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com.google.code.joliratools.bind.generate.XMLAdapterClassGenerator Maven / Gradle / Ivy
package com.google.code.joliratools.bind.generate;
import java.io.PrintWriter;
import com.google.code.joliratools.bind.schema.ArrayEntity;
import com.google.code.joliratools.bind.schema.BuiltInEntity;
import com.google.code.joliratools.bind.schema.CollectionEntity;
import com.google.code.joliratools.bind.schema.ComplexEntity;
import com.google.code.joliratools.bind.schema.Entity;
import com.google.code.joliratools.bind.schema.EntityVisitor;
import com.google.code.joliratools.bind.schema.EnumEntity;
import com.google.code.joliratools.bind.schema.Property;
import com.google.code.joliratools.bind.schema.Schema;
/**
* This class is responsible for generating the Java Source of Adapter classes
* for a given Schema.
*
* @author Joachim F. Kainz
*/
public abstract class XMLAdapterClassGenerator {
/**
* This postfix will be added to a className to create the name of the
* Adapter.
*/
public final static String ADAPTER_POSTFIX = "JAXROAdapter";
private final static String JAVA_PREFIX = "java.";
private static Property findRoot(final Property[] roots, final Entity entity) {
for (final Property root : roots) {
final Entity _entity = root.getType();
if (entity == _entity) {
return root;
}
}
return null;
}
/**
* Create an adapter name.
*
* @param entity
* the entity
* @return the adapter name
*/
protected static String getAdapterName(final Entity entity) {
final String className = getNormalizedClassName(entity);
if (!className.startsWith(JAVA_PREFIX)) {
return className + ADAPTER_POSTFIX;
}
final int prefixLen = JAVA_PREFIX.length();
final String name = className.substring(prefixLen);
return "com.google.code.joliratools.bind." + name + ADAPTER_POSTFIX;
}
/**
* @param entity
* @return the normalized class name
*/
protected static String getNormalizedClassName(final Entity entity) {
return entity.visit(new EntityVisitor() {
@Override
public String visit(final ArrayEntity _entity) {
final Entity componentEntity = _entity.getComponentEntity();
return getNormalizedClassName(componentEntity)
+ ArrayEntity.POST_FIX;
}
@Override
public String visit(final BuiltInEntity _entity) {
return visit((Entity) _entity);
}
@Override
public String visit(final CollectionEntity _entity) {
final Entity typeArgument = _entity.getTypeArgument();
return getNormalizedClassName(typeArgument)
+ CollectionEntity.POST_FIX;
}
@Override
public String visit(final ComplexEntity _entity) {
return visit((Entity) _entity);
}
public String visit(final Entity _entity) {
return _entity.getClassName();
}
@Override
public String visit(final EnumEntity _entity) {
return visit((Entity) _entity);
}
});
}
private static String getPackageName(final String name) {
final int lastDot = name.lastIndexOf('.');
return name.substring(0, lastDot);
}
private static String getSimpleName(final String name) {
final int lastDot = name.lastIndexOf('.');
return name.substring(lastDot + 1);
}
private final Schema schema;
/**
* Create a new generator.
*
* @param schema
* the schema to use for the generator
*/
public XMLAdapterClassGenerator(final Schema schema) {
this.schema = schema;
}
/**
* Subclasses need to provide the ability to actually create the Java source
* files.
*
* @param classname
* the name of the class for which a source file should be
* generated
* @return a print writer to write into the newly created source file.
*/
protected abstract PrintWriter createSourceFile(String classname);
/**
* Create the Java Source for all the adapters required by the schema.
*/
public void generate() {
final Entity[] entities = schema.getEntities();
final Property[] roots = schema.getRootElements();
for (final Entity entity : entities) {
final Property root = findRoot(roots, entity);
generate(entity, root);
}
}
protected void generate(final ArrayEntity entity, final PrintWriter writer) {
final Property[] properties = entity.getProperties();
final Property property = properties[0];
generateForLoop(writer, property);
}
protected void generate(final BuiltInEntity entity, final PrintWriter writer) {
writer.println(" writer.print(adapted);");
}
protected void generate(final CollectionEntity entity,
final PrintWriter writer) {
final Property[] properties = entity.getProperties();
final Property property = properties[0];
generateForLoop(writer, property);
}
protected void generate(final ComplexEntity entity, final PrintWriter writer) {
final Property[] properties = entity.getProperties();
boolean isFirst = true;
for (final Property property : properties) {
if (!isFirst) {
writer.println();
} else {
isFirst = false;
}
generate(writer, property);
}
}
private void generate(final Entity _entity, final PrintWriter writer) {
_entity.visit(new EntityVisitor() {
@Override
public Void visit(final ArrayEntity entity) {
generate(entity, writer);
return null;
}
@Override
public Void visit(final BuiltInEntity entity) {
generate(entity, writer);
return null;
}
@Override
public Void visit(final CollectionEntity entity) {
generate(entity, writer);
return null;
}
@Override
public Void visit(final ComplexEntity entity) {
generate(entity, writer);
return null;
}
@Override
public Void visit(final EnumEntity entity) {
generate(entity, writer);
return null;
}
});
}
private void generate(final Entity entity, final Property root) {
final String clazzName = entity.getClassName();
final String adapterName = getAdapterName(entity);
final PrintWriter writer = createSourceFile(adapterName);
try {
final String pkgName = getPackageName(adapterName);
final String simpleName = getSimpleName(adapterName);
// header
