/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library 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;
* version 2.1 of the License.
*
* This library 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.
*/
package org.geotools.filter.text.commons;
import java.util.Date;
import java.util.EmptyStackException;
import java.util.Stack;
import org.geotools.filter.text.cql2.CQLException;
import org.geotools.temporal.object.DefaultInstant;
import org.geotools.temporal.object.DefaultPeriod;
import org.geotools.temporal.object.DefaultPosition;
import org.opengis.filter.Filter;
import org.opengis.filter.expression.Literal;
import org.opengis.filter.expression.PropertyName;
import org.opengis.temporal.Period;
import org.opengis.temporal.Position;
import com.vividsolutions.jts.geom.Geometry;
/**
* Holds the results of the building process in a stack
* <p>
* Warning: This component is not published. It is part of module implementation.
* Client module should not use this feature.
* </p>
* @author Mauricio Pazos - Axios Engineering
* @author Gabriel Roldan - Axios Engineering
*
*
* @source $URL$
* @version $Id$
* @since 2.4
*/
public final class BuildResultStack {
private final Stack<Result> stack = new Stack<Result>();
private final String cqlSource;
public BuildResultStack(final String cqlSource) {
assert cqlSource != null;
this.cqlSource = cqlSource;
}
public Result peek() {
return stack.peek();
}
public boolean empty() {
return stack.empty();
}
public Result popResult() throws CQLException {
return stack.pop();
}
public org.opengis.filter.expression.Expression popExpression()
throws CQLException {
Result item = null;
try {
item = stack.pop();
return (org.opengis.filter.expression.Expression) item.getBuilt();
} catch (ClassCastException cce) {
throw new CQLException("Expecting Expression",
item.getToken(), cce, this.cqlSource);
} catch (EmptyStackException ese) {
throw new CQLException("No items on stack");
}
}
public Literal popLiteral() throws CQLException {
Result item = null;
try {
item = stack.pop();
return (Literal) item.getBuilt();
} catch (ClassCastException cce) {
throw new CQLException("Expecting Literal",
item.getToken(), cce, this.cqlSource);
} catch (EmptyStackException ese) {
throw new CQLException("No items on stack");
}
}
public PropertyName popPropertyName() throws CQLException {
Result item = null;
try {
item = stack.pop();
return (PropertyName) item.getBuilt();
} catch (ClassCastException cce) {
throw new CQLException("Expecting Property",
item.getToken(), cce, this.cqlSource);
} catch (EmptyStackException ese) {
throw new CQLException("No items on stack");
}
}
public Filter popFilter() throws CQLException {
Result item = null;
try {
item = stack.pop();
return (Filter) item.getBuilt();
} catch (ClassCastException cce) {
throw new CQLException("Expecting Filter",
item.getToken(), cce, this.cqlSource);
} catch (EmptyStackException ese) {
throw new CQLException("No items on stack");
}
}
public PeriodNode popPeriodNode() throws CQLException {
Result item = null;
try {
item = stack.pop();
return (PeriodNode) item.getBuilt();
} catch (ClassCastException cce) {
throw new CQLException("Expecting Period",
item.getToken(), cce, this.cqlSource);
} catch (EmptyStackException ese) {
throw new CQLException("No items on stack");
}
}
public Period popPeriod() throws CQLException {
Result item = null;
try {
item = stack.pop();
PeriodNode periodNode = (PeriodNode) item.getBuilt();
Literal begin = periodNode.getBeginning();
Literal end = periodNode.getEnding();
Position ip1 = new DefaultPosition((Date) begin.getValue());
Position ip2 = new DefaultPosition((Date) end.getValue());
Period period = new DefaultPeriod(new DefaultInstant(ip1),new DefaultInstant(ip2 ));
return period;
} catch (ClassCastException cce) {
throw new CQLException("Expecting Period",
item.getToken(), cce, this.cqlSource);
} catch (EmptyStackException ese) {
throw new CQLException("No items on stack");
}
}
public double popDoubleValue() throws CQLException {
try {
Literal expr = this.popLiteral();
Double number = new Double(expr.getValue().toString());
return number.doubleValue();
} catch (ClassCastException cce) {
throw new CQLException("Expected double");
}
}
public int popIntegerValue() throws CQLException {
try {
Literal expr = this.popLiteral();
Integer number = (Integer) expr.getValue();
return number.intValue();
} catch (ClassCastException cce) {
throw new CQLException("Expected double");
}
}
public String popStringValue() throws CQLException {
Literal literal = this.popLiteral();
return literal.toString();
}
public String popIdentifierPart() throws CQLException {
try {
Result resultPart = stack.pop();
IToken token = resultPart.getToken();
return token.toString();
} catch (ClassCastException e) {
throw new CQLException("identifier part is expected");
}
}
public String popIdentifier() throws CQLException {
try {
Result result = (Result) stack.pop();
String identifier = (String) result.getBuilt();
return identifier;
} catch (ClassCastException e) {
throw new CQLException("fail in identifier parsing");
}
}
public Geometry popGeometry() throws CQLException {
try {
Result result = (Result) stack.pop();
Geometry g = (Geometry) result.getBuilt();
return g;
} catch (ClassCastException e) {
throw new CQLException("fail in geometry parsing");
}
}
public void push(Result item) {
stack.push(item);
}
public int size() {
return stack.size();
}
}