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The module for FunctionalJ Core.
There is a newer version: 1.0.17
// ============================================================================
// Copyright (c) 2017-2019 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
// 
// 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.
// ============================================================================
package functionalj.list;

import static functionalj.stream.ZipWithOption.AllowUnpaired;

import java.util.Collection;
import java.util.Objects;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Stream;

import functionalj.stream.StreamPlus;
import functionalj.stream.StreamPlus.Helper;
import functionalj.stream.Streamable;

@SuppressWarnings("javadoc")
public class FuncListDerived 
                implements FuncList {
    
    @SuppressWarnings("rawtypes")
    private static final Function noAction = Function.identity();
    
    private final Object                                 source;
    private final Function, Stream> action;
    
    public static  FuncListDerived from(FuncList funcList) {
        return new FuncListDerived<>(funcList);
    }
    @SuppressWarnings("unchecked")
    public static  FuncListDerived from(Supplier> supplier) {
        return new FuncListDerived<>(supplier, noAction);
    }
    @SuppressWarnings("unchecked")
    public static  FuncListDerived from(Streamable streamable) {
        return new FuncListDerived<>(streamable, noAction);
    }
    
    @SuppressWarnings("unchecked")
    public static  FuncListDerived from(Collection streamable) {
        return new FuncListDerived<>(streamable, noAction);
    }
    
    public FuncListDerived(Iterable collection, Function, Stream> action) {
        this.action = Objects.requireNonNull(action);
        this.source = collection;
    }
    public FuncListDerived(Supplier> streamSupplier, Function, Stream> action) {
        this.action = Objects.requireNonNull(action);
        this.source = streamSupplier;
    }
    public FuncListDerived(Streamable streamable, Function, Stream> action) {
        this.action = Objects.requireNonNull(action);
        this.source = streamable;
    }
    public FuncListDerived(ReadOnlyList readOnlyList, Function, Stream> action) {
        this.action = Objects.requireNonNull(action);
        this.source = readOnlyList;
    }
    public FuncListDerived(FuncList abstractFuncList, Function, Stream> action) {
        this.action = Objects.requireNonNull(action);
        this.source = abstractFuncList;
    }
    @SuppressWarnings("unchecked")
    public FuncListDerived(FuncList abstractFuncList) {
        this.action = s -> (Stream)s;
        this.source = abstractFuncList;
    }
    
    @SuppressWarnings({ "unchecked", "rawtypes" })
    private Stream getSourceStream() {
        if (source == null)
            return Stream.empty();
        if (source instanceof Supplier)
            return (Stream)((Supplier)source).get();
        if (source instanceof Streamable)
            return (Stream)((Streamable)source).stream();
        if (source instanceof Collection)
            return ((Collection)source).stream();
        throw new IllegalStateException();
    }
    
    @Override
    public StreamPlus stream() {
        Stream theStream = getSourceStream();
        Stream   newStream = action.apply(theStream);
        return StreamPlus.from(newStream);
    }
    
    public boolean isLazy() {
        return true;
    }
    
    public boolean isEager() {
        return false;
    }
    
    public FuncList lazy() {
        return this;
    }
    public FuncList eager() {
        return new ImmutableList(this, false);
    }
    
    @Override
    public ImmutableList toImmutableList() {
        return new ImmutableList(this);
    }
    
    @Override
    public int hashCode() {
        return Helper.hashCode(this.stream());
    }
    
    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public boolean equals(Object o) {
        if ((o instanceof Collection))
            return false;
        
        return combine(((Collection)o).stream(), AllowUnpaired, Objects::equals)
                .findFirst(Boolean.TRUE::equals)
                .isPresent();
    }
    
    @Override
    public String toString() {
        return Helper.toString(this.stream());
    }
    
}