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CodeBlock.java
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CodeBlock.java
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/*
* Copyright (c) 2002-2016 "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 java.util.Iterator;
import java.util.function.Consumer;
import static org.neo4j.codegen.LocalVariables.copy;
import static org.neo4j.codegen.MethodReference.methodReference;
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;
protected LocalVariables localVariables = new LocalVariables();
CodeBlock( CodeBlock parent )
{
this.clazz = parent.clazz;
this.emitter = parent.emitter;
parent.emitter = InvalidState.IN_SUB_BLOCK;
this.parent = parent;
//copy over local variables from parent
this.localVariables = copy( parent.localVariables );
}
CodeBlock( ClassGenerator clazz, MethodEmitter emitter, Parameter... parameters )
{
this.clazz = clazz;
this.emitter = emitter;
this.parent = null;
localVariables.createNew( clazz.handle(), "this" );
for ( Parameter parameter : parameters )
{
localVariables.createNew( parameter.type(), parameter.name() );
}
}
public ClassGenerator classGenerator()
{
return clazz;
}
@Override
public void close()
{
endBlock();
if ( parent != null )
{
parent.emitter = emitter;
}
else
{
emitter.done();
}
this.emitter = InvalidState.BLOCK_CLOSED;
}
protected void endBlock()
{
if ( !done )
{
emitter.endBlock();
done = true;
}
}
protected void emit( Consumer<MethodEmitter> emitFunction )
{
emitFunction.accept( emitter );
}
public void expression( Expression expression )
{
emit( ( e ) -> e.expression( expression ) );
}
LocalVariable local( String name )
{
return localVariables.get( name );
}
public LocalVariable declare( TypeReference type, String name )
{
LocalVariable local = localVariables.createNew( type, name );
emit( e -> e.declare( local ) );
return local;
}
public void assign( LocalVariable local, Expression value )
{
emit( e -> e.assignVariableInScope( 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 )
{
LocalVariable variable = localVariables.createNew( type, name );
emit( e -> e.assign( variable, value ) );
}
public void put( Expression target, FieldReference field, Expression value )
{
emit( e -> e.put( target, field, value ) );
}
public Expression self()
{
return load( "this" );
}
public Expression load( String name )
{
return Expression.load( local( name ) );
}
/*
* Foreach is just syntactic sugar for a while loop.
*
*/
public CodeBlock forEach( Parameter local, Expression iterable )
{
String iteratorName = local.name() + "Iter";
assign( Iterator.class, iteratorName, Expression.invoke( iterable,
MethodReference.methodReference( Iterable.class, Iterator.class, "iterator" ) ) );
CodeBlock block = whileLoop( Expression
.invoke( load( iteratorName ), methodReference( Iterator.class, boolean.class, "hasNext" ) ) );
block.assign( local.type(), local.name(),
Expression.cast( local.type(), Expression.invoke( block.load( iteratorName ),
methodReference( Iterator.class, Object.class, "next" ) ) ) );
return block;
}
public CodeBlock whileLoop( Expression test )
{
emit( e -> e.beginWhile( test ) );
return new CodeBlock( this );
}
public CodeBlock ifStatement( Expression test )
{
emit( e -> e.beginIf( test ) );
return new CodeBlock( this );
}
public CodeBlock ifNotStatement( Expression test )
{
emit( e -> e.beginIfNot( test ) );
return new CodeBlock( this );
}
public void tryCatch( Consumer<CodeBlock> body, Consumer<CodeBlock> onError, Parameter exception )
{
emit( e -> e.tryCatchBlock( body, onError, localVariables.createNew( exception.type(), exception.name() ),
this ) );
}
public void returns()
{
emit( MethodEmitter::returns );
}
public void returns( Expression value )
{
emit( e -> e.returns( value ) );
}
public void throwException( Expression exception )
{
emit( e -> e.throwException( exception ) );
}
public TypeReference owner()
{
return clazz.handle();
}
}