Java tutorial
/* * Copyright (C) 2006 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.mycard.net.network; import java.util.ArrayList; import org.apache.http.HeaderElement; import org.apache.http.entity.ContentLengthStrategy; import org.apache.http.message.BasicHeaderValueParser; import org.apache.http.message.ParserCursor; import org.apache.http.protocol.HTTP; import org.apache.http.util.CharArrayBuffer; /** * Manages received headers * * {@hide} */ public final class Headers { /** * indicate HTTP 1.0 connection close after the response */ public final static int CONN_CLOSE = 1; /** * indicate HTTP 1.1 connection keep alive */ public final static int CONN_KEEP_ALIVE = 2; // initial values. public final static int NO_CONN_TYPE = 0; public final static long NO_TRANSFER_ENCODING = 0; public final static long NO_CONTENT_LENGTH = -1; // header strings public final static String TRANSFER_ENCODING = "transfer-encoding"; public final static String CONTENT_LEN = "content-length"; public final static String CONTENT_TYPE = "content-type"; public final static String CONTENT_ENCODING = "content-encoding"; public final static String CONN_DIRECTIVE = "connection"; public final static String LOCATION = "location"; public final static String PROXY_CONNECTION = "proxy-connection"; public final static String WWW_AUTHENTICATE = "www-authenticate"; public final static String PROXY_AUTHENTICATE = "proxy-authenticate"; public final static String CONTENT_DISPOSITION = "content-disposition"; public final static String ACCEPT_RANGES = "accept-ranges"; public final static String EXPIRES = "expires"; public final static String CACHE_CONTROL = "cache-control"; public final static String LAST_MODIFIED = "last-modified"; public final static String ETAG = "etag"; public final static String SET_COOKIE = "set-cookie"; public final static String PRAGMA = "pragma"; public final static String REFRESH = "refresh"; // following hash are generated by String.hashCode() private final static int HASH_TRANSFER_ENCODING = 1274458357; private final static int HASH_CONTENT_LEN = -1132779846; private final static int HASH_CONTENT_TYPE = 785670158; private final static int HASH_CONTENT_ENCODING = 2095084583; private final static int HASH_CONN_DIRECTIVE = -775651618; private final static int HASH_LOCATION = 1901043637; private final static int HASH_PROXY_CONNECTION = 285929373; private final static int HASH_WWW_AUTHENTICATE = -243037365; private final static int HASH_PROXY_AUTHENTICATE = -301767724; private final static int HASH_CONTENT_DISPOSITION = -1267267485; private final static int HASH_ACCEPT_RANGES = 1397189435; private final static int HASH_EXPIRES = -1309235404; private final static int HASH_CACHE_CONTROL = -208775662; private final static int HASH_LAST_MODIFIED = 150043680; private final static int HASH_ETAG = 3123477; private final static int HASH_SET_COOKIE = 1237214767; private final static int HASH_PRAGMA = -980228804; private final static int HASH_REFRESH = 1085444827; // keep any headers that require direct access in a presized // string array private final static int IDX_TRANSFER_ENCODING = 0; private final static int IDX_CONTENT_LEN = 1; private final static int IDX_CONTENT_TYPE = 2; private final static int IDX_CONTENT_ENCODING = 3; private final static int IDX_CONN_DIRECTIVE = 4; private final static int IDX_LOCATION = 5; private final static int IDX_PROXY_CONNECTION = 6; private final static int IDX_WWW_AUTHENTICATE = 7; private final static int IDX_PROXY_AUTHENTICATE = 8; private final static int IDX_CONTENT_DISPOSITION = 9; private final static int IDX_ACCEPT_RANGES = 10; private final static int IDX_EXPIRES = 11; private final static int IDX_CACHE_CONTROL = 12; private final static