    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005// http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.internal.services;
    014
    015import org.apache.tapestry5.SymbolConstants;
    016import org.apache.tapestry5.http.ContentType;
    017import org.apache.tapestry5.http.TapestryHttpSymbolConstants;
    018import org.apache.tapestry5.http.services.Response;
    019import org.apache.tapestry5.internal.InternalConstants;
    020import org.apache.tapestry5.ioc.annotations.Symbol;
    021import org.apache.tapestry5.json.JSONCollection;
    022import org.apache.tapestry5.services.ComponentEventResultProcessor;
    023
    024import java.io.IOException;
    025import java.io.PrintWriter;
    026
    027public class JSONCollectionEventResultProcessor implements ComponentEventResultProcessor<JSONCollection>
    028{
    029    private final Response response;
    030
    031    private final boolean compactJSON;
    032
    033    private final ContentType contentType;
    034
    035    public JSONCollectionEventResultProcessor(Response response,
    036
    037                                         @Symbol(TapestryHttpSymbolConstants.CHARSET)
    038                                         String outputEncoding,
    039
    040                                         @Symbol(SymbolConstants.COMPACT_JSON)
    041                                         boolean compactJSON)
    042    {
    043        this.response = response;
    044        this.compactJSON = compactJSON;
    045
    046        contentType = new ContentType(InternalConstants.JSON_MIME_TYPE).withCharset(outputEncoding);
    047    }
    048
    049    public void processResultValue(JSONCollection value) throws IOException
    050    {
    051        PrintWriter pw = response.getPrintWriter(contentType.toString());
    052
    053        value.print(pw, compactJSON);
    054
    055        pw.close();
    056    }
    057}