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/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.jface.text;

import org.eclipse.core.runtime.Assert;


/**
 * Specification of changes applied to documents. All changes are represented as
 * replace commands, i.e. specifying a document range whose text gets replaced
 * with different text. In addition to this information, the event also contains
 * the changed document.
 *
 * @see org.eclipse.jface.text.IDocument
 */
public class DocumentEvent {

	/**
	 * Debug option for asserting that text is not null.
	 * If the org.eclipse.text/debug/DocumentEvent/assertTextNotNull
	 * system property is true
	 *
	 * @since 3.3
	 */
	private static final boolean ASSERT_TEXT_NOT_NULL= Boolean.getBoolean("org.eclipse.text/debug/DocumentEvent/assertTextNotNull"); //$NON-NLS-1$

	/** The changed document */
	public IDocument fDocument;
	/** The document offset */
	public int fOffset;
	/** Length of the replaced document text */
	public int fLength;
	/** Text inserted into the document */
	public String fText= ""; //$NON-NLS-1$
	/**
	 * The modification stamp of the document when firing this event.
	 * @since 3.1 and public since 3.3
	 */
	public long fModificationStamp;

	/**
	 * Creates a new document event.
	 *
	 * @param doc the changed document
	 * @param offset the offset of the replaced text
	 * @param length the length of the replaced text
	 * @param text the substitution text
	 */
	public DocumentEvent(IDocument doc, int offset, int length, String text) {

		Assert.isNotNull(doc);
		Assert.isTrue(offset >= 0);
		Assert.isTrue(length >= 0);

		if (ASSERT_TEXT_NOT_NULL)
			Assert.isNotNull(text);

		fDocument= doc;
		fOffset= offset;
		fLength= length;
		fText= text;

		if (fDocument instanceof IDocumentExtension4)
			fModificationStamp= ((IDocumentExtension4)fDocument).getModificationStamp();
		else
			fModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP;
	}

	/**
	 * Creates a new, not initialized document event.
	 */
	public DocumentEvent() {
	}

	/**
	 * Returns the changed document.
	 *
	 * @return the changed document
	 */
	public IDocument getDocument() {
		return fDocument;
	}

	/**
	 * Returns the offset of the change.
	 *
	 * @return the offset of the change
	 */
	public int getOffset() {
		return fOffset;
	}

	/**
	 * Returns the length of the replaced text.
	 *
	 * @return the length of the replaced text
	 */
	public int getLength() {
		return fLength;
	}

	/**
	 * Returns the text that has been inserted.
	 *
	 * @return the text that has been inserted
	 */
	public String getText() {
		return fText;
	}

	/**
	 * Returns the document's modification stamp at the
	 * time when this event was sent.
	 *
	 * @return the modification stamp or {@link IDocumentExtension4#UNKNOWN_MODIFICATION_STAMP}.
	 * @see IDocumentExtension4#getModificationStamp()
	 * @since 3.1
	 */
	public long getModificationStamp() {
		return fModificationStamp;
	}

	@Override
	public String toString() {
		StringBuilder buffer= new StringBuilder();
		buffer.append("offset: " ); //$NON-NLS-1$
		buffer.append(fOffset);
		buffer.append(", length: " ); //$NON-NLS-1$
		buffer.append(fLength);
		buffer.append(", timestamp: " ); //$NON-NLS-1$
		buffer.append(fModificationStamp);
		buffer.append("\ntext:>" ); //$NON-NLS-1$
		buffer.append(fText);
		buffer.append("<\n" ); //$NON-NLS-1$
		return buffer.toString();
	}
}