writer.print("// AUTOMATICALLY GENERATED");
// writer.println(new Date());
writer.println("// DO NOT MODIFY!");
writer.println();
writer.print("package ");
writer.print(pkgName);
writer.println(';');
writer.println();
// class
writer.print("public class ");
writer.print(simpleName);
writer.println(" {");
// private member
writer.print(" private final ");
writer.print(clazzName);
writer.println(" adapted;");
writer.println();
// constructor
writer.print(" public ");
writer.print(simpleName);
writer.print('(');
writer.print(clazzName);
writer.print(" adapted");
writer.println(") {");
writer.println(" this.adapted = adapted;");
writer.println(" }");
writer.println();
// toXML(PrintWriter, Collection)
writer.println(" /**");
writer.println(" * DO NOT USE THIS METHOD! ");
writer.println(" * This method will be called be the");
writer.println(" * toXml(PrintWriter) method that is only");
writer.println(" * generated for classes marked with ");
writer.println(" * @RoRootElement.");
writer.println(" */");
writer.println(" public void toXML(java.io.PrintWriter writer, "
+ "java.util.Collection _processed) {");
writer.println(" if (!_processed.add(adapted)) {");
writer.println(" return;");
writer.println(" }");
writer.println();
writer
.println(" java.util.Collection processed = new java.util.HashSet(_processed);");
writer.println();
generate(entity, writer);
writer.println(" }");
if (root != null) {
// toXML(PrintWriter)
writer.println();
writer.println(" public void toXML(java.io.PrintWriter "
+ "writer) {");
writer.println(" java.util.Collection processed = "
+ "new java.util.HashSet();");
writer.println();
writer.println(" writer.print(\"\");");
final String rootName = root.getName();
printOpenTag(writer, rootName, 2);
writer.println(" toXML(writer, processed);");
printCloseTag(writer, rootName, 2);
writer.println(" }");
}
writer.println("}");
} finally {
writer.close();
}
}
/**
* @param entity
* the entity to be generated
* @param writer
* the writer
*/
protected void generate(final EnumEntity entity, final PrintWriter writer) {
writer.println(" writer.print(adapted);");
}
private void generate(final PrintWriter writer, final Property property) {
final String name = property.getName();
final Entity type = property.getType();
final String clazzName = type.getClassName();
final String accessorName = property.getAccessorName();
writer.print(" // ");
writer.println("_" + name);
writer.print(" ");
writer.print(clazzName);
writer.print(' ');
writer.print("_" + name);
writer.print(" = adapted.");
writer.print(accessorName);
writer.println(';');
writer.println();
generate(writer, name, type, 2);
}
private void generate(final PrintWriter writer, final String name,
final Entity type, final int baseLevel) {
type.visit(new EntityVisitor() {
@Override
public Void visit(final ArrayEntity _entity) {
visit((Entity) _entity);
return null;
}
@Override
public Void visit(final BuiltInEntity _entity) {
final boolean isObject = _entity.isObject();
if (isObject) {
printIntent(writer, baseLevel);
writer.print("if (null != ");
writer.print("_" + name);
writer.println(") {");
}
final int level = baseLevel + (isObject ? 1 : 0);
printOpenTag(writer, name, level);
printIntent(writer, level);
writer.print("writer.print(");
final String className = _entity.getClassName();
if ("java.lang.String".equals(className)) {
writer
.print("org.apache.commons.lang.StringEscapeUtils.escapeXml(");
writer.print("_" + name);
writer.print(')');
} else if ("java.util.Date".equals(className)) {
writer
.print("new java.text.SimpleDateFormat(\"yyyy-MM-dd'T'HH:mm:ss\").");
writer.print("format(");
writer.print("_" + name);
writer.print(')');
} else {
writer.print("_" + name);
}
writer.println(");");
printCloseTag(writer, name, level);
if (isObject) {
printIntent(writer, baseLevel);
writer.println("}");
}
return null;
}
@Override
public Void visit(final CollectionEntity _entity) {
visit((Entity) _entity);
return null;
}
@Override
public Void visit(final ComplexEntity _entity) {
visit((Entity) _entity);
return null;
}
private void visit(final Entity _entity) {
printIntent(writer, baseLevel);
writer.print("if (null != ");
writer.print("_" + name);
writer.println(") {");
printOpenTag(writer, name, baseLevel + 1);
writer.println();
final String _name = getAdapterName(_entity);
printIntent(writer, baseLevel + 1);
writer.print(_name);
writer.println(" adapter = new ");
writer.print(_name);
writer.print("(");
writer.print("_" + name);
writer.println(");");
writer.println();
printIntent(writer, baseLevel + 1);
writer.println("adapter.toXML(writer, processed);");
printCloseTag(writer, name, baseLevel + 1);
printIntent(writer, baseLevel);
writer.println("}");
}
@Override
public Void visit(final EnumEntity _entity) {
visit((Entity) _entity);
return null;
}
});
}
private void generateForLoop(final PrintWriter writer,
final Property property) {
final Entity type = property.getType();
final String name = property.getName();
final String clazzName = type.getClassName();
writer.print(" for (");
writer.print(clazzName);
writer.print(' ');
writer.print("_" + name);
writer.println(" : adapted) {");
generate(writer, name, type, 3);
writer.println(" }");
}
protected void printCloseTag(final PrintWriter writer, final String name,
final int level) {
printIntent(writer, level);
writer.print("writer.print(\"\");");
}
protected void printIntent(final PrintWriter writer, final int level) {
for (int idx = 0; idx < level; idx++) {
writer.print(" ");
}
}
protected void printOpenTag(final PrintWriter writer, final String name,
final int level) {
printIntent(writer, level);
writer.print("writer.print(\"<");
writer.print(name);
writer.println(">\");");
}
}
