+ return scope;
+ }
+
+ /**
+ * Method getSelectedProperties
+ *
+ * @return a SelectedPropertyList
+ */
+ public RequestedProperties requestedProperties () {
+ return requestedProperties;
+ }
+
+ /**
+ * Method getExpression
+ *
+ * @return a BasicExpression
+ *
+ */
+ BasicExpression getExpression () {
+ return rootExpression;
+ }
+
+
+ /**
+ * Method isLimitDefined
+ *
+ * @return true if <limit> was specified
+ */
+ boolean isLimitDefined () {
+ return limitDefined;
+ }
+
+ /**
+ * Method getLimit
+ *
+ * @return the value of <limit>
+ */
+ int getLimit () {
+ return limit;
+ }
+
+ /**
* For debugging purpose.
*
* @return this query in string representation
@@ -368,39 +283,52 @@
return result;
}
- private BasicExpressionFactory getExpressionFactory (QueryScope scope) {
- BasicExpressionFactory result = null;
-
- String queryClass = "org.apache.slide.search.basic.BasicExpressionFactory";
-
- // might be null in testsuite
- if (searchToken.getNamespace() != null) {
- Uri uri = new Uri (searchToken.getNamespace(), scope.getHref());
- AbstractStore store = (AbstractStore)uri.getStore();
- String s = (String)
store.getParameter(BasicExpressionFactory.EXPRESSION_FACTORY);
- if (s != null)
- queryClass = s;
- }
-
- try {
- Class factoryClass = Class.forName (queryClass);
- result = (BasicExpressionFactory)factoryClass.newInstance();
- }
- catch (Exception e) {
- throw new SlideRuntimeException (e.getMessage());
- }
-
- return result;
- }
-
-
// for testing
+ /**
+ * Method setPropertyResolver
+ *
+ * @param propertyResolver a RequestedResourcesPool
+ *
+ */
public void setPropertyResolver (RequestedResourcesPool propertyResolver) {
this.requestedResources = propertyResolver;
}
+ /**
+ * Method getPropertyResolver
+ *
+ * @return a RequestedResourcesPool
+ *
+ */
public RequestedResourcesPool getPropertyResolver() {
return requestedResources;
+ }
+
+ /**
+ * Needed to decide, which implementation of BasicQuery to load
+ *
+ * @param basicSearchElementJDOMan Element
+ *
+ * @return a QueryScope
+ *
+ * @throws BadQueryException
+ *
+ */
+ private static QueryScope getScope(Element basicSearchElementJDOM)
+ throws BadQueryException
+ {
+ if (basicSearchElementJDOM == null)
+ throw new BadQueryException ("No query element");
+
+ Namespace namespace = basicSearchElementJDOM.getNamespace();
+ Element fromElement = basicSearchElementJDOM.getChild
+ (Literals.FROM, namespace);
+
+ // FROM is mandatory
+ if (fromElement == null)
+ throw new BadQueryException ("required element <from> not supplied");
+
+ return new BasicQueryScope (fromElement);
}
}
1.7 +7 -7
jakarta-slide/src/share/org/apache/slide/search/basic/BasicSearchLanguage.java
Index: BasicSearchLanguage.java
===================================================================
RCS file:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicSearchLanguage.java,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -r1.6 -r1.7
--- BasicSearchLanguage.java 27 May 2002 08:17:13 -0000 1.6
+++ BasicSearchLanguage.java 31 May 2002 12:23:24 -0000 1.7
@@ -1,7 +1,7 @@
/*
- * $Header:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicSearchLanguage.java,v
1.6 2002/05/27 08:17:13 wam Exp $
- * $Revision: 1.6 $
- * $Date: 2002/05/27 08:17:13 $
+ * $Header:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicSearchLanguage.java,v
1.7 2002/05/31 12:23:24 wam Exp $
+ * $Revision: 1.7 $
+ * $Date: 2002/05/31 12:23:24 $
*
* ====================================================================
*
@@ -74,7 +74,7 @@
* Represent the BasicSearchLanguage for Slide
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Martin Wallmer</a>
- * @version $Revision: 1.6 $
+ * @version $Revision: 1.7 $
*/
public class BasicSearchLanguage extends SearchLanguage {
@@ -116,7 +116,7 @@
public SearchQuery parseQuery (String queryString, SearchToken token)
throws BadQueryException
{
- BasicQuery query = new BasicQuery (queryString, token);
+ BasicQuery query = BasicQueryFactory.newInstance (queryString, token);
return query;
}
@@ -134,7 +134,7 @@
public SearchQuery parseQuery (Element basicSearchElement, SearchToken token)
throws BadQueryException
{
- BasicQuery query = new BasicQuery (basicSearchElement, token);
+ BasicQuery query = BasicQueryFactory.newInstance (basicSearchElement,
token);
return query;
}
@@ -152,7 +152,7 @@
public SearchQuery parseQuery (org.jdom.Element basicSearchElement, SearchToken
token)
throws BadQueryException
