Eclipse source code reading: gototypeaction

Go to type is a sub-menu function under the navigate menu of Eclipse, as shown below:

Most of the content is the same as {eclipse source code reading: Go to resource click open link.

Paste the core code of the analysis directly here, and add Chinese comments to the key part.

/*************************************** **************************************** * Copyright (c) 2000,200 8 IBM Corporation and Others. * All Rights Reserved. this program and the accompanying materials * are made available under the terms of the eclipse Public License V1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html ** contributors: * IBM Corporation-initial API and implementation ********************************** **************************************** * ***/package Org. eclipse. jdt. internal. UI. packageview; import Org. eclipse. SWT. widgets. shell; import Org. eclipse. jface. action. action; import Org. eclipse. jface. dialogs. idialogconstants; import Org. eclipse. jface. dialogs. messagedialog; import Org. eclipse. jface. dialogs. progressmonitordialo G; import Org. eclipse. jface. viewers. istructuredselection; import Org. eclipse. jface. viewers. structuredselection; import Org. eclipse. UI. platformui; import Org. eclipse. UI. dialogs. selectiondialog; import Org. eclipse. jdt. core. icompilationunit; import Org. eclipse. jdt. core. ijavaelement; import Org. eclipse. jdt. core. itype; import Org. eclipse. jdt. core. javamodelexception; import Org. eclipse. jdt. core. search. searchengi Ne; import Org. eclipse. jdt. internal. corext. util. messages; import Org. eclipse. jdt. UI. ijavaelementsearchconstants; import Org. eclipse. jdt. UI. javaelementlabels; import Org. eclipse. jdt. UI. javaui; import Org. eclipse. jdt. internal. UI. ijavahelpcontextids; import Org. eclipse. jdt. internal. UI. javaplugin; import Org. eclipse. jdt. internal. UI. util. exceptionhandler; Class gototypeaction extends action {private packageexp Lorerpart fpackageexplorer; gototypeaction (packagepolicerpart) {super (); settext (packagesmessages. gototype_action_label); setdescription (packagesmessages. gototype_action_description); fpackageexplorer = part; platformui. getworkbench (). gethelpsystem (). sethelp (this, ijavahelpcontextids. goto_type_action);} public void run () {shell = javaplugin. getactiveworkbenchshell (); selectiondialog dialog = NUL L; // in essence, the filteredtypesselectiondialog dialog box is constructed. For more information, see my other summary () Try {dialog = javaui. createtypedialog (shell, new progressmonitordialog (Shell), searchengine. createworkspaceconds (), ijavaelementsearchconstants. consider_all_types, false);} catch (javamodelexception e) {String title = getdialogtitle (); string message = packagesmessages. gototype_error_message; exceptionhandler. handle (E, title, message); return;} Dialog. Settitle (getdialogtitle (); dialog. setmessage (packagesmessages. gototype_dialog_message); If (dialog. open () = idialogconstants. cancel_id) {return;} object [] types = dipes. getresult (); If (types! = NULL & types. length> 0) {gototype (itype) types [0]); // only select the first element} private void gototype (itype type) {// type. getancestor obtains the icompilationunit Cu = (icompilationunit) Type of the ancestor of the specified type (INT value is defined in ijavaelement. getancestor (ijavaelement. compilation_unit); ijavaelement element = NULL; If (Cu! = NULL) {element = Cu. getprimary ();} else {element = type. getancestor (ijavaelement. class_file);} If (element! = NULL) {packagepolicerpart view = packagepolicerpart. openinactiveperspective (); If (view! = NULL) {// In the tree structure of package explorer, locate view. selectreveal (New structuredselection (element); If (! Element. equals (getselectedelement (View) {messagedialog. openinformation (fpackageexplorer. getsite (). getshell (), getdialogtitle (), messages. format (packagesmessages. packageexplorer_element_not_present, javaelementlabels. getelementlabel (element, javaelementlabels. all_default) ;}}} private object getselectedelement (packagecyclerpart view) {return (istructuredselection) view. getsite (). getselectionprovider (). getselection ()). getfirstelement ();} private string getdialogtitle () {return packagesmessages. gototype_dialog_title ;}}