/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

/*

 *******************************************************************************

 *   Copyright (C) 2009-2014, International Business Machines

 *   Corporation and others.  All Rights Reserved.

 *******************************************************************************

 */

package sun.text.normalizer;

import java.io.IOException;

final class Norm2AllModes {

    // Public API dispatch via Normalizer2 subclasses -------------------------- ***

    // Normalizer2 implementation for the old UNORM_NONE.

    public static final class NoopNormalizer2 extends Normalizer2 {

        @Override

        public StringBuilder normalize(CharSequence src, StringBuilder dest) {

            if(dest!=src) {

                dest.setLength(0);

                return dest.append(src);

            } else {

                throw new IllegalArgumentException();

            }

        }

        @Override

        public Appendable normalize(CharSequence src, Appendable dest) {

            if(dest!=src) {

                try {

                    return dest.append(src);

                } catch(IOException e) {

                    throw new InternalError(e.toString(), e);

                }

            } else {

                throw new IllegalArgumentException();

            }

        }

        @Override

        public StringBuilder normalizeSecondAndAppend(StringBuilder first, CharSequence second) {

            if(first!=second) {

                return first.append(second);

            } else {

                throw new IllegalArgumentException();

            }

        }

        @Override

        public StringBuilder append(StringBuilder first, CharSequence second) {

            if(first!=second) {

                return first.append(second);

            } else {

                throw new IllegalArgumentException();

            }

        }

        @Override

        public String getDecomposition(int c) {

            return null;

        }

        // No need to override the default getRawDecomposition().

        @Override

        public boolean isNormalized(CharSequence s) { return true; }

        @Override

        public int spanQuickCheckYes(CharSequence s) { return s.length(); }

        @Override

        public boolean hasBoundaryBefore(int c) { return true; }

    }

    // Intermediate class:

    // Has NormalizerImpl and does boilerplate argument checking and setup.

        public Normalizer2WithImpl(NormalizerImpl ni) {

            impl=ni;

        }

        // normalize

        @Override

        public StringBuilder normalize(CharSequence src, StringBuilder dest) {

            if(dest==src) {

                throw new IllegalArgumentException();

            }

            dest.setLength(0);

            normalize(src, new NormalizerImpl.ReorderingBuffer(impl, dest, src.length()));

            return dest;

        }

        @Override

        public Appendable normalize(CharSequence src, Appendable dest) {

            if(dest==src) {

                throw new IllegalArgumentException();

            }

            NormalizerImpl.ReorderingBuffer buffer=

                new NormalizerImpl.ReorderingBuffer(impl, dest, src.length());

            normalize(src, buffer);

            buffer.flush();

            return dest;

        }

        protected abstract void normalize(CharSequence src, NormalizerImpl.ReorderingBuffer buffer);

        // normalize and append

        @Override

        public StringBuilder normalizeSecondAndAppend(StringBuilder first, CharSequence second) {

            return normalizeSecondAndAppend(first, second, true);

        }

        @Override

        public StringBuilder append(StringBuilder first, CharSequence second) {

            return normalizeSecondAndAppend(first, second, false);

        }

        public StringBuilder normalizeSecondAndAppend(

                StringBuilder first, CharSequence second, boolean doNormalize) {

            if(first==second) {

                throw new IllegalArgumentException();

            }

            normalizeAndAppend(

                second, doNormalize,

                new NormalizerImpl.ReorderingBuffer(impl, first, first.length()+second.length()));

            return first;

        }

        protected abstract void normalizeAndAppend(

                CharSequence src, boolean doNormalize, NormalizerImpl.ReorderingBuffer buffer);

        @Override

        public String getDecomposition(int c) {

            return impl.getDecomposition(c);

        }

        @Override

        public int getCombiningClass(int c) {

            return impl.getCC(impl.getNorm16(c));

        }

        // quick checks

        @Override

        public boolean isNormalized(CharSequence s) {

            return s.length()==spanQuickCheckYes(s);

