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eXist-db NoSQL Database Core
/*
* eXist-db Open Source Native XML Database
* Copyright (C) 2001 The eXist-db Authors
*
* [email protected]
* http://www.exist-db.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.exist.client;
import java.io.IOException;
import java.util.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.exist.collections.CollectionConfiguration;
import org.exist.collections.CollectionConfigurationManager;
import org.apache.commons.io.input.UnsynchronizedByteArrayInputStream;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.xmldb.api.base.Collection;
import org.xmldb.api.base.Resource;
import org.xmldb.api.base.XMLDBException;
import org.xmldb.api.modules.BinaryResource;
/**
* Class to represent a collection.xconf which holds the configuration data for a collection
*
* @author Adam Retter
* @serial 2006-08-25
* @version 1.2
*/
public class CollectionXConf
{
public final static String TYPE_QNAME = "qname";
public final static String TYPE_PATH = "path";
private InteractiveClient client = null; //the client
private String path = null; //path of the collection.xconf file
Collection collection = null; //the configuration collection
Resource resConfig = null; //the collection.xconf resource
private LinkedHashMap customNamespaces = null; //custom namespaces
private RangeIndex[] rangeIndexes = null; //range indexes model
private Trigger[] triggers = null; //triggers model
private boolean hasChanged = false; //indicates if changes have been made to the current collection configuration
/**
* Constructor
*
* @param CollectionName The path of the collection to retreive the collection.xconf for
* @param client The interactive client
*/
CollectionXConf(String CollectionName, InteractiveClient client) throws XMLDBException
{
this.client = client;
//get configuration collection for the named collection
//TODO : use XmldbURIs
path = CollectionConfigurationManager.CONFIG_COLLECTION + CollectionName;
collection = client.getCollection(path);
if(collection == null) //if no config collection for this collection exists, just return
{return;}
//get the resource from the db
final String[] resources = collection.listResources();
for (String resource : resources) {
if (resource.endsWith(CollectionConfiguration.COLLECTION_CONFIG_SUFFIX)) {
resConfig = collection.getResource(resource);
if (resConfig.getResourceType().equals(BinaryResource.RESOURCE_TYPE)) {
System.err.println("Found a possible Collection configuration document: " + resConfig.getId() + ", however it is a Binary document! A user may have stored the document as a Binary document by mistake. Skipping...");
continue;
}
break;
}
}
if(resConfig == null) //if, no config file exists for that collection
{return;}
//Parse the configuration file into a DOM
final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Document docConfig = null;
try
{
final DocumentBuilder builder = factory.newDocumentBuilder();
docConfig = builder.parse( new UnsynchronizedByteArrayInputStream(resConfig.getContent().toString().getBytes()) );
}
catch(final ParserConfigurationException | SAXException | IOException pce)
{
//TODO: do something here, throw exception?
}
//Get the root of the collection.xconf
final Element xconf = docConfig.getDocumentElement();
//Read any custom namespaces from xconf
customNamespaces = getCustomNamespaces(xconf);
//Read Range Indexes from xconf
rangeIndexes = getRangeIndexes(xconf);
//read Triggers from xconf
triggers = getTriggers(xconf);
}
/**
* Returns an array of the Range Indexes
*
* @return Array of Range Indexes
*/
public RangeIndex[] getRangeIndexes()
{
return rangeIndexes;
}
/**
* Returns n specific Range Index
*
* @param index The numeric index of the Range Index to return
*
* @return The Range Index
*/
public RangeIndex getRangeIndex(int index)
{
return rangeIndexes[index];
}
/**
* Returns the number of Range Indexes defined
*
* @return The number of Range indexes
*/
public int getRangeIndexCount()
{
if(rangeIndexes != null)
{
return rangeIndexes.length;
}
else
{
return 0;
}
}
/**
* Delete a Range Index
*
* @param index The numeric index of the Range Index to delete
*/
public void deleteRangeIndex(int index)
{
//can only remove an index which is in the array
if(index < rangeIndexes.length)
{
hasChanged = true;
//if its the last item in the array just null the array
if(rangeIndexes.length == 1)
{
rangeIndexes = null;
}
else
{
//else remove the item at index from the array
RangeIndex newRangeIndexes[] = new RangeIndex[rangeIndexes.length - 1];
int x = 0;
for(int i = 0; i < rangeIndexes.length; i++)
{
if(i != index)
{
newRangeIndexes[x] = rangeIndexes[i];
x++;
}
}
rangeIndexes = newRangeIndexes;
}
}
}
/**
* Update the details of a Range Index
*
* @param index The numeric index of the range index to update
* @param type The type of the index, either {@link #TYPE_PATH} or {@link #TYPE_QNAME}
* @param XPath The new XPath, or null to just set the type
* @param xsType The new type of the path, a valid xs:type, or just null to set the path
*/
public void updateRangeIndex(int index, String type, String XPath, String xsType)
{
hasChanged = true;
if (type != null)
{rangeIndexes[index].setType(type);}
if(XPath != null)
