r/org.eclipse.statet.r.console.core/src/org/eclipse/statet/internal/r/rdata/RReferenceVar.java

/*=============================================================================#
 # Copyright (c) 2009, 2020 Stephan Wahlbrink and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 # which is available at https://www.apache.org/licenses/LICENSE-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 # 
 # Contributors:
 #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.internal.r.rdata;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

import org.eclipse.statet.jcommons.lang.NonNullByDefault;
import org.eclipse.statet.jcommons.lang.Nullable;

import org.eclipse.statet.ltk.model.core.element.LtkModelElementFilter;
import org.eclipse.statet.r.console.core.RWorkspace;
import org.eclipse.statet.r.core.data.CombinedRElement;
import org.eclipse.statet.r.core.data.CombinedRReference;
import org.eclipse.statet.r.core.model.RElementName;
import org.eclipse.statet.rj.data.RJIO;
import org.eclipse.statet.rj.data.RObject;
import org.eclipse.statet.rj.data.RObjectFactory;
import org.eclipse.statet.rj.data.RReference;
import org.eclipse.statet.rj.data.RStore;
import org.eclipse.statet.rj.data.impl.ExternalizableRObject;


@NonNullByDefault
public final class RReferenceVar extends BasicCombinedRElement
		implements CombinedRReference, ExternalizableRObject {
	
	
	private final long handle;
	private final byte type;
	private final String baseClassName;
	
	private @Nullable RWorkspace resolver;
	
	
	public RReferenceVar(final long handle, final byte type, final String className,
			final @Nullable BasicCombinedRElement parent, final @Nullable RElementName name) {
		super(parent, name);
		
		this.handle= handle;
		this.type= type;
		this.baseClassName= className;
	}
	
	public RReferenceVar(final RReference org,
			final @Nullable BasicCombinedRElement parent, final @Nullable RElementName name) {
		super(parent, name);
		
		this.handle= org.getHandle();
		this.type= org.getReferencedRObjectType();
		this.baseClassName= org.getRClassName();
	}
	
	public RReferenceVar(final RJIO io, final RObjectFactory factory,
			final @Nullable BasicCombinedRElement parent, final @Nullable RElementName name)
			throws IOException {
		super(parent, name);
		
		this.handle= io.readLong();
		this.type= io.readByte();
		this.baseClassName= io.readString();
	}
	
	@Override
	public void writeExternal(final RJIO io, final RObjectFactory factory) throws IOException {
		io.writeLong(this.handle);
		io.writeByte(this.type);
		io.writeString(this.baseClassName);
	}
	
	
	@Override
	public byte getRObjectType() {
		return TYPE_REFERENCE;
	}
	
	@Override
	public byte getReferencedRObjectType() {
		return this.type;
	}
	
	@Override
	public String getRClassName() {
		return this.baseClassName;
	}
	
	@Override
	public long getLength() {
		return 0;
	}
	
	@Override
	public long getHandle() {
		return this.handle;
	}
	
	public void setResolver(final @Nullable RWorkspace resolver) {
		this.resolver= resolver;
	}
	
	@Override
	public @Nullable RObject getResolvedRObject() {
		if (this.resolver != null) {
			return this.resolver.resolve(this, 0);
		}
		return null;
	}
	
	@Override
	public @Nullable RStore<?> getData() {
		return null;
	}
	
	
	@Override
	public int getElementType() {
		return R_GENERAL_VARIABLE;
	}
	
	@Override
	public boolean hasModelChildren(final @Nullable LtkModelElementFilter filter) {
		return false;
	}
	
	@Override
	public List<? extends CombinedRElement> getModelChildren(final @Nullable LtkModelElementFilter filter) {
		return Collections.emptyList();
	}
	
}