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The RestFixture is a FitNesse (http://fitnesse.org) fixture that allows developers and/or product owners to write test fixtures for REST services with simplicity in mind. The idea is to write tests that are self documenting and easy to write and read, without the need to write Java code. The fixture allows test writers to express tests as actions (any of the allowed HTTP methods) to operate on resource URIs and express expectations on the content of the return code, headers and body. All without writing one single line of Java code. And it also works as a living/executable documentation of the API.

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/*  Copyright 2012 Fabrizio Cannizzo
 *
 *  This file is part of RestFixture.
 *
 *  RestFixture (http://code.google.com/p/rest-fixture/) is free software:
 *  you can redistribute it and/or modify it under the terms of the
 *  GNU Lesser General Public License as published by the Free Software Foundation,
 *  either version 3 of the License, or (at your option) any later version.
 *
 *  RestFixture is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with RestFixture.  If not, see .
 *
 *  If you want to contact the author please leave a comment here
 *  http://smartrics.blogspot.com/2008/08/get-fitnesse-with-some-rest.html
 */
package smartrics.rest.fitnesse.fixture.support;

import java.util.Map;

import javax.xml.xpath.XPathConstants;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import smartrics.rest.client.RestResponse;
import smartrics.rest.fitnesse.fixture.RunnerVariablesProvider;

/**
 * Handles body of the last response on behalf of LET in RestFixture.
 * 
 * @author smartrics
 * 
 */
public class LetBodyHandler implements LetHandler {

    @Override
    public String handle(RunnerVariablesProvider variablesProvider,
    		RestResponse response, Object expressionContext, String expression) {
        @SuppressWarnings("unchecked")
        Map namespaceContext = (Map) expressionContext;
        String contentTypeString = response.getContentType();
        String charset = response.getCharset();
        ContentType contentType = ContentType.parse(contentTypeString);
        BodyTypeAdapter bodyTypeAdapter = new BodyTypeAdapterFactory(variablesProvider)
        .getBodyTypeAdapter(contentType, charset);
        String body = bodyTypeAdapter.toXmlString(response.getBody());
        if (body == null) {
            return null;
        }
        String val = null;
        try {
            NodeList list = Tools.extractXPath(namespaceContext, expression, body);
            Node item = list.item(0);
            if (item != null) {
                val = item.getTextContent();
            }
        } catch (IllegalArgumentException e) {
            // ignore - may be that it's evaluating to a string
            val = (String) Tools.extractXPath(namespaceContext, expression, body, XPathConstants.STRING, charset);
        }
        if (val != null) {
            val = val.trim();
        }
        return val;
    }
}