/**
* Copyright (c) 2013, Institute of Information Systems (Sven Groppe and contributors of LUPOSDATE), University of Luebeck
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* - Neither the name of the University of Luebeck nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package lupos.gui.operatorgraph.visualeditor.queryeditor.operators;
import java.util.HashSet;
import lupos.datastructures.items.Variable;
import lupos.gui.operatorgraph.graphwrapper.GraphWrapper;
import lupos.gui.operatorgraph.prefix.Prefix;
import lupos.gui.operatorgraph.visualeditor.guielements.AbstractGuiComponent;
import lupos.gui.operatorgraph.visualeditor.guielements.OperatorPanel;
import lupos.gui.operatorgraph.visualeditor.guielements.VisualGraph;
import lupos.gui.operatorgraph.visualeditor.operators.JTFOperator;
import lupos.gui.operatorgraph.visualeditor.operators.Operator;
import lupos.gui.operatorgraph.visualeditor.util.ModificationException;
import lupos.misc.util.OperatorIDTuple;
import lupos.sparql1_1.ParseException;
import lupos.sparql1_1.SPARQL1_1Parser;
import lupos.sparql1_1.SimpleNode;
public class Filter extends JTFOperator {
private String filterExpression = "";
public Filter(Prefix prefix) {
super(prefix);
}
public Filter(Prefix prefix, String filterExpression) {
super(prefix);
this.filterExpression = filterExpression;
}
public String toString() {
return this.filterExpression;
}
public void applyChange(String value) throws ModificationException {
try {
SPARQL1_1Parser.parseFilter( value, prefix.getPrefixNames());
this.filterExpression = value;
}
catch(Throwable t) {
this.handleParseError(t);
}
}
public AbstractGuiComponent<Operator> draw(GraphWrapper gw, VisualGraph<Operator> parent) {
this.panel = new OperatorPanel(this, gw, parent, this.prefix.add(this.toString()), "Filter");
return this.panel;
}
public StringBuffer serializeOperator() {
StringBuffer ret = new StringBuffer();
ret.append("FILTER(" + this.filterExpression + ") .\n");
return ret;
}
public StringBuffer serializeOperatorAndTree(HashSet<Operator> visited) {
StringBuffer ret = this.serializeOperator();
for(OperatorIDTuple<Operator> opIDt : this.succeedingOperators)
ret.append(opIDt.getOperator().serializeOperatorAndTree(visited));
return ret;
}
public boolean variableInUse(String variable, HashSet<Operator> visited) {
if(visited.contains(this))
return false;
visited.add(this);
try {
HashSet<Variable> variables = new HashSet<Variable>();
SimpleNode node = SPARQL1_1Parser.parseFilter("FILTER(" + this.filterExpression + ")", this.prefix.getPrefixNames());
Operator.computeUsedVariables(node, variables);
if(variables.contains(new Variable(variable)))
return true;
} catch (ParseException e) {
e.printStackTrace();
return false;
}
for(OperatorIDTuple<Operator> opIDT : this.succeedingOperators)
if(opIDT.getOperator().variableInUse(variable, visited))
return true;
return false;
}
@Override
public String getXPrefID(){
return "queryEditor_style_filter";
}
}