org.apache.commons.configuration.AbstractConfiguration Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.configuration;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Properties;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.iterators.FilterIterator;
import org.apache.commons.configuration.event.ConfigurationErrorEvent;
import org.apache.commons.configuration.event.ConfigurationErrorListener;
import org.apache.commons.configuration.event.EventSource;
import org.apache.commons.configuration.interpol.ConfigurationInterpolator;
import org.apache.commons.lang.BooleanUtils;
import org.apache.commons.lang.text.StrLookup;
import org.apache.commons.lang.text.StrSubstitutor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.impl.NoOpLog;
/**
* Abstract configuration class. Provides basic functionality but does not
* store any data.
* If you want to write your own Configuration class then you should
* implement only abstract methods from this class. A lot of functionality
* needed by typical implementations of the Configuration
* interface is already provided by this base class. Following is a list of
* features implemented here:
*
- Data conversion support. The various data types required by the
*
Configuration interface are already handled by this base class.
* A concrete sub class only needs to provide a generic getProperty()
* method.
* - Support for variable interpolation. Property values containing special
* variable tokens (like
${var}) will be replaced by their
* corresponding values.
* - Support for string lists. The values of properties to be added to this
* configuration are checked whether they contain a list delimiter character. If
* this is the case and if list splitting is enabled, the string is split and
* multiple values are added for this property. (With the
*
setListDelimiter() method the delimiter character can be
* specified; per default a comma is used. The
* setDelimiterParsingDisabled() method can be used to disable
* list splitting completely.)
* - Allows to specify how missing properties are treated. Per default the
* get methods returning an object will return null if the searched
* property key is not found (and no default value is provided). With the
*
setThrowExceptionOnMissing() method this behavior can be
* changed to throw an exception when a requested property cannot be found.
* - Basic event support. Whenever this configuration is modified registered
* event listeners are notified. Refer to the various
EVENT_XXX
* constants to get an impression about which event types are supported.
*
*
* @author Konstantin Shaposhnikov
* @author Oliver Heger
* @author Henning P. Schmiedehausen
* @version $Id: AbstractConfiguration.java 652316 2008-04-30 10:59:58Z ebourg $
*/
public abstract class AbstractConfiguration extends EventSource implements Configuration
{
/**
* Constant for the add property event type.
* @since 1.3
*/
public static final int EVENT_ADD_PROPERTY = 1;
/**
* Constant for the clear property event type.
* @since 1.3
*/
public static final int EVENT_CLEAR_PROPERTY = 2;
/**
* Constant for the set property event type.
* @since 1.3
*/
public static final int EVENT_SET_PROPERTY = 3;
/**
* Constant for the clear configuration event type.
* @since 1.3
*/
public static final int EVENT_CLEAR = 4;
/**
* Constant for the get property event type. This event type is used for
* error events.
* @since 1.4
*/
public static final int EVENT_READ_PROPERTY = 5;
/** start token */
protected static final String START_TOKEN = "${";
/** end token */
protected static final String END_TOKEN = "}";
/**
* Constant for the disabled list delimiter. This character is passed to the
* list parsing methods if delimiter parsing is disabled. So this character
* should not occur in string property values.
*/
private static final char DISABLED_DELIMITER = '\0';
/** The default value for listDelimiter */
private static char defaultListDelimiter = ',';
/** Delimiter used to convert single values to lists */
private char listDelimiter = defaultListDelimiter;
/**
* When set to true the given configuration delimiter will not be used
* while parsing for this configuration.
*/
private boolean delimiterParsingDisabled;
/**
* Whether the configuration should throw NoSuchElementExceptions or simply
* return null when a property does not exist. Defaults to return null.
*/
private boolean throwExceptionOnMissing;
/** Stores a reference to the object that handles variable interpolation.*/
private StrSubstitutor substitutor;
/** Stores the logger.*/
private Log log;
/**
* Creates a new instance of AbstractConfiguration.
*/
public AbstractConfiguration()
{
setLogger(null);
}
/**
* For configurations extending AbstractConfiguration, allow them to change
* the listDelimiter from the default comma (","). This value will be used
* only when creating new configurations. Those already created will not be
* affected by this change
*
* @param delimiter The new listDelimiter
*/
public static void setDefaultListDelimiter(char delimiter)
{
AbstractConfiguration.defaultListDelimiter = delimiter;
}
/**
* Sets the default list delimiter.
