/**
* Copyright 2004-2016 Riccardo Solmi. All rights reserved.
* This file is part of the Whole Platform.
*
* The Whole Platform is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The Whole Platform 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
*/
package org.whole.lang.iterators;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.whole.lang.bindings.IBindingScope;
import org.whole.lang.bindings.NullScope;
import org.whole.lang.model.IEntity;
import org.whole.lang.operations.ICloneContext;
import org.whole.lang.reflect.FeatureDescriptor;
/**
* @author Riccardo Solmi
*/
public class AspectIterator extends AbstractCloneableIterator<IEntity> {
protected IEntity entity;
protected Iterator<FeatureDescriptor> aspectualFeatureDescriptorIterator;
protected FeatureDescriptor nextFeatureDescriptor;
protected FeatureDescriptor lastFeatureDescriptor;
@Override
public IEntityIterator<IEntity> clone(ICloneContext cc) {
AspectIterator iterator = (AspectIterator) super.clone(cc);
iterator.aspectualFeatureDescriptorIterator = null;
return this;
}
public IBindingScope lookaheadScope() {
return NullScope.instance;
}
public boolean hasNext() {
return nextFeatureDescriptor != null || aspectualFeatureDescriptorIterator.hasNext();
}
public IEntity lookahead() {
return lookaheadFeatureDescriptor() == null ? null : entity.wGet(nextFeatureDescriptor);
}
protected FeatureDescriptor lookaheadFeatureDescriptor() {
return nextFeatureDescriptor != null ? nextFeatureDescriptor : nextFeatureDescriptor();
}
protected FeatureDescriptor nextFeatureDescriptor() {
return nextFeatureDescriptor = aspectualFeatureDescriptorIterator.hasNext() ?
aspectualFeatureDescriptorIterator.next() : null;
}
public IEntity next() {
IEntity result = lookahead();
if (result == null)
throw new NoSuchElementException();
lastFeatureDescriptor = nextFeatureDescriptor;
nextFeatureDescriptor = null;
return result;
}
public void reset(IEntity entity) {
this.entity = entity;
aspectualFeatureDescriptorIterator = entity.wGetAspectualFeatureDescriptors().iterator();
nextFeatureDescriptor = null;
lastFeatureDescriptor = null;
}
public void prune() {
}
public void set(IEntity entity) {
if (lastFeatureDescriptor == null)
throw new IllegalStateException();
this.entity.wSet(lastFeatureDescriptor, entity);
}
public void add(IEntity entity) {
throw new UnsupportedOperationException();
}
public void remove() {
if (lastFeatureDescriptor == null)
throw new IllegalStateException();
entity.wRemove(lastFeatureDescriptor);
lastFeatureDescriptor = null;
}
@Override
public void toString(StringBuilder sb) {
sb.append("aspect()");
}
}