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// Copyright (C) 2009 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 com.google.gimd;
import com.google.gimd.text.Formatter
import scala.collection.immutable.TreeSet
import scala.collection.Sorted
object Message {
val empty: Message = new Message(TreeSet.empty)
def apply(fields: Iterable[Field]) = empty ++ fields
def apply(fields: Field*) = new Message(TreeSet(fields: _*))
}
//TODO Message should allow to subclass itself only in gimd package but I don't know
//how to do that right now
class Message(private val fields: Sorted[Field, Field])
extends Ordered[Message] with Sorted[Field, Field] {
override def equals(that: Any) = that match {
case that: Message => compare(that) == 0
case _ => false
}
override def compare(that: Message) = iterable2ordered(this.fields).compare(that.fields)
override def compare(k0: Field, k1: Field) = k0.compare(k1)
def +(field: Field): Message = {
val buffer = new MessageBuffer
buffer ++= this
buffer += field
buffer.readOnly
}
def ++(that: Iterable[Field]): Message = {
val buffer = new MessageBuffer
buffer ++= this
buffer ++= that
buffer.readOnly
}
override def rangeImpl(from: Option[Field], until: Option[Field]) = fields.rangeImpl(from, until)
override def keySet = fields.keySet
override def lastKey = fields.lastKey
override def firstKey = fields.firstKey
override def elements = fields.elements
def iterator = new MessageIterator(this)
/**
* Returns all fields having name equal to given.
*
* This implementation is efficient because it does take advantage of the fact that Message is
* Sorted collection so operation is performed in O(log(n)) time.
*/
def all(name: String): Sorted[Field,Field] = range(MinimumField(name), MaximumField(name))
/**
* @throws Predef.NoSuchElementException if there is more than one field with given name
*/
def oneOption(name: String): Option[Field] = all(name).take(2).toList match {
case Nil => None
case x :: Nil => Some(x)
case x :: xs => throw new NoSuchElementException("There are more than one " +
"fields named " + name)
}
/**
* Returns field with passed name.
*
* @throws Predef.NoSuchElementException if either there's no element with given name or
* there are more than one
*/
def one(name: String): Field = oneOption(name).get
override def toString = Formatter.format(this)
}
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