        }

        public final NormalizerImpl impl;

    }

    public static final class DecomposeNormalizer2 extends Normalizer2WithImpl {

        public DecomposeNormalizer2(NormalizerImpl ni) {

            super(ni);

        }

        @Override

        protected void normalize(CharSequence src, NormalizerImpl.ReorderingBuffer buffer) {

            impl.decompose(src, 0, src.length(), buffer);

        }

        @Override

        protected void normalizeAndAppend(

                CharSequence src, boolean doNormalize, NormalizerImpl.ReorderingBuffer buffer) {

            impl.decomposeAndAppend(src, doNormalize, buffer);

        }

        @Override

        public int spanQuickCheckYes(CharSequence s) {

            return impl.decompose(s, 0, s.length(), null);

        }

        @Override

        public boolean hasBoundaryBefore(int c) { return impl.hasDecompBoundary(c, true); }

    }

    public static final class ComposeNormalizer2 extends Normalizer2WithImpl {

        public ComposeNormalizer2(NormalizerImpl ni, boolean fcc) {

            super(ni);

            onlyContiguous=fcc;

        }

        @Override

        protected void normalize(CharSequence src, NormalizerImpl.ReorderingBuffer buffer) {

            impl.compose(src, 0, src.length(), onlyContiguous, true, buffer);

        }

        @Override

        protected void normalizeAndAppend(

                CharSequence src, boolean doNormalize, NormalizerImpl.ReorderingBuffer buffer) {

            impl.composeAndAppend(src, doNormalize, onlyContiguous, buffer);

        }

        @Override

        public boolean isNormalized(CharSequence s) {

            // 5: small destCapacity for substring normalization

            return impl.compose(s, 0, s.length(),

                                onlyContiguous, false,

                                new NormalizerImpl.ReorderingBuffer(impl, new StringBuilder(), 5));

        }

        @Override

        public int spanQuickCheckYes(CharSequence s) {

            return impl.composeQuickCheck(s, 0, s.length(), onlyContiguous, true)>>>1;

        }

        @Override

        public boolean hasBoundaryBefore(int c) { return impl.hasCompBoundaryBefore(c); }

        private final boolean onlyContiguous;

    }

    // instance cache ---------------------------------------------------------- ***

    private Norm2AllModes(NormalizerImpl ni) {

        impl=ni;

        comp=new ComposeNormalizer2(ni, false);

        decomp=new DecomposeNormalizer2(ni);

    }

    public final NormalizerImpl impl;

    public final ComposeNormalizer2 comp;

    public final DecomposeNormalizer2 decomp;

    private static Norm2AllModes getInstanceFromSingleton(Norm2AllModesSingleton singleton) {

        if(singleton.exception!=null) {

            throw singleton.exception;

        }

        return singleton.allModes;

    }

    public static Norm2AllModes getNFCInstance() {

        return getInstanceFromSingleton(NFCSingleton.INSTANCE);

    }

    public static Norm2AllModes getNFKCInstance() {

        return getInstanceFromSingleton(NFKCSingleton.INSTANCE);

    }

    public static final NoopNormalizer2 NOOP_NORMALIZER2=new NoopNormalizer2();

    private static final class Norm2AllModesSingleton {

        private Norm2AllModesSingleton(String name) {

            try {

                String DATA_FILE_NAME = "/sun/text/resources/" + name + ".icu";

                NormalizerImpl impl=new NormalizerImpl().load(DATA_FILE_NAME);

                allModes=new Norm2AllModes(impl);

            } catch (RuntimeException e) {

                exception=e;

            }

        }

        private Norm2AllModes allModes;

        private RuntimeException exception;

    }

    private static final class NFCSingleton {

        private static final Norm2AllModesSingleton INSTANCE=new Norm2AllModesSingleton("nfc");

    }

    private static final class NFKCSingleton {

        private static final Norm2AllModesSingleton INSTANCE=new Norm2AllModesSingleton("nfkc");

    }

}