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package examples.serialize;
import openjava.mop.*;
import openjava.ptree.*;
import openjava.syntax.*;
/**
* The class <code>CapsuleClass</code> is a metaclass which
* adds methods for serialization of the instances of the class.
*/
public class SerializableClass instantiates Metaclass extends OJClass
{
/** Overrides to translate definition of the class */
public void translateDefinition() throws MOPException {
OJClass baseClass = getSuperclass();
OJField[] fields = getDeclaredFields();
addReaderMethod(fields);
addWriterMethod(fields);
}
convenient void addReaderMethod(OJField[] fieldsToWrite)
throws MOPException
{
OJClass declaringClass = this;
OJModifier modifier = OJModifier.constantEmpty().setPublic();
OJClass returnType = OJSystem.VOID;
String methodName = "readObject";
OJClass[] paramTypes = new OJClass[]{ObjectIn.class};
String[] paramNames = new String[]{"in"};
OJClass[] exepTypes = new OJClass[]{java.io.IOException.class};
OJMethod reader
= new OJMethod(this, modifier, returnType, methodName,
paramTypes, paramNames, exepTypes, null);
addMethod(reader);
Environment env = reader.getEnvironment();
StatementList body = new StatementList();
for (int i = 0; i < fieldsToWrite.length; ++i) {
body.add(createReadExprFor(env, fieldsToWrite[i]));
}
reader.setBody(body);
}
Statement createReadExprFor(Environment env, OJField field)
throws MOPException
{
OJClass type = field.getType();
String name = field.getName();
if (type == OJSystem.STRING) {
return makeStatement(env, name + " = in.readUTF();");
} else if (type == OJSystem.BYTE) {
return makeStatement(env, name + " = in.readByte();");
} else if (type == OJSystem.BOOLEAN) {
return makeStatement(env, name + " = in.readBoolean();");
} else if (type == OJSystem.CHAR) {
return makeStatement(env, name + " = in.readChar();");
} else if (type == OJSystem.INT) {
return makeStatement(env, name + " = in.readInt();");
} else if (type == OJSystem.LONG) {
return makeStatement(env, name + " = in.readLong();");
} else if (type.isArray()) {
return null; /* not implemented yet. */
} else if (! type.isPrimitive()) {
return makeStatement(env, name + " = in.readObject();");
}
return null;
}
convenient void addWriterMethod(OJField[] fieldsToWrite)
throws MOPException
{
OJClass declaringClass = this;
OJModifier modifier = OJModifier.constantEmpty().setPublic();
OJClass returnType = OJSystem.VOID;
String methodName = "writeObject";
OJClass[] paramTypes = new OJClass[]{ObjectOut.class};
String[] paramNames = new String[]{"out"};
OJClass[] exepTypes = new OJClass[]{java.io.IOException.class};
OJMethod writer
= new OJMethod(this, modifier, returnType, methodName,
paramTypes, paramNames, exepTypes, null);
addMethod(writer);
Environment env = writer.getEnvironment();
StatementList body = new StatementList();
body.add(makeStatement(env, "out.writeUTF(\"" + getName() + "\");"));
for (int i = 0; i < fieldsToWrite.length; ++i) {
body.add(createWriteExprFor(env, fieldsToWrite[i]));
}
writer.setBody(body);
}
Statement createWriteExprFor(Environment env, OJField field)
throws MOPException
{
OJClass type = field.getType();
String name = field.getName();
if (type == OJSystem.STRING) {
return makeStatement(env, "out.writeUTF(" + name + ");");
} else if (type == OJSystem.BYTE) {
return makeStatement(env, "out.writeByte(" + name + ");");
} else if (type == OJSystem.BOOLEAN) {
return makeStatement(env, "out.writeBoolean(" + name + ");");
} else if (type == OJSystem.CHAR) {
return makeStatement(env, "out.writeChar(" + name + ");");
} else if (type == OJSystem.INT) {
return makeStatement(env, "out.writeInt(" + name + ");");
} else if (type == OJSystem.LONG) {
return makeStatement(env, "out.writeLong(" + name + ");");
} else if (type.isArray()) {
return null; /* not implemented yet. */
} else if (! type.isPrimitive()) {
return makeStatement(env, "out.writeObject(" + name + ");");
}
return null;
}
}
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