org.apache.poi.hpsf.CustomProperties Maven / Gradle / Ivy
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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
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http://www.apache.org/licenses/LICENSE-2.0
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See the License for the specific language governing permissions and
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package org.apache.poi.hpsf;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.poi.hpsf.wellknown.PropertyIDMap;
/**
* Maintains the instances of {@link CustomProperty} that belong to a
* {@link DocumentSummaryInformation}. The class maintains the names of the
* custom properties in a dictionary. It implements the {@link Map} interface
* and by this provides a simplified view on custom properties: A property's
* name is the key that maps to a typed value. This implementation hides
* property IDs from the developer and regards the property names as keys to
* typed values.
*
* While this class provides a simple API to custom properties, it ignores
* the fact that not names, but IDs are the real keys to properties. Under the
* hood this class maintains a 1:1 relationship between IDs and names. Therefore
* you should not use this class to process property sets with several IDs
* mapping to the same name or with properties without a name: the result will
* contain only a subset of the original properties. If you really need to deal
* such property sets, use HPSF's low-level access methods.
*
* An application can call the {@link #isPure} method to check whether a
* property set parsed by {@link CustomProperties} is still pure (i.e.
* unmodified) or whether one or more properties have been dropped.
*
* This class is not thread-safe; concurrent access to instances of this
* class must be synchronized.
*
* While this class is roughly HashMap, that's the
* internal representation. To external calls, it should appear as
* HashMap mapping between Names and Custom Property Values.
*
* @author Rainer Klute <[email protected]>
*/
@SuppressWarnings("serial")
public class CustomProperties extends HashMap
{
/**
* Maps property IDs to property names.
*/
private Map dictionaryIDToName = new HashMap();
/**
* Maps property names to property IDs.
*/
private Map dictionaryNameToID = new HashMap();
/**
* Tells whether this object is pure or not.
*/
private boolean isPure = true;
/**
* Puts a {@link CustomProperty} into this map. It is assumed that the
* {@link CustomProperty} already has a valid ID. Otherwise use
* {@link #put(CustomProperty)}.
*/
public CustomProperty put(final String name, final CustomProperty cp)
{
if (name == null)
{
/* Ignoring a property without a name. */
isPure = false;
return null;
}
if (!(name.equals(cp.getName())))
throw new IllegalArgumentException("Parameter \"name\" (" + name +
") and custom property's name (" + cp.getName() +
") do not match.");
/* Register name and ID in the dictionary. Mapping in both directions is possible. If there is already a */
final Long idKey = Long.valueOf(cp.getID());
final Long oldID = dictionaryNameToID.get(name);
dictionaryIDToName.remove(oldID);
dictionaryNameToID.put(name, idKey);
dictionaryIDToName.put(idKey, name);
/* Put the custom property into this map. */
final CustomProperty oldCp = super.remove(oldID);
super.put(idKey, cp);
return oldCp;
}
/**
* Puts a {@link CustomProperty} that has not yet a valid ID into this
* map. The method will allocate a suitable ID for the custom property:
*
*
*
* If there is already a property with the same name, take the ID
* of that property.
Otherwise find the highest ID and use its value plus one.
*
* @param customProperty
* @return If the was already a property with the same name, the
* @throws ClassCastException
*/
private Object put(final CustomProperty customProperty) throws ClassCastException
{
final String name = customProperty.getName();
/* Check whether a property with this name is in the map already. */
final Long oldId = (Long) dictionaryNameToID.get(name);
if (oldId != null)
customProperty.setID(oldId.longValue());
else
{
long max = 1;
for (final Iterator i = dictionaryIDToName.keySet().iterator(); i.hasNext();)
{
final long id = i.next().longValue();
if (id > max)
max = id;
}
customProperty.setID(max + 1);
}
return this.put(name, customProperty);
}
/**
* Removes a custom property.
* @param name The name of the custom property to remove
* @return The removed property or null if the specified property was not found.
*
* @see java.util.HashSet#remove(java.lang.Object)
*/
public Object remove(final String name)
{
final Long id = (Long) dictionaryNameToID.get(name);
if (id == null)
return null;
dictionaryIDToName.remove(id);
dictionaryNameToID.remove(name);
return super.remove(id);
}
/**
* Adds a named string property.
*
* @param name The property's name.
* @param value The property's value.
* @return the property that was stored under the specified name before, or
* null if there was no such property before.
*/
public Object put(final String name, final String value)
{
final MutableProperty p = new MutableProperty();
p.setID(-1);
p.setType(Variant.VT_LPWSTR);
p.setValue(value);
final CustomProperty cp = new CustomProperty(p, name);
return put(cp);
}
/**
* Adds a named long property.
*
* @param name The property's name.
* @param value The property's value.
* @return the property that was stored under the specified name before, or
* null if there was no such property before.
