ucar.nc2.Attribute Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of netcdf Show documentation
Show all versions of netcdf Show documentation
The NetCDF-Java Library is a Java interface to NetCDF files,
as well as to many other types of scientific data formats.
/*
* 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 ucar.nc2;
import ucar.ma2.*;
import java.util.List;
import java.nio.ByteBuffer;
import net.jcip.annotations.Immutable;
/**
* An Attribute has a name and a value, used for associating arbitrary metadata with a Variable or a Group.
* The value can be a one dimensional array of Strings or numeric values.
*
* Attributes are immutable.
*
* @author caron
*/
@Immutable
public class Attribute {
private final String name;
private String svalue; // optimization for common case of String valued attribute
private DataType dataType;
private int nelems; // can be 0 or greater
private Array values;
/**
* Get the name of this Attribute.
* Attribute names are unique within a NetcdfFile's global set, and within a Variable's set.
*
* @return name
*/
public String getName() {
return name;
}
/**
* Get the data type of the Attribute value.
*
* @return DataType
*/
public DataType getDataType() {
return dataType;
}
/**
* True if value is a String or String[].
*
* @return if its a String.
*/
public boolean isString() {
return dataType == DataType.STRING;
}
/**
* True if value is an array (getLength() > 1)
*
* @return if its an array.
*/
public boolean isArray() {
return (getLength() > 1);
}
/**
* Get the length of the array of values
*
* @return number of elementss in the array.
*/
public int getLength() {
return nelems;
}
/**
* Find whether the underlying data should be interpreted as unsigned.
* Only affects byte, short, and int.
*
* @return true if the data is unsigned integer type.
*/
public boolean isUnsigned() {
return (values != null) && values.isUnsigned();
}
/**
* Get the value as an Array.
*
* @return Array of values.
*/
public Array getValues() {
if (values == null && svalue != null) {
values = Array.factory(String.class, new int[]{1});
values.setObject(values.getIndex(), svalue);
}
return values;
}
/**
* Get the value as an Object.
* @param index which index
* @return ith value as an Object.
*/
public Object getValue(int index) {
if (isString()) return getStringValue(index);
return getNumericValue(index);
}
/**
* Retrieve String value; only call if isString() is true.
*
* @return String if this is a String valued attribute, else null.
* @see Attribute#isString
*/
public String getStringValue() {
return (svalue != null) ? svalue : getStringValue(0);
}
/**
* Retrieve ith String value; only call if isString() is true.
*
* @param index which index
* @return ith String value (if this is a String valued attribute and index in range), else null.
* @see Attribute#isString
*/
public String getStringValue(int index) {
if (!isString() || (index < 0) || (index >= nelems))
return null;
if ((svalue != null) && (index == 0)) return svalue;
return (String) values.getObject(index);
}
/**
* Retrieve numeric value.
* Equivalent to getNumericValue(0)
*
* @return the first element of the value array, or null if its a String.
*/
public Number getNumericValue() {
return getNumericValue(0);
}
/// these deal with array-valued attributes
/**
* Retrieve a numeric value by index. If its a String, it will try to parse it as a double.
*
* @param index the index into the value array.
* @return Number value[index], or null if its a non-parsable String or
* the index is out of range.
*/
public Number getNumericValue(int index) {
if (isString() || (index < 0) || (index >= nelems))
return null;
if (dataType == DataType.STRING) {
try {
return new Double(getStringValue(index));
}
catch (NumberFormatException e) {
return null;
}
}
// LOOK can attributes be enum valued? for now, no
if (dataType == DataType.BYTE)
return values.getByte(index);
else if (dataType == DataType.SHORT)
return values.getShort(index);
else if (dataType == DataType.INT)
return values.getInt(index);
else if (dataType == DataType.FLOAT)
return values.getFloat(index);
else if (dataType == DataType.DOUBLE)
return values.getDouble(index);
else if (dataType == DataType.LONG)
return values.getLong(index);
return null;
}
/**
* Instances which have same content are equal.
*/
@Override
public boolean equals(Object o) {
if (this == o) return true;
if ((o == null) || !(o instanceof Attribute)) return false;
final Attribute att = (Attribute) o;
if (!name.equals(att.name)) return false;
if (nelems != att.nelems) return false;
if (!dataType.equals(att.dataType)) return false;
if (svalue != null) return svalue.equals(att.getStringValue());
if (values != null) {
for (int i = 0; i < getLength(); i++) {
int r1 = isString() ? getStringValue(i).hashCode() : getNumericValue(i).hashCode();
int r2 = att.isString() ? att.getStringValue(i).hashCode() : att.getNumericValue(i).hashCode();
if (r1 != r2) return false;
}
}
return true;
}
/**
* Override Object.hashCode() to implement equals.