{rangeIndexes[index].setXPath(XPath);}
if(xsType != null)
{rangeIndexes[index].setxsType(xsType);}
}
/**
* Add a Range Index
*
* @param type The type of the index, either {@link #TYPE_PATH} or {@link #TYPE_QNAME}
* @param XPath The XPath to index
* @param xsType The type of the path, a valid xs:type
*/
public void addRangeIndex(String type, String XPath, String xsType)
{
hasChanged = true;
if(rangeIndexes == null)
{
rangeIndexes = new RangeIndex[1];
rangeIndexes[0] = new RangeIndex(type, XPath, xsType);
}
else
{
RangeIndex newRangeIndexes[] = new RangeIndex[rangeIndexes.length + 1];
System.arraycopy(rangeIndexes, 0, newRangeIndexes, 0, rangeIndexes.length);
newRangeIndexes[rangeIndexes.length] = new RangeIndex(type, XPath, xsType);
rangeIndexes = newRangeIndexes;
}
}
/**
* Returns an array of Triggers
*
* @return Array of Range Indexes
*/
public Trigger[] getTriggers()
{
return triggers;
}
/**
* Returns n specific Trigger
*
* @param index The numeric index of the Trigger to return
*
* @return The Trigger
*/
public Trigger getTrigger(int index)
{
return triggers[index];
}
/**
* Returns the number of Triggers defined
*
* @return The number of Triggers
*/
public int getTriggerCount()
{
if(triggers != null)
{
return triggers.length;
}
else
{
return 0;
}
}
/**
* Delete a Trigger
*
* @param index The numeric index of the Trigger to delete
*/
public void deleteTrigger(int index)
{
//can only remove an index which is in the array
if(index < triggers.length)
{
hasChanged = true;
//if its the last item in the array just null the array
if(triggers.length == 1)
{
triggers = null;
}
else
{
//else remove the item at index from the array
Trigger newTriggers[] = new Trigger[triggers.length - 1];
int x = 0;
for(int i = 0; i < triggers.length; i++)
{
if(i != index)
{
newTriggers[x] = triggers[i];
x++;
}
}
triggers = newTriggers;
}
}
}
/**
* Update the details of a Trigger
*
* @param index The numeric index of the range index to update
* @param triggerClass The name of the new class for the trigger
* @param parameters The parameters to the trigger
*
*/
public void updateTrigger(int index, String triggerClass, Properties parameters)
{
//TODO: finish this!!! - need to add code for parameters
hasChanged = true;
if(triggerClass != null) {
triggers[index].setTriggerClass(triggerClass);
}
}
/**
* Add a Trigger
*
* @param triggerClass The class for the Trigger
* @param parameters Parameters to pass to trigger
*
*/
public void addTrigger(String triggerClass, Properties parameters)
{
//TODO: finish this!!! seee updateTrigger
hasChanged = true;
if(triggers == null)
{
triggers = new Trigger[1];
triggers[0] = new Trigger(triggerClass, parameters);
}
else
{
Trigger newTriggers[] = new Trigger[triggers.length + 1];
System.arraycopy(triggers, 0, newTriggers, 0, triggers.length);
newTriggers[triggers.length] = new Trigger(triggerClass, parameters);
triggers = newTriggers;
}
}
private LinkedHashMap getCustomNamespaces(Element xconf)
{
final NamedNodeMap attrs = xconf.getAttributes();
//there will always be one attribute - the default namespace
if(attrs.getLength() > 1)
{
final LinkedHashMap namespaces = new LinkedHashMap<>();
for(int i = 0; i < attrs.getLength(); i++)
{
final Node a = attrs.item(i);
if(a.getNodeName().startsWith("xmlns:"))
{
final String namespaceLocalName = a.getNodeName().substring(a.getNodeName().indexOf(':')+1);
namespaces.put(namespaceLocalName, a.getNodeValue());
}
}
return namespaces;
}
return null;
}
//given the root element of collection.xconf it will return an array of range indexes
private RangeIndex[] getRangeIndexes(Element xconf)
{
final NodeList nlRangeIndexes = xconf.getElementsByTagName("create");
if(nlRangeIndexes.getLength() > 0)
{
final List rl = new ArrayList<>();
for(int i = 0; i < nlRangeIndexes.getLength(); i++)
{
final Element rangeIndex = (Element)nlRangeIndexes.item(i);
if (rangeIndex.hasAttribute("type")) {
if (rangeIndex.hasAttribute("qname"))
{rl.add(new RangeIndex(TYPE_QNAME, rangeIndex.getAttribute("qname"), rangeIndex.getAttribute("type")));}
else
{rl.add(new RangeIndex(TYPE_PATH, rangeIndex.getAttribute("path"), rangeIndex.getAttribute("type")));}
}
}
RangeIndex[] rangeIndexes = new RangeIndex[rl.size()];
rangeIndexes = rl.toArray(rangeIndexes);
return rangeIndexes;
}
return null;
}
//given the root element of collection.xconf it will return an array of triggers
private Trigger[] getTriggers(Element xconf)
{
final NodeList nlTriggers = xconf.getElementsByTagName("trigger");
if(nlTriggers.getLength() > 0)
{
final Trigger[] triggers = new Trigger[nlTriggers.getLength()];
for(int i = 0; i < nlTriggers.getLength(); i++)
{
final Element trigger = (Element)nlTriggers.item(i);
final Properties parameters = new Properties();
final NodeList nlTriggerParameters = trigger.getElementsByTagName("parameter");
if(nlTriggerParameters.getLength() > 0)
{
for(int x = 0; x < nlTriggerParameters.getLength(); x++)
{
final Element parameter = (Element)nlTriggerParameters.item(x);
parameters.setProperty(parameter.getAttribute("name"), parameter.getAttribute("value"));
}
}
//create the trigger
triggers[i] = new Trigger(trigger.getAttribute("class"), parameters);
}
return triggers;
}
return null;
}
//has the collection.xconf been modified?