*
* @param delimiter the delimiter character
* @deprecated Use AbstractConfiguration.setDefaultListDelimiter(char)
* instead
*/
public static void setDelimiter(char delimiter)
{
setDefaultListDelimiter(delimiter);
}
/**
* Retrieve the current delimiter. By default this is a comma (",").
*
* @return The delimiter in use
*/
public static char getDefaultListDelimiter()
{
return AbstractConfiguration.defaultListDelimiter;
}
/**
* Returns the default list delimiter.
*
* @return the default list delimiter
* @deprecated Use AbstractConfiguration.getDefaultListDelimiter() instead
*/
public static char getDelimiter()
{
return getDefaultListDelimiter();
}
/**
* Change the list delimiter for this configuration.
*
* Note: this change will only be effective for new parsings. If you
* want it to take effect for all loaded properties use the no arg constructor
* and call this method before setting the source.
*
* @param listDelimiter The new listDelimiter
*/
public void setListDelimiter(char listDelimiter)
{
this.listDelimiter = listDelimiter;
}
/**
* Retrieve the delimiter for this configuration. The default
* is the value of defaultListDelimiter.
*
* @return The listDelimiter in use
*/
public char getListDelimiter()
{
return listDelimiter;
}
/**
* Determine if this configuration is using delimiters when parsing
* property values to convert them to lists of values. Defaults to false
* @return true if delimiters are not being used
*/
public boolean isDelimiterParsingDisabled()
{
return delimiterParsingDisabled;
}
/**
* Set whether this configuration should use delimiters when parsing
* property values to convert them to lists of values. By default delimiter
* parsing is enabled
*
* Note: this change will only be effective for new parsings. If you
* want it to take effect for all loaded properties use the no arg constructor
* and call this method before setting source.
* @param delimiterParsingDisabled a flag whether delimiter parsing should
* be disabled
*/
public void setDelimiterParsingDisabled(boolean delimiterParsingDisabled)
{
this.delimiterParsingDisabled = delimiterParsingDisabled;
}
/**
* Allows to set the throwExceptionOnMissing flag. This
* flag controls the behavior of property getter methods that return
* objects if the requested property is missing. If the flag is set to
* false (which is the default value), these methods will return
* null. If set to true, they will throw a
* NoSuchElementException exception. Note that getter methods
* for primitive data types are not affected by this flag.
*
* @param throwExceptionOnMissing The new value for the property
*/
public void setThrowExceptionOnMissing(boolean throwExceptionOnMissing)
{
this.throwExceptionOnMissing = throwExceptionOnMissing;
}
/**
* Returns true if missing values throw Exceptions.
*
* @return true if missing values throw Exceptions
*/
public boolean isThrowExceptionOnMissing()
{
return throwExceptionOnMissing;
}
/**
* Returns the object that is responsible for variable interpolation.
*
* @return the object responsible for variable interpolation
* @since 1.4
*/
public synchronized StrSubstitutor getSubstitutor()
{
if (substitutor == null)
{
substitutor = new StrSubstitutor(createInterpolator());
}
return substitutor;
}
/**
* Returns the ConfigurationInterpolator object that manages
* the lookup objects for resolving variables. Note: If this
* object is manipulated (e.g. new lookup objects added), synchronisation
* has to be manually ensured. Because
* ConfigurationInterpolator is not thread-safe concurrent
* access to properties of this configuration instance (which causes the
* interpolator to be invoked) may cause race conditions.
*
* @return the ConfigurationInterpolator associated with this
* configuration
* @since 1.4
*/
public ConfigurationInterpolator getInterpolator()
{
return (ConfigurationInterpolator) getSubstitutor()
.getVariableResolver();
}
/**
* Creates the interpolator object that is responsible for variable
* interpolation. This method is invoked on first access of the
* interpolation features. It creates a new instance of
* ConfigurationInterpolator and sets the default lookup
* object to an implementation that queries this configuration.
*
* @return the newly created interpolator object
* @since 1.4
*/
protected ConfigurationInterpolator createInterpolator()
{
ConfigurationInterpolator interpol = new ConfigurationInterpolator();
interpol.setDefaultLookup(new StrLookup()
{
public String lookup(String var)
{
Object prop = resolveContainerStore(var);
return (prop != null) ? prop.toString() : null;
}
});
return interpol;
}
/**
* Returns the logger used by this configuration object.
