001// Copyright 2008, 2010 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007// http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.services;
016
017import org.apache.tapestry5.EventContext;
018import org.apache.tapestry5.internal.EmptyEventContext;
019import org.apache.tapestry5.internal.TapestryInternalUtils;
020import org.apache.tapestry5.internal.URLEventContext;
021import org.apache.tapestry5.ioc.internal.util.InternalUtils;
022import org.apache.tapestry5.ioc.services.TypeCoercer;
023import org.apache.tapestry5.services.ContextPathEncoder;
024import org.apache.tapestry5.services.ContextValueEncoder;
025import org.apache.tapestry5.services.URLEncoder;
026
027public class ContextPathEncoderImpl implements ContextPathEncoder
028{
029    private static final int BUFFER_SIZE = 100;
030
031    private final ContextValueEncoder valueEncoder;
032
033    private final URLEncoder urlEncoder;
034
035    private final TypeCoercer typeCoercer;
036
037    private final EventContext EMPTY = new EmptyEventContext();
038
039    public ContextPathEncoderImpl(ContextValueEncoder valueEncoder, URLEncoder urlEncoder, TypeCoercer typeCoercer)
040    {
041        this.valueEncoder = valueEncoder;
042        this.urlEncoder = urlEncoder;
043        this.typeCoercer = typeCoercer;
044    }
045
046    public String encodeValue(Object value)
047    {
048        String valueEncoded = value == null ? null : valueEncoder.toClient(value);
049
050        return urlEncoder.encode(valueEncoded);
051    }
052
053    public String encodeIntoPath(Object[] context)
054    {
055        if (context == null || context.length == 0)
056            return "";
057
058        return encodeIntoPath(new ArrayEventContext(typeCoercer, context));
059    }
060
061    public String encodeIntoPath(EventContext context)
062    {
063        assert context != null;
064        int count = context.getCount();
065
066        StringBuilder output = new StringBuilder(BUFFER_SIZE);
067
068        for (int i = 0; i < count; i++)
069        {
070            Object raw = context.get(Object.class, i);
071
072            String urlEncoded = encodeValue(raw);
073
074            if (i > 0)
075                output.append("/");
076
077            output.append(urlEncoded);
078        }
079
080        return output.toString();
081    }
082
083    public EventContext decodePath(String path)
084    {
085        if (InternalUtils.isBlank(path))
086            return EMPTY;
087
088        String[] split = TapestryInternalUtils.splitPath(path);
089
090        for (int i = 0; i < split.length; i++)
091        {
092            split[i] = urlEncoder.decode(split[i]);
093        }
094
095        return new URLEventContext(valueEncoder, split);
096    }
097}