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/*
* 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.tuscany.sca.interfacedef.impl;
import java.lang.ref.WeakReference;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.tuscany.sca.interfacedef.DataType;
/**
* Representation of the type of data associated with an operation. Data is
* represented in two forms: the physical form used by the runtime and a logical
* form used by the assembly. The physical form is a Java Type because the
* runtime is written in Java. This may be the same form used by the application
* but it may not; for example, an application that is performing stream
* processing may want a physical form such as an
* {@link java.io.InputStream InputStream} to semantically operate on application
* data such as a purchase order. The logical description is that used by the
* assembly model and is an identifier into some well-known type space; examples
* may be a Java type represented by its Class or an XML type represented by its
* QName. Every data type may also contain metadata describing the expected
* data; for example, it could specify a preferred data binding technology or
* the size of a typical instance.
*
* @version $Rev$ $Date$
* @tuscany.spi.extension.asclient
*/
public class DataTypeImpl<L> implements DataType<L> {
private String dataBinding;
private WeakReference<Class<?>> physical;
private WeakReference<Type> genericType;
private L logical;
private Map<Class<?>, Object> metaDataMap;
/**
* Construct a data type specifying the physical and logical types.
*
* @param physical the physical class used by the runtime
* @param logical the logical type
* @see #getLogical()
*/
public DataTypeImpl(Class<?> physical, L logical) {
this(null, physical, physical, logical);
}
/**
* @param dataBinding
* @param physical
* @param logical
*/
public DataTypeImpl(String dataBinding, Class<?> physical, L logical) {
this(dataBinding, physical, physical, logical);
}
/**
* @param dataBinding
* @param physical
* @param genericType
* @param logical
*/
public DataTypeImpl(String dataBinding, Class<?> physical, Type genericType, L logical) {
super();
this.dataBinding = dataBinding;
this.physical = new WeakReference<Class<?>>(physical);
this.genericType = new WeakReference<Type>(genericType);
this.logical = logical;
}
/**
* Returns the physical type used by the runtime.
*
* @return the physical type used by the runtime
*/
public Class<?> getPhysical() {
return physical.get();
}
/**
* @param physical the physical to set
*/
public void setPhysical(Class<?> physical) {
this.physical = new WeakReference<Class<?>>(physical);
}
/**
* Get the java generic type
* @return The java generic type
*/
public Type getGenericType() {
return genericType.get();
}
/**
* Set the java generic type
* @param genericType
*/
public void setGenericType(Type genericType) {
this.genericType = new WeakReference<Type>(genericType);
}
/**
* Returns the logical identifier used by the assembly. The type of this
* value identifies the logical type system in use. Known values are:
* <ul>
* <li>a java.lang.reflect.Type identifies a Java type by name and
* ClassLoader; this includes Java Classes as they are specializations of
* Type</li>
* <li>a javax.xml.namespace.QName identifies an XML type by local name and
* namespace</li>
* </ul>
*
* @return the logical type name
*/
public L getLogical() {
return logical;
}
/**
* @param logical the logical to set
*/
public void setLogical(L logical) {
this.logical = logical;
}
public String getDataBinding() {
return dataBinding;
}
/**
* @param dataBinding the dataBinding to set
*/
public void setDataBinding(String dataBinding) {
this.dataBinding = dataBinding;
}
@Override
public String toString() {
StringBuilder b = new StringBuilder( 256 );
b.append( "DataType[" );
b.append( "dataBinding=" + ((dataBinding==null) ? "null" : dataBinding) );
b.append( ", genericType=" + ((genericType==null || genericType.get() == null) ? "null" : genericType) );
b.append( ", physical=" + ((physical==null || physical.get() == null) ? "null" : physical) );
b.append( ", logical=" + ((logical==null) ? "null" : logical) );
b.append( ", metaData size=" + ((metaDataMap==null) ? "0" : metaDataMap.size()) );
b.append( "]" );
return b.toString();
}
@SuppressWarnings("unchecked")
@Override
public Object clone() throws CloneNotSupportedException {
DataTypeImpl copy = (DataTypeImpl)super.clone();
//
// When using a DataTypeImpl with java:array databinding,
// 'logical' will be another DataTypeImpl. Doing only
// a shallow copy means that resetting the databinding will
// have an unexpected side effect on the original. Though
// we could special case the java:array-databinding case,
// instead do it more generally when the logical is another
// DataType.
//
if (logical instanceof DataType) {
DataType logicalDT = (DataType)logical;
copy.logical = logicalDT.clone();
}
return copy;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((dataBinding == null) ? 0 : dataBinding.hashCode());
result = prime * result + ((genericType == null || genericType.get() == null) ? 0 : genericType.hashCode());
result = prime * result + ((logical == null) ? 0 : logical.hashCode());
result = prime * result + ((physical == null || physical.get() == null) ? 0 : physical.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final DataTypeImpl other = (DataTypeImpl)obj;
if (dataBinding == null) {
if (other.dataBinding != null)
return false;
} else if (!dataBinding.equals(other.dataBinding))
return false;
if (genericType == null || genericType.get() == null) {
if (other.genericType != null && other.genericType.get() != null)
return false;
} else if (!genericType.get().equals(other.genericType.get()))
return false;
if (logical == null) {
if (other.logical != null)
return false;
} else if (!logical.equals(other.logical))
return false;
if (physical == null || physical.get() == null) {
if (other.physical != null && other.physical.get() != null)
return false;
} else if (!physical.get().equals(other.physical.get()))
return false;
return true;
}
public <T> T getMetaData(Class<T> type) {
return metaDataMap == null ? null : type.cast(metaDataMap.get(type));
}
public <T> void setMetaData(Class<T> type, T metaData) {
if (metaDataMap == null) {
metaDataMap = new ConcurrentHashMap<Class<?>, Object>();
}
metaDataMap.put(type, metaData);
}
}
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