001// Copyright 2011 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007// http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.jpa;
016
017import org.apache.tapestry5.ioc.internal.util.InternalUtils;
018import org.apache.tapestry5.jpa.TapestryPersistenceUnitInfo;
019import org.xml.sax.InputSource;
020import org.xml.sax.XMLReader;
021import org.xml.sax.helpers.XMLReaderFactory;
022
023import java.io.InputStream;
024import java.util.List;
025
026public class PersistenceParser
027{
028
029    public List<TapestryPersistenceUnitInfo> parse(final InputStream stream)
030    {
031
032        final PersistenceContentHandler handler = new PersistenceContentHandler();
033
034        try
035        {
036            final XMLReader reader = XMLReaderFactory.createXMLReader();
037
038            reader.setContentHandler(handler);
039
040            reader.parse(new InputSource(stream));
041
042            return handler.getPersistenceUnits();
043
044        }
045        catch (final Exception e)
046        {
047            throw new RuntimeException(e);
048        }
049        finally
050        {
051            InternalUtils.close(stream);
052        }
053    }
054
055}