*
* @return the logger
* @since 1.4
*/
public Log getLogger()
{
return log;
}
/**
* Allows to set the logger to be used by this configuration object. This
* method makes it possible for clients to exactly control logging behavior.
* Per default a logger is set that will ignore all log messages. Derived
* classes that want to enable logging should call this method during their
* initialization with the logger to be used.
*
* @param log the new logger
* @since 1.4
*/
public void setLogger(Log log)
{
this.log = (log != null) ? log : new NoOpLog();
}
/**
* Adds a special
* {@link org.apache.commons.configuration.event.ConfigurationErrorListener}
* object to this configuration that will log all internal errors. This
* method is intended to be used by certain derived classes, for which it is
* known that they can fail on property access (e.g.
* DatabaseConfiguration).
*
* @since 1.4
*/
public void addErrorLogListener()
{
addErrorListener(new ConfigurationErrorListener()
{
public void configurationError(ConfigurationErrorEvent event)
{
getLogger().warn("Internal error", event.getCause());
}
});
}
public void addProperty(String key, Object value)
{
fireEvent(EVENT_ADD_PROPERTY, key, value, true);
addPropertyValues(key, value,
isDelimiterParsingDisabled() ? DISABLED_DELIMITER
: getListDelimiter());
fireEvent(EVENT_ADD_PROPERTY, key, value, false);
}
/**
* Adds a key/value pair to the Configuration. Override this method to
* provide write access to underlying Configuration store.
*
* @param key key to use for mapping
* @param value object to store
*/
protected abstract void addPropertyDirect(String key, Object value);
/**
* Adds the specified value for the given property. This method supports
* single values and containers (e.g. collections or arrays) as well. In the
* latter case, addPropertyDirect() will be called for each
* element.
*
* @param key the property key
* @param value the value object
* @param delimiter the list delimiter character
*/
private void addPropertyValues(String key, Object value, char delimiter)
{
Iterator it = PropertyConverter.toIterator(value, delimiter);
while (it.hasNext())
{
addPropertyDirect(key, it.next());
}
}
/**
* interpolate key names to handle ${key} stuff
*
* @param base string to interpolate
*
* @return returns the key name with the ${key} substituted
*/
protected String interpolate(String base)
{
Object result = interpolate((Object) base);
return (result == null) ? null : result.toString();
}
/**
* Returns the interpolated value. Non String values are returned without change.
*
* @param value the value to interpolate
*
* @return returns the value with variables substituted
*/
protected Object interpolate(Object value)
{
return PropertyConverter.interpolate(value, this);
}
/**
* Recursive handler for multple levels of interpolation.
*
* When called the first time, priorVariables should be null.
*
* @param base string with the ${key} variables
* @param priorVariables serves two purposes: to allow checking for loops,
* and creating a meaningful exception message should a loop occur. It's
* 0'th element will be set to the value of base from the first call. All
* subsequent interpolated variables are added afterward.
*
* @return the string with the interpolation taken care of
* @deprecated Interpolation is now handled by
* {@link PropertyConverter}; this method will no longer be
* called
*/
protected String interpolateHelper(String base, List priorVariables)
{
return base; // just a dummy implementation
}
public Configuration subset(String prefix)
{
return new SubsetConfiguration(this, prefix, ".");
}
public void setProperty(String key, Object value)
{
fireEvent(EVENT_SET_PROPERTY, key, value, true);
setDetailEvents(false);
try
{
clearProperty(key);
addProperty(key, value);
}
finally
{
setDetailEvents(true);
}
fireEvent(EVENT_SET_PROPERTY, key, value, false);
}
/**
* Removes the specified property from this configuration. This
* implementation performs some preparations and then delegates to
* clearPropertyDirect(), which will do the real work.
*
* @param key the key to be removed
*/
public void clearProperty(String key)
{
fireEvent(EVENT_CLEAR_PROPERTY, key, null, true);
clearPropertyDirect(key);
fireEvent(EVENT_CLEAR_PROPERTY, key, null, false);
}
/**
* Removes the specified property from this configuration. This method is
* called by clearProperty() after it has done some
* preparations. It should be overriden in sub classes. This base
* implementation is just left empty.
