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/*******************************************************************************
* Copyright (c) 2001, 2005 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.wst.dtd.core.internal.saxparser;
public class ExternalID {
private static final int T_SYSTEM = 0;
private static final int T_PUBLIC = 1;
int type = T_PUBLIC;
String publicID = null;
String systemID = null;
/**
* Constructor for system IDs.
*
* @param systemID
* URI, which may be used to retrieve an external entity's
* content.
*/
public ExternalID(String systemID) {
this.type = T_SYSTEM;
this.publicID = null;
this.systemID = systemID;
}
/**
* Constructor for public and system IDs.
*
* @param publicID
* Identifier to be used to try to generate an alternative URI
* in order to retrieve the external entity's content, or
* <var>null</var> if a system identitier is to be
* constructed.
* @param systemID
* URI, which may be used to retrieve an external entity's
* content.
*/
public ExternalID(String publicID, String systemID) {
this.type = T_PUBLIC;
this.publicID = publicID;
this.systemID = systemID;
if (null == this.publicID)
this.type = T_SYSTEM;
}
/**
* Returns if this external ID is a system ID (or public ID).
*
* @return System ID=true, Public ID=false.
* @see #isPublic
*/
public boolean isSystem() {
return this.type == T_SYSTEM;
}
/**
* Returns if this external ID is a public ID (or system ID).
*
* @return Public ID=true, System ID=false.
* @see #isSystem
*/
public boolean isPublic() {
return this.type == T_PUBLIC;
}
/**
* Returns the system identifier of this external ID. A system identifier
* is a URI, which may be used to retrieve an external entity's content.
*
* @return The system identifier, or <var>null</var> if the identifier is
* not defined.
* @see #getPubidLiteral
*/
public String getSystemLiteral() {
return this.systemID;
}
/**
* Returns the public identifier of this external ID. This value is only
* valid if the identifier is defined as <var>public</var> (as opposed to
* <var>system</var>). Public identifiers may be used to try to generate
* an alternative URI in order to retrieve an external entity's content.
* If retrieval fails using the public identifier, an attempt must be made
* to retrieve content using the system identifier.
*
* @return The public identifier, or <var>null</var> if the identifier is
* not defined.
* @see #getSystemLiteral
*/
public String getPubIdLiteral() {
return this.publicID;
}
/**
* Returns this external ID in the format it was declared: <CODE>SYSTEM
* "<VAR>systemID</VAR>"</CODE> or <CODE>PUBLIC "<VAR>publicID</VAR>"
* "<VAR>systemID</VAR>"</CODE>.
*
* @return XML string representing the content of the external ID (never
* <var>null</var>).
*/
public String toString() {
String ret;
if (isSystem()) {
ret = "SYSTEM \"" + getSystemLiteral() + "\""; //$NON-NLS-1$ //$NON-NLS-2$
}
else if (null != getSystemLiteral()) {
ret = "PUBLIC \"" + getPubIdLiteral() + "\" \"" + getSystemLiteral() + "\""; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
else {
ret = "PUBLIC \"" + getPubIdLiteral() + "\""; // for NOTATION //$NON-NLS-1$ //$NON-NLS-2$
}
return ret;
}
/**
*
*/
public boolean equals(Object obj) {
if (obj == null)
return false;
if (!(obj instanceof ExternalID))
return false;
ExternalID eid = (ExternalID) obj;
if (!((eid.publicID == null && this.publicID == null) || eid.publicID != null && eid.publicID.equals(this.publicID)))
return false;
if (!((eid.systemID == null && this.systemID == null) || eid.systemID != null && eid.systemID.equals(this.systemID)))
return false;
return true;
}
/**
*
*/
public int hashCode() {
int retval = 0;
if (publicID != null)
retval = publicID.hashCode();
if (systemID != null)
retval += systemID.hashCode();
return retval;
}
}
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