Initial revision

From-SVN: r102074

libjava/classpath/gnu/java/net/protocol/http/Headers.java

@@ -0,0 +1,369 @@
+/* Headers.java --
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.net.protocol.http;
+
+import gnu.java.net.LineInputStream;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.text.DateFormat;
+import java.text.ParseException;
+import java.util.Collection;
+import java.util.Date;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * A collection of HTTP header names and associated values.
+ * Retrieval of values is case insensitive. An iteration over the keys
+ * returns the header names in the order they were received.
+ *
+ * @author Chris Burdess (dog@gnu.org)
+ */
+public class Headers
+  implements Map
+{
+
+  static final DateFormat dateFormat = new HTTPDateFormat();
+
+  static class Header
+  {
+
+    final String name;
+
+    Header(String name)
+    {
+      if (name == null || name.length() == 0)
+        {
+          throw new IllegalArgumentException(name);
+        }
+      this.name = name;
+    }
+
+    public int hashCode()
+    {
+      return name.toLowerCase().hashCode();
+    }
+
+    public boolean equals(Object other)
+    {
+      if (other instanceof Header)
+        {
+          return ((Header) other).name.equalsIgnoreCase(name);
+        }
+      return false;
+    }
+
+    public String toString()
+    {
+      return name;
+    }
+    
+  }
+
+  static class HeaderEntry
+    implements Map.Entry
+  {
+
+    final Map.Entry entry;
+
+    HeaderEntry(Map.Entry entry)
+    {
+      this.entry = entry;
+    }
+
+    public Object getKey()
+    {
+      return ((Header) entry.getKey()).name;
+    }
+
+    public Object getValue()
+    {
+      return entry.getValue();
+    }
+
+    public Object setValue(Object value)
+    {
+      return entry.setValue(value);
+    }
+
+    public int hashCode()
+    {
+      return entry.hashCode();
+    }
+
+    public boolean equals(Object other)
+    {
+      return entry.equals(other);
+    }
+
+    public String toString()
+    {
+      return getKey().toString() + "=" + getValue();
+    }
+    
+  }
+
+  private LinkedHashMap headers;
+
+  public Headers()
+  {
+    headers = new LinkedHashMap();
+  }
+
+  public int size()
+  {
+    return headers.size();
+  }
+
+  public boolean isEmpty()
+  {
+    return headers.isEmpty();
+  }
+
+  public boolean containsKey(Object key)
+  {
+    return headers.containsKey(new Header((String) key));
+  }
+
+  public boolean containsValue(Object value)
+  {
+    return headers.containsValue(value);
+  }
+
+  public Object get(Object key)
+  {
+    return headers.get(new Header((String) key));
+  }
+
+  /**
+   * Returns the value of the specified header as a string.
+   */
+  public String getValue(String header)
+  {
+    return (String) headers.get(new Header(header));
+  }
+
+  /**
+   * Returns the value of the specified header as an integer,
+   * or -1 if the header is not present or not an integer.
+   */
+  public int getIntValue(String header)
+  {
+    String val = getValue(header);
+    if (val == null)
+      {
+        return -1;
+      }
+    try
+      {
+        return Integer.parseInt(val);
+      }
+    catch (NumberFormatException e)
+      {
+      }
+    return -1;
+  }
+
+  /**
+   * Returns the value of the specified header as a date,
+   * or <code>null</code> if the header is not present or not a date.
+   */
+  public Date getDateValue(String header)
+  {
+    String val = getValue(header);
+    if (val == null)
+      {
+        return null;
+      }
+    try
+      {
+        return dateFormat.parse(val);
+      }
+    catch (ParseException e)
+      {
+        return null;
+      }
+  }
+
+  public Object put(Object key, Object value)
+  {
+    return headers.put(new Header((String) key), value);
+  }
+
+  public Object remove(Object key)
+  {
+    return headers.remove(new Header((String) key));
+  }
+
+  public void putAll(Map t)
+  {
+    for (Iterator i = t.keySet().iterator(); i.hasNext(); )
+      {
+        String key = (String) i.next();
+        String value = (String) t.get(key);
+        headers.put(new Header(key), value);
+      }
+  }
+  
+  public void clear()
+  {
+    headers.clear();
+  }
+
+  public Set keySet()
+  {
+    Set keys = headers.keySet();
+    Set ret = new LinkedHashSet();
+    for (Iterator i = keys.iterator(); i.hasNext(); )
+      {
+        ret.add(((Header) i.next()).name);
+      }
+    return ret;
+  }
+
+  public Collection values()
+  {
+    return headers.values();
+  }
+
+  public Set entrySet()
+  {
+    Set entries = headers.entrySet();
+    Set ret = new LinkedHashSet();
+    for (Iterator i = entries.iterator(); i.hasNext(); )
+      {
+        Map.Entry entry = (Map.Entry) i.next();
+        ret.add(new HeaderEntry(entry));
+      }
+    return ret;
+  }
+
+  public boolean equals(Object other)
+  {
+    return headers.equals(other);
+  }
+
+  public int hashCode()
+  {
+    return headers.hashCode();
+  }
+
+  /**
+   * Parse the specified input stream, adding headers to this collection.
+   */
+  public void parse(InputStream in)
+    throws IOException
+  {
+    LineInputStream lin = (in instanceof LineInputStream) ?
+      (LineInputStream) in : new LineInputStream(in);
+    
+    String name = null;
+    StringBuffer value = new StringBuffer();
+    while (true)
+      {
+        String line = lin.readLine();
+        if (line == null)
+          {
+            if (name != null)
+              {
+                addValue(name, value.toString());
+              }
+            break;
+          }
+        int len = line.length();
+        if (len < 2)
+          {
+            if (name != null)
+              {
+                addValue(name, value.toString());
+              }
+            break;
+          }
+        char c1 = line.charAt(0);
+        if (c1 == ' ' || c1 == '\t')
+          {
+            // Continuation
+	    int last = len - 1;
+	    if (line.charAt(last) != '\r')
+	      ++last;
+            value.append(line.substring(0, last));
+          }
+        else
+          {
+            if (name != null)
+              {
+                addValue(name, value.toString());
+              }
+            
+            int di = line.indexOf(':');
+            name = line.substring(0, di);
+            value.setLength(0);
+            do
+              {
+                di++;
+              }
+            while (di < len && line.charAt(di) == ' ');
+	    int last = len - 1;
+	    if (line.charAt(last) != '\r')
+	      ++last;
+            value.append(line.substring(di, last));
+          }
+      }
+  }
+  
+  private void addValue(String name, String value)
+  {
+    Header key = new Header(name);
+    String old = (String) headers.get(key);
+    if (old == null)
+      {
+        headers.put(key, value);
+      }
+    else
+      {
+        headers.put(key, old + ", " + value);
+      }
+  }
+  
+}
+