*
* @param key the key to be removed
*/
protected void clearPropertyDirect(String key)
{
// override in sub classes
}
public void clear()
{
fireEvent(EVENT_CLEAR, null, null, true);
setDetailEvents(false);
boolean useIterator = true;
try
{
Iterator it = getKeys();
while (it.hasNext())
{
String key = (String) it.next();
if (useIterator)
{
try
{
it.remove();
}
catch (UnsupportedOperationException usoex)
{
useIterator = false;
}
}
if (useIterator && containsKey(key))
{
useIterator = false;
}
if (!useIterator)
{
// workaround for Iterators that do not remove the property
// on calling remove() or do not support remove() at all
clearProperty(key);
}
}
}
finally
{
setDetailEvents(true);
}
fireEvent(EVENT_CLEAR, null, null, false);
}
public Iterator getKeys(final String prefix)
{
return new FilterIterator(getKeys(), new Predicate()
{
public boolean evaluate(Object obj)
{
String key = (String) obj;
return key.startsWith(prefix + ".") || key.equals(prefix);
}
});
}
public Properties getProperties(String key)
{
return getProperties(key, null);
}
/**
* Get a list of properties associated with the given configuration key.
*
* @param key The configuration key.
* @param defaults Any default values for the returned
* Properties object. Ignored if null.
*
* @return The associated properties if key is found.
*
* @throws ConversionException is thrown if the key maps to an object that
* is not a String/List of Strings.
*
* @throws IllegalArgumentException if one of the tokens is malformed (does
* not contain an equals sign).
*/
public Properties getProperties(String key, Properties defaults)
{
/*
* Grab an array of the tokens for this key.
*/
String[] tokens = getStringArray(key);
/*
* Each token is of the form 'key=value'.
*/
Properties props = defaults == null ? new Properties() : new Properties(defaults);
for (int i = 0; i < tokens.length; i++)
{
String token = tokens[i];
int equalSign = token.indexOf('=');
if (equalSign > 0)
{
String pkey = token.substring(0, equalSign).trim();
String pvalue = token.substring(equalSign + 1).trim();
props.put(pkey, pvalue);
}
else if (tokens.length == 1 && "".equals(token))
{
// Semantically equivalent to an empty Properties
// object.
break;
}
else
{
throw new IllegalArgumentException('\'' + token + "' does not contain an equals sign");
}
}
return props;
}
/**
* {@inheritDoc}
* @see PropertyConverter#toBoolean(Object)
*/
public boolean getBoolean(String key)
{
Boolean b = getBoolean(key, null);
if (b != null)
{
return b.booleanValue();
}
else
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
/**
* {@inheritDoc}
* @see PropertyConverter#toBoolean(Object)
*/
public boolean getBoolean(String key, boolean defaultValue)
{
return getBoolean(key, BooleanUtils.toBooleanObject(defaultValue)).booleanValue();
}
/**
* Obtains the value of the specified key and tries to convert it into a
* Boolean object. If the property has no value, the passed
* in default value will be used.
*
* @param key the key of the property
* @param defaultValue the default value
* @return the value of this key converted to a Boolean
* @throws ConversionException if the value cannot be converted to a
* Boolean
* @see PropertyConverter#toBoolean(Object)
*/
public Boolean getBoolean(String key, Boolean defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toBoolean(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a Boolean object", e);
}
}
}
public byte getByte(String key)
{
Byte b = getByte(key, null);
if (b != null)
{
return b.byteValue();
}
else
{
throw new NoSuchElementException('\'' + key + " doesn't map to an existing object");
}
}
public byte getByte(String key, byte defaultValue)
{
return getByte(key, new Byte(defaultValue)).byteValue();
}
public Byte getByte(String key, Byte defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toByte(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a Byte object", e);
}
}
}
public double getDouble(String key)
{
Double d = getDouble(key, null);
if (d != null)
{
return d.doubleValue();
}
else
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
public double getDouble(String key, double defaultValue)
{
return getDouble(key, new Double(defaultValue)).doubleValue();
}
public Double getDouble(String key, Double defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toDouble(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a Double object", e);
}
}
}
public float getFloat(String key)
{
Float f = getFloat(key, null);
if (f != null)
{
return f.floatValue();
}
else
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
public float getFloat(String key, float defaultValue)
{
return getFloat(key, new Float(defaultValue)).floatValue();
}
public Float getFloat(String key, Float defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toFloat(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a Float object", e);
}
}
}
public int getInt(String key)
{
Integer i = getInteger(key, null);
if (i != null)
{
return i.intValue();
}
else
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
public int getInt(String key, int defaultValue)
{
Integer i = getInteger(key, null);
if (i == null)
{
return defaultValue;
}
return i.intValue();
}
