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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.component.chain;
import com.yahoo.component.ComponentId;
import com.yahoo.component.chain.dependencies.ordering.ChainBuilder;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* An immutable ordered list of components
*
* @author Tony Vaagenes
*/
public class Chain<COMPONENT extends ChainedComponent> {
final private List<COMPONENT> componentList;
private final ComponentId id;
/** Create a chain directly. This will NOT order the chain by the ordering constraints. */
public Chain(String id, List<COMPONENT> componentList) {
this(new ComponentId(id), componentList);
}
/** Create a chain directly. This will NOT order the chain by the ordering constraints. */
public Chain(ComponentId id, List<COMPONENT> componentList) {
this.id = id;
this.componentList = List.copyOf(componentList);
}
/** Create a chain directly. This will NOT order the chain by the ordering constraints. */
public Chain(List<COMPONENT> componentList) {
this(new ComponentId("anonymous chain"), componentList);
}
/** Create a chain directly. This will NOT order the chain by the ordering constraints. */
@SafeVarargs
public Chain(COMPONENT... components) {
this("anonymous chain", components);
}
/** Create a chain directly. This will NOT order the chain by the ordering constraints. */
@SafeVarargs
public Chain(String id, COMPONENT... components) {
this(new ComponentId(id), components);
}
/** Create a chain directly. This will NOT order the chain by the ordering constraints. */
@SafeVarargs
@SuppressWarnings("varargs")
public Chain(ComponentId id, COMPONENT... components) {
this(id, Arrays.<COMPONENT>asList(components));
}
/** Create a chain by using a builder. This will order the chain by the ordering constraints. */
public Chain(ComponentId id, Collection<COMPONENT> components, Collection<Phase> phases) {
this(id, buildChain(
emptyListIfNull(components),
emptyListIfNull(phases)).components());
}
public ComponentId getId() {
return id;
}
private static <T> Collection<T> emptyListIfNull(Collection<T> collection) {
return collection == null ? Collections.<T>emptyList() : collection;
}
private static <T extends ChainedComponent> Chain<T> buildChain(Collection<T> components, Collection<Phase> phases) {
ChainBuilder<T> builder = new ChainBuilder<>(new ComponentId("temp"));
for (Phase phase : phases) {
builder.addPhase(phase);
}
for (T component : components) {
builder.addComponent(component);
}
return builder.orderNodes();
}
public List<COMPONENT> components() {
return componentList;
}
public
@Override
String toString() {
StringBuilder b = new StringBuilder("chain '");
b.append(getId().stringValue());
b.append("' [");
appendComponent(0, b);
appendComponent(1, b);
if (components().size() > 3)
b.append("... -> ");
if (components().size() > 2)
appendComponent(components().size() - 1, b);
b.append("]");
return b.toString();
}
private void appendComponent(int i, StringBuilder b) {
if (i >= components().size()) return;
b.append(components().get(i).getId().stringValue());
if (i < components().size() - 1)
b.append(" -> ");
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Chain<?> chain = (Chain<?>) o;
if (!componentList.equals(chain.componentList)) return false;
if (!id.equals(chain.id)) return false;
return true;
}
@Override
public int hashCode() {
int result = componentList.hashCode();
result = 31 * result + id.hashCode();
return result;
}
}
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