{
- BasicQuery query = new BasicQuery (basicSearchElement, token);
+ BasicQuery query = BasicQueryFactory.newInstance (basicSearchElement,
token);
return query;
}
}
1.1
jakarta-slide/src/share/org/apache/slide/search/basic/BasicQueryFactory.java
Index: BasicQueryFactory.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicQueryFactory.java,v
1.1 2002/05/31 12:23:23 wam Exp $
* $Revision: 1.1 $
* $Date: 2002/05/31 12:23:23 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Slide", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.slide.search.basic;
import org.apache.slide.search.SearchToken;
import org.apache.slide.search.QueryScope;
import org.apache.slide.search.SearchQuery;
import org.apache.slide.search.BadQueryException;
import org.apache.slide.search.SearchQueryResult;
import org.apache.slide.common.ServiceAccessException;
import org.apache.slide.common.SlideRuntimeException;
import org.apache.slide.common.RequestedProperties;
import org.apache.slide.common.RequestedPropertiesImpl;
import org.apache.slide.common.Uri;
import org.apache.slide.store.AbstractStore;
import org.jdom.input.DOMBuilder;
import org.jdom.input.SAXBuilder;
import org.jdom.Namespace;
import org.jdom.Element;
import org.jdom.Document;
import java.io.StringReader;
import java.util.List;
import java.util.Set;
/**
* Serves as a factory for store specific implementations of BasicQuery. If the
* parameter "basicQueryClass" is set in the store used for the scope of this
* query, the specified class is loaded. If not specified, the default
* implementaion is used. The loaded class MUST override the abstract class
* BasicQuery.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Martin Wallmer</a>
* @version $Revision: 1.1 $
*/
public abstract class BasicQueryFactory {
/** BasicSearch class */
private static final String BASIC_QUERY_CLASS = "basicQueryClass";
private static final String DEFAULT_QUERY_CLASS =
"org.apache.slide.search.basic.BasicQueryImpl";
/**
* Factory method to create a BasicQuery instance
*
* @param basicSearchElementJDOM describes the query
* @param token the SearchToken
*
* @return a BasicQuery
*
* @throws BadQueryException
*
*/
public static BasicQuery newInstance
(Element basicSearchElementJDOM, SearchToken token)
throws BadQueryException
{
return createQuery (basicSearchElementJDOM, token);
}
// sollte wegschmeissable sein
/**
* Method newInstance
*
* @param basicSearchElementDOMan Element
* @param token a SearchToken
*
* @return a BasicQuery
*
* @throws BadQueryException
*
*/
public static BasicQuery newInstance
(org.w3c.dom.Element basicSearchElementDOM, SearchToken token)
throws BadQueryException
{
org.jdom.Element basicSearchElementJDom =
new DOMBuilder ().build (basicSearchElementDOM);
return createQuery (basicSearchElementJDom, token);
}
/**
* Method newInstance
*
* @param queryString describes the query
* @param token the SearchToken
*
* @return a BasicQuery
*
* @throws BadQueryException
*
*/
public static BasicQuery newInstance
(String queryString, SearchToken token) throws BadQueryException
{
try {
Document doc =
new SAXBuilder ().build (new StringReader (queryString));
Element root = doc.getRootElement();
return createQuery (root, token);
}
catch (Exception e) {
e.printStackTrace();
throw new BadQueryException (e.getMessage());
}
}
private static BasicQuery createQuery (Element basicSearchElementJDOM,
SearchToken token)
throws BadQueryException
{
BasicQuery result = getBasicQueryInstance (getScope
(basicSearchElementJDOM), token);
result.setSearchToken (token);
result.parseQueryElement(basicSearchElementJDOM);
return result;
}
/**
* Needed to decide, which implementation of BasicQuery to load
*
* @param basicSearchElementJDOMan Element
*
* @return a QueryScope
*
* @throws BadQueryException
*
*/
private static QueryScope getScope(Element basicSearchElementJDOM) throws
BadQueryException
{
if (basicSearchElementJDOM == null)
throw new BadQueryException ("No query element");
Namespace namespace = basicSearchElementJDOM.getNamespace();
Element fromElement = basicSearchElementJDOM.getChild
(Literals.FROM, namespace);
// FROM is mandatory
if (fromElement == null)
throw new BadQueryException ("required element <from> not supplied");
return new BasicQueryScope (fromElement);
}
/**
* Instantiates a store specific BasicQuery. If the store-parameter
* "basicQueryClass" is set (via Domain.xml or hard coded), the specified
* class is loaded.
