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/*******************************************************************************
* Copyright (c) 2000, 2006 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.core.runtime;
/**
* Qualified names are two-part names: qualifier and local name.
* The qualifier must be in URI form (see RFC2396).
* Note however that the qualifier may be <code>null</code> if
* the default name space is being used. The empty string is not
* a valid local name.
* <p>
* This class can be used without the OSGi bundle present.
* </p><p>
* This class is not intended to be subclassed by clients.
* </p>
*/
public final class QualifiedName {
/** Qualifier part (potentially <code>null</code>). */
/*package*/
String qualifier = null;
/** Local name part. */
/*package*/
String localName = null;
/**
* Creates and returns a new qualified name with the given qualifier
* and local name. The local name must not be the empty string.
* The qualifier may be <code>null</code>.
* <p>
* Clients may instantiate.
* </p>
* @param qualifier the qualifier string, or <code>null</code>
* @param localName the local name string
*/
public QualifiedName(String qualifier, String localName) {
Assert.isLegal(localName != null && localName.length() != 0);
this.qualifier = qualifier;
this.localName = localName;
}
/**
* Returns whether this qualified name is equivalent to the given object.
* <p>
* Qualified names are equal if and only if they have the same
* qualified parts and local parts.
* Qualified names are not equal to objects other than qualified names.
* </p>
*
* @param obj the object to compare to
* @return <code>true</code> if these are equivalent qualified
* names, and <code>false</code> otherwise
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof QualifiedName)) {
return false;
}
QualifiedName qName = (QualifiedName) obj;
/* There may or may not be a qualifier */
if (qualifier == null && qName.getQualifier() != null) {
return false;
}
if (qualifier != null && !qualifier.equals(qName.getQualifier())) {
return false;
}
return localName.equals(qName.getLocalName());
}
/**
* Returns the local part of this name.
*
* @return the local name string
*/
public String getLocalName() {
return localName;
}
/**
* Returns the qualifier part for this qualified name, or <code>null</code>
* if none.
*
* @return the qualifier string, or <code>null</code>
*/
public String getQualifier() {
return qualifier;
}
/* (Intentionally omitted from javadoc)
* Implements the method <code>Object.hashCode</code>.
*
* Returns the hash code for this qualified name.
*/
public int hashCode() {
return (qualifier == null ? 0 : qualifier.hashCode()) + localName.hashCode();
}
/**
* Converts this qualified name into a string, suitable for
* debug purposes only.
*/
public String toString() {
return (getQualifier() == null ? "" : getQualifier() + ':') + getLocalName(); //$NON-NLS-1$
}
}
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