public Integer getInteger(String key, Integer defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toInteger(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to an Integer object", e);
}
}
}
public long getLong(String key)
{
Long l = getLong(key, null);
if (l != null)
{
return l.longValue();
}
else
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
public long getLong(String key, long defaultValue)
{
return getLong(key, new Long(defaultValue)).longValue();
}
public Long getLong(String key, Long defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toLong(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a Long object", e);
}
}
}
public short getShort(String key)
{
Short s = getShort(key, null);
if (s != null)
{
return s.shortValue();
}
else
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
public short getShort(String key, short defaultValue)
{
return getShort(key, new Short(defaultValue)).shortValue();
}
public Short getShort(String key, Short defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toShort(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a Short object", e);
}
}
}
/**
* {@inheritDoc}
* @see #setThrowExceptionOnMissing(boolean)
*/
public BigDecimal getBigDecimal(String key)
{
BigDecimal number = getBigDecimal(key, null);
if (number != null)
{
return number;
}
else if (isThrowExceptionOnMissing())
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
else
{
return null;
}
}
public BigDecimal getBigDecimal(String key, BigDecimal defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toBigDecimal(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a BigDecimal object", e);
}
}
}
/**
* {@inheritDoc}
* @see #setThrowExceptionOnMissing(boolean)
*/
public BigInteger getBigInteger(String key)
{
BigInteger number = getBigInteger(key, null);
if (number != null)
{
return number;
}
else if (isThrowExceptionOnMissing())
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
else
{
return null;
}
}
public BigInteger getBigInteger(String key, BigInteger defaultValue)
{
Object value = resolveContainerStore(key);
if (value == null)
{
return defaultValue;
}
else
{
try
{
return PropertyConverter.toBigInteger(interpolate(value));
}
catch (ConversionException e)
{
throw new ConversionException('\'' + key + "' doesn't map to a BigDecimal object", e);
}
}
}
/**
* {@inheritDoc}
* @see #setThrowExceptionOnMissing(boolean)
*/
public String getString(String key)
{
String s = getString(key, null);
if (s != null)
{
return s;
}
else if (isThrowExceptionOnMissing())
{
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
else
{
return null;
}
}
public String getString(String key, String defaultValue)
{
Object value = resolveContainerStore(key);
if (value instanceof String)
{
return interpolate((String) value);
}
else if (value == null)
{
return interpolate(defaultValue);
}
else
{
throw new ConversionException('\'' + key + "' doesn't map to a String object");
}
}
/**
* Get an array of strings associated with the given configuration key.
* If the key doesn't map to an existing object, an empty array is returned.
* If a property is added to a configuration, it is checked whether it
* contains multiple values. This is obvious if the added object is a list
* or an array. For strings it is checked whether the string contains the
* list delimiter character that can be specified using the
* setListDelimiter() method. If this is the case, the string
* is splitted at these positions resulting in a property with multiple
* values.
*
* @param key The configuration key.
* @return The associated string array if key is found.
*
* @throws ConversionException is thrown if the key maps to an
* object that is not a String/List of Strings.
* @see #setListDelimiter(char)
* @see #setDelimiterParsingDisabled(boolean)
*/
public String[] getStringArray(String key)
{
Object value = getProperty(key);
String[] array;
if (value instanceof String)
{
array = new String[1];
array[0] = interpolate((String) value);
}
else if (value instanceof List)
{
List list = (List) value;
array = new String[list.size()];
for (int i = 0; i < array.length; i++)
{
array[i] = interpolate((String) list.get(i));
}
}
else if (value == null)
{
array = new String[0];
}
else
{
throw new ConversionException('\'' + key + "' doesn't map to a String/List object");
}
return array;
}
/**
* {@inheritDoc}
* @see #getStringArray(String)
*/
public List getList(String key)
{
return getList(key, new ArrayList());
}
public List getList(String key, List defaultValue)
{
Object value = getProperty(key);
List list;
if (value instanceof String)
{
list = new ArrayList(1);
list.add(interpolate((String) value));
}
else if (value instanceof List)
{
list = new ArrayList();
List l = (List) value;
// add the interpolated elements in the new list
Iterator it = l.iterator();
while (it.hasNext())
{
list.add(interpolate(it.next()));
}
}
else if (value == null)
{
list = defaultValue;
}
else if (value.getClass().isArray())
{
return Arrays.asList((Object[]) value);
}
else
{
throw new ConversionException('\'' + key + "' doesn't map to a List object: " + value + ", a "
+ value.getClass().getName());
}
return list;
}
/**
* Returns an object from the store described by the key. If the value is a
* Collection object, replace it with the first object in the collection.
