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/*******************************************************************************
* Copyright (c) 2001, 2004 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
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.sse.core.internal.util;
import java.io.BufferedInputStream;
import java.io.InputStream;
import org.eclipse.wst.sse.core.internal.encoding.CodedIO;
import org.eclipse.wst.sse.core.internal.encoding.util.BufferedLimitedStream;
public class Utilities {
/**
* a common calculation in some of the parsing methods (e.g. in
* ContextRegion and IStructuredDocumentRegion)
*/
public static int calculateLengthDifference(String changes, int lengthToReplace) {
// determine the length by the text itself, or, if there is no text to
// insert (i.e. we are doing a delete) then calculate the length as
// a negative number to denote the amount to delete.
// For a straight insert, the selection Length will be zero.
int lengthDifference = 0;
if (changes == null) {
// the delete case
lengthDifference = 0 - lengthToReplace;
}
else {
lengthDifference = changes.length() - lengthToReplace;
}
if (Debug.debugStructuredDocument) {
System.out.println("lengthDifference: " + lengthDifference);//$NON-NLS-1$
}
return lengthDifference;
}
/**
* Returns true iff both parameters are not null and the object is within
* the array. Careful, this uses identity. Not good for basic strings.
*/
public static boolean contains(Object[] objectArray, Object object) {
boolean result = false;
// if object or objectArray is null, return false
if ((objectArray != null) && (object != null)) {
for (int i = 0; i < objectArray.length; i++) {
if (objectArray[i] == object) {
result = true;
break;
}
}
}
return result;
}
public static boolean containsString(String[] objectArray, String object) {
boolean result = false;
// if object or objectArray is null, return false
if ((objectArray != null) && (object != null)) {
for (int i = 0; i < objectArray.length; i++) {
if (objectArray[i].equals(object)) {
result = true;
break;
}
}
}
return result;
}
/**
* Ensures that an InputStream has mark/reset support, is readlimit is
* set, and that the stream is "limitable" (that is, reports "end of
* input" rather than allow going past mark). This is very specialized
* stream introduced to overcome
* https://bugs.eclipse.org/bugs/show_bug.cgi?id=67211. See also
* https://bugs.eclipse.org/bugs/show_bug.cgi?id=68565
*/
public static InputStream getLimitedStream(InputStream original) {
if (original == null)
return null;
if (original instanceof BufferedLimitedStream)
return original;
return new BufferedLimitedStream(original, CodedIO.MAX_BUF_SIZE);
}
/**
* <p>
* Ensures that an InputStream has mark/reset support.
* </p>
* <p>
* It's vital that a BufferedInputStream <b>not</b> be wrapped in another
* BufferedInputStream as each can preemptively consume <i>n</i> bytes
* (e.g. 2048) from the parent stream before any requests are made. The
* cascading effect is that the second/inner BufferedInputStream can never
* rewind itself to the first <i>n</i> bytes since they were already
* consumed by its parent.
* </p>
*/
public static InputStream getMarkSupportedStream(InputStream original) {
if (original == null)
return null;
if (original.markSupported())
return original;
InputStream buffered = new BufferedInputStream(original, CodedIO.MAX_BUF_SIZE);
buffered.mark(CodedIO.MAX_MARK_SIZE);
return buffered;
}
/**
* Used for log/trace messages. Id is assumed to be some form of a
* filename. See IModelManager.
*/
public static String makeShortId(Object id) {
if (id == null)
id = "NOID";//$NON-NLS-1$
String whole = id.toString();
String part = whole.substring(whole.lastIndexOf("/") + 1); //$NON-NLS-1$
return "..." + part; //$NON-NLS-1$
}
/**
* Utilities constructor comment.
*/
public Utilities() {
super();
}
}
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