/**
* Indicates whether the collection configuration has changed
*
* @return true if the configuration has changed, false otherwise
*/
public boolean hasChanged()
{
return hasChanged;
}
//produces a string of XML describing the collection.xconf
private String toXMLString()
{
final StringBuilder xconf = new StringBuilder();
xconf.append(" entry : customNamespaces.entrySet())
{
xconf.append(" ");
final String namespaceLocalName = entry.getKey();
final String namespaceURL = entry.getValue();
xconf.append("xmlns:").append(namespaceLocalName).append("=\"").append(namespaceURL).append("\"");
}
}
xconf.append(">");
xconf.append(System.getProperty("line.separator"));
//index
if(rangeIndexes != null)
{
xconf.append('\t');
xconf.append("");
xconf.append(System.getProperty("line.separator"));
//range indexes
if(rangeIndexes != null)
{
for (RangeIndex rangeIndex : rangeIndexes) {
xconf.append("\t\t\t");
xconf.append(rangeIndex.toXMLString());
xconf.append(System.getProperty("line.separator"));
}
}
xconf.append('\t');
xconf.append(" ");
xconf.append(System.getProperty("line.separator"));
}
//triggers
if(triggers != null)
{
xconf.append('\t');
xconf.append("");
for (Trigger trigger : triggers) {
xconf.append("\t\t\t");
xconf.append(trigger.toXMLString());
xconf.append(System.getProperty("line.separator"));
}
xconf.append('\t');
xconf.append(" ");
xconf.append(System.getProperty("line.separator"));
}
xconf.append(" ");
return xconf.toString();
}
/**
* Saves the collection configuation back to the collection.xconf
*
* @return true if the save succeeds, false otherwise
*/
public boolean Save()
{
try
{
//is there an existing config file?
if(resConfig == null)
{
//no
//is there an existing configuration collection?
if(collection == null)
{
//no
client.process("mkcol " + path);
collection = client.getCollection(path);
}
resConfig = collection.createResource(CollectionConfiguration.DEFAULT_COLLECTION_CONFIG_FILE, "XMLResource");
}
//set the content of the collection.xconf
resConfig.setContent(toXMLString());
//store the collection.xconf
collection.storeResource(resConfig);
}
catch(final XMLDBException xmldbe)
{
return false;
}
return true;
}
/**
* Represents a Range Index in the collection.xconf
*/
protected class RangeIndex
{
private String type = TYPE_QNAME;
private String XPath = null;
private String xsType = null;
/**
* Constructor
*
* @param type type of the index, either "qname" or "path"
* @param XPath The XPath to create a range index on
* @param xsType The data type pointed to by the XPath as an xs:type
*/
RangeIndex(String type, String XPath, String xsType)
{
this.type = type;
this.XPath = XPath;
this.xsType = xsType;
}
public String getXPath()
{
return(XPath);
}
public String getxsType()
{
return(xsType);
}
public String getType() {
return type;
}
public void setXPath(String XPath)
{
this.XPath = XPath;
}
public void setxsType(String xsType)
{
this.xsType = xsType;
}
public void setType(String type) {
this.type = type;
}
//produces a collection.xconf suitable string of XML describing the range index
protected String toXMLString()
{
final StringBuilder range = new StringBuilder();
if (TYPE_PATH.equals(type))
{range.append("");
//parameters if any
if(parameters != null)
{
if(parameters.size() > 0)
{
for (Object o : parameters.keySet()) {
final String name = (String) o;
final String value = parameters.getProperty(name);
trigger.append(" ");
}
return trigger.toString();
}
}
}
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