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Apache Commons VFS is a Virtual File System library.
/*
* 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.vfs2;
/**
* Abstract class which has the right to fill FileSystemOptions.
*/
public abstract class FileSystemConfigBuilder {
/** Default prefix to use when resolving system properties */
private static final String PREFIX = "vfs.";
/** The root uri of the file system */
private static final String ROOTURI = "rootURI";
/** The prefix to use when resolving system properties */
private final String prefix;
/**
* Construct builder with default prefix.
*
* @since 1.0
*/
protected FileSystemConfigBuilder() {
this.prefix = PREFIX;
}
/**
* Construct builder with specified component name.
*
* @param component component name to be used in prefix
*
* @since 2.0
*/
protected FileSystemConfigBuilder(final String component) {
this.prefix = PREFIX + component;
}
/**
* The root URI of the file system.
*
* @param opts the file system options to modify
* @param rootURI The creator name to be associated with the file.
*
* @since 2.0
*/
public void setRootURI(final FileSystemOptions opts, final String rootURI) {
setParam(opts, ROOTURI, rootURI);
}
/**
* Return the root URI of the file system.
*
* @param opts file system options to work with
* @return The root URI
*
* @since 2.0
*/
public String getRootURI(final FileSystemOptions opts) {
return getString(opts, ROOTURI);
}
/**
* Set named parameter.
*
* @param opts the file system options to modify
* @param name set option with this name
* @param value boolean value to set
*
* @since 2.1
*/
protected void setParam(final FileSystemOptions opts, final String name, final boolean value) {
setParam(opts, name, Boolean.valueOf(value));
}
/**
* Set named parameter.
*
* @param opts the file system options to modify
* @param name set option with this name
* @param value object value to set
*
* @since 1.0
*/
protected void setParam(final FileSystemOptions opts, final String name, final Object value) {
opts.setOption(getConfigClass(), name, value);
}
/**
* Get named parameter.
*
* @param opts file system options to work with
* @param name get option with this name
* @return the named option or null
*
* @since 1.0
*/
protected Object getParam(final FileSystemOptions opts, final String name) {
if (opts == null) {
return null;
}
return opts.getOption(getConfigClass(), name);
}
/**
* Check if option exists.
*
* @param opts file system options to work with
* @param name the name to look up in {@code opts}
* @return true if opts have the named parameter
*
* @since 1.0
*/
protected boolean hasParam(final FileSystemOptions opts, final String name) {
return opts != null && opts.hasOption(getConfigClass(), name);
}
/**
* Is named setting specified.
*
* @param opts file system options to work with
* @param name the option to check in {@code opts} or system properties
* @return true if option exists
*
* @since 2.0
*/
protected boolean hasObject(final FileSystemOptions opts, final String name) {
return hasParam(opts, name) || System.getProperties().containsKey(toPropertyKey(name));
}
/**
* Get named option as boolean.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getBoolean(FileSystemOptions, String, Boolean)
*
* @since 2.0
*/
protected Boolean getBoolean(final FileSystemOptions opts, final String name) {
return getBoolean(opts, name, null);
}
/**
* Get named option as boolean.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getBoolean(FileSystemOptions, String, Boolean)
*
* @since 2.0
*/
protected boolean getBoolean(final FileSystemOptions opts, final String name, final boolean defaultValue) {
return getBoolean(opts, name, Boolean.valueOf(defaultValue)).booleanValue();
}
/**
* Get named option as boolean.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getBoolean(FileSystemOptions, String, Boolean)
*
* @since 2.0
*/
protected Boolean getBoolean(final FileSystemOptions opts, final String name, final Boolean defaultValue) {
Boolean value = (Boolean) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null) {
return defaultValue;
}
value = Boolean.valueOf(str);
}
return value;
}
/**
* Get named option as byte.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getByte(FileSystemOptions, String, Byte)
*
* @since 2.0
*/
protected Byte getByte(final FileSystemOptions opts, final String name) {
return getByte(opts, name, null);
}
/**
* Get named option as byte.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getByte(FileSystemOptions, String, Byte)
*
* @since 2.0
*/
protected byte getByte(final FileSystemOptions opts, final String name, final byte defaultValue) {
return getByte(opts, name, Byte.valueOf(defaultValue)).byteValue();
}
/**
* Get named option as byte.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
*
* @since 2.0
*/
