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/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v2.codegen.bean;
import java.util.*;
import java.io.Serializable;
import java.io.IOException;
import com.mchange.v2.codegen.IndentedWriter;
import com.mchange.v2.ser.IndirectPolicy;
public class IndirectingSerializableExtension extends SerializableExtension
{
protected String findIndirectorExpr;
protected String indirectorClassName;
/**
* We expect this indirector to be a public class with a public no_arg ctor;
* If you need the indirector initialized somehow, you'll have to extend
* the class.
*
* @see #writeInitializeIndirector
* @see #writeExtraDeclarations
*/
public IndirectingSerializableExtension( String indirectorClassName )
{
this.indirectorClassName = indirectorClassName;
this.findIndirectorExpr = "new " + indirectorClassName + "()";
}
protected IndirectingSerializableExtension()
{}
public Collection extraSpecificImports()
{
Collection col = super.extraSpecificImports();
col.add( indirectorClassName );
col.add( "com.mchange.v2.ser.IndirectlySerialized" );
col.add( "com.mchange.v2.ser.Indirector" );
col.add( "com.mchange.v2.ser.SerializableUtils" );
col.add( "java.io.NotSerializableException" );
return col;
}
protected IndirectPolicy indirectingPolicy( Property prop, Class propType )
{
if (Serializable.class.isAssignableFrom( propType ))
return IndirectPolicy.DEFINITELY_DIRECT;
else
return IndirectPolicy.INDIRECT_ON_EXCEPTION;
}
/**
* hook method... does nothing by default... override at will.
* The indirector will be called, uh, "indirector".
* You are in the middle of a method when you define this.
*/
protected void writeInitializeIndirector( Property prop, Class propType, IndentedWriter iw ) throws IOException
{}
protected void writeExtraDeclarations(ClassInfo info, Class superclassType, Property[] props, Class[] propTypes, IndentedWriter iw)
throws IOException
{}
public void generate(ClassInfo info, Class superclassType, Property[] props, Class[] propTypes, IndentedWriter iw)
throws IOException
{
super.generate( info, superclassType, props, propTypes, iw);
writeExtraDeclarations( info, superclassType, props, propTypes, iw);
}
protected void writeStoreObject( Property prop, Class propType, IndentedWriter iw ) throws IOException
{
IndirectPolicy policy = indirectingPolicy( prop, propType );
if (policy == IndirectPolicy.DEFINITELY_INDIRECT)
writeIndirectStoreObject( prop, propType, iw );
else if (policy == IndirectPolicy.INDIRECT_ON_EXCEPTION)
{
iw.println("try");
iw.println("{");
iw.upIndent();
iw.println("//test serialize");
iw.println("SerializableUtils.toByteArray(" + prop.getName() + ");");
super.writeStoreObject( prop, propType, iw );
iw.downIndent();
iw.println("}");
iw.println("catch (NotSerializableException nse)");
iw.println("{");
iw.upIndent();
writeIndirectStoreObject( prop, propType, iw );
iw.downIndent();
iw.println("}");
}
else if (policy == IndirectPolicy.DEFINITELY_DIRECT)
super.writeStoreObject( prop, propType, iw );
else
throw new InternalError("indirectingPolicy() overridden to return unknown policy: " + policy);
}
protected void writeIndirectStoreObject( Property prop, Class propType, IndentedWriter iw ) throws IOException
{
iw.println("try");
iw.println("{");
iw.upIndent();
iw.println("Indirector indirector = " + findIndirectorExpr + ';');
writeInitializeIndirector( prop, propType, iw );
iw.println("oos.writeObject( indirector.indirectForm( " + prop.getName() + " ) );");
iw.downIndent();
iw.println("}");
iw.println("catch (IOException indirectionIOException)");
iw.println("{ throw indirectionIOException; }");
iw.println("catch (Exception indirectionOtherException)");
iw.println("{ throw new IOException(\"Problem indirectly serializing " + prop.getName() + ": \" + indirectionOtherException.toString() ); }");
}
protected void writeUnstoreObject( Property prop, Class propType, IndentedWriter iw ) throws IOException
{
IndirectPolicy policy = indirectingPolicy( prop, propType );
if (policy == IndirectPolicy.DEFINITELY_INDIRECT || policy == IndirectPolicy.INDIRECT_ON_EXCEPTION)
{
iw.println("// we create an artificial scope so that we can use the name o for all indirectly serialized objects.");
iw.println("{");
iw.upIndent();
iw.println("Object o = ois.readObject();");
iw.println("if (o instanceof IndirectlySerialized) o = ((IndirectlySerialized) o).getObject();");
iw.println("this." + prop.getName() + " = (" + prop.getSimpleTypeName() + ") o;");
iw.downIndent();
iw.println("}");
}
else if (policy == IndirectPolicy.DEFINITELY_DIRECT)
super.writeUnstoreObject( prop, propType, iw );
else
throw new InternalError("indirectingPolicy() overridden to return unknown policy: " + policy);
}
}