*/
public Object put(final String name, final Long value)
{
final MutableProperty p = new MutableProperty();
p.setID(-1);
p.setType(Variant.VT_I8);
p.setValue(value);
final CustomProperty cp = new CustomProperty(p, name);
return put(cp);
}
/**
* Adds a named double property.
*
* @param name The property's name.
* @param value The property's value.
* @return the property that was stored under the specified name before, or
* null if there was no such property before.
*/
public Object put(final String name, final Double value)
{
final MutableProperty p = new MutableProperty();
p.setID(-1);
p.setType(Variant.VT_R8);
p.setValue(value);
final CustomProperty cp = new CustomProperty(p, name);
return put(cp);
}
/**
* Adds a named integer property.
*
* @param name The property's name.
* @param value The property's value.
* @return the property that was stored under the specified name before, or
* null if there was no such property before.
*/
public Object put(final String name, final Integer value)
{
final MutableProperty p = new MutableProperty();
p.setID(-1);
p.setType(Variant.VT_I4);
p.setValue(value);
final CustomProperty cp = new CustomProperty(p, name);
return put(cp);
}
/**
* Adds a named boolean property.
*
* @param name The property's name.
* @param value The property's value.
* @return the property that was stored under the specified name before, or
* null if there was no such property before.
*/
public Object put(final String name, final Boolean value)
{
final MutableProperty p = new MutableProperty();
p.setID(-1);
p.setType(Variant.VT_BOOL);
p.setValue(value);
final CustomProperty cp = new CustomProperty(p, name);
return put(cp);
}
/**
* Gets a named value from the custom properties.
*
* @param name the name of the value to get
* @return the value or null if a value with the specified
* name is not found in the custom properties.
*/
public Object get(final String name)
{
final Long id = (Long) dictionaryNameToID.get(name);
final CustomProperty cp = (CustomProperty) super.get(id);
return cp != null ? cp.getValue() : null;
}
/**
* Adds a named date property.
*
* @param name The property's name.
* @param value The property's value.
* @return the property that was stored under the specified name before, or
* null if there was no such property before.
*/
public Object put(final String name, final Date value)
{
final MutableProperty p = new MutableProperty();
p.setID(-1);
p.setType(Variant.VT_FILETIME);
p.setValue(value);
final CustomProperty cp = new CustomProperty(p, name);
return put(cp);
}
/**
* Returns a set of all the names of our
* custom properties. Equivalent to
* {@link #nameSet()}
*/
public Set keySet() {
return dictionaryNameToID.keySet();
}
/**
* Returns a set of all the names of our
* custom properties
*/
public Set nameSet() {
return dictionaryNameToID.keySet();
}
/**
* Returns a set of all the IDs of our
* custom properties
*/
public Set idSet() {
return dictionaryNameToID.keySet();
}
/**
* Sets the codepage.
*
* @param codepage the codepage
*/
public void setCodepage(final int codepage)
{
final MutableProperty p = new MutableProperty();
p.setID(PropertyIDMap.PID_CODEPAGE);
p.setType(Variant.VT_I2);
p.setValue(Integer.valueOf(codepage));
put(new CustomProperty(p));
}
/**
* Gets the dictionary which contains IDs and names of the named custom
* properties.
*
* @return the dictionary.
*/
Map getDictionary()
{
return dictionaryIDToName;
}
/**
* Checks against both String Name and Long ID
*/
public boolean containsKey(Object key) {
if(key instanceof Long) {
return super.containsKey((Long)key);
}
if(key instanceof String) {
return super.containsKey((Long)dictionaryNameToID.get(key));
}
return false;
}
/**
* Checks against both the property, and its values.
*/
public boolean containsValue(Object value) {
if(value instanceof CustomProperty) {
return super.containsValue((CustomProperty)value);
} else {
for(CustomProperty cp : super.values()) {
if(cp.getValue() == value) {
return true;
}
}
}
return false;
}
/**
* Gets the codepage.
*
* @return the codepage or -1 if the codepage is undefined.
*/
public int getCodepage()
{
int codepage = -1;
for (final Iterator i = this.values().iterator(); codepage == -1 && i.hasNext();)
{
final CustomProperty cp = i.next();
if (cp.getID() == PropertyIDMap.PID_CODEPAGE)
codepage = ((Integer) cp.getValue()).intValue();
}
return codepage;
}
/**
* Tells whether this {@link CustomProperties} instance is pure or one or
* more properties of the underlying low-level property set has been
* dropped.
*
* @return true if the {@link CustomProperties} is pure, else
* false.
*/
public boolean isPure()
{
return isPure;
}
/**
* Sets the purity of the custom property set.
*
* @param isPure the purity
*/
public void setPure(final boolean isPure)
{
this.isPure = isPure;
}
}