protected Byte getByte(final FileSystemOptions opts, final String name, final Byte defaultValue) {
Byte value = (Byte) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null) {
return defaultValue;
}
value = Byte.valueOf(str);
}
return value;
}
/**
* Get named option as character.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getCharacter(FileSystemOptions, String, Character)
*
* @since 2.0
*/
protected Character getCharacter(final FileSystemOptions opts, final String name) {
return getCharacter(opts, name, null);
}
/**
* Get named option as character.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getCharacter(FileSystemOptions, String, Character)
*
* @since 2.0
*/
protected char getCharacter(final FileSystemOptions opts, final String name, final char defaultValue) {
return getCharacter(opts, name, new Character(defaultValue)).charValue();
}
/**
* Get named option as character.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
*
* @since 2.0
*/
protected Character getCharacter(final FileSystemOptions opts, final String name, final Character defaultValue) {
Character value = (Character) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null || str.length() <= 0) {
return defaultValue;
}
value = new Character(str.charAt(0));
}
return value;
}
/**
* Get named option as double.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getDouble(FileSystemOptions, String, Double)
*
* @since 2.0
*/
protected Double getDouble(final FileSystemOptions opts, final String name) {
return getDouble(opts, name, null);
}
/**
* Get named option as double.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getDouble(FileSystemOptions, String, Double)
*
* @since 2.0
*/
protected double getDouble(final FileSystemOptions opts, final String name, final double defaultValue) {
return getDouble(opts, name, new Double(defaultValue)).doubleValue();
}
/**
* Get named option as double.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
*
* @since 2.0
*/
protected Double getDouble(final FileSystemOptions opts, final String name, final Double defaultValue) {
Double value = (Double) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null || str.length() <= 0) {
return defaultValue;
}
value = Double.valueOf(str);
}
return value;
}
/**
* Get named option as enumeration.
*
* @param enumeration type
* @param enumClass class of enumeration type
* @param opts file system options to work with
* @param name the option name *
* @return the option in {@code opts} or system properties, otherwise null
* @see #getEnum(Class, FileSystemOptions, String, Enum)
* @throws IllegalArgumentException if option value is not a known enumeration.
*
* @since 2.1
*/
protected > E getEnum(final Class enumClass, final FileSystemOptions opts, final String name) {
return this.getEnum(enumClass, opts, name, null);
}
/**
* Get named option as enumeration.
*
* @param enumeration type
* @param enumClass class of enumeration type
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getEnum(Class, FileSystemOptions, String, Enum)
* @throws IllegalArgumentException if option value is not a known enumeration.
*
* @since 2.1
*/
protected > E getEnum(final Class enumClass, final FileSystemOptions opts, final String name,
final E defaultValue) {
@SuppressWarnings("unchecked")
E value = (E) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null) {
return defaultValue;
}
value = Enum.valueOf(enumClass, str);
}
return value;
}
/**
* Get named option as float.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getFloat(FileSystemOptions, String, Float)
* @throws NumberFormatException if option value is not a valid float.
*
* @since 2.0
*/
protected Float getFloat(final FileSystemOptions opts, final String name) {
return getFloat(opts, name, null);
}
/**
* Get named option as float.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getFloat(FileSystemOptions, String, Float)
* @throws NumberFormatException if option value is not a valid float.
*
* @since 2.0
*/
protected float getFloat(final FileSystemOptions opts, final String name, final float defaultValue) {
return getFloat(opts, name, new Float(defaultValue)).floatValue();
}
/**
* Get named option as float.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @throws NumberFormatException if option value is not a valid float.
*
* @since 2.0
*/
protected Float getFloat(final FileSystemOptions opts, final String name, final Float defaultValue) {
Float value = (Float) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null || str.length() <= 0) {
return defaultValue;
}
value = Float.valueOf(str);
}
return value;
}
/**
* Get named option as integer.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getInteger(FileSystemOptions, String, Integer)
* @throws NumberFormatException if option value is not a valid integer.
