/*
* Copyright 2014 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.dashbuilder.dataset.engine.filter;
import org.dashbuilder.dataset.DataColumn;
import org.dashbuilder.dataset.filter.ColumnFilter;
/**
* A data set function
*/
public abstract class DataSetFunction {
protected DataSetFilterContext context;
protected String columnId;
protected DataColumn dataColumn;
public DataSetFunction() {
}
public DataSetFunction(DataSetFilterContext ctx, ColumnFilter filter) {
this.context = ctx;
this.columnId = filter.getColumnId();
}
public DataSetFilterContext getContext() {
return context;
}
public void setContext(DataSetFilterContext context) {
this.context = context;
}
public String getColumnId() {
return columnId;
}
public void setColumnId(String columnId) {
this.columnId = columnId;
this.dataColumn = null;
if (columnId != null) {
this.dataColumn = context.getDataSet().getColumnById(columnId);
}
}
public DataColumn getDataColumn() {
if (dataColumn != null) return dataColumn;
if (columnId == null) return null;
return dataColumn = context.getDataSet().getColumnById(columnId);
}
/**
* Evaluate the filter function.
*/
public abstract boolean pass();
}