/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.designer.core.editor.expressions;
import java.util.ArrayList;
import java.util.Collections;
import org.pentaho.reporting.designer.core.settings.WorkspaceSettings;
import org.pentaho.reporting.engine.classic.core.function.Function;
import org.pentaho.reporting.engine.classic.core.metadata.ExpressionMetaData;
import org.pentaho.reporting.engine.classic.core.metadata.ExpressionRegistry;
import org.pentaho.reporting.engine.classic.core.metadata.GroupedMetaDataComparator;
/**
* A helper util that filter all known function and expressions and returns only the expressions, but not the
* functions.
*
* @author Thomas Morgner
*/
public class ExpressionUtil
{
private static ExpressionUtil instance;
public static synchronized ExpressionUtil getInstance()
{
if (instance == null)
{
instance = new ExpressionUtil();
}
return instance;
}
private ExpressionMetaData[] expressions;
private ExpressionMetaData[] functions;
public ExpressionMetaData[] getKnownFunctions()
{
return functions.clone();
}
public ExpressionMetaData[] getKnownExpressions()
{
return expressions.clone();
}
private ExpressionUtil()
{
final ArrayList<ExpressionMetaData> allRealExpressions = new ArrayList<ExpressionMetaData>();
final ArrayList<ExpressionMetaData> allExpressions = new ArrayList<ExpressionMetaData>();
final ExpressionMetaData[] allExpressionMetaDatas = ExpressionRegistry.getInstance().getAllExpressionMetaDatas();
for (int i = 0; i < allExpressionMetaDatas.length; i++)
{
final ExpressionMetaData metaData = allExpressionMetaDatas[i];
if (metaData.isHidden())
{
continue;
}
if (WorkspaceSettings.getInstance().isShowExpertItems() == false && metaData.isExpert())
{
continue;
}
if (WorkspaceSettings.getInstance().isShowDeprecatedItems() == false && metaData.isDeprecated())
{
continue;
}
if (Function.class.isAssignableFrom(metaData.getExpressionType()) == false)
{
allRealExpressions.add(metaData);
}
allExpressions.add(metaData);
}
Collections.sort(allRealExpressions, new GroupedMetaDataComparator());
Collections.sort(allExpressions, new GroupedMetaDataComparator());
this.expressions = allRealExpressions.toArray(new ExpressionMetaData[allRealExpressions.size()]);
this.functions = allExpressions.toArray(new ExpressionMetaData[allExpressions.size()]);
}
}