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* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.xml.internal.bind.v2.runtime.reflect;
import java.io.IOException;
import java.util.concurrent.Callable;
import javax.xml.bind.JAXBException;
import javax.xml.bind.annotation.XmlValue;
import javax.xml.stream.XMLStreamException;
import com.sun.istack.internal.NotNull;
import com.sun.istack.internal.Nullable;
import com.sun.istack.internal.SAXException2;
import com.sun.xml.internal.bind.WhiteSpaceProcessor;
import com.sun.xml.internal.bind.api.AccessorException;
import com.sun.xml.internal.bind.v2.model.core.ID;
import com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder;
import com.sun.xml.internal.bind.v2.model.nav.Navigator;
import com.sun.xml.internal.bind.v2.model.runtime.RuntimeNonElementRef;
import com.sun.xml.internal.bind.v2.model.runtime.RuntimePropertyInfo;
import com.sun.xml.internal.bind.v2.runtime.Name;
import com.sun.xml.internal.bind.v2.runtime.Transducer;
import com.sun.xml.internal.bind.v2.runtime.XMLSerializer;
import com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl;
import com.sun.xml.internal.bind.v2.runtime.reflect.opt.OptimizedTransducedAccessorFactory;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.Patcher;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.LocatorEx;
import org.xml.sax.SAXException;
/**
* {@link Accessor} and {@link Transducer} combined into one object.
*
* <p>
* This allows efficient conversions between primitive values and
* String without using boxing.
*
* <p>
* This abstraction only works for a single-value property.
*
* <p>
* An instance of {@link TransducedAccessor} implicitly holds a
* field of the {@code BeanT} that the accessors access.
*
* @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
*/
public abstract class TransducedAccessor<BeanT> {
/**
* @see Transducer#useNamespace()
*/
public boolean useNamespace() {
return false;
}
/**
* Obtain the value of the field and declares the namespace URIs used in
* the value.
*
* @see Transducer#declareNamespace(Object, XMLSerializer)
*/
public void declareNamespace( BeanT o, XMLSerializer w ) throws AccessorException, SAXException {
}
/**
* Prints the responsible field of the given bean to the writer.
*
* <p>
* Use {@link XMLSerializer#getInstance()} to access to the namespace bindings
*
* @return
* if the accessor didn't yield a value, return null.
*/
public abstract @Nullable CharSequence print(@NotNull BeanT o) throws AccessorException, SAXException;
/**
* Parses the text value into the responsible field of the given bean.
*
* <p>
* Use {@link UnmarshallingContext#getInstance()} to access to the namespace bindings
*
* @throws AccessorException
* if the transducer is used to parse an user bean that uses {@link XmlValue},
* then this exception may occur when it tries to set the leaf value to the bean.
* @throws RuntimeException
* if the lexical form is incorrect. The method may throw a RuntimeException,
* but it shouldn't cause the entire unmarshalling to fail.
* @throws SAXException
* if the parse method found an error, the error is reported, and then
* the processing is aborted.
*/
public abstract void parse(BeanT o, CharSequence lexical) throws AccessorException, SAXException;
/**
* Checks if the field has a value.
*/
public abstract boolean hasValue(BeanT o) throws AccessorException;
/**
* Gets the {@link TransducedAccessor} appropriately configured for
* the given property.
*
* <p>
* This allows the implementation to use an optimized code.
*/
public static <T> TransducedAccessor<T> get(JAXBContextImpl context, RuntimeNonElementRef ref) {
Transducer xducer = RuntimeModelBuilder.createTransducer(ref);
RuntimePropertyInfo prop = ref.getSource();
if(prop.isCollection()) {
return new ListTransducedAccessorImpl(xducer,prop.getAccessor(),
Lister.create(Navigator.REFLECTION.erasure(prop.getRawType()),prop.id(),
prop.getAdapter()));
}
if(prop.id()==ID.IDREF)
return new IDREFTransducedAccessorImpl(prop.getAccessor());
if(xducer.isDefault() && !context.fastBoot) {
TransducedAccessor xa = OptimizedTransducedAccessorFactory.get(prop);
if(xa!=null) return xa;
}
if(xducer.useNamespace())
return new CompositeContextDependentTransducedAccessorImpl( context, xducer, prop.getAccessor() );
else
return new CompositeTransducedAccessorImpl( context, xducer, prop.getAccessor() );
}
/**
* Convenience method to write the value as a text inside an element
* without any attributes.
* Can be overridden for improved performance.
*
* <p>
* The callee assumes that there's an associated value in the field.
* No @xsi:type handling is expected.
*/
public abstract void writeLeafElement(XMLSerializer w, Name tagName, BeanT o, String fieldName) throws SAXException, AccessorException, IOException, XMLStreamException;
/**
* Invokes one of the {@link XMLSerializer#text(String, String)} method
* with the representation of data bested suited for this transduced accessor.
