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/*******************************************************************************
* Copyright (c) 2005, 2008 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.core.utility;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;
/**
* A text range defines the offset into, length of, and line of a piece
* of text.
*
* Provisional API: This interface is part of an interim API that is still
* under development and expected to change significantly before reaching
* stability. It is available at this early stage to solicit feedback from
* pioneering adopters on the understanding that any code that uses this API
* will almost certainly be broken (repeatedly) as the API evolves.
*
* This interface is not intended to be implemented by clients.
*/
public interface TextRange {
/**
* Returns the offset of the text.
*
* @return the offset of the text
*/
int getOffset();
/**
* Return the length of the text.
*/
int getLength();
/**
* Return whether the range includes the character at the specified index.
*/
boolean includes(int index);
/**
* Return whether the range touches an insertion cursor at the
* specified index.
*/
boolean touches(int index);
/**
* Return the line number of the text.
*/
int getLineNumber();
/**
* Return true if the offsets and lengths are the same.
*/
boolean equals(Object obj);
/**
* Return a hash code that corresponds to the #equals() contract.
*/
int hashCode();
/**
* Empty implementation of text range.
*/
final class Empty implements TextRange {
public static final TextRange INSTANCE = new Empty();
public static TextRange instance() {
return INSTANCE;
}
// ensure single instance
private Empty() {
super();
}
public int getLineNumber() {
return IMessage.LINENO_UNSET;
}
public int getOffset() {
return IMessage.OFFSET_UNSET;
}
public int getLength() {
return IMessage.OFFSET_UNSET;
}
public boolean includes(int index) {
return false;
}
public boolean touches(int index) {
return index == 0; // ???
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if ( ! (o instanceof TextRange)) {
return false;
}
TextRange r = (TextRange) o;
return (r.getOffset() == 0)
&& (r.getLength() == 0);
}
@Override
public int hashCode() {
return 0;
}
@Override
public String toString() {
return "TextRange.Empty"; //$NON-NLS-1$
}
}
}
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