thredds.catalog.InvMetadata Maven / Gradle / Ivy
/*
* Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package thredds.catalog;
/**
* A metadata element: structured XML element containing info about associated dataset or catalog.
*
* @author john caron
* @see InvMetadata for public interface
*/
public class InvMetadata {
private InvDataset dataset;
private String title, type;
private String xlinkHref;
private java.net.URI xlinkUri = null;
private String namespaceURI, prefix;
private boolean isInherited;
private boolean isThreddsMetadata = true;
private MetadataConverterIF converter = null;
private Object contentObject = null;
private ThreddsMetadata tm = null;
private StringBuilder log = new StringBuilder();
/**
* Constructor for elements with Xlinks.
*
* @param dataset : dataset that contains the metadata.
* @param xlinkHref : URI of xlink, may be null.
* @param title : xlink title, may be null.
* @param type : metadata type
* @param namespaceURI : namespace URI string of the element, use null for THREDDS
* @param prefix : namespace prefix of the element, use null for THREDDS
* @param inherited : if inherited
* @param isThreddsMetadata : is threddsMetadata
* @param converter : converter for creating the content object, may be null
*/
public InvMetadata(InvDataset dataset, String xlinkHref, String title, String type,
String namespaceURI, String prefix, boolean inherited, boolean isThreddsMetadata,
MetadataConverterIF converter) {
this.dataset = dataset;
this.xlinkHref = xlinkHref;
this.title = title;
this.type = type;
this.namespaceURI = namespaceURI;
this.prefix = prefix;
this.isInherited = inherited;
this.isThreddsMetadata = isThreddsMetadata;
this.converter = converter;
}
/**
* Constructor for elements with inline content.
*
* @param dataset : dataset that contains the metadata.
* @param mtype : metadata type
* @param namespaceURI : namespace URI string of the element, can use null for THREDDS
* @param namespacePrefix : namespace prefix of the element, use null for THREDDS
* @param inherited : if inherited
* @param isThreddsMetadata : is threddsMetadata
* @param converter : the metadata converter.
* @param contentObject : content object.
*/
public InvMetadata(InvDataset dataset, String mtype, String namespaceURI,
String namespacePrefix, boolean inherited, boolean isThreddsMetadata,
MetadataConverterIF converter, Object contentObject) {
this.dataset = dataset;
this.type = mtype;
this.namespaceURI = namespaceURI;
this.prefix = namespacePrefix;
this.isInherited = inherited;
this.isThreddsMetadata = isThreddsMetadata;
this.converter = converter;
this.contentObject = contentObject;
if (isThreddsMetadata)
tm = (ThreddsMetadata) contentObject;
init = true;
}
/**
* Constructor using an existing ThreddsMetadata object.
*
* @param dataset : dataset that contains the metadata.
* @param inherited : if inherited
* @param tm : content object.
*/
public InvMetadata(InvDataset dataset, boolean inherited, ThreddsMetadata tm) {
this.dataset = dataset;
this.isInherited = inherited;
this.isThreddsMetadata = true;
this.contentObject = tm;
this.tm = tm;
init = true;
}
/**
* Get the parent dataset of this InvMetadata
* @return the parent dataset of this InvMetadata
*/
public InvDataset getParentDataset() {
return this.dataset;
}
/**
* Get the converter; may be null.
* @return the converter or null
*/
public MetadataConverterIF getConverter() {
return converter;
}
/**
* Get the metadata type.
* @return the metadata type.
*/
public String getMetadataType() {
return type;
}
/**
* Get the namespace.
* @return the namespace.
*/
public String getNamespaceURI() {
return namespaceURI;
}
/**
* Get the prefix mapped to the namespace.
* @return the prefix mapped to the namespace.