*/
public abstract void writeText(XMLSerializer w, BeanT o, String fieldName) throws AccessorException, SAXException, IOException, XMLStreamException;
static class CompositeContextDependentTransducedAccessorImpl<BeanT,ValueT> extends CompositeTransducedAccessorImpl<BeanT,ValueT> {
public CompositeContextDependentTransducedAccessorImpl(JAXBContextImpl context,Transducer<ValueT> xducer, Accessor<BeanT,ValueT> acc) {
super(context,xducer,acc);
assert xducer.useNamespace();
}
public boolean useNamespace() {
return true;
}
public void declareNamespace(BeanT bean, XMLSerializer w) throws AccessorException {
ValueT o = acc.get(bean);
if(o!=null)
xducer.declareNamespace(o,w);
}
@Override
public void writeLeafElement(XMLSerializer w, Name tagName, BeanT o, String fieldName) throws SAXException, AccessorException, IOException, XMLStreamException {
w.startElement(tagName,null);
declareNamespace(o,w);
w.endNamespaceDecls(null);
w.endAttributes();
xducer.writeText(w,acc.get(o),fieldName);
w.endElement();
}
}
/**
* Implementation of {@link TransducedAccessor} that
* simply combines a {@link Transducer} and {@link Accessor}.
*/
static class CompositeTransducedAccessorImpl<BeanT,ValueT> extends TransducedAccessor<BeanT> {
protected final Transducer<ValueT> xducer;
protected final Accessor<BeanT,ValueT> acc;
public CompositeTransducedAccessorImpl(JAXBContextImpl context, Transducer<ValueT> xducer, Accessor<BeanT,ValueT> acc) {
this.xducer = xducer;
this.acc = acc.optimize(context);
}
public CharSequence print(BeanT bean) throws AccessorException {
ValueT o = acc.get(bean);
if(o==null) return null;
return xducer.print(o);
}
public void parse(BeanT bean, CharSequence lexical) throws AccessorException, SAXException {
acc.set(bean,xducer.parse(lexical));
}
public boolean hasValue(BeanT bean) throws AccessorException {
return acc.getUnadapted(bean)!=null;
}
@Override
public void writeLeafElement(XMLSerializer w, Name tagName, BeanT o, String fieldName) throws SAXException, AccessorException, IOException, XMLStreamException {
xducer.writeLeafElement(w,tagName,acc.get(o),fieldName);
}
@Override
public void writeText(XMLSerializer w, BeanT o, String fieldName) throws AccessorException, SAXException, IOException, XMLStreamException {
xducer.writeText(w,acc.get(o),fieldName);
}
}
/**
* {@link TransducedAccessor} for IDREF.
*
* BeanT: the type of the bean that contains this the IDREF field.
* TargetT: the type of the bean pointed by IDREF.
*/
private static final class IDREFTransducedAccessorImpl<BeanT,TargetT> extends DefaultTransducedAccessor<BeanT> {
private final Accessor<BeanT,TargetT> acc;
/**
* The object that an IDREF resolves to should be
* assignable to this type.
*/
private final Class<TargetT> targetType;
public IDREFTransducedAccessorImpl(Accessor<BeanT, TargetT> acc) {
this.acc = acc;
this.targetType = acc.getValueType();
}
public String print(BeanT bean) throws AccessorException, SAXException {
TargetT target = acc.get(bean);
if(target==null) return null;
XMLSerializer w = XMLSerializer.getInstance();
try {
String id = w.grammar.getBeanInfo(target,true).getId(target,w);
if(id==null)
w.errorMissingId(target);
return id;
} catch (JAXBException e) {
w.reportError(null,e);
return null;
}
}
private void assign( BeanT bean, TargetT t, UnmarshallingContext context ) throws AccessorException {
if(!targetType.isInstance(t))
context.handleError(Messages.UNASSIGNABLE_TYPE.format(targetType,t.getClass()));
else
acc.set(bean,t);
}
public void parse(final BeanT bean, CharSequence lexical) throws AccessorException, SAXException {
final String idref = WhiteSpaceProcessor.trim(lexical).toString();
final UnmarshallingContext context = UnmarshallingContext.getInstance();
final Callable callable = context.getObjectFromId(idref,acc.valueType);
if(callable==null) {
// the IDResolver decided to abort it now
context.errorUnresolvedIDREF(bean,idref,context.getLocator());
return;
}
TargetT t;
try {
t = (TargetT)callable.call();
} catch (SAXException e) {// from callable.call
throw e;
} catch (RuntimeException e) {// from callable.call
throw e;
} catch (Exception e) {// from callable.call
throw new SAXException2(e);
}
if(t!=null) {
assign(bean,t,context);
} else {
// try again later
final LocatorEx loc = new LocatorEx.Snapshot(context.getLocator());
context.addPatcher(new Patcher() {
public void run() throws SAXException {
try {
TargetT t = (TargetT)callable.call();
if(t==null) {
context.errorUnresolvedIDREF(bean,idref,loc);
} else {
assign(bean,t,context);
}
} catch (AccessorException e) {
context.handleError(e);
} catch (SAXException e) {// from callable.call
throw e;
} catch (RuntimeException e) {// from callable.call
throw e;
} catch (Exception e) {// from callable.call
throw new SAXException2(e);
}
}
});
}
}
public boolean hasValue(BeanT bean) throws AccessorException {
return acc.get(bean)!=null;
}
}
}