org.springframework.ide.eclipse.ui.dialogs.WrappingStructuredSelection.java Source code

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Here is the source code for org.springframework.ide.eclipse.ui.dialogs.WrappingStructuredSelection.java

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/*******************************************************************************
 * Copyright (c) 2007 Spring IDE Developers
 * 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:
 *     Spring IDE Developers - initial API and implementation
 *******************************************************************************/
package org.springframework.ide.eclipse.ui.dialogs;

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

import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;

/**
 * This {@link IStructuredSelection} implementation fixes WTP problem in class
 * <code>StructuredTextSelection</code> that prevents from reentrant calls to
 * {@link StructuredSelection#getFirstElement()}.
 * <p>
 * Subsequent calls on the WTP class return <code>null</code>.
 * @author Christian Dupuis
 * @since 2.0
 */
public class WrappingStructuredSelection implements IStructuredSelection {

    private final IStructuredSelection wrapped;

    private Object selectedObject;

    public WrappingStructuredSelection(IStructuredSelection wrapped) {
        this.wrapped = wrapped;
    }

    public Object getFirstElement() {
        if (this.selectedObject == null) {
            this.selectedObject = wrapped.getFirstElement();
        }
        return this.selectedObject;
    }

    public boolean isEmpty() {
        return getFirstElement() == null;
    }

    public Iterator iterator() {
        return toList().iterator();
    }

    public int size() {
        return toList().size();
    }

    public Object[] toArray() {
        return toList().toArray();
    }

    public List<Object> toList() {
        List<Object> list = new ArrayList<Object>();
        list.add(getFirstElement());
        return list;
    }

}