AbstractBuilder.java
/*
* #%L
* prolobjectlink-jpi
* %%
* Copyright (C) 2019 Prolobjectlink Project
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
package io.github.prolobjectlink.prolog;
/**
* Partial implementation of Prolog Builder interface. Is an String Builder
* wrapper to append the term in string form that compound the final clause
* (Fact, Rule or Query).
*
* @author Jose Zalacain
* @since 1.0
*/
abstract class AbstractBuilder implements PrologBuilder {
protected StringBuilder builder;
protected final PrologEngine engine;
private final PrologProvider provider;
AbstractBuilder(PrologEngine engine) {
this.provider = engine.getProvider();
this.builder = new StringBuilder();
this.engine = engine;
}
protected final void append(Object object) {
builder.append(object);
}
protected final void append(String functor, PrologTerm... arguments) {
if (arguments != null && arguments.length > 0) {
builder.append(provider.newStructure(functor, arguments));
} else {
builder.append(provider.newAtom(functor));
}
}
protected final void append(Object left, String operator, Object right) {
builder.append(left);
append(' ');
builder.append(operator);
append(' ');
builder.append(right);
}
public final PrologEngine getEngine() {
return engine;
}
@Override
public final boolean equals(Object object) {
if (this == object)
return true;
if (object == null)
return false;
if (getClass() != object.getClass())
return false;
DefaultQueryBuilder other = (DefaultQueryBuilder) object;
if (engine == null) {
if (other.engine != null)
return false;
} else if (!engine.equals(other.engine)) {
return false;
}
if (builder == null) {
if (other.builder != null)
return false;
} else if (!builder.toString().equals(other.builder.toString())) {
return false;
}
return true;
}
@Override
public final int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((engine == null) ? 0 : engine.hashCode());
result = prime * result + ((builder == null) ? 0 : builder.hashCode());
return result;
}
@Override
public final String toString() {
return "" + builder + "";
}
}