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A library for invoking native functions from java
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/*
 * Copyright (C) 2010 Wayne Meissner
 *
 * This file is part of the JNR project.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package jnr.ffi;

/**
 * A utility for allocating memory that can be passed to native functions.
 */
public final class Memory {

    private Memory() {
    }
    
    /**
     * Allocates a new block of java memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param size The size in bytes of memory to allocate.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocate(Runtime runtime, int size) {
        return runtime.getMemoryManager().allocate(size);
    }

    /**
     * Allocates a new block of java memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param type The native type to allocate memory for.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocate(Runtime runtime, NativeType type) {
        return runtime.getMemoryManager().allocate(runtime.findType(type).size());
    }

    /**
     * Allocates a new block of java memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param type The type to allocate memory for.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocate(Runtime runtime, Type type) {
        return runtime.getMemoryManager().allocate(type.size());
    }

    /**
     * Allocates a new block of java memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param type The type alias to allocate memory for.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocate(Runtime runtime, TypeAlias type) {
        return runtime.getMemoryManager().allocate(runtime.findType(type).size());
    }

    /**
     * Allocates a new block of native memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param size The size in bytes of memory to allocate.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateDirect(Runtime runtime, int size) {
        return runtime.getMemoryManager().allocateDirect(size);
    }

    /**
     * Allocates a new block of native memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param size The size in bytes of memory to allocate.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateDirect(Runtime runtime, long size) {
        return runtime.getMemoryManager().allocateDirect(size);
    }

    /**
     * Allocates a new block of native memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param type The native type to allocate memory for.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateDirect(Runtime runtime, NativeType type) {
        return runtime.getMemoryManager().allocateDirect(runtime.findType(type).size());
    }

    /**
     * Allocates a new block of native memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param type The type alias to allocate memory for.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateDirect(Runtime runtime, TypeAlias type) {
        return runtime.getMemoryManager().allocateDirect(runtime.findType(type).size());
    }

    /**
     * Allocates a new block of native memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param size The size in bytes of memory to allocate.
     * @param clear Whether the memory contents should be cleared, or left as
     * random data.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateDirect(Runtime runtime, int size, boolean clear) {
        return runtime.getMemoryManager().allocateDirect(size, clear);
    }

    /**
     * Allocates a new block of native memory and wraps it in a {@link Pointer}
     * accessor.
     *
     * @param runtime The current runtime.
     * @param size The size in bytes of memory to allocate.
     * @param clear Whether the memory contents should be cleared, or left as
     * random data.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateDirect(Runtime runtime, long size, boolean clear) {
        return runtime.getMemoryManager().allocateDirect(size, clear);
    }

    /**
     * Allocates a new block of transient native memory and wraps it in a {@link Pointer}
     * accessor.  The memory returned by this method should not be passed to native methods
     * that store the address for later use, as it may change each time it is passed to native code.
     *
     * @param runtime The current runtime.
     * @param type The native type to allocate memory for.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateTemporary(Runtime runtime, NativeType type) {
        return runtime.getMemoryManager().allocateTemporary(runtime.findType(type).size(), true);
    }

    /**
     * Allocates a new block of transient native memory and wraps it in a {@link Pointer}
     * accessor.  The memory returned by this method should not be passed to native methods
     * that store the address for later use, as it may change each time it is passed to native code.
     *
     * @param runtime The current runtime.
     * @param type The type alias to allocate memory for.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateTemporary(Runtime runtime, TypeAlias type) {
        return runtime.getMemoryManager().allocateTemporary(runtime.findType(type).size(), true);
    }
    
    /**
     * Allocates a new block of transient native memory and wraps it in a {@link Pointer}
     * accessor.  The memory returned by this method should not be passed to native methods
     * that store the address for later use, as it may change each time it is passed to native code.
     *
     * @param runtime The current runtime.
     * @param type The native type to allocate memory for.
     * @param clear Whether the memory contents should be cleared, or left as
     * random data.
     *
     * @return a {@code Pointer} instance that can access the memory.
     */
    public static Pointer allocateTemporary(Runtime runtime, NativeType type, boolean clear) {
        return runtime.getMemoryManager().allocateTemporary(runtime.findType(type).size(), clear);
    }
}