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The free Java library for Asterisk PBX integration.
/*
* Copyright 2004-2006 Stefan Reuter and others
*
* Licensed 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.asteriskjava.manager.internal;
import org.asteriskjava.AsteriskVersion;
import org.asteriskjava.manager.AsteriskMapping;
import org.asteriskjava.manager.action.ManagerAction;
import org.asteriskjava.manager.action.UserEventAction;
import org.asteriskjava.manager.event.UserEvent;
import org.asteriskjava.util.Log;
import org.asteriskjava.util.LogFactory;
import org.asteriskjava.util.ReflectionUtil;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;
/**
* Default implementation of the ActionBuilder interface.
*
* @author srt
* @version $Id$
*/
class ActionBuilderImpl implements ActionBuilder
{
private static final String LINE_SEPARATOR = "\r\n";
private static final String ATTRIBUTES_PROPERTY_NAME = "attributes";
/**
* Instance logger.
*/
private final Log logger = LogFactory.getLog(getClass());
private AsteriskVersion targetVersion;
/**
* Creates a new ActionBuilder for Asterisk 1.0.
*/
ActionBuilderImpl()
{
this.targetVersion = AsteriskVersion.ASTERISK_1_0;
}
public void setTargetVersion(AsteriskVersion targetVersion)
{
this.targetVersion = targetVersion;
}
public String buildAction(final ManagerAction action)
{
return buildAction(action, null);
}
@SuppressWarnings("unchecked")
public String buildAction(final ManagerAction action, final String internalActionId)
{
StringBuffer sb = new StringBuffer();
sb.append("action: ");
sb.append(action.getAction());
sb.append(LINE_SEPARATOR);
if (internalActionId != null)
{
sb.append("actionid: ");
sb.append(ManagerUtil.addInternalActionId(action.getActionId(), internalActionId));
sb.append(LINE_SEPARATOR);
}
else if (action.getActionId() != null)
{
sb.append("actionid: ");
sb.append(action.getActionId());
sb.append(LINE_SEPARATOR);
}
/*
* When using the Reflection API to get all of the getters for building
* actions to send, we ignore some of the getters
*/
Set ignore = new HashSet();
ignore.add("class");
ignore.add("action");
ignore.add("actionid");
ignore.add(ATTRIBUTES_PROPERTY_NAME);
// if this is a user event action, we need to grab the internal event,
// otherwise do below as normal
if (action instanceof UserEventAction)
{
UserEvent userEvent = ((UserEventAction) action).getUserEvent();
appendUserEvent(sb, userEvent);
// eventually we may want to add more Map keys for events to ignore
// when appending
appendGetters(sb, userEvent, ignore);
}
else
{
appendGetters(sb, action, ignore);
}
// actions that have the special getAttributes method will
// have their Map appended without a singular key or separator
Map getters = ReflectionUtil.getGetters(action.getClass());
if(getters.containsKey(ATTRIBUTES_PROPERTY_NAME))
{
Method getter = getters.get(ATTRIBUTES_PROPERTY_NAME);
Object value = null;
try
{
value = getter.invoke(action);
}
catch (Exception ex)
{
logger.error("Unable to retrieve property '" + ATTRIBUTES_PROPERTY_NAME + "' of " + action.getClass(), ex);
}
if(value instanceof Map)
{
Map attributes = (Map)value;
for (Map.Entry entry : attributes.entrySet())
{
appendString(sb, entry.getKey() == null ? "null" : entry.getKey().toString(),
entry.getValue() == null ? "null" : entry.getValue().toString());
}
}
}
sb.append(LINE_SEPARATOR);
return sb.toString();
}
private void appendMap(StringBuffer sb, String key, Map values)
{
String singularKey;
// strip plural s (i.e. use "variable: " instead of "variables: "
if (key.endsWith("s"))
{
singularKey = key.substring(0, key.length() - 1);
}
else
{
singularKey = key;
}
if (targetVersion.isAtLeast(AsteriskVersion.ASTERISK_1_2))
{
appendMap12(sb, singularKey, values);
}
else
{
appendMap10(sb, singularKey, values);
}
}
private void appendMap10(StringBuffer sb, String singularKey, Map values)
{
Iterator> entryIterator;
sb.append(singularKey);
sb.append(": ");
entryIterator = values.entrySet().iterator();
