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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.prelude.query;
/**
* A term type enumeration.
*
* @author bratseth
* @author Steinar Knutsen
*/
public class TermType {
public static final TermType RANK = new TermType("rank", Item.ItemType.RANK, RankItem.class, null, "$");
public static final TermType AND = new TermType("and", Item.ItemType.AND, AndItem.class, null, "+");
public static final TermType OR = new TermType("or", Item.ItemType.OR, OrItem.class, null, "?");
public static final TermType NOT = new TermType("not", Item.ItemType.NOT, NotItem.class, null, "-");
public static final TermType PHRASE = new TermType("phrase", Item.ItemType.PHRASE, PhraseItem.class, null, "\"");
public static final TermType EQUIV = new TermType("equiv", Item.ItemType.EQUIV, EquivItem.class, null, "");
public static final TermType DEFAULT = new TermType("", Item.ItemType.AND, CompositeItem.class, AndItem.class, "");
public final String name;
private final Item.ItemType itemType;
private final String sign;
private final Class<? extends CompositeItem> instanceClass;
private final Class<? extends CompositeItem> itemClass;
private TermType(String name,
Item.ItemType itemType,
Class<? extends CompositeItem> itemClass,
Class<? extends CompositeItem> instanceClass,
String sign) {
this.name = name;
this.itemType = itemType;
this.itemClass = itemClass;
if (instanceClass == null) {
this.instanceClass = itemClass;
} else {
this.instanceClass = instanceClass;
}
this.sign = sign;
}
public String getName() {
return name;
}
/** Returns the CompositeItem type this type corresponds to, or CompositeItem if it's the default */
public Class<? extends CompositeItem> getItemClass() {
return itemClass;
}
/** Returns true if the class corresponding to this type is the given class */
public boolean hasItemClass(Class<?> theClass) {
return getItemClass()==theClass;
}
/**
* Returns an instance of the class corresponding to the given type, AndItem
* if this is the DEFAULT type
*
* @throws RuntimeException if an instance could not be created
*/
public Item createItemClass() {
try {
return instanceClass.getDeclaredConstructor().newInstance();
} catch (Exception e) {
throw new RuntimeException("Could not create an instance for item " + this, e);
}
}
public String toSign() {
return sign;
}
public Item.ItemType toItemType() { return itemType; }
@Override
public boolean equals(Object o) {
if ( ! (o instanceof TermType)) return false;
TermType other = (TermType) o;
return name.equals(other.name);
}
@Override
public int hashCode() {
return name.hashCode();
}
@Override
public String toString() { return "term type '" + name + "'"; }
}
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