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April 8, 2015 13:53
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/** | |
* Licensed to the Apache Software Foundation (ASF) under one or more | |
* contributor license agreements. See the NOTICE file distributed with | |
* this work for additional information regarding copyright ownership. | |
* The ASF licenses this file to You 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 org.apache.camel.dataformat.xstream; | |
import java.io.InputStream; | |
import java.io.OutputStream; | |
import java.lang.reflect.Constructor; | |
import java.lang.reflect.Method; | |
import java.util.List; | |
import java.util.Map; | |
import java.util.Map.Entry; | |
import javax.xml.stream.XMLStreamException; | |
import com.thoughtworks.xstream.XStream; | |
import com.thoughtworks.xstream.converters.Converter; | |
import com.thoughtworks.xstream.io.HierarchicalStreamDriver; | |
import com.thoughtworks.xstream.io.HierarchicalStreamReader; | |
import com.thoughtworks.xstream.io.HierarchicalStreamWriter; | |
import org.apache.camel.Exchange; | |
import org.apache.camel.converter.jaxp.StaxConverter; | |
import org.apache.camel.spi.ClassResolver; | |
import org.apache.camel.spi.DataFormat; | |
import org.apache.camel.util.ObjectHelper; | |
/** | |
* An abstract class which implement <a href="http://camel.apache.org/data-format.html">data format</a> | |
* ({@link DataFormat}) interface which leverage the XStream library for XML or JSON's marshaling and unmarshaling | |
*/ | |
public abstract class AbstractXStreamWrapper implements DataFormat { | |
private XStream xstream; | |
private HierarchicalStreamDriver xstreamDriver; | |
private StaxConverter staxConverter; | |
private List<String> converters; | |
private Map<String, String> aliases; | |
private Map<String, String[]> omitFields; | |
private Map<String, String[]> implicitCollections; | |
private String mode; | |
public AbstractXStreamWrapper() { | |
} | |
public AbstractXStreamWrapper(XStream xstream) { | |
this.xstream = xstream; | |
} | |
/** | |
* Resolves the XStream instance to be used by this data format. If XStream is not explicitly set, new instance will | |
* be created and cached. | |
* | |
* @param resolver class resolver to be used during a configuration of the XStream instance. | |
* @return XStream instance used by this data format. | |
*/ | |
public XStream getXStream(ClassResolver resolver) { | |
if (xstream == null) { | |
xstream = createXStream(resolver); | |
} | |
return xstream; | |
} | |
public void setXStream(XStream xstream) { | |
this.xstream = xstream; | |
} | |
protected XStream createXStream(ClassResolver resolver) { | |
if (xstreamDriver != null) { | |
xstream = new XStream(xstreamDriver); | |
} else { | |
xstream = new XStream(); | |
} | |
if (mode != null) { | |
xstream.setMode(getModeFromString(mode)); | |
} | |
try { | |
if (this.implicitCollections != null) { | |
for (Entry<String, String[]> entry : this.implicitCollections.entrySet()) { | |
for (String name : entry.getValue()) { | |
xstream.addImplicitCollection(resolver.resolveMandatoryClass(entry.getKey()), name); | |
} | |
} | |
} | |
if (this.aliases != null) { | |
for (Entry<String, String> entry : this.aliases.entrySet()) { | |
xstream.alias(entry.getKey(), resolver.resolveMandatoryClass(entry.getValue())); | |
// It can turn the auto-detection mode off | |
xstream.processAnnotations(resolver.resolveMandatoryClass(entry.getValue())); | |
} | |
} | |
if (this.omitFields != null) { | |
for (Entry<String, String[]> entry : this.omitFields.entrySet()) { | |
for (String name : entry.getValue()) { | |
xstream.omitField(resolver.resolveMandatoryClass(entry.getKey()), name); | |
} | |
} | |
} | |
if (this.converters != null) { | |
for (String name : this.converters) { | |
Class<Converter> converterClass = resolver.resolveMandatoryClass(name, Converter.class); | |
Converter converter; | |
Constructor<Converter> con = null; | |
try { | |
con = converterClass.getDeclaredConstructor(new Class[]{XStream.class}); | |
} catch (Exception e) { | |
