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package com.sun.tools.internal.xjc.reader.xmlschema.ct;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import com.sun.tools.internal.xjc.reader.xmlschema.WildcardNameClassBuilder;
import com.sun.xml.internal.xsom.XSAttributeUse;
import com.sun.xml.internal.xsom.XSComplexType;
import com.sun.xml.internal.xsom.XSContentType;
import com.sun.xml.internal.xsom.XSDeclaration;
import com.sun.xml.internal.xsom.XSElementDecl;
import com.sun.xml.internal.xsom.XSModelGroup;
import com.sun.xml.internal.xsom.XSModelGroupDecl;
import com.sun.xml.internal.xsom.XSParticle;
import com.sun.xml.internal.xsom.XSType;
import com.sun.xml.internal.xsom.XSWildcard;
import com.sun.xml.internal.xsom.visitor.XSTermFunction;
import com.sun.xml.internal.rngom.nc.ChoiceNameClass;
import com.sun.xml.internal.rngom.nc.NameClass;
import com.sun.xml.internal.rngom.nc.SimpleNameClass;
/**
* Binds a complex type derived from another complex type by extension.
*
* @author
* Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
*/
abstract class AbstractExtendedComplexTypeBuilder extends CTBuilder {
/**
* Map from {@link XSComplexType} to {@link NameClass}[2] that
* represents the names used in its child elements [0] and
* attributes [1].
*/
protected final Map<XSComplexType, NameClass[]> characteristicNameClasses = new HashMap<XSComplexType, NameClass[]>();
/**
* Computes a name class that represents everything in a given content model.
*/
protected final XSTermFunction<NameClass> contentModelNameClassBuilder = new XSTermFunction<NameClass>() {
public NameClass wildcard(XSWildcard wc) {
return WildcardNameClassBuilder.build(wc);
}
public NameClass modelGroupDecl(XSModelGroupDecl decl) {
return modelGroup(decl.getModelGroup());
}
public NameClass modelGroup(XSModelGroup group) {
NameClass nc = NameClass.NULL;
for( int i=0; i<group.getSize(); i++ )
nc = new ChoiceNameClass(nc, group.getChild(i).getTerm().apply(this));
return nc;
}
public NameClass elementDecl(XSElementDecl decl) {
return getNameClass(decl);
}
};
/**
* Checks if the particles/attributes defined in the type parameter
* collides with the name classes of anc/enc.
*
* @return true if there's a collision.
*/
protected boolean checkCollision(NameClass anc, NameClass enc, XSComplexType type) {
NameClass[] chnc = characteristicNameClasses.get(type);
if (chnc == null) {
chnc = new NameClass[2];
chnc[0] = getNameClass(type.getContentType());
// build attribute name classes
NameClass nc = NameClass.NULL;
Iterator itr = type.iterateAttributeUses();
while( itr.hasNext() )
anc = new ChoiceNameClass(anc, getNameClass(((XSAttributeUse) itr.next()).getDecl()));
XSWildcard wc = type.getAttributeWildcard();
if(wc!=null)
nc = new ChoiceNameClass(nc, WildcardNameClassBuilder.build(wc));
chnc[1] = nc;
characteristicNameClasses.put(type, chnc);
}
return chnc[0].hasOverlapWith(enc) || chnc[1].hasOverlapWith(anc);
}
/**
* Looks for the derivation chain t_1 > t_2 > ... > t
* and find t_i such that t_i derives by restriction but
* for every j>i, t_j derives by extension.
*
* @return null
* If there's no such t_i or if t_i is any type.
*/
protected XSComplexType getLastRestrictedType(XSComplexType t) {
if (t.getBaseType() == schemas.getAnyType()) {
return null; // we don't count the restriction from anyType
}
if (t.getDerivationMethod() == XSType.RESTRICTION) {
return t;
}
XSComplexType baseType = t.getBaseType().asComplexType();
if (baseType != null) {
return getLastRestrictedType(baseType);
} else {
return null;
}
}
/**
* Checks if this new extension is safe.
*
* UGLY.
* <p>
* If you have ctA extending ctB and ctB restricting ctC, our
* Java classes will look like CtAImpl extending CtBImpl
* extending CtCImpl.
*
* <p>
* Since a derived class unmarshaller uses the base class unmarshaller,
* this could potentially result in incorrect unmarshalling.
* We used to just reject such a case, but then we found that
* there are schemas that are using it.
*
* <p>
* One generalized observation that we reached is that if the extension
* is only adding new elements/attributes which has never been used
* in any of its base class (IOW, if none of the particle / attribute use /
* attribute wildcard can match the name of newly added elements/attributes)
* then it is safe to add them.
*
* <p>
* This function checks if the derivation chain to this type is
* not using restriction, and if it is, then checks if it is safe
* according to the above condition.
*
* @return false
* If this complex type needs to be rejected.
*/
protected boolean checkIfExtensionSafe(XSComplexType baseType, XSComplexType thisType) {
XSComplexType lastType = getLastRestrictedType(baseType);
if (lastType == null) {
return true; // no restriction in derivation chain
}
NameClass anc = NameClass.NULL;
// build name class for attributes in new complex type
Iterator itr = thisType.iterateDeclaredAttributeUses();
while (itr.hasNext()) {
anc = new ChoiceNameClass(anc, getNameClass(((XSAttributeUse) itr.next()).getDecl()));
}
// TODO: attribute wildcard
NameClass enc = getNameClass(thisType.getExplicitContent());
// check against every base type ... except the root anyType
while (lastType != lastType.getBaseType()) {
if (checkCollision(anc, enc, lastType)) {
return false;
}
if (lastType.getBaseType().isSimpleType()) // if the base type is a simple type, there won't be
// any further name collision.
{
return true;
}
lastType = lastType.getBaseType().asComplexType();
}
return true; // OK
}
/**
* Gets a {@link NameClass} that represents all the terms in the given content type.
* If t is not a particle, just return an empty name class.
*/
private NameClass getNameClass(XSContentType t) {
if(t==null) return NameClass.NULL;
XSParticle p = t.asParticle();
if(p==null) return NameClass.NULL;
else return p.getTerm().apply(contentModelNameClassBuilder);
}
/**
* Gets a {@link SimpleNameClass} from the name of a {@link XSDeclaration}.
*/
private NameClass getNameClass(XSDeclaration decl) {
return new SimpleNameClass(decl.getTargetNamespace(), decl.getName());
}
}