com.torodb.core.language.AttributeReference.java Source code

Introduction

Here is the source code for com.torodb.core.language.AttributeReference.java

Source

/*
 * ToroDB
 * Copyright  2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.core.language;

import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;

import java.io.Serializable;
import java.util.Collections;
import java.util.List;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;

/**
 *
 */
@Immutable
public class AttributeReference implements Serializable {

    public static final AttributeReference EMPTY_REFERENCE = new AttributeReference(
            Collections.<Key<?>>emptyList());
    private static final long serialVersionUID = 1L;

    @Nonnull
    private final List<Key<?>> keys;

    public AttributeReference(@Nonnull List<Key<?>> keys) {
        this.keys = ImmutableList.copyOf(keys);
    }

    @Nonnull
    public List<Key<?>> getKeys() {
        return keys;
    }

    /**
     *
     * @param from
     * @param to   not included
     * @return
     */
    public AttributeReference subReference(int from, int to) {
        return new AttributeReference(keys.subList(from, to));
    }

    public AttributeReference append(AttributeReference.Key<?> tail) {
        return new AttributeReference(
                ImmutableList.<AttributeReference.Key<?>>builder().addAll(keys).add(tail).build());
    }

    public AttributeReference append(AttributeReference tail) {
        return append(tail.getKeys());
    }

    public AttributeReference append(List<? extends Key<?>> tail) {
        ImmutableList<Key<?>> newList = ImmutableList.copyOf(Iterables.concat(this.keys, tail));
        return new AttributeReference(newList);
    }

    public AttributeReference prepend(List<? extends Key<?>> head) {
        return new AttributeReference(ImmutableList.copyOf(Iterables.concat(head, this.keys)));
    }

    @Override
    public String toString() {
        return Joiner.on(".").join(keys);
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 67 * hash + this.keys.hashCode();
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final AttributeReference other = (AttributeReference) obj;
        if (this.keys != other.keys && !this.keys.equals(other.keys)) {
            return false;
        }
        return true;
    }

    public static class Builder {

        private final List<Key<?>> keys;

        public Builder() {
            keys = Lists.newArrayList();
        }

        public Builder addObjectKeyAsFirst(String key) {
            keys.add(0, new ObjectKey(key));
            return this;
        }

        public Builder addArrayKeyAsFirst(int key) {
            keys.add(0, new ArrayKey(key));
            return this;
        }

        public Builder addObjectKey(String key) {
            keys.add(new ObjectKey(key));
            return this;
        }

        public Builder addArrayKey(int key) {
            keys.add(new ArrayKey(key));
            return this;
        }

        public AttributeReference build() {
            return new AttributeReference(ImmutableList.copyOf(keys));
        }
    }

    public static interface Key<K> extends Serializable {

        public String getTypeAsString();

        public K getKeyValue();
    }

    public static class ObjectKey implements Key<String>, Serializable {

        private static final long serialVersionUID = 1L;

        private final String key;

        public ObjectKey(String key) {
            this.key = key;
        }

        @Override
        public String getKeyValue() {
            return key;
        }

        public String getKey() {
            return key;
        }

        @Override
        public String toString() {
            return key;
        }

        @Override
        public String getTypeAsString() {
            return "object key";
        }

        @Override
        public int hashCode() {
            int hash = 7;
            hash = 23 * hash + (this.key != null ? this.key.hashCode() : 0);
            return hash;
        }

        @Override
        public boolean equals(Object obj) {
            if (obj == null) {
                return false;
            }
            if (getClass() != obj.getClass()) {
                return false;
            }
            final ObjectKey other = (ObjectKey) obj;
            if ((this.key == null) ? (other.key != null) : !this.key.equals(other.key)) {
                return false;
            }
            return true;
        }
    }

    public static class ArrayKey implements Key<Integer>, Serializable {

        private static final long serialVersionUID = 1L;

        private final int index;

        public ArrayKey(int index) {
            this.index = index;
        }

        public int getIndex() {
            return index;
        }

        @Override
        public Integer getKeyValue() {
            return index;
        }

        @Override
        public String toString() {
            return Integer.toString(index);
        }

        @Override
        public String getTypeAsString() {
            return "array key";
        }

        @Override
        public int hashCode() {
            int hash = 3;
            hash = 61 * hash + this.index;
            return hash;
        }

        @Override
        public boolean equals(Object obj) {
            if (obj == null) {
                return false;
            }
            if (getClass() != obj.getClass()) {
                return false;
            }
            final ArrayKey other = (ArrayKey) obj;
            if (this.index != other.index) {
                return false;
            }
            return true;
        }
    }
}