001: /*******************************************************************************
002: * Copyright (c) 2000, 2006 IBM Corporation and others.
003: * All rights reserved. This program and the accompanying materials
004: * are made available under the terms of the Eclipse Public License v1.0
005: * which accompanies this distribution, and is available at
006: * http://www.eclipse.org/legal/epl-v10.html
007: *
008: * Contributors:
009: * IBM Corporation - initial API and implementation
010: *******************************************************************************/package org.eclipse.jdt.ui.actions;
011:
012: import java.util.Arrays;
013: import java.util.HashSet;
014: import java.util.Iterator;
015: import java.util.Set;
016:
017: import org.eclipse.jface.dialogs.MessageDialog;
018: import org.eclipse.jface.viewers.IStructuredSelection;
019:
020: import org.eclipse.jface.text.ITextSelection;
021:
022: import org.eclipse.ui.IWorkbenchSite;
023: import org.eclipse.ui.PlatformUI;
024:
025: import org.eclipse.jdt.core.IJavaElement;
026: import org.eclipse.jdt.core.IMember;
027: import org.eclipse.jdt.core.IType;
028: import org.eclipse.jdt.core.JavaModelException;
029:
030: import org.eclipse.jdt.internal.corext.refactoring.RefactoringAvailabilityTester;
031: import org.eclipse.jdt.internal.corext.refactoring.RefactoringExecutionStarter;
032: import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
033:
034: import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
035: import org.eclipse.jdt.internal.ui.JavaPlugin;
036: import org.eclipse.jdt.internal.ui.actions.ActionUtil;
037: import org.eclipse.jdt.internal.ui.actions.SelectionConverter;
038: import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
039: import org.eclipse.jdt.internal.ui.javaeditor.JavaTextSelection;
040: import org.eclipse.jdt.internal.ui.refactoring.RefactoringMessages;
041: import org.eclipse.jdt.internal.ui.util.ExceptionHandler;
042:
043: /**
044: * Action to push down methods and fields into subclasses.
045: * <p>
046: * Action is applicable to selections containing elements of type
047: * <code>IField</code> and <code>IMethod</code>.
048: *
049: * <p>
050: * This class may be instantiated; it is not intended to be subclassed.
051: * </p>
052: *
053: * @since 2.1
054: */
055: public class PushDownAction extends SelectionDispatchAction {
056:
057: private static IMember[] getSelectedMembers(
058: IStructuredSelection selection) {
059: if (selection.isEmpty())
060: return null;
061: if (selection.size() == 1) {
062: try {
063: final IType type = RefactoringAvailabilityTester
064: .getSingleSelectedType(selection);
065: if (type != null)
066: return new IType[] { type };
067: } catch (JavaModelException exception) {
068: JavaPlugin.log(exception);
069: }
070: }
071: for (Iterator iter = selection.iterator(); iter.hasNext();) {
072: if (!(iter.next() instanceof IMember))
073: return null;
074: }
075: Set memberSet = new HashSet();
076: memberSet.addAll(Arrays.asList(selection.toArray()));
077: return (IMember[]) memberSet.toArray(new IMember[memberSet
078: .size()]);
079: }
080:
081: private JavaEditor fEditor;
082:
083: /**
084: * Note: This constructor is for internal use only. Clients should not call
085: * this constructor.
086: *
087: * @param editor the java editor
088: */
089: public PushDownAction(JavaEditor editor) {
090: this (editor.getEditorSite());
091: fEditor = editor;
092: setEnabled(SelectionConverter.canOperateOn(fEditor));
093: }
094:
095: /**
096: * Creates a new <code>PushDownAction</code>. The action requires that
097: * the selection provided by the site's selection provider is of type <code>
098: * org.eclipse.jface.viewers.IStructuredSelection</code>.
099: *
100: * @param site
101: * the site providing context information for this action
102: */
103: public PushDownAction(IWorkbenchSite site) {
104: super (site);
105: setText(RefactoringMessages.PushDownAction_Push_Down);
106: PlatformUI.getWorkbench().getHelpSystem().setHelp(this ,
107: IJavaHelpContextIds.PUSH_DOWN_ACTION);
108: }
109:
110: private IMember getSelectedMemberFromEditor()
111: throws JavaModelException {
112: IJavaElement element = SelectionConverter
113: .resolveEnclosingElement(fEditor,
114: (ITextSelection) fEditor.getSelectionProvider()
115: .getSelection());
116: if (element == null || !(element instanceof IMember))
117: return null;
118: return (IMember) element;
119: }
120:
121: /**
122: * {@inheritDoc}
123: */
124: public void run(IStructuredSelection selection) {
125: try {
126: IMember[] members = getSelectedMembers(selection);
127: if (RefactoringAvailabilityTester
128: .isPushDownAvailable(members)
129: && ActionUtil.isEditable(getShell(), members[0]))
130: RefactoringExecutionStarter.startPushDownRefactoring(
131: members, getShell());
132: } catch (JavaModelException e) {
133: ExceptionHandler
134: .handle(
135: e,
136: RefactoringMessages.OpenRefactoringWizardAction_refactoring,
137: RefactoringMessages.OpenRefactoringWizardAction_exception);
138: }
139: }
140:
141: /**
142: * {@inheritDoc}
143: */
144: public void run(ITextSelection selection) {
145: try {
146: if (!ActionUtil.isEditable(fEditor))
147: return;
148: IMember member = getSelectedMemberFromEditor();
149: IMember[] array = new IMember[] { member };
150: if (member != null
151: && RefactoringAvailabilityTester
152: .isPushDownAvailable(array)) {
153: RefactoringExecutionStarter.startPushDownRefactoring(
154: array, getShell());
155: } else {
156: MessageDialog
157: .openInformation(
158: getShell(),
159: RefactoringMessages.OpenRefactoringWizardAction_unavailable,
160: RefactoringMessages.PushDownAction_To_activate);
161: }
162: } catch (JavaModelException e) {
163: ExceptionHandler
164: .handle(
165: e,
166: RefactoringMessages.OpenRefactoringWizardAction_refactoring,
167: RefactoringMessages.OpenRefactoringWizardAction_exception);
168: }
169: }
170:
171: /**
172: * {@inheritDoc}
173: */
174: public void selectionChanged(IStructuredSelection selection) {
175: try {
176: setEnabled(RefactoringAvailabilityTester
177: .isPushDownAvailable(selection));
178: } catch (JavaModelException e) {
179: // http://bugs.eclipse.org/bugs/show_bug.cgi?id=19253
180: if (JavaModelUtil.isExceptionToBeLogged(e))
181: JavaPlugin.log(e);
182: setEnabled(false);// no UI
183: }
184: }
185:
186: /**
187: * {@inheritDoc}
188: */
189: public void selectionChanged(ITextSelection selection) {
190: setEnabled(true);
191: }
192:
193: /**
194: * Note: This method is for internal use only. Clients should not call this
195: * method.
196: *
197: * @param selection
198: */
199: public void selectionChanged(JavaTextSelection selection) {
200: try {
201: setEnabled(RefactoringAvailabilityTester
202: .isPushDownAvailable(selection));
203: } catch (JavaModelException e) {
204: setEnabled(false);
205: }
206: }
207: }
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