Reorganize to go get will work

This makes almost no changes to source, but touches every almost file.

Also fixes error in gremlin test code.

graph/triplestore.go

@@ -0,0 +1,119 @@
+// Copyright 2014 The Cayley Authors. All rights reserved.
+//
+// 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 graph
+
+// Defines the TripleStore interface. Every backing store must implement at
+// least this interface.
+//
+// Most of these are pretty straightforward. As long as we can surface this
+// interface, the rest of the stack will "just work" and we can connect to any
+// triple backing store we prefer.
+
+import (
+	"github.com/barakmich/glog"
+)
+
+// Defines an opaque "triple store value" type. However the backend wishes to
+// implement it, a TSVal is merely a token to a triple or a node that the backing
+// store itself understands, and the base iterators pass around.
+//
+// For example, in a very traditional, graphd-style graph, these are int64s
+// (guids of the primitives). In a very direct sort of graph, these could be
+// pointers to structs, or merely triples, or whatever works best for the
+// backing store.
+type TSVal interface{}
+
+type TripleStore interface {
+	// Add a triple to the store.
+	AddTriple(*Triple)
+
+	// Add a set of triples to the store, atomically if possible.
+	AddTripleSet([]*Triple)
+
+	// Removes a triple matching the given one  from the database,
+	// if it exists. Does nothing otherwise.
+	RemoveTriple(*Triple)
+
+	// Given an opaque token, returns the triple for that token from the store.
+	GetTriple(TSVal) *Triple
+
+	// Given a direction and a token, creates an iterator of links which have
+	// that node token in that directional field.
+	GetTripleIterator(string, TSVal) Iterator
+
+	// Returns an iterator enumerating all nodes in the graph.
+	GetNodesAllIterator() Iterator
+
+	// Returns an iterator enumerating all links in the graph.
+	GetTriplesAllIterator() Iterator
+
+	// Given a node ID, return the opaque token used by the TripleStore
+	// to represent that id.
+	GetIdFor(string) TSVal
+
+	// Given an opaque token, return the node that it represents.
+	GetNameFor(TSVal) string
+
+	// Returns the number of triples currently stored.
+	Size() int64
+
+	// Creates a Fixed iterator which can compare TSVals
+	MakeFixed() *FixedIterator
+
+	// Optimize an iterator in the context of the triple store.
+	// Suppose we have a better index for the passed tree; this
+	// gives the TripleStore the oppotunity to replace it
+	// with a more efficient iterator.
+	OptimizeIterator(it Iterator) (Iterator, bool)
+
+	// Close the triple store and clean up. (Flush to disk, cleanly
+	// sever connections, etc)
+	Close()
+
+	// Convienence function for speed. Given a triple token and a direction
+	// return the node token for that direction. Sometimes, a TripleStore
+	// can do this without going all the way to the backing store, and
+	// gives the TripleStore the opportunity to make this optimization.
+	//
+	// Iterators will call this. At worst, a valid implementation is
+	// self.GetIdFor(self.GetTriple(triple_id).Get(dir))
+	GetTripleDirection(triple_id TSVal, dir string) TSVal
+}
+
+type OptionsDict map[string]interface{}
+
+func (d OptionsDict) GetIntKey(key string) (int, bool) {
+	if val, ok := d[key]; ok {
+		switch vv := val.(type) {
+		case float64:
+			return int(vv), true
+		default:
+			glog.Fatalln("Invalid", key, "parameter type from config.")
+		}
+	}
+	return 0, false
+}
+
+func (d OptionsDict) GetStringKey(key string) (string, bool) {
+	if val, ok := d[key]; ok {
+		switch vv := val.(type) {
+		case string:
+			return vv, true
+		default:
+			glog.Fatalln("Invalid", key, "parameter type from config.")
+		}
+	}
+	return "", false
+}