javax.money.AbstractContext Maven / Gradle / Ivy
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/*
* CREDIT SUISSE IS WILLING TO LICENSE THIS SPECIFICATION TO YOU ONLY UPON THE
* CONDITION THAT YOU ACCEPT ALL OF THE TERMS CONTAINED IN THIS AGREEMENT.
* PLEASE READ THE TERMS AND CONDITIONS OF THIS AGREEMENT CAREFULLY. BY
* DOWNLOADING THIS SPECIFICATION, YOU ACCEPT THE TERMS AND CONDITIONS OF THE
* AGREEMENT. IF YOU ARE NOT WILLING TO BE BOUND BY IT, SELECT THE "DECLINE"
* BUTTON AT THE BOTTOM OF THIS PAGE. Specification: JSR-354 Money and Currency
* API ("Specification") Copyright (c) 2012-2015, Credit SUISSE All rights
* reserved.
*/
package javax.money;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
/**
* Represents a general context of data targeting an item of type {@code Q}. Contexts are used to add arbitrary
* data that cannot be be mapped in a standard way to the money API, e.g. use case or customer specific
* extensions os specialities.
* Superclasses of this class must be final, immutable, serializable and thread-safe.
*/
@SuppressWarnings("unchecked")
public abstract class AbstractContext implements Serializable {
private static final long serialVersionUID = 1L;
/**
* Key for storing the target providers to be queried
*/
protected static final String KEY_PROVIDER = "provider";
/**
* The data map containing all values.
*/
final Map data = new HashMap<>();
/**
* Private constructor, used by {@link AbstractContextBuilder}.
*
* @param builder the Builder.
*/
protected AbstractContext(AbstractContextBuilder builder) {
data.putAll(builder.data);
}
/**
* Get the present keys of all entries with a given type, checking hereby if assignable.
*
* @param type The attribute type, not null.
* @return all present keys of attributes being assignable to the type, never null.
*/
public Set getKeys(Class type) {
return data.entrySet().stream().filter(val -> type.isAssignableFrom(val.getValue()
.getClass())).map(Map.Entry::getKey).collect(Collectors
.toSet());
}
/**
* Get the current attribute type.
* @param key the entry's key, not null
* @return the current attribute type, or null, if no such attribute exists.
*/
public Class getType(String key) {
Object val = this.data.get(key);
return val == null ? null : val.getClass();
}
/**
* Access an attribute.
*
* @param type the attribute's type, not {@code null}
* @param key the attribute's key, not {@code null}
* @return the attribute value, or {@code null}.
*/
public T get(String key, Class type) {
Object value = this.data.get(key);
if (value != null && type.isAssignableFrom(value.getClass())) {
return (T) value;
}
return null;
}
/**
* Access an attribute, hereby using the class name as key.
*
* @param type the type, not {@code null}
* @return the type attribute value, or {@code null}.
*/
public T get(Class type) {
return get(type.getName(), type);
}
/**
* Access a Long attribute.
*
* @param key the attribute's key, not null.
* @return the value, or null.
*/
public Long getLong(String key) {
return get(key, Long.class);
}
/**
* Access a Float attribute.
*
* @param key the attribute's key, not null.
* @return the value, or null.
*/
public Float getFloat(String key) {
return get(key, Float.class);
}
/**
* Access an Integer attribute.
*
* @param key the attribute's key, not null.
* @return the value, or null.
*/
public Integer getInt(String key) {
return get(key, Integer.class);
}
/**
* Access a Boolean attribute.
*
* @param key the attribute's key, not null.
* @return the value, or null.
*/
public Boolean getBoolean(String key) {
return get(key, Boolean.class);
}
/**
* Access a Double attribute.
*
* @param key the attribute's key, not null.
* @return the value, or null.
*/
public Double getDouble(String key) {
return get(key, Double.class);
}
/**
* Access a String attribute.
*
* @param key the attribute's key, not null.
* @return the value, or null.
*/
public String getText(String key) {
return get(key, String.class);
}
/**
* Get the provider name of this context.
*
* @return the provider name, or null.
*/
public String getProviderName() {
return getText(KEY_PROVIDER);
}
/**
* Checks if the current instance has no attributes set. This is often the cases, when used in default cases.
*
* @return true, if no attributes are set.
*/
public boolean isEmpty() {
return this.data.isEmpty();
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return Objects.hash(data);
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof AbstractContext) {
AbstractContext other = (AbstractContext) obj;
return Objects.equals(data, other.data);
}
return false;
}
/*
* (non-Javadoc)
*
* @see Object#toString()
*/
@Override
public String toString() {
return getClass().getSimpleName() + " (\n" + data + ')';
}
}