/*--

 * Copyright 2006 René M. de Bloois

 *

 * 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 solidstack.query;



import java.io.IOException;

import java.util.ArrayList;

import java.util.BitSet;

import java.util.List;



import solidstack.template.EncodingWriter;





/**

 * A writer that keeps values separate from the string segments.

 *

 * @author René M. de Bloois

 */

public class QueryEncodingWriter implements EncodingWriter

{

	private List< Object > values = new ArrayList< Object >();

	private BitSet isValue = new BitSet();



	//@Override

	public void write( String s )

	{

		if( s != null && s.length() > 0 )

			this.values.add( s );

	}



	//@Override

	public void writeEncoded( Object o ) throws IOException

	{

		this.isValue.set( this.values.size() );

		this.values.add( o );

	}



	public boolean stringsOnly()

	{

		return false;

	}



	/**

	 * Returns the string segments and the values.

	 *

	 * @return An array of string segments (String) and the values (unknown Object).

	 */

	public List< Object > getValues()

	{

		return this.values;

	}



	/**

	 * Returns a bitset that indicates which indexes in the {@link #getValues()} list is a value.

	 *

	 * @return A bitset that indicates which indexes in the {@link #getValues()} list is a value.

	 */

	public BitSet getIsValue()

	{

		return this.isValue;

	}



	@Override

	public String toString()

	{

		StringBuilder result = new StringBuilder();

		int len = this.values.size();

		for( int i = 0; i < len; i++ )

		{

			if( this.isValue.get( i ) )

				result.append( this.values.get( i ).toString() );

			else

				result.append( (String)this.values.get( i ) );

		}

		return result.toString();

	}



	public void flush() throws IOException

	{

		// Nothing to flush

	}

}