*
* @since 2.0
*/
protected Integer getInteger(final FileSystemOptions opts, final String name) {
return getInteger(opts, name, null);
}
/**
* Get named option as integer.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getInteger(FileSystemOptions, String, Integer)
* @throws NumberFormatException if option value is not a valid integer.
*
* @since 2.0
*/
protected int getInteger(final FileSystemOptions opts, final String name, final int defaultValue) {
return getInteger(opts, name, Integer.valueOf(defaultValue)).intValue();
}
/**
* Get named option as integer.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @throws NumberFormatException if option value is not a valid integer.
*
* @since 2.0
*/
protected Integer getInteger(final FileSystemOptions opts, final String name, final Integer defaultValue) {
Integer value = (Integer) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null) {
return defaultValue;
}
value = Integer.valueOf(str);
}
return value;
}
/**
* Get named option as long.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getLong(FileSystemOptions, String, Long)
* @throws NumberFormatException if option value is not a valid long.
*
* @since 2.0
*/
protected Long getLong(final FileSystemOptions opts, final String name) {
return getLong(opts, name, null);
}
/**
* Get named option as long.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getLong(FileSystemOptions, String, Long)
* @throws NumberFormatException if option value is not a valid long.
*
* @since 2.0
*/
protected long getLong(final FileSystemOptions opts, final String name, final long defaultValue) {
return getLong(opts, name, Long.valueOf(defaultValue)).longValue();
}
/**
* Get named option as long.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @throws NumberFormatException if option value is not a valid long.
*
* @since 2.0
*/
protected Long getLong(final FileSystemOptions opts, final String name, final Long defaultValue) {
Long value = (Long) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null) {
return defaultValue;
}
value = Long.valueOf(str);
}
return value;
}
/**
* Get named option as short.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getShort(FileSystemOptions, String, Short)
* @throws NumberFormatException if option value is not a valid short.
*
* @since 2.0
*/
protected Short getShort(final FileSystemOptions opts, final String name) {
return getShort(opts, name, null);
}
/**
* Get named option as short.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @see #getShort(FileSystemOptions, String, Short)
* @throws NumberFormatException if option value is not a valid short
*
* @since 2.0
*/
protected short getShort(final FileSystemOptions opts, final String name, final short defaultValue) {
return getShort(opts, name, Short.valueOf(defaultValue)).shortValue();
}
/**
* Get named option as short.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
* @throws NumberFormatException if option value is not a valid short
*
* @since 2.0
*/
protected Short getShort(final FileSystemOptions opts, final String name, final Short defaultValue) {
Short value = (Short) getParam(opts, name);
if (value == null) {
final String str = getProperty(name);
if (str == null) {
return defaultValue;
}
value = Short.valueOf(str);
}
return value;
}
/**
* Get named option as String.
*
* @param opts file system options to work with
* @param name the option name
* @return the option in {@code opts} or system properties, otherwise null
* @see #getString(FileSystemOptions, String, String)
*
* @since 2.0
*/
protected String getString(final FileSystemOptions opts, final String name) {
return getString(opts, name, null);
}
/**
* Get named option as String.
*
* @param opts file system options to work with
* @param name the option name
* @param defaultValue value to return if option is not present
* @return the option in {@code opts} or system properties, otherwise {@code defaultValue}
*
* @since 2.0
*/
protected String getString(final FileSystemOptions opts, final String name, final String defaultValue) {
String value = (String) getParam(opts, name);
if (value == null) {
value = getProperty(name);
if (value == null) {
return defaultValue;
}
}
return value;
}
/**
* Get the target of this configuration.
*
* @return the specific file system class
*
* @since 1.0
*/
protected abstract Class getConfigClass();
/**
* Converts the given name into a System property key.
*
* @param name a name to combine with the builder prefix
* @return name of system property
*
* @since 2.1
*/
private String toPropertyKey(final String name) {
return this.prefix + name;
}
/**
* Get the system property for the given name.
*
* @param name The name to lookup combined with the prefix.
* @return a system property or null
*
* @since 2.1
*/
private String getProperty(final String name) {
return System.getProperty(toPropertyKey(name));
}
}
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