/*******************************************************************************
* Copyright 2013 SAP AG
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.sap.core.odata.core.ep.consumer;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import com.sap.core.odata.api.edm.EdmEntitySet;
import com.sap.core.odata.api.edm.EdmException;
import com.sap.core.odata.api.edm.EdmProperty;
import com.sap.core.odata.api.ep.EntityProviderException;
import com.sap.core.odata.api.ep.EntityProviderReadProperties;
import com.sap.core.odata.api.ep.EntityProviderReadProperties.EntityProviderReadPropertiesBuilder;
import com.sap.core.odata.api.ep.entry.ODataEntry;
import com.sap.core.odata.api.ep.feed.ODataFeed;
import com.sap.core.odata.core.ep.aggregator.EntityInfoAggregator;
/**
* Xml entity (content type dependent) consumer for reading input (from <code>content</code>).
*
* @author SAP AG
*/
public class XmlEntityConsumer {
/** Default used charset for reader */
private static final String DEFAULT_CHARSET = "UTF-8";
public XmlEntityConsumer() throws EntityProviderException {
super();
}
public ODataFeed readFeed(final EdmEntitySet entitySet, final InputStream content, final EntityProviderReadProperties properties) throws EntityProviderException {
XMLStreamReader reader = null;
EntityProviderException cachedException = null;
try {
reader = createStaxReader(content);
EntityInfoAggregator eia = EntityInfoAggregator.create(entitySet);
XmlFeedConsumer xfc = new XmlFeedConsumer();
return xfc.readFeed(reader, eia, properties);
} catch (EntityProviderException e) {
cachedException = e;
throw cachedException;
} catch (XMLStreamException e) {
cachedException = new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
throw cachedException;
} finally {// NOPMD (suppress DoNotThrowExceptionInFinally)
if (reader != null) {
try {
reader.close();
} catch (XMLStreamException e) {
if (cachedException != null) {
throw cachedException;
} else {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
}
}
}
}
}
public ODataEntry readEntry(final EdmEntitySet entitySet, final InputStream content, final EntityProviderReadProperties properties) throws EntityProviderException {
XMLStreamReader reader = null;
EntityProviderException cachedException = null;
try {
reader = createStaxReader(content);
EntityInfoAggregator eia = EntityInfoAggregator.create(entitySet);
return new XmlEntryConsumer().readEntry(reader, eia, properties);
} catch (EntityProviderException e) {
cachedException = e;
throw cachedException;
} catch (XMLStreamException e) {
cachedException = new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
throw cachedException;
} finally {// NOPMD (suppress DoNotThrowExceptionInFinally)
if (reader != null) {
try {
reader.close();
} catch (XMLStreamException e) {
if (cachedException != null) {
throw cachedException;
} else {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
}
}
}
}
}
public Map<String, Object> readProperty(final EdmProperty edmProperty, final InputStream content, final EntityProviderReadProperties properties) throws EntityProviderException {
XMLStreamReader reader = null;
EntityProviderException cachedException = null;
XmlPropertyConsumer xec = new XmlPropertyConsumer();
try {
reader = createStaxReader(content);
Map<String, Object> result = xec.readProperty(reader, edmProperty, properties.getMergeSemantic(), properties.getTypeMappings());
return result;
} catch (XMLStreamException e) {
cachedException = new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
throw cachedException;
} finally {// NOPMD (suppress DoNotThrowExceptionInFinally)
if (reader != null) {
try {
reader.close();
} catch (XMLStreamException e) {
if (cachedException != null) {
throw cachedException;
} else {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
}
}
}
}
}
public Object readPropertyValue(final EdmProperty edmProperty, final InputStream content) throws EntityProviderException {
return readPropertyValue(edmProperty, content, null);
}
public Object readPropertyValue(final EdmProperty edmProperty, final InputStream content, final Class<?> typeMapping) throws EntityProviderException {
try {
final Map<String, Object> result;
EntityProviderReadPropertiesBuilder propertiesBuilder = EntityProviderReadProperties.init().mergeSemantic(false);
if (typeMapping == null) {
result = readProperty(edmProperty, content, propertiesBuilder.build());
} else {
Map<String, Object> typeMappings = new HashMap<String, Object>();
typeMappings.put(edmProperty.getName(), typeMapping);
result = readProperty(edmProperty, content, propertiesBuilder.addTypeMappings(typeMappings).build());
}
return result.get(edmProperty.getName());
} catch (EdmException e) {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
}
}
public String readLink(final EdmEntitySet entitySet, final Object content) throws EntityProviderException {
XMLStreamReader reader = null;
EntityProviderException cachedException = null;
XmlLinkConsumer xlc = new XmlLinkConsumer();
try {
reader = createStaxReader(content);
return xlc.readLink(reader, entitySet);
} catch (XMLStreamException e) {
cachedException = new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
throw cachedException;
} finally {// NOPMD (suppress DoNotThrowExceptionInFinally)
if (reader != null) {
try {
reader.close();
} catch (XMLStreamException e) {
if (cachedException != null) {
throw cachedException;
} else {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
}
}
}
}
}
public List<String> readLinks(final EdmEntitySet entitySet, final Object content) throws EntityProviderException {
XMLStreamReader reader = null;
EntityProviderException cachedException = null;
XmlLinkConsumer xlc = new XmlLinkConsumer();
try {
reader = createStaxReader(content);
return xlc.readLinks(reader, entitySet);
} catch (XMLStreamException e) {
cachedException = new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
throw cachedException;
} finally {// NOPMD (suppress DoNotThrowExceptionInFinally)
if (reader != null) {
try {
reader.close();
} catch (XMLStreamException e) {
if (cachedException != null) {
throw cachedException;
} else {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass().getSimpleName()), e);
}
}
}
}
}
private XMLStreamReader createStaxReader(final Object content) throws XMLStreamException, EntityProviderException {
XMLInputFactory factory = XMLInputFactory.newInstance();
factory.setProperty(XMLInputFactory.IS_VALIDATING, false);
factory.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, true);
if (content == null) {
throw new EntityProviderException(EntityProviderException.ILLEGAL_ARGUMENT
.addContent("Got not supported NULL object as content to de-serialize."));
}
if (content instanceof InputStream) {
XMLStreamReader streamReader = factory.createXMLStreamReader((InputStream) content, DEFAULT_CHARSET);
// verify charset encoding set in content is supported (if not set UTF-8 is used as defined in 'http://www.w3.org/TR/2008/REC-xml-20081126/')
String characterEncodingInContent = streamReader.getCharacterEncodingScheme();
if (characterEncodingInContent != null && !DEFAULT_CHARSET.equalsIgnoreCase(characterEncodingInContent)) {
throw new EntityProviderException(EntityProviderException.UNSUPPORTED_CHARACTER_ENCODING.addContent(characterEncodingInContent));
}
return streamReader;
}
throw new EntityProviderException(EntityProviderException.ILLEGAL_ARGUMENT
.addContent("Found not supported content of class '" + content.getClass() + "' to de-serialize."));
}
}