*
* @param scope a QueryScope
* @param searchToken a SearchToken
*
* @return a BasicQuery
*
*/
private static BasicQuery getBasicQueryInstance (QueryScope scope, SearchToken
searchToken) {
BasicQuery result = null;
String className = DEFAULT_QUERY_CLASS;
// might be null in testsuite
if (searchToken.getNamespace() != null) {
Uri uri = new Uri (searchToken.getNamespace(), scope.getHref());
AbstractStore store = (AbstractStore)uri.getStore();
String s = (String) store.getParameter(BASIC_QUERY_CLASS);
if (s != null)
className = s;
}
try {
Class factoryClass = Class.forName (className);
result = (BasicQuery) factoryClass.newInstance();
}
catch (Exception e) {
e.printStackTrace();
throw new SlideRuntimeException (e.getMessage());
}
return result;
}
}
1.1
jakarta-slide/src/share/org/apache/slide/search/basic/BasicQueryImpl.java
Index: BasicQueryImpl.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/BasicQueryImpl.java,v
1.1 2002/05/31 12:23:23 wam Exp $
* $Revision: 1.1 $
* $Date: 2002/05/31 12:23:23 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Slide", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.slide.search.basic;
import org.apache.slide.search.*;
import org.apache.slide.search.SearchQuery;
import org.apache.slide.search.SearchException;
import org.apache.slide.search.BadQueryException;
import org.apache.slide.search.SearchQueryResult;
import org.apache.slide.common.ServiceAccessException;
import org.apache.slide.common.SlideRuntimeException;
import org.apache.slide.common.RequestedProperties;
import org.apache.slide.common.RequestedPropertiesImpl;
import org.apache.slide.common.Uri;
import org.apache.slide.store.AbstractStore;
import org.jdom.input.DOMBuilder;
import org.jdom.input.SAXBuilder;
import org.jdom.Namespace;
import org.jdom.Element;
import org.jdom.Document;
import org.xml.sax.InputSource;
//import org.apache.slide.common.SlideToken;
import java.io.StringReader;
import java.util.List;
import java.util.Set;
/**
* BasicQueryImpl represents the generic (store independent) implementation of
* BasicSearch.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Martin Wallmer</a>
* @version $Revision: 1.1 $
*/
public class BasicQueryImpl extends BasicQuery {
/**
* Executes a request.
*
* @return a SearchQueryResult
*
* @throws ServiceAccessException
*
*/
public SearchQueryResult execute () throws ServiceAccessException {
SearchQueryResult result = null;
try {
requestedResources =
new RequestedResourcesPoolImpl (searchToken, scope);
Set pool = requestedResources.getPool ();
rootExpression.resolve (pool);
if (rootExpression.isResolved ()) {
if (orderBy != null) {
result = new SearchQueryResult (rootExpression.getResultSet(),
orderBy.getComparator());
}
else {
result = new SearchQueryResult (rootExpression.getResultSet());
}
if (requestedResources.partialResult()) {
result.setStatus(SearchQueryResult.STATUS_PARTIAL_RESULT);
result.setDescription ("The server truncated the result set");
}
}
}
catch (InvalidScopeException e) {
result = new SearchQueryResult ();
result.setStatus (SearchQueryResult.STATUS_INVALID_SCOPE);
result.setHref (scope.getHref());
}
catch (BadQueryException e) { // is this only INVALID_SCOPE?
result = new SearchQueryResult ();
result.setStatus (SearchQueryResult.STATUS_BAD_QUERY);
result.setDescription (e.getMessage());
result.setHref (scope.getHref());
}
finally {
return result;
}
}
/**
* builds the internal structure from the JDOM tree
*
* @param basicSearchElement an Element
*
* @throws BadQueryException
*/
public void parseQueryElement (Element basicSearchElement)
throws BadQueryException
{
parseQueryElementWithoutExpression (basicSearchElement);
BasicExpressionFactory expressionFactory = new BasicExpressionFactory ();
// <where> is not mandatory
if (whereElement != null) {
List expressionList = whereElement.getChildren();
rootExpression = expressionFactory.createExpression
((Element) expressionList.get (0));
}
else
rootExpression = expressionFactory.createExpression (null);
}
}
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