*/
public String getNamespacePrefix() {
return prefix;
}
/**
* if it has an XLink
* @return true if it has an XLink
*/
public boolean hasXlink() {
return xlinkHref != null;
}
/**
* if its a XLink, get the xlink:href String
* @return the xlink:href or null
*/
public String getXlinkHref() {
return xlinkHref;
}
/**
* if its a XLink, get the xlink:href as an absolute URI; may be null
* @return the xlink:href as an absolute URI, or null
*/
public java.net.URI getXlinkURI() {
return xlinkUri;
}
/**
* if its a XLink, get the xlink:title attribute
* @return xlink:title or null
*/
public String getXlinkTitle() {
return title;
}
/**
* if it is inherited
* @return true if it is inherited
*/
public boolean isInherited() {
return isInherited;
}
/**
* if this element contains ThreddsMetadata
* @return true if this element contains ThreddsMetadata
*/
public boolean isThreddsMetadata() {
return isThreddsMetadata;
}
/**
* set if this element contains ThreddsMetadata
* @param isThreddsMetadata true if this element contains ThreddsMetadata
*/
public void setThreddsMetadata(boolean isThreddsMetadata) {
this.isThreddsMetadata = isThreddsMetadata;
}
/**
* set the namespace URI
* @param namespaceURI set the namespace URI
*/
public void setNamespaceURI(String namespaceURI) {
this.namespaceURI = namespaceURI;
hashCode = 0;
}
/**
* get the content object, may be null
* @return the content object, or null
*/
public Object getContentObject() {
finish();
return contentObject;
}
/**
* set the internal ThreddsMetadata; this holds elements from THREDDS namespace
* @param tmd the internal ThreddsMetadata object
*/
public void setThreddsMetadata(ThreddsMetadata tmd) {
tm = tmd;
}
/**
* get the internal ThreddsMetadata, if isThreddsMetadata() is true
* @return the internal ThreddsMetadata, or null
*/
public ThreddsMetadata getThreddsMetadata() {
return tm;
}
/**
* Finish getting the metadata if necessary.
* If this is an XLink, this will trigger a read of the href the first time called.
*/
public void finish() {
if (init) return;
init = true;
if (xlinkHref == null) return;
xlinkHref = xlinkHref.trim();
try {
this.xlinkUri = dataset.getParentCatalog().resolveUri(xlinkHref);
} catch (java.net.URISyntaxException e) {
log.append(" ** Error: Bad URL in metadata href = ").append(xlinkHref).append("\n");
return;
}
// open and read the referenced catalog XML
try {
if (converter == null) {
log.append(" **InvMetadata on = (").append(this).append("): has no converter\n");
return;
}
contentObject = converter.readMetadataContentFromURL(dataset, xlinkUri);
if (isThreddsMetadata)
tm = (ThreddsMetadata) contentObject;
} catch (java.io.IOException e) {
log.append(" **InvMetadata on = (").append(xlinkUri).append("): Exception (").append(e.getMessage()).append(")\n");
// e.printStackTrace();
}
}
private boolean init = false;
boolean check(StringBuilder out) {
boolean isValid = true;
if (log.length() > 0) {
isValid = false;
out.append(log);
}
if ((contentObject != null) && (converter != null))
isValid &= converter.validateMetadataContent(contentObject, out);
return isValid;
}
/**
* InvMetadata elements with same values are equal.
*/
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof InvMetadata)) return false;
return o.hashCode() == this.hashCode();
}
/**
* Override Object.hashCode() to implement equals.
*/
public int hashCode() {
if (hashCode == 0) {
int result = 17;
if (null != getNamespaceURI())
result = 37 * result + getNamespaceURI().hashCode();
if (null != getXlinkHref())
result = 37 * result + getXlinkHref().hashCode();
if (null != getXlinkTitle())
result = 37 * result + getXlinkTitle().hashCode();
if (null != getMetadataType())
result = 37 * result + getMetadataType().hashCode();
result = 37 * result + (isInherited() ? 1 : 0);
// if (isThreddsMetadata)
// result = 37*result + getThreddsMetadata().hashCode();
hashCode = result;
}
return hashCode;
}
private volatile int hashCode = 0; // Bloch, item 8
/** String representation
public String toString() {
return " xlink = "+getXlinkHref()+" mtype= "+type+" namespaceURI="+namespaceURI
+" isThredds= "+isThreddsMetadata +" inherit= "+isInherited();
} */
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