/**
* 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.actions.iterators;
import org.whole.lang.actions.resources.ActionsRegistry;
import org.whole.lang.bindings.BindingManagerFactory;
import org.whole.lang.bindings.IBindingScope;
import org.whole.lang.bindings.NullScope;
import org.whole.lang.iterators.AbstractCloneableIterator;
import org.whole.lang.iterators.IEntityIterator;
import org.whole.lang.model.IEntity;
import org.whole.lang.operations.ICloneContext;
/**
* @author Riccardo Solmi
*/
public class ActionCallIterator extends AbstractCloneableIterator<IEntity>{
protected String functionUri;
private IEntityIterator<IEntity> functionIterator;
private IEntityIterator<?>[] argsIterators;
private boolean useSelectedEntities;
private IEntity nextEntity = null;
private IEntity resetEntity = null;
public /*protected*/ ActionCallIterator(String functionUri) {
this(functionUri, null);
useSelectedEntities = true;
}
public /*protected*/ ActionCallIterator(String functionUri, IEntityIterator<?>[] optArgsIterators) {
this.functionUri = functionUri;
this.argsIterators = optArgsIterators;
useSelectedEntities = false;
}
@Override
public IEntityIterator<IEntity> clone(ICloneContext cc) {
ActionCallIterator iterator = (ActionCallIterator) super.clone(cc);
iterator.functionIterator = cc.clone(functionIterator);
if (argsIterators != null) {
iterator.argsIterators = argsIterators.clone();
for (int i=0; i<argsIterators.length; i++)
iterator.argsIterators[i] = cc.clone(argsIterators[i]);
}
return iterator;
}
protected IEntityIterator<IEntity> functionIterator() {
if (functionIterator == null) {
String contextUri = getBindings().wIsSet("contextURI") ? getBindings().wStringValue("contextURI") : null;
functionIterator = ActionsRegistry.instance().getFunctionCode(functionUri, true, contextUri);
functionIterator.setBindings(getBindings());
}
if (resetEntity != null) {
functionIterator.reset(resetEntity);
initArguments();
resetEntity = null;
}
return functionIterator;
}
protected void initArguments() {
if (!useSelectedEntities) {
IEntity selectedEntities = BindingManagerFactory.instance.createTuple();
if (argsIterators != null && argsIterators.length > 0)
for (IEntityIterator<?> argIterator : argsIterators) {
argIterator.setBindings(getBindings());
argIterator.reset(resetEntity);
for (IEntity arg : argIterator)
selectedEntities.wAdd(arg);
}
else
selectedEntities.wAdd(resetEntity);
getBindings().wDef("selectedEntities", selectedEntities);
if (selectedEntities.wSize() > 0)
getBindings().wDef("primarySelectedEntity", selectedEntities.wGet(0));
}
getBindings().wDef("self", resetEntity);
}
public boolean hasNext() {
return lookahead() != null;
}
public IEntity next() {
getBindings().wEnterScope();
IEntity result = functionIterator().next();
getBindings().wExitScope();
getBindings().wAddAll(lookaheadScope());
nextEntity = null;
return result;
}
public IEntity lookahead() {
if (nextEntity != null)
return nextEntity;
if (functionIterator == null && resetEntity == null)
return null;
IBindingScope laScope = lookaheadScope();
for (String name : laScope.wLocalNames())
getBindings().wUnset(name);
getBindings().wEnterScope();
nextEntity = functionIterator().lookahead();
getBindings().wExitScope();
return nextEntity;
}
public void set(IEntity entity) {
functionIterator().set(entity);
}
public void add(IEntity entity) {
functionIterator().add(entity);
}
public void remove() {
functionIterator().remove();
}
public void reset(IEntity entity) {
resetEntity = entity;
functionIterator = null;
// lookaheadScope = null;
nextEntity = null;
}
// private IDelegatingScope lookaheadScope;
public IBindingScope lookaheadScope() {
// if (lookaheadScope != null)
// return lookaheadScope.wWithTargetScope(functionIterator().lookaheadScope());
// else
return functionIterator != null ? functionIterator().lookaheadScope() : NullScope.instance;
}
public void prune() {
functionIterator().prune();
}
@Override
public void toString(StringBuilder sb) {
sb.append(functionUri);
sb.append("(...)");
}
}