/*
* Geotoolkit - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
* (C) 2009, Geomatys
*
* 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.geotoolkit.filter.function;
import java.util.List;
import org.geotoolkit.filter.AbstractExpression;
import org.geotoolkit.gui.swing.tree.Trees;
import org.apache.sis.internal.util.UnmodifiableArrayList;
import org.opengis.filter.expression.Expression;
import org.opengis.filter.expression.ExpressionVisitor;
import org.opengis.filter.expression.Function;
import org.opengis.filter.expression.Literal;
import static org.apache.sis.util.ArgumentChecks.*;
/**
* Immutable abstract function.
*
* @author Johann Sorel (Geomatys)
* @module
*/
public abstract class AbstractFunction extends AbstractExpression implements Function {
protected final String name;
protected final List<Expression> parameters;
protected final Literal fallback;
public AbstractFunction(final String name, final Expression[] parameters, final Literal fallback) {
ensureNonNull("name", name);
this.name = name;
this.parameters = UnmodifiableArrayList.wrap(parameters);
this.fallback = fallback;
}
/**
* {@inheritDoc }
*/
@Override
public String getName() {
return name;
}
/**
* {@inheritDoc }
*/
@Override
public List<Expression> getParameters() {
return parameters;
}
/**
* {@inheritDoc }
*/
@Override
public Literal getFallbackValue() {
return fallback;
}
/**
* {@inheritDoc }
*/
@Override
public Object accept(final ExpressionVisitor visitor, final Object extraData) {
return visitor.visit(this, extraData);
}
@Override
public int hashCode() {
int hash = 3;
hash = 89 * hash + (this.name != null ? this.name.hashCode() : 0);
hash = 89 * hash + (this.parameters != null ? this.parameters.hashCode() : 0);
hash = 89 * hash + (this.fallback != null ? this.fallback.hashCode() : 0);
return hash;
}
@Override
public boolean equals(final Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final AbstractFunction other = (AbstractFunction) obj;
if ((this.name == null) ? (other.name != null) : !this.name.equals(other.name)) {
return false;
}
if (this.parameters != other.parameters && (this.parameters == null || !this.parameters.equals(other.parameters))) {
return false;
}
if (this.fallback != other.fallback && (this.fallback == null || !this.fallback.equals(other.fallback))) {
return false;
}
return true;
}
@Override
public String toString() {
return Trees.toString(getName(), parameters);
}
}