/src/solidstack/query/QueryEncodingWriter.java

 1/*--
 2 * Copyright 2006 René M. de Bloois
 3 *
 4 * Licensed under the Apache License, Version 2.0 (the "License");
 5 * you may not use this file except in compliance with the License.
 6 * You may obtain a copy of the License at
 7 *
 8 *     http://www.apache.org/licenses/LICENSE-2.0
 9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package solidstack.query;
18
19import java.io.IOException;
20import java.util.ArrayList;
21import java.util.BitSet;
22import java.util.List;
23
24import solidstack.template.EncodingWriter;
25
26
27/**
28 * A writer that keeps values separate from the string segments.
29 *
30 * @author René M. de Bloois
31 */
32public class QueryEncodingWriter implements EncodingWriter
33{
34	private List< Object > values = new ArrayList< Object >();
35	private BitSet isValue = new BitSet();
36
37	//@Override
38	public void write( String s )
39	{
40		if( s != null && s.length() > 0 )
41			this.values.add( s );
42	}
43
44	//@Override
45	public void writeEncoded( Object o ) throws IOException
46	{
47		this.isValue.set( this.values.size() );
48		this.values.add( o );
49	}
50
51	public boolean stringsOnly()
52	{
53		return false;
54	}
55
56	/**
57	 * Returns the string segments and the values.
58	 *
59	 * @return An array of string segments (String) and the values (unknown Object).
60	 */
61	public List< Object > getValues()
62	{
63		return this.values;
64	}
65
66	/**
67	 * Returns a bitset that indicates which indexes in the {@link #getValues()} list is a value.
68	 *
69	 * @return A bitset that indicates which indexes in the {@link #getValues()} list is a value.
70	 */
71	public BitSet getIsValue()
72	{
73		return this.isValue;
74	}
75
76	@Override
77	public String toString()
78	{
79		StringBuilder result = new StringBuilder();
80		int len = this.values.size();
81		for( int i = 0; i < len; i++ )
82		{
83			if( this.isValue.get( i ) )
84				result.append( this.values.get( i ).toString() );
85			else
86				result.append( (String)this.values.get( i ) );
87		}
88		return result.toString();
89	}
90
91	public void flush() throws IOException
92	{
93		// Nothing to flush
94	}
95}