//swallow as we null check in a moment. | |
} | |
if (con != null) { | |
converter = con.newInstance(xstream); | |
} else { | |
converter = converterClass.newInstance(); | |
try { | |
Method method = converterClass.getMethod("setXStream", new Class[]{XStream.class}); | |
if (method != null) { | |
ObjectHelper.invokeMethod(method, converter, xstream); | |
} | |
} catch (Throwable e) { | |
// swallow, as it just means the user never add an XStream setter, which is optional | |
} | |
} | |
xstream.registerConverter(converter); | |
} | |
} | |
} catch (Exception e) { | |
throw new RuntimeException("Unable to build XStream instance", e); | |
} | |
return xstream; | |
} | |
protected int getModeFromString(String modeString) { | |
int result; | |
if ("NO_REFERENCES".equalsIgnoreCase(modeString)) { | |
result = XStream.NO_REFERENCES; | |
} else if ("ID_REFERENCES".equalsIgnoreCase(modeString)) { | |
result = XStream.ID_REFERENCES; | |
} else if ("XPATH_RELATIVE_REFERENCES".equalsIgnoreCase(modeString)) { | |
result = XStream.XPATH_RELATIVE_REFERENCES; | |
} else if ("XPATH_ABSOLUTE_REFERENCES".equalsIgnoreCase(modeString)) { | |
result = XStream.XPATH_ABSOLUTE_REFERENCES; | |
} else if ("SINGLE_NODE_XPATH_RELATIVE_REFERENCES".equalsIgnoreCase(modeString)) { | |
result = XStream.SINGLE_NODE_XPATH_RELATIVE_REFERENCES; | |
} else if ("SINGLE_NODE_XPATH_ABSOLUTE_REFERENCES".equalsIgnoreCase(modeString)) { | |
result = XStream.SINGLE_NODE_XPATH_ABSOLUTE_REFERENCES; | |
} else { | |
throw new IllegalArgumentException("Unknown mode : " + modeString); | |
} | |
return result; | |
} | |
public StaxConverter getStaxConverter() { | |
if (staxConverter == null) { | |
staxConverter = new StaxConverter(); | |
} | |
return staxConverter; | |
} | |
public void setStaxConverter(StaxConverter staxConverter) { | |
this.staxConverter = staxConverter; | |
} | |
public List<String> getConverters() { | |
return converters; | |
} | |
public void setConverters(List<String> converters) { | |
this.converters = converters; | |
} | |
public Map<String, String> getAliases() { | |
return aliases; | |
} | |
public void setAliases(Map<String, String> aliases) { | |
this.aliases = aliases; | |
} | |
public Map<String, String[]> getImplicitCollections() { | |
return implicitCollections; | |
} | |
public void setImplicitCollections(Map<String, String[]> implicitCollections) { | |
this.implicitCollections = implicitCollections; | |
} | |
public Map<String, String[]> getOmitFields() { | |
return omitFields; | |
} | |
public void setOmitFields(Map<String, String[]> omitFields) { | |
this.omitFields = omitFields; | |
} | |
public HierarchicalStreamDriver getXstreamDriver() { | |
return xstreamDriver; | |
} | |
public void setXstreamDriver(HierarchicalStreamDriver xstreamDriver) { | |
this.xstreamDriver = xstreamDriver; | |
} | |
public String getMode() { | |
return mode; | |
} | |
public void setMode(String mode) { | |
this.mode = mode; | |
} | |
public XStream getXstream() { | |
return xstream; | |
} | |
public void setXstream(XStream xstream) { | |
this.xstream = xstream; | |
} | |
public void marshal(Exchange exchange, Object body, OutputStream stream) throws Exception { | |
HierarchicalStreamWriter writer = createHierarchicalStreamWriter(exchange, body, stream); | |
try { | |
getXStream(exchange.getContext().getClassResolver()).marshal(body, writer); | |
} finally { | |
writer.close(); | |
} | |
} | |
public Object unmarshal(Exchange exchange, InputStream stream) throws Exception { | |
HierarchicalStreamReader reader = createHierarchicalStreamReader(exchange, stream); | |
try { | |
return getXStream(exchange.getContext().getClassResolver()).unmarshal(reader); | |
} finally { | |
reader.close(); | |
} | |
} | |
protected abstract HierarchicalStreamWriter createHierarchicalStreamWriter( | |
Exchange exchange, Object body, OutputStream stream) throws XMLStreamException; | |
protected abstract HierarchicalStreamReader createHierarchicalStreamReader( | |
Exchange exchange, InputStream stream) throws XMLStreamException; | |
} |
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