Rename common to android

Rename the "common" package to "android", because common is too
generic.  Also removes all android.Android naming stutter.

Ran:
gomvpkg -from 'android/soong/common' -to 'android/soong/android'
gorename -from '"android/soong/android".AndroidModuleContext' -to 'ModuleContext'
gorename -from '"android/soong/android".AndroidBaseContext' -to 'BaseContext'
gorename -from '"android/soong/android".AndroidModuleBase' -to 'ModuleBase'
gorename -from '"android/soong/android".AndroidBottomUpMutatorContext' -to 'BottomUpMutatorContext'
gorename -from '"android/soong/android".AndroidTopDownMutatorContext' -to 'TopDownMutatorContext'
gorename -from '"android/soong/android".AndroidModule' -to 'Module'

Change-Id: I3b23590b8ce7c8a1ea1139411d84a53163288da7

android/package_ctx.go

@@ -0,0 +1,133 @@
+// Copyright 2015 Google Inc. 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 android
+
+import (
+	"fmt"
+
+	"github.com/google/blueprint"
+)
+
+// AndroidPackageContext is a wrapper for blueprint.PackageContext that adds
+// some android-specific helper functions.
+type AndroidPackageContext struct {
+	blueprint.PackageContext
+}
+
+func NewPackageContext(pkgPath string) AndroidPackageContext {
+	return AndroidPackageContext{blueprint.NewPackageContext(pkgPath)}
+}
+
+// configErrorWrapper can be used with Path functions when a Context is not
+// available. A Config can be provided, and errors are stored as a list for
+// later retrieval.
+//
+// The most common use here will be with VariableFunc, where only a config is
+// provided, and an error should be returned.
+type configErrorWrapper struct {
+	pctx   AndroidPackageContext
+	config Config
+	errors []error
+}
+
+var _ PathContext = &configErrorWrapper{}
+var _ errorfContext = &configErrorWrapper{}
+
+func (e *configErrorWrapper) Config() interface{} {
+	return e.config
+}
+func (e *configErrorWrapper) Errorf(format string, args ...interface{}) {
+	e.errors = append(e.errors, fmt.Errorf(format, args...))
+}
+func (e *configErrorWrapper) AddNinjaFileDeps(deps ...string) {
+	e.pctx.AddNinjaFileDeps(deps...)
+}
+
+// SourcePathVariable returns a Variable whose value is the source directory
+// appended with the supplied path. It may only be called during a Go package's
+// initialization - either from the init() function or as part of a
+// package-scoped variable's initialization.
+func (p AndroidPackageContext) SourcePathVariable(name, path string) blueprint.Variable {
+	return p.VariableFunc(name, func(config interface{}) (string, error) {
+		ctx := &configErrorWrapper{p, config.(Config), []error{}}
+		p := safePathForSource(ctx, path)
+		if len(ctx.errors) > 0 {
+			return "", ctx.errors[0]
+		}
+		return p.String(), nil
+	})
+}
+
+// HostBinVariable returns a Variable whose value is the path to a host tool
+// in the bin directory for host targets. It may only be called during a Go
+// package's initialization - either from the init() function or as part of a
+// package-scoped variable's initialization.
+func (p AndroidPackageContext) HostBinToolVariable(name, path string) blueprint.Variable {
+	return p.VariableFunc(name, func(config interface{}) (string, error) {
+		ctx := &configErrorWrapper{p, config.(Config), []error{}}
+		p := PathForOutput(ctx, "host", ctx.config.PrebuiltOS(), "bin", path)
+		if len(ctx.errors) > 0 {
+			return "", ctx.errors[0]
+		}
+		return p.String(), nil
+	})
+}
+
+// HostJavaToolVariable returns a Variable whose value is the path to a host
+// tool in the frameworks directory for host targets. It may only be called
+// during a Go package's initialization - either from the init() function or as
+// part of a package-scoped variable's initialization.
+func (p AndroidPackageContext) HostJavaToolVariable(name, path string) blueprint.Variable {
+	return p.VariableFunc(name, func(config interface{}) (string, error) {
+		ctx := &configErrorWrapper{p, config.(Config), []error{}}
+		p := PathForOutput(ctx, "host", ctx.config.PrebuiltOS(), "framework", path)
+		if len(ctx.errors) > 0 {
+			return "", ctx.errors[0]
+		}
+		return p.String(), nil
+	})
+}
+
+// IntermediatesPathVariable returns a Variable whose value is the intermediate
+// directory appended with the supplied path. It may only be called during a Go
+// package's initialization - either from the init() function or as part of a
+// package-scoped variable's initialization.
+func (p AndroidPackageContext) IntermediatesPathVariable(name, path string) blueprint.Variable {
+	return p.VariableFunc(name, func(config interface{}) (string, error) {
+		ctx := &configErrorWrapper{p, config.(Config), []error{}}
+		p := PathForIntermediates(ctx, path)
+		if len(ctx.errors) > 0 {
+			return "", ctx.errors[0]
+		}
+		return p.String(), nil
+	})
+}
+
+// PrefixedPathsForOptionalSourceVariable returns a Variable whose value is the
+// list of present source paths prefixed with the supplied prefix. It may only
+// be called during a Go package's initialization - either from the init()
+// function or as part of a package-scoped variable's initialization.
+func (p AndroidPackageContext) PrefixedPathsForOptionalSourceVariable(
+	name, prefix string, paths []string) blueprint.Variable {
+
+	return p.VariableFunc(name, func(config interface{}) (string, error) {
+		ctx := &configErrorWrapper{p, config.(Config), []error{}}
+		paths := PathsForOptionalSource(ctx, "", paths)
+		if len(ctx.errors) > 0 {
+			return "", ctx.errors[0]
+		}
+		return JoinWithPrefix(paths.Strings(), prefix), nil
+	})
+}