/*******************************************************************************
 * Copyright (c) 2000, 2016 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.ui.part;

import java.util.Arrays;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IPersistableElement;

/**
 * Implements an input for a <code>AbstractMultiEditor</code>.
 *
 * This class is intended to be instantiated by clients but is
 * not intended to be subclassed.
 * @noextend This class is not intended to be subclassed by clients.
 */
public class MultiEditorInput implements IEditorInput {

    IEditorInput input[];

    String editors[];

    /**
     * Constructs a new MultiEditorInput.
     */
    public MultiEditorInput(String[] editorIDs, IEditorInput[] innerEditors) {
        Assert.isNotNull(editorIDs);
        Assert.isNotNull(innerEditors);
        editors = editorIDs;
        input = innerEditors;
    }

    /**
     * Returns an array with the input of all inner editors.
     */
    public IEditorInput[] getInput() {
        return input;
    }

    /**
     * Retunrs an array with the id of all inner editors.
     */
    public String[] getEditors() {
        return editors;
    }

    /*
     * @see IEditorInput#exists()
     */
    @Override
	public boolean exists() {
        return true;
    }

    /*
     * @see IEditorInput#getImageDescriptor()
     */
    @Override
	public ImageDescriptor getImageDescriptor() {
        return null;
    }

    /*
     * @see IEditorInput#getName()
     */
    @Override
	public String getName() {
        String name = ""; //$NON-NLS-1$
        for (int i = 0; i < (input.length - 1); i++) {
            name = name + input[i].getName() + "/"; //$NON-NLS-1$
        }
        name = name + input[input.length - 1].getName();
        return name;
    }

    /*
     * @see IEditorInput#getPersistable()
     */
    @Override
	public IPersistableElement getPersistable() {
        return null;
    }

    /*
     * @see IEditorInput#getToolTipText()
     */
    @Override
	public String getToolTipText() {
        return getName();
    }

    /*
     * @see IAdaptable#getAdapter(Class)
     */
    @Override
	public <T> T getAdapter(Class<T> adapter) {
        return null;
    }


    @Override
	public boolean equals(Object obj) {
        if (this == obj) {
			return true;
		}
        if (!(obj instanceof MultiEditorInput)) {
			return false;
		}
        MultiEditorInput other = (MultiEditorInput) obj;
        return Arrays.equals(this.editors, other.editors) && Arrays.equals(this.input, other.input);
    }


    @Override
	public int hashCode() {
        int hash = 0;
        for (String editor : editors) {
            hash = hash * 37 + editor.hashCode();
        }
        for (IEditorInput editorInput : input) {
            hash = hash * 37 + editorInput.hashCode();
        }
        return hash;
    }
}