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ALF-11032: Load file in to object graph

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Added facility to load an object graph from an XML input stream.



git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@31568 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Matt Ward
2011-10-31 15:14:45 +00:00
parent fa7854a9aa
commit b7c32e2c92
13 changed files with 474 additions and 9 deletions
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220
source/java/org/alfresco/util/schemacomp/XMLToSchema.java Normal file
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/*
* Copyright (C) 2005-2011 Alfresco Software Limited.
*
* This file is part of Alfresco
*
* Alfresco 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 3 of the License, or
* (at your option) any later version.
*
* Alfresco 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 Alfresco. If not, see <http://www.gnu.org/licenses/>.
*/
package org.alfresco.util.schemacomp;
import java.io.IOException;
import java.io.InputStream;
import java.util.Stack;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.alfresco.util.schemacomp.model.Column;
import org.alfresco.util.schemacomp.model.DbObject;
import org.alfresco.util.schemacomp.model.ForeignKey;
import org.alfresco.util.schemacomp.model.Index;
import org.alfresco.util.schemacomp.model.PrimaryKey;
import org.alfresco.util.schemacomp.model.Schema;
import org.alfresco.util.schemacomp.model.Sequence;
import org.alfresco.util.schemacomp.model.Table;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* Parse an XML document representing a database schema.
*
* @author Matt Ward
*/
public class XMLToSchema extends DefaultHandler
{
private SAXParser parser;
private InputStream in;
private Schema schema;
private Stack<DbObject> dboStack = new Stack<DbObject>();
private String lastTag;
private String lastText;
public XMLToSchema(InputStream in, SAXParserFactory saxParserFactory)
{
this.in = in;
try
{
parser = saxParserFactory.newSAXParser();
}
catch (Throwable e)
{
throw new RuntimeException("Cannot create parser.", e);
}
}
public XMLToSchema(InputStream in)
{
this(in, SAXParserFactory.newInstance());
}
public void parse()
{
try
{
parser.parse(in, this);
}
catch (SAXException error)
{
throw new RuntimeException("Unable to parse input stream.", error);
}
catch (IOException error)
{
throw new RuntimeException("Unable to parse input stream.", error);
}
}
public Schema getSchema()
{
return this.schema;
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException
{
if (qName.equals(XML.EL_TABLE))
{
Table table = (Table) dboStack.pop();
schema.add(table);
}
else if (qName.equals(XML.EL_COLUMN))
{
Column column = (Column) dboStack.pop();
Table table = (Table) dboStack.peek();
table.getColumns().add(column);
}
else if (qName.equals(XML.EL_PRIMARY_KEY))
{
PrimaryKey pk = (PrimaryKey) dboStack.pop();
Table table = (Table) dboStack.peek();
table.setPrimaryKey(pk);
}
else if (qName.equals(XML.EL_FOREIGN_KEY))
{
ForeignKey fk = (ForeignKey) dboStack.pop();
Table table = (Table) dboStack.peek();
table.getForeignKeys().add(fk);
}
else if (qName.equals(XML.EL_INDEX))
{
Index index = (Index) dboStack.pop();
Table table = (Table) dboStack.peek();
table.getIndexes().add(index);
}
else if (qName.equals(XML.EL_SEQUENCE))
{
Sequence seq = (Sequence) dboStack.pop();
schema.add(seq);
}
}
@Override
public void startElement(String uri, String localName, String qName, Attributes atts)
throws SAXException
{
lastTag = qName;
if (qName.equals(XML.EL_SCHEMA))
{
schema = new Schema(atts.getValue(XML.ATTR_NAME));
}
else if (qName.equals(XML.EL_TABLE))
{
dboStack.push(new Table(atts.getValue(XML.ATTR_NAME)));
}
else if (qName.equals(XML.EL_COLUMN))
{
dboStack.push(new Column(atts.getValue(XML.ATTR_NAME)));
}
else if (qName.equals(XML.EL_PRIMARY_KEY))
{
dboStack.push(new PrimaryKey(atts.getValue(XML.ATTR_NAME)));
}
else if (qName.equals(XML.EL_FOREIGN_KEY))
{
dboStack.push(new ForeignKey(atts.getValue(XML.ATTR_NAME)));
}
else if (qName.equals(XML.EL_INDEX))
{
dboStack.push(new Index(atts.getValue(XML.ATTR_NAME)));
}
else if (qName.equals(XML.EL_SEQUENCE))
{
dboStack.push(new Sequence(atts.getValue(XML.ATTR_NAME)));
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException
{
lastText = new String(ch, start, length).trim();
if (lastText.length() != 0)
{
if (lastTag.equals(XML.EL_TYPE))
{
Column column = (Column) dboStack.peek();
column.setType(lastText);
}
else if (lastTag.equals(XML.EL_NULLABLE))
{
Column column = (Column) dboStack.peek();
column.setNullable(Boolean.parseBoolean(lastText));
}
else if (lastTag.equals(XML.EL_COLUMN_NAME))
{
if (dboStack.peek() instanceof PrimaryKey)
{
PrimaryKey pk = (PrimaryKey) dboStack.peek();
pk.getColumnNames().add(lastText);
}
else if (dboStack.peek() instanceof Index)
{
Index index = (Index) dboStack.peek();
index.getColumnNames().add(lastText);
}
}
else if (lastTag.equals(XML.EL_LOCAL_COLUMN))
{
ForeignKey fk = (ForeignKey) dboStack.peek();
fk.setLocalColumn(lastText);
}
else if (lastTag.equals(XML.EL_TARGET_TABLE))
{
ForeignKey fk = (ForeignKey) dboStack.peek();
fk.setTargetTable(lastText);
}
else if (lastTag.equals(XML.EL_TARGET_COLUMN))
{
ForeignKey fk = (ForeignKey) dboStack.peek();
fk.setTargetColumn(lastText);
}
}
}
}