com.subgraph.vega.ui.httpeditor.parser.HttpResponseParser.java Source code

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Here is the source code for com.subgraph.vega.ui.httpeditor.parser.HttpResponseParser.java

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/*******************************************************************************
 * Copyright (c) 2011 Subgraph.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Subgraph - initial API and implementation
 ******************************************************************************/
package com.subgraph.vega.ui.httpeditor.parser;

import java.io.UnsupportedEncodingException;

import org.apache.http.StatusLine;
import org.apache.http.entity.StringEntity;
import org.apache.http.message.BasicLineParser;
import org.apache.http.message.LineParser;
import org.apache.http.message.ParserCursor;
import org.apache.http.util.CharArrayBuffer;

import com.subgraph.vega.api.http.requests.IHttpRequestEngine;
import com.subgraph.vega.api.http.requests.IHttpResponseBuilder;

/**
 * Parser to parse user-entered responsesinto an IHttpResponseBuilder.
 */
public class HttpResponseParser extends ParserBase {
    final private IHttpResponseBuilder builder;
    private final boolean parseInlineEntities;

    public HttpResponseParser(final IHttpResponseBuilder builder, boolean parseInlineEntities) {
        this.builder = builder;
        this.parseInlineEntities = parseInlineEntities;
    }

    public HttpResponseParser(IHttpRequestEngine requestEngine) {
        this(requestEngine.createResponseBuilder(), true);
    }

    /**
     * Parse a HTTP response in a string.
     * 
     * @param content HTTP response string.
     * @return HttpResponse, or null if the given HTTP response was empty. 
     * @throws UnsupportedEncodingException
     */
    public void parseResponse(final String content) throws UnsupportedEncodingException {
        final CharArrayBuffer buf = new CharArrayBuffer(0);
        buf.append(content);
        final ParserCursor bufCursor = new ParserCursor(0, buf.length());
        final LineParser parser = new BasicLineParser();

        if (parseStatusLine(parser, builder, buf, bufCursor) < 0) {
            return;
        }
        builder.clearHeaders();
        parseHeaders(parser, builder, buf, bufCursor);
        if (!bufCursor.atEnd() && parseInlineEntities) {
            StringEntity entity = new StringEntity(buf.substring(bufCursor.getPos(), bufCursor.getUpperBound()));
            builder.setEntity(entity);
        }
    }

    public IHttpResponseBuilder getResponseBuilder() {
        return builder;
    }

    /**
     * Read and parse the response line.
     * 
     * @param parser HC LineParser.
     * @param builder HTTP response builder.
     * @param buf
     * @param bufCursor
     * @return
     */
    private int parseStatusLine(final LineParser parser, final IHttpResponseBuilder builder,
            final CharArrayBuffer buf, final ParserCursor bufCursor) {
        final CharArrayBuffer lnBuf = new CharArrayBuffer(0);
        if (readLine(buf, bufCursor, lnBuf) < 1) {
            // no data!
            return -1;
        }
        final ParserCursor lnCursor = new ParserCursor(0, lnBuf.length());

        final StatusLine statusLine = parser.parseStatusLine(lnBuf, lnCursor);
        builder.setFromStatusLine(statusLine);

        return 0;
    }

}