stream.expressions.version2.DoubleExpression Maven / Gradle / Ivy
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/*
* streams library
*
* Copyright (C) 2011-2014 by Christian Bockermann, Hendrik Blom
*
* streams is a library, API and runtime environment for processing high
* volume data streams. It is composed of three submodules "stream-api",
* "stream-core" and "stream-runtime".
*
* The streams library (and its submodules) is free software: you can
* redistribute it and/or modify it under the terms of the
* GNU Affero General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* The stream.ai library (and its submodules) 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package stream.expressions.version2;
import java.io.Serializable;
import stream.Context;
import stream.Data;
/**
* @author Hendrik Blom
*
*/
public class DoubleExpression extends AbstractExpression {
public final Double result;
public DoubleExpression(String e) {
super(e);
Double d = 0d;
if (this.isStatic()) {
Serializable s;
try {
s = r.get(null, null);
d = (s == null) ? null : (s instanceof Double) ? ((Double) s)
: new Double(s.toString());
} catch (Exception e1) {
e1.printStackTrace();
}
}
result = d;
}
@Override
public Double get(Context ctx, Data item) throws Exception {
if (statics)
return result;
Serializable s = r.get(ctx, item);
if (s == null)
return null;
if (s instanceof Double)
return ((Double) s);
if (s instanceof Boolean)
return ((Boolean) s) == true ? 1d : 0d;
return new Double(s.toString());
}
public Class type() {
return Double.class;
}
}