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package com.sun.tools.xjc;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.ValidatorHandler;
import com.sun.xml.bind.v2.util.XmlFactory;
import javax.xml.XMLConstants;
import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.SAXException;
import static com.sun.xml.bind.v2.util.XmlFactory.allowExternalAccess;
/**
* Wraps a JAXP {@link Schema} object and lazily instantiate it.
*
* This object is thread-safe. There should be only one instance of
* this for the whole VM.
*
* @author Kohsuke Kawaguchi
*/
public final class SchemaCache {
private final boolean createResolver;
private final String resourceName;
private final Class<?> clazz;
private Schema schema;
public SchemaCache(String resourceName, Class<?> classToResolveResources) {
this(resourceName, classToResolveResources, false);
}
public SchemaCache(String resourceName, Class<?> classToResolveResources, boolean createResolver) {
this.resourceName = resourceName;
this.createResolver = createResolver;
this.clazz = classToResolveResources;
}
public ValidatorHandler newValidator() {
if (schema==null) {
synchronized (this) {
if (schema == null) {
ResourceResolver resourceResolver = null;
try (InputStream is = clazz.getResourceAsStream(resourceName)) {
StreamSource source = new StreamSource(is);
source.setSystemId(resourceName);
// do not disable secure processing - these are well-known schemas
SchemaFactory sf = XmlFactory.createSchemaFactory(XMLConstants.W3C_XML_SCHEMA_NS_URI, false);
SchemaFactory schemaFactory = allowExternalAccess(sf, "file", false);
if (createResolver) {
resourceResolver = new ResourceResolver(clazz);
schemaFactory.setResourceResolver(resourceResolver);
}
schema = schemaFactory.newSchema(source);
} catch (IOException | SAXException e) {
InternalError ie = new InternalError(e.getMessage());
ie.initCause(e);
throw ie;
} finally {
if (resourceResolver != null) resourceResolver.closeStreams();
}
}
}
}
return schema.newValidatorHandler();
}
class ResourceResolver implements LSResourceResolver {
private List<InputStream> streamsToClose = Collections.synchronizedList(new ArrayList<InputStream>());
private Class<?> clazz;
ResourceResolver(Class<?> clazz) {
this.clazz = clazz;
}
@Override
public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {
// XSOM passes the namespace URI to the publicID parameter.
// we do the same here .
InputStream is = clazz.getResourceAsStream(systemId);
streamsToClose.add(is);
return new Input(is, publicId, systemId);
}
void closeStreams() {
for (InputStream is : streamsToClose) {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// nothing to do ...
}
}
}
}
}
}
class Input implements LSInput {
private InputStream is;
private String publicId;
private String systemId;
public Input(InputStream is, String publicId, String systemId) {
this.is = is;
this.publicId = publicId;
this.systemId = systemId;
}
@Override
public Reader getCharacterStream() {
return null;
}
@Override
public void setCharacterStream(Reader characterStream) {
}
@Override
public InputStream getByteStream() {
return is;
}
@Override
public void setByteStream(InputStream byteStream) {
}
@Override
public String getStringData() {
return null;
}
@Override
public void setStringData(String stringData) {
}
@Override
public String getSystemId() {
return systemId;
}
@Override
public void setSystemId(String systemId) {
}
@Override
public String getPublicId() {
return publicId;
}
@Override
public void setPublicId(String publicId) {
}
@Override
public String getBaseURI() {
return null;
}
@Override
public void setBaseURI(String baseURI) {
}
@Override
public String getEncoding() {
return null;
}
@Override
public void setEncoding(String encoding) {
}
@Override
public boolean getCertifiedText() {
return false;
}
@Override
public void setCertifiedText(boolean certifiedText) {
}
}