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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.spi.model;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
/**
* 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
* semantially 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 $Rev$ $Date$
*/
public class DataType<L> extends ModelObject implements Cloneable {
private String dataBinding = Object.class.getName();
private final Type physical;
private final L logical;
private Map<String, Object> metadata = new HashMap<String, Object>();
private Operation operation;
/**
* 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 DataType(Type physical, L logical) {
this.physical = physical;
this.logical = logical;
if (physical instanceof Class) {
this.dataBinding = ((Class) physical).getName();
}
}
public DataType(String dataBinding, Type physical, L logical) {
this.dataBinding = dataBinding;
this.physical = physical;
this.logical = logical;
}
/**
* Returns the physical type used by the runtime.
*
* @return the physical type used by the runtime
*/
public Type getPhysical() {
return physical;
}
/**
* 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;
}
/**
* Returns all metadata about this type.
*
* @return all metadata about this type
*/
public Map<String, ?> getMetadata() {
return metadata;
}
/**
* Returns the specified metadata item or null if not present.
*
* @param name the name of the metadata item
* @return the value, or null if not present
*/
public Object getMetadata(String name) {
return metadata.get(name);
}
/**
* Sets the specified metadata value. A null value undefines it.
*
* @param name the name of the metadata item
* @param value the value, or null to undefine
* @return the old value for the item, or null if not present
*/
public Object setMetadata(String name, Object value) {
if (value == null) {
return metadata.remove(name);
} else {
return metadata.put(name, value);
}
}
public String getDataBinding() {
if (dataBinding == null) {
// databinding is not set at the DataType level, check the operation
Operation<?> operation = (Operation<?>) getOperation();
if (operation != null) {
return operation.getDataBinding();
}
}
return dataBinding;
}
/**
* @param dataBinding the dataBinding to set
*/
public void setDataBinding(String dataBinding) {
this.dataBinding = dataBinding;
}
public int hashCode() {
int result;
result = dataBinding != null ? dataBinding.hashCode() : 0;
result = 29 * result + (physical != null ? physical.hashCode() : 0);
result = 29 * result + (logical != null ? logical.hashCode() : 0);
// Commented the following line out since it causes infinite loop from Operation.hashCode()
// if the metadata map contains the Operation
// result = 29 * result + (metadata != null ? metadata.hashCode() : 0);
return result;
}
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final DataType dataType = (DataType) o;
if (dataBinding != null ? !dataBinding.equals(dataType.dataBinding) : dataType.dataBinding != null) {
return false;
}
if (logical != null ? !logical.equals(dataType.logical) : dataType.logical != null) {
return false;
}
return !(physical != null ? !physical.equals(dataType.physical) : dataType.physical != null);
}
// @SuppressWarnings("unchecked")
// public boolean equals(Object o) {
// if (this == o) {
// return true;
// }
// if (o == null || getClass() != o.getClass()) {
// return false;
// }
//
// final DataType dataType = (DataType) o;
//
// if (logical instanceof Class && dataType.logical instanceof Class) {
// Class<?> logicalClass = (Class<?>) logical;
// Class<?> targetLogicalClass = (Class<?>) dataType.logical;
// if (!logicalClass.isAssignableFrom(targetLogicalClass)) {
// return false;
// }
// } else {
// if (logical != null ? !logical.equals(dataType.logical) : dataType.logical != null) {
// return false;
// }
// }
// if (physical instanceof Class && dataType.physical instanceof Class) {
// Class<?> physicalClass = (Class<?>) physical;
// Class<?> physicalTargetClass = (Class<?>) dataType.physical;
// if (dataBinding != null
// && dataType.dataBinding != null
// && dataBinding.equals(physicalClass.getName())
// && dataType.dataBinding.equals(physicalTargetClass.getName())) {
// return physicalClass.isAssignableFrom(physicalTargetClass);
// }
// if (!physicalClass.isAssignableFrom(physicalTargetClass)) {
// return false;
// }
// return !(dataBinding != null ? !dataBinding.equals(dataType.dataBinding) : dataType.dataBinding != null);
//
//
// }
//
// if (dataBinding != null ? !dataBinding.equals(dataType.dataBinding) : dataType.dataBinding != null) {
// return false;
// }
//
// return !(physical != null ? !physical.equals(dataType.physical) : dataType.physical != null);
// }
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append(physical).append(" ").append(dataBinding).append(" ").append(logical);
return sb.toString();
}
@SuppressWarnings("unchecked")
@Override
public Object clone() throws CloneNotSupportedException {
DataType<L> copy = (DataType<L>) super.clone();
assert this.metadata instanceof HashMap;
copy.metadata = (HashMap<String, Object>) ((HashMap) this.metadata).clone();
return copy;
}
public Operation getOperation() {
return operation;
}
public void setOperation(Operation operation) {
this.operation = operation;
}
}
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