ext.org.eclipse.jdt.internal.ui.callhierarchy.OpenCallHierarchyAction.java Source code

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Here is the source code for ext.org.eclipse.jdt.internal.ui.callhierarchy.OpenCallHierarchyAction.java

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/*******************************************************************************
 * Copyright (c) 2000, 2011 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:
 *   Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation
 *          (report 36180: Callers/Callees view)
 *******************************************************************************/
package ext.org.eclipse.jdt.internal.ui.callhierarchy;

import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.text.ITextSelection;

import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.PlatformUI;

import org.eclipse.jdt.core.IField;
import org.eclipse.jdt.core.IInitializer;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.ITypeRoot;
import org.eclipse.jdt.core.JavaModelException;
import patch.org.eclipse.jdt.ui.actions.SelectionDispatchAction;

import patch.org.eclipse.jdt.internal.ui.JavaPlugin;

import ext.org.eclipse.jdt.internal.corext.callhierarchy.CallHierarchy;
import ext.org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
import ext.org.eclipse.jdt.internal.ui.actions.ActionMessages;
import ext.org.eclipse.jdt.internal.ui.actions.ActionUtil;
import ext.org.eclipse.jdt.internal.ui.actions.SelectionConverter;
import ext.org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
import ext.org.eclipse.jdt.internal.ui.util.ExceptionHandler;

/**
 * This action opens a call hierarchy on the selected members.
 */
public class OpenCallHierarchyAction extends SelectionDispatchAction {

    private JavaEditor fEditor;

    /**
     * Creates a new <code>OpenCallHierarchyAction</code>. The action requires
     * that the selection provided by the site's selection provider is of type
     * <code>org.eclipse.jface.viewers.IStructuredSelection</code>.
     *
     * @param site the site providing context information for this action
     */
    public OpenCallHierarchyAction(IWorkbenchSite site) {
        super(site);
        setText(CallHierarchyMessages.OpenCallHierarchyAction_label);
        setToolTipText(CallHierarchyMessages.OpenCallHierarchyAction_tooltip);
        setDescription(CallHierarchyMessages.OpenCallHierarchyAction_description);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.CALL_HIERARCHY_OPEN_ACTION);
    }

    /**
     * Note: This constructor is for internal use only. Clients should not call this constructor.
     * @param editor internal
     */
    public OpenCallHierarchyAction(JavaEditor editor) {
        this(editor.getEditorSite());
        fEditor = editor;
        setEnabled(SelectionConverter.canOperateOn(fEditor));
    }

    /* (non-Javadoc)
     * Method declared on SelectionDispatchAction.
     */
    @Override
    public void selectionChanged(ITextSelection selection) {
        // Do nothing
    }

    /* (non-Javadoc)
     * Method declared on SelectionDispatchAction.
     */
    @Override
    public void selectionChanged(IStructuredSelection selection) {
        setEnabled(CallHierarchy.arePossibleInputElements(selection.toList()));
    }

    /* (non-Javadoc)
     * Method declared on SelectionDispatchAction.
     */
    @Override
    public void run(ITextSelection selection) {
        ITypeRoot input = SelectionConverter.getInput(fEditor);
        if (!ActionUtil.isProcessable(getShell(), input))
            return;

        try {
            IJavaElement[] elements = SelectionConverter.codeResolveOrInputForked(fEditor);
            if (elements == null)
                return;
            List<IJavaElement> candidates = new ArrayList<IJavaElement>(elements.length);
            for (int i = 0; i < elements.length; i++) {
                IJavaElement element = elements[i];
                if (CallHierarchy.isPossibleInputElement(element)) {
                    candidates.add(element);
                }
            }
            if (candidates.isEmpty()) {
                IJavaElement enclosingMethod = getEnclosingMethod(input, selection);
                if (enclosingMethod != null) {
                    candidates.add(enclosingMethod);
                }
            }
            CallHierarchyUI.openSelectionDialog(candidates.toArray(new IMember[candidates.size()]),
                    getSite().getWorkbenchWindow());

        } catch (InvocationTargetException e) {
            ExceptionHandler.handle(e, getShell(), CallHierarchyMessages.OpenCallHierarchyAction_dialog_title,
                    ActionMessages.SelectionConverter_codeResolve_failed);
        } catch (InterruptedException e) {
            // cancelled
        }
    }

    private IJavaElement getEnclosingMethod(ITypeRoot input, ITextSelection selection) {
        try {
            IJavaElement enclosingElement = input.getElementAt(selection.getOffset());
            if (enclosingElement instanceof IMethod || enclosingElement instanceof IInitializer
                    || enclosingElement instanceof IField) {
                // opening on the enclosing type would be too confusing (since the type resolves to the constructors)
                return enclosingElement;
            }
        } catch (JavaModelException e) {
            JavaPlugin.log(e);
        }

        return null;
    }

    /* (non-Javadoc)
     * Method declared on SelectionDispatchAction.
     */
    @Override
    public void run(IStructuredSelection selection) {
        List<?> elements = selection.toList();
        if (!CallHierarchy.arePossibleInputElements(elements)) {
            elements = Collections.EMPTY_LIST;
        }

        IMember[] members = elements.toArray(new IMember[elements.size()]);
        if (!ActionUtil.areProcessable(getShell(), members))
            return;

        CallHierarchyUI.openView(members, getSite().getWorkbenchWindow());
    }

}