int IDX_LAST_MODIFIED = 13; private final static int IDX_ETAG = 14; private final static int IDX_SET_COOKIE = 15; private final static int IDX_PRAGMA = 16; private final static int IDX_REFRESH = 17; private final static int HEADER_COUNT = 18; /* parsed values */ private long transferEncoding; private long contentLength; // Content length of the incoming data private int connectionType; private ArrayList<String> cookies = new ArrayList<String>(2); private String[] mHeaders = new String[HEADER_COUNT]; private final static String[] sHeaderNames = { TRANSFER_ENCODING, CONTENT_LEN, CONTENT_TYPE, CONTENT_ENCODING, CONN_DIRECTIVE, LOCATION, PROXY_CONNECTION, WWW_AUTHENTICATE, PROXY_AUTHENTICATE, CONTENT_DISPOSITION, ACCEPT_RANGES, EXPIRES, CACHE_CONTROL, LAST_MODIFIED, ETAG, SET_COOKIE, PRAGMA, REFRESH }; // Catch-all for headers not explicitly handled private ArrayList<String> mExtraHeaderNames = new ArrayList<String>(4); private ArrayList<String> mExtraHeaderValues = new ArrayList<String>(4); public Headers() { transferEncoding = NO_TRANSFER_ENCODING; contentLength = NO_CONTENT_LENGTH; connectionType = NO_CONN_TYPE; } public void parseHeader(CharArrayBuffer buffer) { int pos = CharArrayBuffers.setLowercaseIndexOf(buffer, ':'); if (pos == -1) { return; } String name = buffer.substringTrimmed(0, pos); if (name.length() == 0) { return; } pos++; String val = buffer.substringTrimmed(pos, buffer.length()); // if (HttpLog.LOGV) { // HttpLog.v("hdr " + buffer.length() + " " + buffer); // } switch (name.hashCode()) { case HASH_TRANSFER_ENCODING: if (name.equals(TRANSFER_ENCODING)) { mHeaders[IDX_TRANSFER_ENCODING] = val; HeaderElement[] encodings = BasicHeaderValueParser.DEFAULT.parseElements(buffer, new ParserCursor(pos, buffer.length())); // The chunked encoding must be the last one applied RFC2616, // 14.41 int len = encodings.length; if (HTTP.IDENTITY_CODING.equalsIgnoreCase(val)) { transferEncoding = ContentLengthStrategy.IDENTITY; } else if ((len > 0) && (HTTP.CHUNK_CODING.equalsIgnoreCase(encodings[len - 1].getName()))) { transferEncoding = ContentLengthStrategy.CHUNKED; } else { transferEncoding = ContentLengthStrategy.IDENTITY; } } break; case HASH_CONTENT_LEN: if (name.equals(CONTENT_LEN)) { mHeaders[IDX_CONTENT_LEN] = val; try { contentLength = Long.parseLong(val); } catch (NumberFormatException e) { //if (Config.LOGV) { // Log.v(LOGTAG, "Headers.headers(): error parsing" // + " content length: " + buffer.toString()); // } } } break; case HASH_CONTENT_TYPE: if (name.equals(CONTENT_TYPE)) { mHeaders[IDX_CONTENT_TYPE] = val; } break; case HASH_CONTENT_ENCODING: if (name.equals(CONTENT_ENCODING)) { mHeaders[IDX_CONTENT_ENCODING] = val; } break; case HASH_CONN_DIRECTIVE: if (name.equals(CONN_DIRECTIVE)) { mHeaders[IDX_CONN_DIRECTIVE] = val; setConnectionType(buffer, pos); } break; case HASH_LOCATION: if (name.equals(LOCATION)) { mHeaders[IDX_LOCATION] = val; } break; case HASH_PROXY_CONNECTION: if (name.equals(PROXY_CONNECTION)) { mHeaders[IDX_PROXY_CONNECTION] = val; setConnectionType(buffer, pos); } break; case HASH_WWW_AUTHENTICATE: if (name.equals(WWW_AUTHENTICATE)) { mHeaders[IDX_WWW_AUTHENTICATE] = val; } break; case HASH_PROXY_AUTHENTICATE: if (name.equals(PROXY_AUTHENTICATE)) { mHeaders[IDX_PROXY_AUTHENTICATE] = val; } break; case HASH_CONTENT_DISPOSITION: if (name.equals(CONTENT_DISPOSITION)) { mHeaders[IDX_CONTENT_DISPOSITION] = val; } break; case HASH_ACCEPT_RANGES: if (name.equals(ACCEPT_RANGES)) { mHeaders[IDX_ACCEPT_RANGES] = val; } break; case HASH_EXPIRES: if (name.equals(EXPIRES)) { mHeaders[IDX_EXPIRES] = val; } break; case HASH_CACHE_CONTROL: if (name.equals(CACHE_CONTROL)) { mHeaders[IDX_CACHE_CONTROL] = val; } break; case HASH_LAST_MODIFIED: if (name.equals(LAST_MODIFIED)) { mHeaders[IDX_LAST_MODIFIED] = val; } break; case HASH_ETAG: if (name.equals(ETAG)) { mHeaders[IDX_ETAG] = val; } break; case HASH_SET_COOKIE: if (name.equals(SET_COOKIE)) { mHeaders[IDX_SET_COOKIE] = val; cookies.add(val); } break; case HASH_PRAGMA: if (name.equals(PRAGMA)) { mHeaders[IDX_PRAGMA] = val; } break; case HASH_REFRESH: if (name.equals(REFRESH)) { mHeaders[IDX_REFRESH] = val; } break; default: mExtraHeaderNames.add(name); mExtraHeaderValues.add(val); } } public long getTransferEncoding() { return transferEncoding; } public long getContentLength() { return contentLength; } public int getConnectionType() { return connectionType; } public String getContentType() { return mHeaders[IDX_CONTENT_TYPE]; } public String getContentEncoding() { return mHeaders[IDX_CONTENT_ENCODING]; } public String getLocation() { return mHeaders[IDX_LOCATION]; } public String getWwwAuthenticate() { return mHeaders[IDX_WWW_AUTHENTICATE]; } public String getProxyAuthenticate() { return mHeaders[IDX_PROXY_AUTHENTICATE]; } public String getContentDisposition() { return mHeaders[IDX_CONTENT_DISPOSITION]; } public String getAcceptRanges() { return mHeaders[IDX_ACCEPT_RANGES]; } public String getExpires() { return mHeaders[IDX_EXPIRES]; } public String getCacheControl() { return mHeaders[IDX_CACHE_CONTROL]; } public String getLastModified() { return mHeaders[IDX_LAST_MODIFIED]; } public String getEtag() { return mHeaders[IDX_ETAG]; } public ArrayList<String> getSetCookie() { return this.cookies; } public String getPragma() { return mHeaders[IDX_PRAGMA]; } public String getRefresh() { return mHeaders[IDX_REFRESH]; } public void setContentLength(long value) { this.contentLength = value; } public void setContentType(String value) { mHeaders[IDX_CONTENT_TYPE] = value; } public void setContentEncoding(String value) { mHeaders[IDX_CONTENT_ENCODING] = value; } public void setLocation(String value) { mHeaders[IDX_LOCATION] = value; } public void setWwwAuthenticate(String value) { mHeaders[IDX_WWW_AUTHENTICATE] = value; } public void setProxyAuthenticate(String value) { mHeaders[IDX_PROXY_AUTHENTICATE] = value; } public void setContentDisposition(String value) { mHeaders[IDX_CONTENT_DISPOSITION] = value; } public void setAcceptRanges(String value) { mHeaders[IDX_ACCEPT_RANGES] = value; } public void setExpires(String value) { mHeaders[IDX_EXPIRES] = value; } public void setCacheControl(String value) { mHeaders[IDX_CACHE_CONTROL] = value; } public void setLastModified(String value) { mHeaders[IDX_LAST_MODIFIED] = value; } public void setEtag(String value) { mHeaders[IDX_ETAG] = value; } public interface HeaderCallback { public void header(String name, String value); } public String getRaw(String name) { for (int i = 0; i < mExtraHeaderNames.size(); i++) { if (mExtraHeaderNames.get(i).compareToIgnoreCase(name) == 0) { return mExtraHeaderValues.get(i); } } return null; } /** * Reports all non-null headers to the callback */ public void getHeaders(HeaderCallback hcb) { for (int i = 0; i < HEADER_COUNT; i++) { String h = mHeaders[i]; if (h != null) { hcb.header(sHeaderNames[i], h); } } int extraLen = mExtraHeaderNames.size(); for (int i = 0; i < extraLen; i++) { // if (Config.LOGV) { //HttpLog.v("Headers.getHeaders() extra: " + i + " " + // mExtraHeaderNames.get(i) + " " + mExtraHeaderValues.get(i)); // } hcb.header(mExtraHeaderNames.get(i), mExtraHeaderValues.get(i)); } } private void setConnectionType(CharArrayBuffer buffer, int pos) { if (CharArrayBuffers.containsIgnoreCaseTrimmed(buffer, pos, HTTP.CONN_CLOSE)) { connectionType = CONN_CLOSE; } else if (CharArrayBuffers.containsIgnoreCaseTrimmed(buffer, pos, HTTP.CONN_KEEP_ALIVE)) { connectionType = CONN_KEEP_ALIVE; } } }