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CodeBlock.java
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CodeBlock.java
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.codegen;
import static org.neo4j.codegen.Resource.withResource;
import static org.neo4j.codegen.TypeReference.typeReference;
public class CodeBlock implements AutoCloseable
{
final ClassGenerator clazz;
private MethodEmitter emitter;
private final CodeBlock parent;
private boolean done;
CodeBlock( CodeBlock parent )
{
this.clazz = parent.clazz;
this.emitter = parent.emitter;
parent.emitter = InvalidState.IN_SUB_BLOCK;
this.parent = parent;
}
CodeBlock( ClassGenerator clazz, MethodEmitter emitter )
{
this.clazz = clazz;
this.emitter = emitter;
this.parent = null;
}
public ClassGenerator classGenerator()
{
return clazz;
}
@Override
public void close()
{
endBlock();
if ( parent != null )
{
parent.emitter = emitter;
}
else
{
emitter.done();
}
this.emitter = InvalidState.BLOCK_CLOSED;
}
private void endBlock()
{
if ( !done )
{
emitter.endBlock();
done = true;
}
}
public void expression( Expression expression )
{
emitter.expression( expression );
}
TypeReference local( String name )
{
return null;
}
public LocalVariable declare( TypeReference type, String name )
{
LocalVariable local = new LocalVariable( type, name );
emitter.declare( local );
return local;
}
public void assign( LocalVariable local, Expression value )
{
emitter.assign( local, value );
}
public void assign( Class<?> type, String name, Expression value )
{
assign( typeReference( type ), name, value );
}
public void assign( TypeReference type, String name, Expression value )
{
emitter.assign( type, name, value );
}
public void put( Expression target, FieldReference field, Expression value )
{
emitter.put( target, field, value );
}
public Expression self()
{
return load( "this" );
}
public Expression load( String name )
{
return Expression.load( local( name ), name );
}
public CodeBlock forEach( Parameter local, Expression iterable )
{
emitter.beginForEach( local, iterable );
return new CodeBlock( this );
}
public CodeBlock whileLoop( Expression test )
{
emitter.beginWhile( test );
return new CodeBlock( this );
}
public CodeBlock ifStatement( Expression test )
{
emitter.beginIf( test );
return new CodeBlock( this );
}
CodeBlock emitCatch( Parameter exception )
{
endBlock();
emitter.beginCatch( exception );
return new CodeBlock( this );
}
CodeBlock emitFinally()
{
endBlock();
emitter.beginFinally();
return new CodeBlock( this );
}
public CodeBlock tryBlock( Class<?> resourceType, String resourceName, Expression resource )
{
return tryBlock( withResource( resourceType, resourceName, resource ) );
}
public CodeBlock tryBlock( TypeReference resourceType, String resourceName, Expression resource )
{
return tryBlock( withResource( resourceType, resourceName, resource ) );
}
public TryBlock tryBlock( Resource... resources )
{
emitter.beginTry( resources );
return new TryBlock( this );
}
public void returns()
{
emitter.returns();
}
public void returns( Expression value )
{
emitter.returns( value );
}
public void throwException( Expression exception )
{
emitter.throwException( exception );
}
public TypeReference owner()
{
return clazz.handle();
}
}