while (entryIterator.hasNext())
{
Map.Entry entry;
entry = entryIterator.next();
sb.append(entry.getKey());
sb.append("=");
if (entry.getValue() != null)
{
sb.append(entry.getValue());
}
if (entryIterator.hasNext())
{
sb.append("|");
}
}
sb.append(LINE_SEPARATOR);
}
private void appendMap12(StringBuffer sb, String singularKey, Map values)
{
for (Map.Entry entry : values.entrySet())
{
sb.append(singularKey);
sb.append(": ");
sb.append(entry.getKey());
sb.append("=");
if (entry.getValue() != null)
{
sb.append(entry.getValue());
}
sb.append(LINE_SEPARATOR);
}
}
private void appendString(StringBuffer sb, String key, String value)
{
sb.append(key);
sb.append(": ");
sb.append(value);
sb.append(LINE_SEPARATOR);
}
private void appendUserEvent(StringBuffer sb, UserEvent event)
{
Class clazz = event.getClass();
String className = clazz.getName();
String eventType = className.substring(className.lastIndexOf('.') + 1).toLowerCase(Locale.ENGLISH);
if (eventType.endsWith("event"))
{
eventType = eventType.substring(0, eventType.length() - "event".length());
}
appendString(sb, "UserEvent", eventType);
}
@SuppressWarnings("unchecked")
private void appendGetters(StringBuffer sb, Object action, Set membersToIgnore)
{
Map getters = ReflectionUtil.getGetters(action.getClass());
for (Map.Entry entry : getters.entrySet())
{
final String name = entry.getKey();
final Method getter = entry.getValue();
final Object value;
if (membersToIgnore.contains(name))
{
continue;
}
try
{
value = getter.invoke(action);
}
catch (Exception ex)
{
logger.error("Unable to retrieve property '" + name + "' of " + action.getClass(), ex);
continue;
}
if (value == null || value instanceof Class)
{
continue;
}
final String mappedName = mapToAsterisk(getter);
if (value instanceof Map)
{
appendMap(sb, mappedName, (Map) value);
}
else if (value instanceof String)
{
appendString(sb, mappedName, (String) value);
}
else
{
appendString(sb, mappedName, value.toString());
}
}
}
private String mapToAsterisk(Method getter)
{
AsteriskMapping annotation;
// check annotation of getter method
annotation = getter.getAnnotation(AsteriskMapping.class);
if (annotation != null)
{
return annotation.value();
}
// check annotation of setter method
String setterName = determineSetterName(getter.getName());
try
{
Method setter = getter.getDeclaringClass().getDeclaredMethod(setterName, getter.getReturnType());
annotation = setter.getAnnotation(AsteriskMapping.class);
if (annotation != null)
{
return annotation.value();
}
}
catch (NoSuchMethodException e)
{
// ok, no setter method
}
// check annotation of field
String fieldName = determineFieldName(getter.getName());
try
{
Field field = getter.getDeclaringClass().getDeclaredField(fieldName);
annotation = field.getAnnotation(AsteriskMapping.class);
if (annotation != null)
{
return annotation.value();
}
}
catch (NoSuchFieldException e)
{
// ok, no field
}
return fieldName.toLowerCase(Locale.US);
}
String determineSetterName(String getterName)
{
if (getterName.startsWith("get"))
{
return "set" + getterName.substring(3);
}
else if (getterName.startsWith("is"))
{
return "set" + getterName.substring(2);
}
else
{
throw new IllegalArgumentException("Getter '" + getterName + "' doesn't start with either 'get' or 'is'");
}
}
String determineFieldName(String accessorName)
{
if (accessorName.startsWith("get"))
{
return lcFirst(accessorName.substring(3));
}
else if (accessorName.startsWith("is"))
{
return lcFirst(accessorName.substring(2));
}
else if (accessorName.startsWith("set"))
{
return lcFirst(accessorName.substring(3));
}
else
{
throw new IllegalArgumentException("Accessor '" + accessorName + "' doesn't start with either 'get', 'is' or 'set'");
}
}
/**
* Converts the first character to lower case.
*
* @param s the string to convert.
* @return the converted string.
*/
String lcFirst(String s)
{
if (s == null || s.length() < 1)
{
return s;
}
char first = s.charAt(0);
return Character.toLowerCase(first) + s.substring(1);
}
}