*
* @param key The property key.
*
* @return value Value, transparently resolving a possible collection dependency.
*/
protected Object resolveContainerStore(String key)
{
Object value = getProperty(key);
if (value != null)
{
if (value instanceof Collection)
{
Collection collection = (Collection) value;
value = collection.isEmpty() ? null : collection.iterator().next();
}
else if (value.getClass().isArray() && Array.getLength(value) > 0)
{
value = Array.get(value, 0);
}
}
return value;
}
/**
* Copies the content of the specified configuration into this
* configuration. If the specified configuration contains a key that is also
* present in this configuration, the value of this key will be replaced by
* the new value. Note: This method won't work well when copying
* hierarchical configurations because it is not able to copy information
* about the properties' structure (i.e. the parent-child-relationships will
* get lost). So when dealing with hierarchical configuration objects their
* {@link HierarchicalConfiguration#clone() clone()} methods
* should be used.
*
* @param c the configuration to copy (can be null, then this
* operation will have no effect)
* @since 1.5
*/
public void copy(Configuration c)
{
if (c != null)
{
for (Iterator it = c.getKeys(); it.hasNext();)
{
String key = (String) it.next();
Object value = c.getProperty(key);
fireEvent(EVENT_SET_PROPERTY, key, value, true);
setDetailEvents(false);
try
{
clearProperty(key);
addPropertyValues(key, value, DISABLED_DELIMITER);
}
finally
{
setDetailEvents(true);
}
fireEvent(EVENT_SET_PROPERTY, key, value, false);
}
}
}
/**
* Appends the content of the specified configuration to this configuration.
* The values of all properties contained in the specified configuration
* will be appended to this configuration. So if a property is already
* present in this configuration, its new value will be a union of the
* values in both configurations. Note: This method won't work
* well when appending hierarchical configurations because it is not able to
* copy information about the properties' structure (i.e. the
* parent-child-relationships will get lost). So when dealing with
* hierarchical configuration objects their
* {@link HierarchicalConfiguration#clone() clone()} methods
* should be used.
*
* @param c the configuration to be appended (can be null, then this
* operation will have no effect)
* @since 1.5
*/
public void append(Configuration c)
{
if (c != null)
{
for (Iterator it = c.getKeys(); it.hasNext();)
{
String key = (String) it.next();
Object value = c.getProperty(key);
fireEvent(EVENT_ADD_PROPERTY, key, value, true);
addPropertyValues(key, value, DISABLED_DELIMITER);
fireEvent(EVENT_ADD_PROPERTY, key, value, false);
}
}
}
/**
* Returns a configuration with the same content as this configuration, but
* with all variables replaced by their actual values. This method tries to
* clone the configuration and then perform interpolation on all properties.
* So property values of the form ${var} will be resolved as
* far as possible (if a variable cannot be resolved, it remains unchanged).
* This operation is useful if the content of a configuration is to be
* exported or processed by an external component that does not support
* variable interpolation.
*
* @return a configuration with all variables interpolated
* @throws ConfigurationRuntimeException if this configuration cannot be
* cloned
* @since 1.5
*/
public Configuration interpolatedConfiguration()
{
// first clone this configuration
AbstractConfiguration c = (AbstractConfiguration) ConfigurationUtils
.cloneConfiguration(this);
// now perform interpolation
c.setDelimiterParsingDisabled(true);
for (Iterator it = getKeys(); it.hasNext();)
{
String key = (String) it.next();
c.setProperty(key, getList(key));
}
c.setDelimiterParsingDisabled(isDelimiterParsingDisabled());
return c;
}
}
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