com.google.test.metric.eclipse.ui.internal.JavaPackageElementContentProvider.java Source code

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Here is the source code for com.google.test.metric.eclipse.ui.internal.JavaPackageElementContentProvider.java

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/*
 * Copyright 2009 Google Inc.
 *
 * 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 com.google.test.metric.eclipse.ui.internal;

import com.google.test.metric.eclipse.internal.util.JavaProjectHelper;
import com.google.test.metric.eclipse.internal.util.Logger;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.IParent;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

import java.util.ArrayList;
import java.util.List;

/**
 * Provides the list of packages to be displayed in the whitelist selection dialog.
 * 
 * @author shyamseshadri@google.com (Shyam Seshadri)
 */
public class JavaPackageElementContentProvider implements ITreeContentProvider {

    private JavaProjectHelper javaProjectHelper;
    private final static Logger logger = new Logger();

    public JavaPackageElementContentProvider() {
        javaProjectHelper = new JavaProjectHelper();
    }

    public Object[] getChildren(Object element) {
        if (element instanceof IJavaProject) {
            try {
                return javaProjectHelper.getAllJavaPackageFragmentRoots((IJavaProject) element).toArray();
            } catch (JavaModelException e) {
                logger.logException(e);
            } catch (CoreException e) {
                logger.logException(e);
            }
        } else if (element instanceof IPackageFragmentRoot || element instanceof IPackageFragment) {
            try {
                List<IJavaElement> javaElements = new ArrayList<IJavaElement>();
                IJavaElement[] children = ((IParent) element).getChildren();
                for (IJavaElement javaElement : children) {
                    if (javaElement instanceof IPackageFragment && !javaElement.getElementName().equals("")) {
                        javaElements.add(javaElement);
                    }
                }
                return javaElements.toArray();
            } catch (JavaModelException e) {
                logger.logException(e);
            }
        }
        return null;
    }

    public Object getParent(Object element) {
        if (element instanceof IJavaElement) {
            return ((IJavaElement) element).getParent();
        }
        return null;
    }

    public boolean hasChildren(Object element) {
        // TODO(shyamseshadri): Figure out a better, faster, more optimum way to do this.
        return getChildren(element).length > 0;
    }

    public Object[] getElements(Object inputElement) {
        return getChildren(inputElement);
    }

    public void dispose() {
    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
    }
}