/*******************************************************************************
 * Copyright (c) 2004, 2007 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/

package org.eclipse.birt.report.engine.data.dte;

import java.math.BigDecimal;
import java.sql.Blob;
import java.util.Date;

import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.core.script.ScriptContext;
import org.eclipse.birt.data.engine.api.IBaseExpression;
import org.eclipse.birt.data.engine.api.IBaseQueryResults;
import org.eclipse.birt.data.engine.api.IQueryResults;
import org.eclipse.birt.data.engine.api.IResultIterator;
import org.eclipse.birt.data.engine.api.IResultMetaData;
import org.eclipse.birt.report.engine.api.DataSetID;
import org.eclipse.birt.report.engine.extension.IBaseResultSet;
import org.eclipse.birt.report.engine.extension.IQueryResultSet;
import org.mozilla.javascript.Scriptable;

public class SingleQueryResultSet extends QueryResultSet
{

	private IQueryResultSet rset;
	boolean isFirstCalled = true;

	public SingleQueryResultSet( IQueryResultSet rsets )
	{
		this.rset = rsets;
	}

	public void close( )
	{
		// do nothing in close( )
	}

	public DataSetID getID( )
	{
		return rset.getID( );
	}

	public IBaseQueryResults getQueryResults( )
	{
		return rset.getQueryResults( );
	}

	public IResultIterator getResultIterator( )
	{
		IResultIterator resultIterator = new SingleRowIterator( rset
				.getResultIterator( ) );
		return resultIterator;
	}

	public IResultMetaData getResultMetaData( ) throws BirtException
	{
		return rset.getResultMetaData( );
	}

	public boolean next( ) throws BirtException
	{
		if ( isFirstCalled )
		{
			isFirstCalled = false;
			return true;
		}
		return false;
	}

	public boolean isEmpty( ) throws BirtException
	{
		return rset.isEmpty( );
	}

	public boolean isFirst( ) throws BirtException
	{
		return rset.isFirst( );
	}

	public boolean isBeforeFirst( ) throws BirtException
	{
		return rset.isBeforeFirst( );
	}

	public Object evaluate( String expr ) throws BirtException
	{
		return rset.evaluate( expr );
	}

	public Object evaluate( IBaseExpression expr ) throws BirtException
	{
		return rset.evaluate( expr );
	}

	public IBaseResultSet getParent( )
	{
		return rset;
	}

	public String getRawID( ) throws BirtException
	{
		return rset.getRawID( );
	}

	public int getType( )
	{
		return rset.getType( );
	}

	public BigDecimal getBigDecimal( String name ) throws BirtException
	{
		return rset.getBigDecimal( name );
	}

	public Blob getBlob( String name ) throws BirtException
	{
		return rset.getBlob( name );
	}

	public Boolean getBoolean( String name ) throws BirtException
	{
		return rset.getBoolean( name );
	}

	public byte[] getBytes( String name ) throws BirtException
	{
		return rset.getBytes( name );
	}

	public Date getDate( String name ) throws BirtException
	{
		return rset.getDate( name );
	}

	public Double getDouble( String name ) throws BirtException
	{
		return rset.getDouble( name );
	}

	public int getEndingGroupLevel( ) throws BirtException
	{
		return -1;
	}

	public String getGroupId( int groupLevel )
	{
		return null;
	}

	public Integer getInteger( String name ) throws BirtException
	{
		return rset.getInteger( name );
	}

	public long getRowIndex( )
	{
		return rset.getRowIndex( );
	}

	public int getStartingGroupLevel( ) throws BirtException
	{
		return -1;
	}

	public String getString( String name ) throws BirtException
	{
		return rset.getString( name );
	}

	public Object getValue( String name ) throws BirtException
	{
		return rset.getValue( name );
	}

	public boolean skipTo( long rowIndex ) throws BirtException
	{
		return false;
	}

	public String getQueryResultsID( )
	{
		if ( rset instanceof QueryResultSet )
			return ( (QueryResultSet) rset ).getQueryResultsID( );
		return null;
	}

	private class SingleRowIterator implements IResultIterator
	{

		private boolean isFirstCalled = true;
		IResultIterator iter = null;

		public SingleRowIterator( IResultIterator iter )
		{
			this.iter = iter;
		}

		public boolean next( )
		{
			if ( isFirstCalled )
			{
				isFirstCalled = false;
				return true;
			}
			return false;
		}

		public void close( ) throws BirtException
		{
			// do nothing in close( )
		}

		public boolean findGroup( Object[] groupKeyValues )
				throws BirtException
		{
			return false;
		}

		public BigDecimal getBigDecimal( String name ) throws BirtException
		{
			return iter.getBigDecimal( name );
		}

		public Blob getBlob( String name ) throws BirtException
		{
			return iter.getBlob( name );
		}

		public Boolean getBoolean( String name ) throws BirtException
		{
			return iter.getBoolean( name );
		}

		public byte[] getBytes( String name ) throws BirtException
		{
			return iter.getBytes( name );
		}

		public Date getDate( String name ) throws BirtException
		{
			return iter.getDate( name );
		}

		public Double getDouble( String name ) throws BirtException
		{
			return iter.getDouble( name );
		}

		public int getEndingGroupLevel( ) throws BirtException
		{
			return -1;
		}

		public Integer getInteger( String name ) throws BirtException
		{
			return iter.getInteger( name );
		}

		public IQueryResults getQueryResults( )
		{
			return iter.getQueryResults( );
		}

		public IResultMetaData getResultMetaData( ) throws BirtException
		{
			return iter.getResultMetaData( );
		}

		public int getRowId( ) throws BirtException
		{
			return iter.getRowId( );
		}

		public int getRowIndex( ) throws BirtException
		{
			return iter.getRowIndex( );
		}

		public Scriptable getScope( )
		{
			return iter.getScope( );
		}

		public IResultIterator getSecondaryIterator( String subQueryName,
				Scriptable scope ) throws BirtException
		{
			return null;
		}

		public IResultIterator getSecondaryIterator( ScriptContext scriptContext,
				String subQueryName ) throws BirtException
		{
			return null;
		}

		public int getStartingGroupLevel( ) throws BirtException
		{
			return -1;
		}

		public String getString( String name ) throws BirtException
		{
			return iter.getString( name );
		}

		public Object getValue( String name ) throws BirtException
		{
			return iter.getValue( name );
		}

		public boolean isEmpty( ) throws BirtException
		{
			return iter.isEmpty( );
		}

		public void moveTo( int rowIndex ) throws BirtException
		{
		}

		public void skipToEnd( int groupLevel ) throws BirtException
		{
		}

		public boolean isBeforeFirst( ) throws BirtException
		{
			return this.iter.isBeforeFirst( );
		}

		public boolean isFirst( ) throws BirtException
		{
			return this.iter.isFirst( );
		}
	}

}
