001: /*
002: * Copyright (c) 2003 The Visigoth Software Society. All rights
003: * reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions
007: * are met:
008: *
009: * 1. Redistributions of source code must retain the above copyright
010: * notice, this list of conditions and the following disclaimer.
011: *
012: * 2. Redistributions in binary form must reproduce the above copyright
013: * notice, this list of conditions and the following disclaimer in
014: * the documentation and/or other materials provided with the
015: * distribution.
016: *
017: * 3. The end-user documentation included with the redistribution, if
018: * any, must include the following acknowledgement:
019: * "This product includes software developed by the
020: * Visigoth Software Society (http://www.visigoths.org/)."
021: * Alternately, this acknowledgement may appear in the software itself,
022: * if and wherever such third-party acknowledgements normally appear.
023: *
024: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025: * project contributors may be used to endorse or promote products derived
026: * from this software without prior written permission. For written
027: * permission, please contact visigoths@visigoths.org.
028: *
029: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030: * nor may "FreeMarker" or "Visigoth" appear in their names
031: * without prior written permission of the Visigoth Software Society.
032: *
033: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044: * SUCH DAMAGE.
045: * ====================================================================
046: *
047: * This software consists of voluntary contributions made by many
048: * individuals on behalf of the Visigoth Software Society. For more
049: * information on the Visigoth Software Society, please see
050: * http://www.visigoths.org/
051: */
052:
053: package freemarker.ext.servlet;
054:
055: import freemarker.template.*;
056: import java.util.*;
057: import javax.servlet.http.*;
058:
059: /**
060: * TemplateHashModel wrapper for a HttpServletRequest parameters.
061: * @author Attila Szegedi
062: * @version $Id: HttpRequestParametersHashModel.java,v 1.21 2005/05/05 07:50:25 vsajip Exp $
063: */
064:
065: public class HttpRequestParametersHashModel implements
066: TemplateHashModelEx {
067: private final HttpServletRequest request;
068: private List keys;
069:
070: public HttpRequestParametersHashModel(HttpServletRequest request) {
071: this .request = request;
072: }
073:
074: public TemplateModel get(String key) {
075: String value = request.getParameter(key);
076: return value == null ? null : new SimpleScalar(value);
077: }
078:
079: public boolean isEmpty() {
080: return !request.getParameterNames().hasMoreElements();
081: }
082:
083: public int size() {
084: return getKeys().size();
085: }
086:
087: public TemplateCollectionModel keys() {
088: return new SimpleCollection(getKeys().iterator());
089: }
090:
091: public TemplateCollectionModel values() {
092: final Iterator iter = getKeys().iterator();
093: return new SimpleCollection(new Iterator() {
094: public boolean hasNext() {
095: return iter.hasNext();
096: }
097:
098: public Object next() {
099: return request.getParameter((String) iter.next());
100: }
101:
102: public void remove() {
103: throw new UnsupportedOperationException();
104: }
105: });
106: }
107:
108: protected String transcode(String string) {
109: return string;
110: }
111:
112: private synchronized List getKeys() {
113: if (keys == null) {
114: keys = new ArrayList();
115: for (Enumeration enumeration = request.getParameterNames(); enumeration
116: .hasMoreElements();) {
117: keys.add(enumeration.nextElement());
118: }
119: }
120: return keys;
121: }
122: }
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