*/
@Override
public int hashCode() {
if (hashCode == 0) {
int result = 17;
result = 37 * result + getName().hashCode();
result = 37 * result + nelems;
result = 37 * result + getDataType().hashCode();
if (svalue != null)
result = 37 * result + svalue.hashCode();
else if (values != null) {
for (int i = 0; i < getLength(); i++) {
int h = isString() ? getStringValue(i).hashCode() : getNumericValue(i).hashCode();
result = 37 * result + h;
}
}
hashCode = result;
}
return hashCode;
}
private int hashCode = 0;
/**
* CDL representation, not strict
* @return CDL representation
*/
@Override
public String toString() {
return toString(false);
}
/**
* CDL representation
* @param strict if true, create strict CDL, escaping names
* @return CDL representation
*/
public String toString(boolean strict) {
StringBuilder buff = new StringBuilder();
buff.append( strict ? NetcdfFile.escapeName(getName()) : getName());
if (isString()) {
buff.append(" = ");
for (int i = 0; i < getLength(); i++) {
if (i != 0) buff.append(", ");
String val = getStringValue(i);
if (val != null)
buff.append("\"").append( NCdumpW.encodeString(val) ).append("\"");
}
} else {
buff.append(" = ");
for (int i = 0; i < getLength(); i++) {
if (i != 0) buff.append(", ");
buff.append(getNumericValue(i));
if (dataType == DataType.FLOAT)
buff.append("f");
else if (dataType == DataType.SHORT) {
if (isUnsigned()) buff.append("US"); else buff.append("S");
} else if (dataType == DataType.BYTE) {
if (isUnsigned()) buff.append("UB"); else buff.append("B");
} else if (dataType == DataType.LONG) {
if (isUnsigned()) buff.append("UL"); else buff.append("L");
} else if (dataType == DataType.INT) {
if (isUnsigned()) buff.append("U");
}
}
}
return buff.toString();
}
///////////////////////////////////////////////////////////////////////////////
/**
* Copy constructor
*
* @param name name of Attribute
* @param from copy value from here.
*/
public Attribute(String name, Attribute from) {
this.name = name;
this.dataType = from.dataType;
this.nelems = from.nelems;
this.svalue = from.svalue;
this.values = from.values;
}
/**
* Create a String-valued Attribute.
*
* @param name name of Attribute
* @param val value of Attribute
*/
public Attribute(String name, String val) {
this.name = name;
setStringValue(val);
}
/**
* Create a scalar numeric-valued Attribute.
*
* @param name name of Attribute
* @param val value of Attribute
*/
public Attribute(String name, Number val) {
this.name = name;
int[] shape = new int[1];
shape[0] = 1;
DataType dt = DataType.getType(val.getClass());
Array vala = Array.factory(dt.getPrimitiveClassType(), shape);
Index ima = vala.getIndex();
vala.setDouble(ima.set0(0), val.doubleValue());
setValues(vala);
}
/**
* Construct attribute with Array of values.
*
* @param name name of attribute
* @param values array of values.
*/
public Attribute(String name, Array values) {
this.name = name;
setValues(values);
}
/**
* Construct an empty attribute with no values
*
* @param name name of attribute
* @param dataType type of Attribute.
*/
public Attribute(String name, DataType dataType) {
this.name = name;
this.dataType = dataType == DataType.CHAR ? DataType.STRING : dataType;
this.nelems = 0;
}
/**
* Construct attribute with list of String or Number values.
*
* @param name name of attribute
* @param values list of values. must be String or Number, must all be the same type, and have at least 1 member
*/
public Attribute(String name, List values) {
this.name = name;
int n = values.size();
Object pa = null;
Class c = values.get(0).getClass();
if (c == String.class) {
String[] va = new String[n]; pa = va;
for (int i=0; i 0) && (val.charAt(len - 1) == 0))
len--;
if (len != val.length())
val = val.substring(0, len);
this.svalue = val;
this.nelems = 1;
this.dataType = DataType.STRING;
//values = Array.factory(String.class, new int[]{1});
//values.setObject(values.getIndex(), val);
//setValues(values);
}
/**
* set the values from an Array
*
* @param arr value of Attribute
*/
protected void setValues(Array arr) {
if (DataType.getType(arr.getElementType()) == null)
throw new IllegalArgumentException("Cant set Attribute with type " + arr.getElementType());
if (arr.getElementType() == char.class) { // turn CHAR into STRING
ArrayChar carr = (ArrayChar) arr;
if (carr.getRank() == 1) { // common case
svalue = carr.getString();
this.nelems = 1;
this.dataType = DataType.STRING;
return;
}
// otherwise its an array of Strings
arr = carr.make1DStringArray();
}
// this should be a utility somewhere
if (arr.getElementType() == ByteBuffer.class) { // turn OPAQUE into BYTE
int totalLen = 0;
arr.resetLocalIterator();
while (arr.hasNext()) {
ByteBuffer bb = (ByteBuffer) arr.next();
totalLen += bb.limit();
}
byte[] ba = new byte[totalLen];
int pos = 0;
arr.resetLocalIterator();
while (arr.hasNext()) {
ByteBuffer bb = (ByteBuffer) arr.next();
System.arraycopy(bb.array(), 0, ba, pos, bb.limit());
pos += bb.limit();
}
arr = Array.factory(DataType.BYTE, new int[] {totalLen}, ba);
}
if (arr.getRank() > 1)
arr = arr.reshape(new int[]{(int) arr.getSize()}); // make sure 1D
this.values = arr;
this.nelems = (int) arr.getSize();
this.dataType = DataType.getType( arr.getElementType());
hashCode = 0;
}
}